小学生四则运算APP核心代码公布

Mainactivity类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import android.os.Bundle;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.Context;

import android.content.Intent;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.EditText;

import android.widget.TextView;

public class MainActivity extends Activity {

    public static final String FILENAME = "setting.set";

    public static final String FILENAME1 = "mima.set";

    public static final String FILENAME0 = "zancun.set";

    private EditText et;

    private EditText et1;

    private EditText et2;

    TextView text;

    String c;

    OnClickListener listener1 = null;//监听器初始化

    OnClickListener listener2 = null;

    OnClickListener listener3 = null;

    OnClickListener listener4 = null;

    String a;

    String b;

    Button button1;//定义按钮

    TextView textView;

    TextView textView1;

    CheckBox CheckBox;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        text=(TextView) findViewById(R.id.editText3);

        b=readFiles0();

        text.setText(b);

        //登录

        listener1 = new OnClickListener() {

            public void onClick(View v) {

                et=(EditText)findViewById(R.id.editText2);

                et1=(EditText)findViewById(R.id.editText3);

                c=readFiles1();

                a=readFiles();

                if(et.getText().toString().equals(c) && et1.getText().toString().equals(a)){

                     /*AlertDialog.Builder builder  = new Builder(MainActivity.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("密码输入正确！！" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     */

                     et.setText("");

                     Intent intent = new Intent(MainActivity.this, onectivity.class);

                     startActivity(intent);

                     //builder.show();

                      }

                else{

                     AlertDialog.Builder builder  = new Builder(MainActivity.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("密码错误！请重新输入！") ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     et.setText("");

                }

            }

        };

        //注册

        listener2 = new OnClickListener() {

            public void onClick(View v) {

                setTitle("注册");

                Intent intent1 = new Intent(MainActivity.this, zhuce.class);

                startActivity(intent1);

            }

        };

        //忘记密码

        listener3 = new OnClickListener() {

            public void onClick(View v) {

                 a=readFiles();

                 AlertDialog.Builder builder  = new Builder(MainActivity.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("请联系客服光大大设计者拿回密码！") ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 //et.setText("");

            }

        };

        //记住我

        listener4 = new OnClickListener() {

            public void onClick(View v) {

                et2=(EditText)findViewById(R.id.editText3);

                writeFiles0(et2.getText().toString());

            }

        };

        setContentView(R.layout.activity_main);

        button1 = (Button) findViewById(R.id.denglu);

        button1.setOnClickListener(listener1);

        textView = (TextView) findViewById(R.id.zhuce);

        textView.setOnClickListener(listener2);

        textView1 = (TextView) findViewById(R.id.wangji);

        textView1.setOnClickListener(listener3);

        CheckBox = (CheckBox) findViewById(R.id.jizhu);

        CheckBox.setOnClickListener(listener4);

    }

    // 保存文件暂时保存账号内容

    private void writeFiles0(String content) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos0 = openFileOutput(FILENAME0,

                    Context.MODE_PRIVATE);

            fos0.write(content.getBytes());

            fos0.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

    // 读取文件内容

    private String readFiles0() {

        String content = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME0);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[];

            int len = ;

            while ((len = fis.read(buffer)) != -) {

                baos.write(buffer, , len);

            }

            content = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content;

    }  

    // 读取文件内容

    private String readFiles() {

        String content = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[];

            int len = ;

            while ((len = fis.read(buffer)) != -) {

                baos.write(buffer, , len);

            }

            content = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content;

    }  

 // 读取文件内容

    private String readFiles1() {

        String content1 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME1);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[];

            int len = ;

            while ((len = fis.read(buffer)) != -) {

                baos.write(buffer, , len);

            }

            content1 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content1;

    }

}

注册类：

package com.example.XXSCYS;  

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class zhuce extends Activity{

    private EditText zhanghao;

    private EditText mima;

    private EditText QRmima;

    private EditText nicheng;

    private Button Btn;

    private int dengji=0;

    private int money=100;

    private int daoju=0;

    //private TextView contentView;

    String xinxi;

    public static final String FILENAME = "setting.set";

    public static final String FILENAME1 = "mima.set";

    public static final String FILENAME2 = "xinxi.set";

    public static final String FILENAME3 = "dengji.set";

    public static final String FILENAME4 = "money.set";

    public static final String FILENAME5 = "daoju.set";

    OnClickListener listener1 = null;//监听器初始化

    EditText editText;

    @SuppressLint("CutPasteId") @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.zhuce);

        zhanghao = (EditText) findViewById(R.id.editText1);

        mima = (EditText) findViewById(R.id.editText2);

        QRmima = (EditText) findViewById(R.id.editText3);

        nicheng = (EditText) findViewById(R.id.editText4);

        Btn = (Button) findViewById(R.id.button1);     

       // contentView = (TextView) findViewById(R.id.contentview);

        Btn.setOnClickListener(new OperateOnClickListener());

           }  

    class OperateOnClickListener implements OnClickListener {

        @Override

        public void onClick(View v) {

             writeFiles(zhanghao.getText().toString());

             writeFiles1(mima.getText().toString());

             //writeFiles(QRmima.getText().toString());

             writeFiles2(nicheng.getText().toString());

             writeFiles3(""+dengji);

             writeFiles4(""+money);

             writeFiles5(""+daoju);

             xinxi=readFiles2();

                     if(mima.getText().toString().equals(QRmima.getText().toString())){

                         AlertDialog.Builder builder  = new Builder(zhuce.this);

                          builder.setTitle("注册成功" ) ;

                          builder.setMessage("昵称"+xinxi+"\n"+"等级"+dengji+"\n"+"金币"+money ) ;

                          builder.setPositiveButton("确定" ,  null );

                          builder.show();

                          zhanghao.setText("");

                          mima.setText("");

                          QRmima.setText("");

                          nicheng.setText("");

                         System.out.println(getFilesDir());

                         zhuce.this.finish();

                     }

                     else{

                          AlertDialog.Builder builder  = new Builder(zhuce.this);

                          builder.setTitle("信息提醒" ) ;

                          builder.setMessage("密码确认不符！请重新输入！") ;

                          builder.setPositiveButton("确定" ,  null );

                          builder.show();

                          mima.setText("");

                          QRmima.setText("");

                     }                      

        }

    }

    // 保存文件内容(账号)

    private void writeFiles(String content) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos = openFileOutput(FILENAME,

                    Context.MODE_PRIVATE);

            fos.write(content.getBytes());

            fos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

 // 保存文件内容 (密码)

    private void writeFiles1(String content1) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos1 = openFileOutput(FILENAME1,

                    Context.MODE_PRIVATE);

            fos1.write(content1.getBytes());

            fos1.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

 // 保存文件内容  (昵称)

    private void writeFiles2(String content2) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos2 = openFileOutput(FILENAME2,

                    Context.MODE_PRIVATE);

            fos2.write(content2.getBytes());

            fos2.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

 // 保存文件内容  （等级）

    private void writeFiles3(String content3) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos3 = openFileOutput(FILENAME3,

                    Context.MODE_PRIVATE);

            fos3.write(content3.getBytes());

            fos3.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

 // 保存文件内容  （金币）

    private void writeFiles4(String content4) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos4 = openFileOutput(FILENAME4,

                    Context.MODE_PRIVATE);

            fos4.write(content4.getBytes());

            fos4.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    // 读取昵称

    private String readFiles2() {

        String content2 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME2);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content2 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content2;

    }

 // 保存文件内容

    private void writeFiles5(String content5) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos5 = openFileOutput(FILENAME5,

                    Context.MODE_PRIVATE);

            fos5.write(content5.getBytes());

            fos5.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

}

登陆类（启动页面）：

package com.example.XXSCYS;

import android.annotation.SuppressLint;

import android.app.TabActivity;

import android.content.Intent;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.view.View;

import android.view.Window;

import android.widget.Button;

import android.widget.PopupMenu;

import android.widget.RadioGroup;

import android.widget.TabHost;

import android.widget.RadioGroup.OnCheckedChangeListener;

public class onectivity extends  TabActivity implements OnCheckedChangeListener{

        private RadioGroup mainTab;

        private TabHost tabhost;

        private Intent a;

        private Intent xinxi;

        private Intent shangcheng;

        @SuppressLint("NewApi") @Override

        public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            requestWindowFeature(Window.FEATURE_NO_TITLE);

            setContentView(R.layout.onectivity);

            final Button btn=(Button)findViewById(R.id.dati);

            final PopupMenu popupMenu=new PopupMenu(this, btn);

            popupMenu.inflate(R.menu.main);    

            btn.setOnClickListener(new View.OnClickListener() {

                @Override

                public void onClick(View arg0) {

                    // TODO Auto-generated method stub

                    popupMenu.show();

                }

            });

          //菜单单击响应

            popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener(){

               @Override

               public  boolean onMenuItemClick(MenuItem item){

                   switch(item.getItemId()){

                   case R.id.jiafa:

                        setTitle("加法");

                    Intent intent1 = new Intent(onectivity.this, jiafa.class);

                    startActivity(intent1);

                       break;

                   case R.id.jianfa:

                       setTitle("减法");

                    Intent intent2 = new Intent(onectivity.this, jianfa.class);

                    startActivity(intent2);

                       break;

                   case R.id.chengfa:

                       setTitle("乘法");

                    Intent intent3 = new Intent(onectivity.this, chengfa.class);

                    startActivity(intent3);

                       break;

                   case R.id.chufa:

                       setTitle("除法");

                    Intent intent4 = new Intent(onectivity.this, chufa.class);

                    startActivity(intent4);

                       break;

                   case R.id.hunhe:

                       setTitle("混合运算");

                    Intent intent5 = new Intent(onectivity.this, hunhe.class);

                    startActivity(intent5);

                       break;

                   }

                   return false;

            }

        });

            mainTab=(RadioGroup)findViewById(R.id.main_tab);

            mainTab.setOnCheckedChangeListener(this);

            tabhost = getTabHost();

            a= new Intent(this, a.class);

            tabhost.addTab(tabhost.newTabSpec("a")

                    .setIndicator(getResources().getString(R.string.xinxi), getResources().getDrawable(R.drawable.xinxi))

                    .setContent(a));

            xinxi= new Intent(this, xinxi.class);

            tabhost.addTab(tabhost.newTabSpec("xinxi")

                    .setIndicator(getResources().getString(R.string.xinxi), getResources().getDrawable(R.drawable.xinxi))

                    .setContent(xinxi));

            shangcheng = new Intent(this,shangcheng.class);

            tabhost.addTab(tabhost.newTabSpec("shangcheng")

                    .setIndicator(getResources().getString(R.string.shangcheng), getResources().getDrawable(R.drawable.shangcheng))

                    .setContent(shangcheng));

        }

     @Override

        public void onCheckedChanged(RadioGroup group, int checkedId) {

            switch(checkedId){

            case R.id.xinxi:

                this.tabhost.setCurrentTabByTag("xinxi");

                break;

            case R.id.shangcheng:

                this.tabhost.setCurrentTabByTag("shangcheng");

                break;

            case R.id.tuichu:

                onectivity.this.finish();

                break;

            }

        }  

}

加法类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class jiafa extends Activity {

    public static final String FILENAME3 = "dengji.set";

    public static final String FILENAME4 = "money.set";

    public static final String FILENAME5 = "daoju.set";

    private int money;

    private float dengji;

    private int daoju;

    private EditText et;

    TextView text;

    OnClickListener listener1 = null;//监听器初始化

    OnClickListener listener2 = null;

    OnClickListener listener3 = null;

    OnClickListener listener4 = null;

    Button button1;//定义按钮

    Button button2;

    Button button3;

    Button button4;

    double c;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);;

        setContentView(R.layout.jiafa);

        listener1 = new OnClickListener() {

            public void onClick(View v) {

                int a=(int)(Math.random()*(-5))+10;

                int b=(int)(Math.random()*(-5))+20;

                 text=(TextView) findViewById(R.id.editText3);

                 text.setText(a+"+"+b+"=?");

                 c=a+b;

            }

     };

     listener2 = new OnClickListener() {

            public void onClick(View v) {

                String m;

                String n;

                m=readFiles4();

                 n=readFiles3();

                 final int i = Integer.parseInt(m);

                 final float j = Float.parseFloat(n);

            et=(EditText)findViewById(R.id.editText2);

            if(Integer.parseInt(et.getText().toString())==c){

                 AlertDialog.Builder builder  = new Builder(jiafa.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("恭喜啦，回答正确！！" ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i+10;

                 dengji=(float) (j+0.1);

                  }

            else{

                AlertDialog.Builder builder  = new Builder(jiafa.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+c ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i-5;

            }

            writeFiles4(""+money);

             writeFiles3(""+dengji);

        }

     };

     listener3 = new OnClickListener() {

            public void onClick(View v) {

                int a=(int)(Math.random()*(-5))+10;

                int b=(int)(Math.random()*(-5))+20;

                 text=(TextView) findViewById(R.id.editText3);

                 text.setText(a+"+"+b+"=?");

                 c=a+b;

            }

     };

     listener4 = new OnClickListener() {

            public void onClick(View v) {

                 String o;

                 o=readFiles5();

                 final int p = Integer.parseInt(o);

                 if(o.equals("0")) {

                     AlertDialog.Builder builder  = new Builder(jiafa.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     }

                 else{

                     AlertDialog.Builder builder  = new Builder(jiafa.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("正确答案为："+c+"\n"+"您用掉了一个道具" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     daoju=p-1;

                     writeFiles5(""+daoju);

                     }

            }

     };

     setContentView(R.layout.jiafa);

        button1 = (Button) findViewById(R.id.start);

        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);

        button2.setOnClickListener(listener2);

        button3 = (Button) findViewById(R.id.next);

        button3.setOnClickListener(listener3);

        button4 = (Button) findViewById(R.id.daoju);

        button4.setOnClickListener(listener4);

    }

    // 读取等级

    private String readFiles3() {

        String content3 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME3);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content3 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content3;

    }

 // 保存文件内容

    private void writeFiles3(String content3) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos3 = openFileOutput(FILENAME3,

                    Context.MODE_PRIVATE);

            fos3.write(content3.getBytes());

            fos3.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

    // 读取金币

    private String readFiles4() {

        String content4 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME4);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content4 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content4;

    }

 // 保存文件内容

    private void writeFiles4(String content4) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos4 = openFileOutput(FILENAME4,

                    Context.MODE_PRIVATE);

            fos4.write(content4.getBytes());

            fos4.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

 // 读取道具数

    private String readFiles5() {

        String content5 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME5);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content5 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content5;

    }

 // 保存文件内容

    private void writeFiles5(String content5) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos5 = openFileOutput(FILENAME5,

                    Context.MODE_PRIVATE);

            fos5.write(content5.getBytes());

            fos5.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

减法类:

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class jianfa extends Activity {

    public static final String FILENAME3 = "dengji.set";

    public static final String FILENAME4 = "money.set";

    public static final String FILENAME5 = "daoju.set";

    private int money;

    private float dengji;

    private int daoju;

    private EditText et;

    TextView text;

    OnClickListener listener1 = null;//监听器初始化

    OnClickListener listener2 = null;

    OnClickListener listener3 = null;

    OnClickListener listener4 = null;

    Button button1;//定义按钮

    Button button2;

    Button button3;

    Button button4;

    double c;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);;

        setContentView(R.layout.jiafa);

        listener1 = new OnClickListener() {

            public void onClick(View v) {

                int a=(int)(Math.random()*(-5))+20;

                int b=(int)(Math.random()*(-5))+10;

                 text=(TextView) findViewById(R.id.editText3);

                 text.setText(a+"-"+b+"=?");

                 c=a-b;

            }

     };

     listener2 = new OnClickListener() {

            public void onClick(View v) {

                String m;

                String n;

                m=readFiles4();

                 n=readFiles3();

                 final int i = Integer.parseInt(m);

                 final float j = Float.parseFloat(n);

            et=(EditText)findViewById(R.id.editText2);

            if(Integer.parseInt(et.getText().toString())==c){

                 AlertDialog.Builder builder  = new Builder(jianfa.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("恭喜啦，回答正确！！" ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i+10;

                 dengji=(float) (j+0.1);

                  }

            else{

                AlertDialog.Builder builder  = new Builder(jianfa.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+c ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i-5;

            }

            writeFiles4(""+money);

             writeFiles3(""+dengji);

        }

     };

     listener3 = new OnClickListener() {

            public void onClick(View v) {

                int a=(int)(Math.random()*(-5))+20;

                int b=(int)(Math.random()*(-5))+10;

                 text=(TextView) findViewById(R.id.editText3);

                 text.setText(a+"-"+b+"=?");

                 c=a-b;

            }

     };

     listener4 = new OnClickListener() {

            public void onClick(View v) {

                 String o;

                 o=readFiles5();

                 final int p = Integer.parseInt(o);

                 if(o.equals("0")) {

                     AlertDialog.Builder builder  = new Builder(jianfa.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     }

                 else{

                     AlertDialog.Builder builder  = new Builder(jianfa.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("正确答案为："+c+"\n"+"您用掉了一个道具" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     daoju=p-1;

                     writeFiles5(""+daoju);

                     }

            }

     };

     setContentView(R.layout.jiafa);

        button1 = (Button) findViewById(R.id.start);

        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);

        button2.setOnClickListener(listener2);

        button3 = (Button) findViewById(R.id.next);

        button3.setOnClickListener(listener3);

        button4 = (Button) findViewById(R.id.daoju);

        button4.setOnClickListener(listener4);

    }

    // 读取等级

    private String readFiles3() {

        String content3 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME3);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content3 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content3;

    }

 // 保存文件内容

    private void writeFiles3(String content3) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos3 = openFileOutput(FILENAME3,

                    Context.MODE_PRIVATE);

            fos3.write(content3.getBytes());

            fos3.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

    // 读取金币

    private String readFiles4() {

        String content4 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME4);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content4 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content4;

    }

 // 保存文件内容

    private void writeFiles4(String content4) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos4 = openFileOutput(FILENAME4,

                    Context.MODE_PRIVATE);

            fos4.write(content4.getBytes());

            fos4.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

 // 读取道具数

    private String readFiles5() {

        String content5 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME5);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content5 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content5;

    }

 // 保存文件内容

    private void writeFiles5(String content5) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos5 = openFileOutput(FILENAME5,

                    Context.MODE_PRIVATE);

            fos5.write(content5.getBytes());

            fos5.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

乘法类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class chengfa extends Activity {

    public static final String FILENAME3 = "dengji.set";

    public static final String FILENAME4 = "money.set";

    public static final String FILENAME5 = "daoju.set";

    private int money;

    private float dengji;

    private int daoju;

    private EditText et;

    TextView text;

    OnClickListener listener1 = null;//监听器初始化

    OnClickListener listener2 = null;

    OnClickListener listener3 = null;

    OnClickListener listener4 = null;

    Button button1;//定义按钮

    Button button2;

    Button button3;

    Button button4;

    double c;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);;

        setContentView(R.layout.jiafa);

        listener1 = new OnClickListener() {

            public void onClick(View v) {

                int a=(int)(Math.random()*(-5))+10;

                int b=(int)(Math.random()*(-5))+20;

                 text=(TextView) findViewById(R.id.editText3);

                 text.setText(a+"*"+b+"=?");

                 c=a*b;

            }

     };

     listener2 = new OnClickListener() {

            public void onClick(View v) {

                String m;

                String n;

                m=readFiles4();

                 n=readFiles3();

                 final int i = Integer.parseInt(m);

                 final float j = Float.parseFloat(n);

            et=(EditText)findViewById(R.id.editText2);

            if(Integer.parseInt(et.getText().toString())==c){

                 AlertDialog.Builder builder  = new Builder(chengfa.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("恭喜啦，回答正确！！" ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i+10;

                 dengji=(float) (j+0.1);

                  }

            else{

                AlertDialog.Builder builder  = new Builder(chengfa.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+c ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i-5;

            }

            writeFiles4(""+money);

             writeFiles3(""+dengji);

        }

     };

     listener3 = new OnClickListener() {

            public void onClick(View v) {

                int a=(int)(Math.random()*(-5))+10;

                int b=(int)(Math.random()*(-5))+20;

                 text=(TextView) findViewById(R.id.editText3);

                 text.setText(a+"*"+b+"=?");

                 c=a*b;

            }

     };

     listener4 = new OnClickListener() {

            public void onClick(View v) {

                 String o;

                 o=readFiles5();

                 final int p = Integer.parseInt(o);

                 if(o.equals("0")) {

                     AlertDialog.Builder builder  = new Builder(chengfa.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     }

                 else{

                     AlertDialog.Builder builder  = new Builder(chengfa.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("正确答案为："+c+"\n"+"您用掉了一个道具" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     daoju=p-1;

                     writeFiles5(""+daoju);

                     }

            }

     };

     setContentView(R.layout.jiafa);

        button1 = (Button) findViewById(R.id.start);

        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);

        button2.setOnClickListener(listener2);

        button3 = (Button) findViewById(R.id.next);

        button3.setOnClickListener(listener3);

        button4 = (Button) findViewById(R.id.daoju);

        button4.setOnClickListener(listener4);

    }

    // 读取等级

    private String readFiles3() {

        String content3 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME3);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content3 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content3;

    }

 // 保存文件内容

    private void writeFiles3(String content3) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos3 = openFileOutput(FILENAME3,

                    Context.MODE_PRIVATE);

            fos3.write(content3.getBytes());

            fos3.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

    // 读取金币

    private String readFiles4() {

        String content4 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME4);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content4 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content4;

    }

 // 保存文件内容

    private void writeFiles4(String content4) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos4 = openFileOutput(FILENAME4,

                    Context.MODE_PRIVATE);

            fos4.write(content4.getBytes());

            fos4.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

 // 读取道具数

    private String readFiles5() {

        String content5 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME5);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content5 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content5;

    }

 // 保存文件内容

    private void writeFiles5(String content5) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos5 = openFileOutput(FILENAME5,

                    Context.MODE_PRIVATE);

            fos5.write(content5.getBytes());

            fos5.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

除法类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class chufa extends Activity {

    public static final String FILENAME3 = "dengji.set";

    public static final String FILENAME4 = "money.set";

    public static final String FILENAME5 = "daoju.set";

    private int money;

    private float dengji;

    private int daoju;

    private EditText et;

    TextView text;

    OnClickListener listener1 = null;//监听器初始化

    OnClickListener listener2 = null;

    OnClickListener listener3 = null;

    OnClickListener listener4 = null;

    Button button1;//定义按钮

    Button button2;

    Button button3;

    Button button4;

    double c;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);;

        setContentView(R.layout.jiafa);

        listener1 = new OnClickListener() {

            public void onClick(View v) {

                int a=(int)(Math.random()*(-5))+20;

                int b=(int)(Math.random()*(-5))+10;

                 text=(TextView) findViewById(R.id.editText3);

                 text.setText(a+"/"+b+"=?");

                 c=a/b;

            }

     };

     listener2 = new OnClickListener() {

            public void onClick(View v) {

                String m;

                String n;

                m=readFiles4();

                 n=readFiles3();

                 final int i = Integer.parseInt(m);

                 final float j = Float.parseFloat(n);

            et=(EditText)findViewById(R.id.editText2);

            if(Integer.parseInt(et.getText().toString())==c){

                 AlertDialog.Builder builder  = new Builder(chufa.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("恭喜啦，回答正确！！" ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i+10;

                 dengji=(float) (j+0.1);

                  }

            else{

                AlertDialog.Builder builder  = new Builder(chufa.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+c ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i-5;

            }

            writeFiles4(""+money);

             writeFiles3(""+dengji);

        }

     };

     listener3 = new OnClickListener() {

            public void onClick(View v) {

                int a=(int)(Math.random()*(-5))+20;

                int b=(int)(Math.random()*(-5))+10;

                 text=(TextView) findViewById(R.id.editText3);

                 text.setText(a+"/"+b+"=?");

                 c=a/b;

            }

     };

     listener4 = new OnClickListener() {

            public void onClick(View v) {

                 String o;

                 o=readFiles5();

                 final int p = Integer.parseInt(o);

                 if(o.equals("0")) {

                     AlertDialog.Builder builder  = new Builder(chufa.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     }

                 else{

                     AlertDialog.Builder builder  = new Builder(chufa.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("正确答案为："+c+"\n"+"您用掉了一个道具" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     daoju=p-1;

                     writeFiles5(""+daoju);

                     }

            }

     };

     setContentView(R.layout.jiafa);

        button1 = (Button) findViewById(R.id.start);

        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);

        button2.setOnClickListener(listener2);

        button3 = (Button) findViewById(R.id.next);

        button3.setOnClickListener(listener3);

        button4 = (Button) findViewById(R.id.daoju);

        button4.setOnClickListener(listener4);

    }

    // 读取等级

    private String readFiles3() {

        String content3 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME3);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content3 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content3;

    }

 // 保存文件内容

    private void writeFiles3(String content3) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos3 = openFileOutput(FILENAME3,

                    Context.MODE_PRIVATE);

            fos3.write(content3.getBytes());

            fos3.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

    // 读取金币

    private String readFiles4() {

        String content4 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME4);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content4 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content4;

    }

 // 保存文件内容

    private void writeFiles4(String content4) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos4 = openFileOutput(FILENAME4,

                    Context.MODE_PRIVATE);

            fos4.write(content4.getBytes());

            fos4.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

 // 读取道具数

    private String readFiles5() {

        String content5 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME5);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content5 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content5;

    }

 // 保存文件内容

    private void writeFiles5(String content5) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos5 = openFileOutput(FILENAME5,

                    Context.MODE_PRIVATE);

            fos5.write(content5.getBytes());

            fos5.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

混合运算类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class hunhe extends Activity {

    public static final String FILENAME3 = "dengji.set";

    public static final String FILENAME4 = "money.set";

    public static final String FILENAME5 = "daoju.set";

    private int money;

    private float dengji;

    private int daoju;

    int a,x,y,o,p,j1,j2;

    float z,q,s1,s2,f,n;

    private EditText et;

    TextView text;

    OnClickListener listener1 = null;//监听器初始化

    OnClickListener listener2 = null;

    OnClickListener listener3 = null;

    OnClickListener listener4 = null;

    Button button1;//定义按钮

    Button button2;

    Button button3;

    Button button4;

    //double c;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);;

        setContentView(R.layout.jiafa);

        listener1 = new OnClickListener() {

            public void onClick(View v) {

                text=(TextView) findViewById(R.id.editText3);

                 x=(int)(1+Math.random()*100);

                 y=(int)(1+Math.random()*100);

                 o=(int)(1+Math.random()*100);

                 p=(int)(1+Math.random()*100);

                 a=(int)(1+Math.random()*16);

                 j1=x*y;

                 j2=o*p;

                 s1=x/y;

                 s2=o/p;

                switch (a) {

                case 1:

                    text.setText("("+x+"+"+y+")"+"*"+"("+o+"+"+p+")"+"=");

                    z=x+y;

                    q=o+p;

                    f=z*q;

                    break;

                case 2:

                    z=x-y;

                    if(z<0)

                    {text.setText("("+y+"-"+x+")"+"*"+"("+o+"+"+p+")"+"=");

                    z=-z;

                    }

                    else {

                        text.setText("("+x+"-"+y+")"+"*"+"("+o+"+"+p+")"+"=");

                    }

                    q=o+p;

                    f=z*q;

                    break;

                case 3:

                    z=x-y;

                    if(z>0)

                     text.setText("("+x+"-"+y+")"+"/"+"("+o+"+"+p+")"+"=");

                    else {

                         text.setText("("+y+"-"+x+")"+"/"+"("+o+"+"+p+")"+"=");

                         z=-z;

                    }

                    q=o+p;

                    f=q*z;

                    break;

                case 4:

                    text.setText("("+x+"+"+y+")"+"/"+"("+o+"+"+p+")"+"=");

                    f=(x+y)/(o+p);

                    break;

                case 5:

                    if(o==p)

                        o++;

                    z=x-y;

                    q=o-p;

                    if(z>0 && q>0)

                       text.setText("("+x+"-"+y+")"+"/"+"("+o+"-"+p+")"+"=");

                    if(z>0 && q<0)

                    {    text.setText("("+x+"-"+y+")"+"/"+"("+p+"-"+o+")"+"=");

                    q=-q;

                    }

                    if(z<0 && q>0)

                        {text.setText("("+y+"-"+x+")"+"/"+"("+o+"-"+p+")"+"=");

                        z=-z;

                        }

                    if(z<0 && q<0)

                    {    text.setText("("+y+"-"+x+")"+"/"+"("+p+"-"+o+")"+"=");

                       z=-z;

                       q=-q;

                    }

                    f=z/q;

                    break;

                case 6:

                    q=o-p;

                    z=x+y;

                    if(q>0)

                    text.setText("("+x+"+"+y+")"+"/"+"("+o+"-"+p+")"+"=");

                    else

                        {text.setText("("+x+"+"+y+")"+"/"+"("+p+"-"+o+")"+"=");

                        q=-q;

                        }

                    f=z/q;

                    break;

                case 7:

                    z=x-y;

                    q=o+p;

                    if(z>0)

                    text.setText("("+x+"-"+y+")"+"*"+"("+o+"+"+p+")"+"=");

                    else

                    {

                        text.setText("("+y+"-"+x+")"+"*"+"("+o+"+"+p+")"+"=");

                        z=-z;

                    }

                    f=z*q;

                    break;

                case 8:

                    q=o-p;

                    z=x+y;

                    if(q>0)

                    text.setText("("+x+"+"+y+")"+"*"+"("+o+"-"+p+")"+"=");

                    else

                    {

                        text.setText("("+x+"+"+y+")"+"*"+"("+o+"-"+p+")"+"=");

                        q=-q;

                    }

                    f=z*q;

                    break;

                case 9:

                    if(j1>j2)

                    {text.setText(x+"*"+y+"-"+o+"*"+p+"=");

                    f=j1-j2;

                    }

                    else

                        {

                        text.setText(o+"*"+p+"-"+x+"*"+y+"=");

                        f=j2-j1;

                        }

                    break;

                case 10:

                    if(j1>s2)

                        {

                        text.setText(x+"*"+y+"-"+o+"/"+p+"=");

                        f=j1-s2;

                        }

                    else

                        {

                        text.setText(o+"/"+p+"-"+x+"*"+y+"=");

                        f=s2-j1;

                        }

                    break;

                case 11:

                    if(s1>j2)

                    {

                        text.setText(x+"/"+y+"-"+o+"*"+p+"=");

                        f=s1-j2;

                    }

                    else

                        {

                        text.setText(o+"*"+p+"-"+x+"/"+y+"=");

                        f=j2-s1;

                        }

                    break;

                case 12:

                    f=s1-s2;

                    if(f>0)

                    {

                    text.setText(x+"/"+y+"-"+o+"/"+p+"=");

                    }

                    if(f<0)

                    {

                        text.setText(o+"/"+p+"-"+x+"/"+y+"=");

                        f=s2-s1;

                    }

                    break;

                case 13:

                    text.setText(x+"*"+y+"+"+o+"*"+p+"=");

                    f=j1+j2;

                    break;

                case 14:

                    text.setText(x+"*"+y+"+"+o+"/"+p+"=");

                    f=1+s2;

                    break;

                case 15:

                    text.setText(x+"/"+y+"+"+o+"*"+p+"=");

                    f=s1+j2;

                    break;

                case 16:

                    text.setText(x+"/"+y+"+"+o+"/"+p+"=");

                    f=s2+s1;

                    break;

                default:

                    break;

                }

            }

     };

     listener2 = new OnClickListener() {

            public void onClick(View v) {

                String m;

                String n;

                m=readFiles4();

                 n=readFiles3();

                 final int i = Integer.parseInt(m);

                 final float j = Float.parseFloat(n);

            et=(EditText)findViewById(R.id.editText2);

            if(Integer.parseInt(et.getText().toString())==f){

                 AlertDialog.Builder builder  = new Builder(hunhe.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("恭喜啦，回答正确！！" ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i+10;

                 dengji=(float) (j+0.1);

                  }

            else{

                AlertDialog.Builder builder  = new Builder(hunhe.this);

                 builder.setTitle("信息提醒" ) ;

                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+f ) ;

                 builder.setPositiveButton("确定" ,  null );

                 builder.show();

                 et.setText("");

                 text.setText("");

                 money=i-5;

            }

            writeFiles4(""+money);

             writeFiles3(""+dengji);

        }

     };

     listener3 = new OnClickListener() {

            public void onClick(View v) {

                text=(TextView) findViewById(R.id.editText3);

                x=(int)(1+Math.random()*100);

                 y=(int)(1+Math.random()*100);

                 o=(int)(1+Math.random()*100);

                 p=(int)(1+Math.random()*100);

                 a=(int)(1+Math.random()*16);

                 j1=x*y;

                 j2=o*p;

                 s1=x/y;

                 s2=o/p;

                switch (a) {

                case 1:

                    text.setText("("+x+"+"+y+")"+"*"+"("+o+"+"+p+")"+"=");

                    z=x+y;

                    q=o+p;

                    f=z*q;

                    break;

                case 2:

                    z=x-y;

                    if(z<0)

                    {text.setText("("+y+"-"+x+")"+"*"+"("+o+"+"+p+")"+"=");

                    z=-z;

                    }

                    else {

                        text.setText("("+x+"-"+y+")"+"*"+"("+o+"+"+p+")"+"=");

                    }

                    q=o+p;

                    f=z*q;

                    break;

                case 3:

                    z=x-y;

                    if(z>0)

                     text.setText("("+x+"-"+y+")"+"/"+"("+o+"+"+p+")"+"=");

                    else {

                         text.setText("("+y+"-"+x+")"+"/"+"("+o+"+"+p+")"+"=");

                         z=-z;

                    }

                    q=o+p;

                    f=q*z;

                    break;

                case 4:

                    text.setText("("+x+"+"+y+")"+"/"+"("+o+"+"+p+")"+"=");

                    f=(x+y)/(o+p);

                    break;

                case 5:

                    if(o==p)

                        o++;

                    z=x-y;

                    q=o-p;

                    if(z>0 && q>0)

                       text.setText("("+x+"-"+y+")"+"/"+"("+o+"-"+p+")"+"=");

                    if(z>0 && q<0)

                    {    text.setText("("+x+"-"+y+")"+"/"+"("+p+"-"+o+")"+"=");

                    q=-q;

                    }

                    if(z<0 && q>0)

                        {text.setText("("+y+"-"+x+")"+"/"+"("+o+"-"+p+")"+"=");

                        z=-z;

                        }

                    if(z<0 && q<0)

                    {    text.setText("("+y+"-"+x+")"+"/"+"("+p+"-"+o+")"+"=");

                       z=-z;

                       q=-q;

                    }

                    f=z/q;

                    break;

                case 6:

                    q=o-p;

                    z=x+y;

                    if(q>0)

                    text.setText("("+x+"+"+y+")"+"/"+"("+o+"-"+p+")"+"=");

                    else

                        {text.setText("("+x+"+"+y+")"+"/"+"("+p+"-"+o+")"+"=");

                        q=-q;

                        }

                    f=z/q;

                    break;

                case 7:

                    z=x-y;

                    q=o+p;

                    if(z>0)

                    text.setText("("+x+"-"+y+")"+"*"+"("+o+"+"+p+")"+"=");

                    else

                    {

                        text.setText("("+y+"-"+x+")"+"*"+"("+o+"+"+p+")"+"=");

                        z=-z;

                    }

                    f=z*q;

                    break;

                case 8:

                    q=o-p;

                    z=x+y;

                    if(q>0)

                    text.setText("("+x+"+"+y+")"+"*"+"("+o+"-"+p+")"+"=");

                    else

                    {

                        text.setText("("+x+"+"+y+")"+"*"+"("+o+"-"+p+")"+"=");

                        q=-q;

                    }

                    f=z*q;

                    break;

                case 9:

                    if(j1>j2)

                    {text.setText(x+"*"+y+"-"+o+"*"+p+"=");

                    f=j1-j2;

                    }

                    else

                        {

                        text.setText(o+"*"+p+"-"+x+"*"+y+"=");

                        f=j2-j1;

                        }

                    break;

                case 10:

                    if(j1>s2)

                        {

                        text.setText(x+"*"+y+"-"+o+"/"+p+"=");

                        f=j1-s2;

                        }

                    else

                        {

                        text.setText(o+"/"+p+"-"+x+"*"+y+"=");

                        f=s2-j1;

                        }

                    break;

                case 11:

                    if(s1>j2)

                    {

                        text.setText(x+"/"+y+"-"+o+"*"+p+"=");

                        f=s1-j2;

                    }

                    else

                        {

                        text.setText(o+"*"+p+"-"+x+"/"+y+"=");

                        f=j2-s1;

                        }

                    break;

                case 12:

                    f=s1-s2;

                    if(f>0)

                    {

                    text.setText(x+"/"+y+"-"+o+"/"+p+"=");

                    }

                    if(f<0)

                    {

                        text.setText(o+"/"+p+"-"+x+"/"+y+"=");

                        f=s2-s1;

                    }

                    break;

                case 13:

                    text.setText(x+"*"+y+"+"+o+"*"+p+"=");

                    f=j1+j2;

                    break;

                case 14:

                    text.setText(x+"*"+y+"+"+o+"/"+p+"=");

                    f=1+s2;

                    break;

                case 15:

                    text.setText(x+"/"+y+"+"+o+"*"+p+"=");

                    f=s1+j2;

                    break;

                case 16:

                    text.setText(x+"/"+y+"+"+o+"/"+p+"=");

                    f=s2+s1;

                    break;

                default:

                    break;

                }

            }

     };

     listener4 = new OnClickListener() {

            public void onClick(View v) {

                 String o;

                 o=readFiles5();

                 final int p = Integer.parseInt(o);

                 if(o.equals("0")) {

                     AlertDialog.Builder builder  = new Builder(hunhe.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     }

                 else{

                     AlertDialog.Builder builder  = new Builder(hunhe.this);

                     builder.setTitle("信息提醒" ) ;

                     builder.setMessage("正确答案为："+f+"\n"+"您用掉了一个道具" ) ;

                     builder.setPositiveButton("确定" ,  null );

                     builder.show();

                     daoju=p-1;

                     writeFiles5(""+daoju);

                     }

            }

     };

     setContentView(R.layout.jiafa);

        button1 = (Button) findViewById(R.id.start);

        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);

        button2.setOnClickListener(listener2);

        button3 = (Button) findViewById(R.id.next);

        button3.setOnClickListener(listener3);

        button4 = (Button) findViewById(R.id.daoju);

        button4.setOnClickListener(listener4);

    }

    // 读取等级

    private String readFiles3() {

        String content3 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME3);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content3 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content3;

    }

 // 保存文件内容

    private void writeFiles3(String content3) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos3 = openFileOutput(FILENAME3,

                    Context.MODE_PRIVATE);

            fos3.write(content3.getBytes());

            fos3.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }  

    // 读取金币

    private String readFiles4() {

        String content4 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME4);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content4 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content4;

    }

 // 保存文件内容

    private void writeFiles4(String content4) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos4 = openFileOutput(FILENAME4,

                    Context.MODE_PRIVATE);

            fos4.write(content4.getBytes());

            fos4.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

 // 读取道具数

    private String readFiles5() {

        String content5 = null ;

        try {

            FileInputStream fis = openFileInput(FILENAME5);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int len = 0;

            while ((len = fis.read(buffer)) != -1) {

                baos.write(buffer, 0, len);

            }

            content5 = baos.toString();

            fis.close();

            baos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return content5;

    }

 // 保存文件内容

    private void writeFiles5(String content5) {

        try {

            // 打开文件获取输出流，文件不存在则自动创建

            FileOutputStream fos5 = openFileOutput(FILENAME5,

                    Context.MODE_PRIVATE);

            fos5.write(content5.getBytes());

            fos5.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

商城类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import android.R.integer;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class shangcheng extends Activity{

    OnClickListener listener1 = null;

    Button button1;//定义按钮

    public static final String FILENAME4 = "money.set";

    public static final String FILENAME5 = "daoju.set";

    private int money;

    private int daoju;

    /** Called when the activity is first created. */

    @Override

     public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.shangcheng);    

            listener1 = new OnClickListener() {

                public void onClick(View v) {

                     String m;

                        String n;

                        m=readFiles4();

                         n=readFiles5();

                         final int i = Integer.parseInt(m);

                         final float j = Float.parseFloat(n);

                         if(i<=0){

                             AlertDialog.Builder builder  = new Builder(shangcheng.this);

                             builder.setTitle("信息提醒" ) ;

                             builder.setMessage("对不起，您的金币不足！！" ) ;

                             builder.setPositiveButton("确定" ,  null );

                             builder.show();

                         }

                         else{

                            money=i-50;

                            daoju=(int) (j+1);

                             writeFiles4(""+money);

                             writeFiles5(""+daoju);

                             AlertDialog.Builder builder  = new Builder(shangcheng.this);

                             builder.setTitle("信息提醒" ) ;

                             builder.setMessage("恭喜您，道具购买成功！" ) ;

                             builder.setPositiveButton("确定" ,  null );

                             builder.show();

                              }

                }

         };

           setContentView(R.layout.shangcheng);

            button1 = (Button) findViewById(R.id.button1);

            button1.setOnClickListener(listener1);

}

    // 读取金币

        private String readFiles4() {

            String content4 = null ;

            try {

                FileInputStream fis = openFileInput(FILENAME4);

                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                byte[] buffer = new byte[1024];

                int len = 0;

                while ((len = fis.read(buffer)) != -1) {

                    baos.write(buffer, 0, len);

                }

                content4 = baos.toString();

                fis.close();

                baos.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

            return content4;

        }

     // 保存文件内容

        private void writeFiles4(String content4) {

            try {

                // 打开文件获取输出流，文件不存在则自动创建

                FileOutputStream fos4 = openFileOutput(FILENAME4,

                        Context.MODE_PRIVATE);

                fos4.write(content4.getBytes());

                fos4.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

        }  

     // 读取道具数

        private String readFiles5() {

            String content5 = null ;

            try {

                FileInputStream fis = openFileInput(FILENAME5);

                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                byte[] buffer = new byte[1024];

                int len = 0;

                while ((len = fis.read(buffer)) != -1) {

                    baos.write(buffer, 0, len);

                }

                content5 = baos.toString();

                fis.close();

                baos.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

            return content5;

        }

     // 保存文件内容

        private void writeFiles5(String content5) {

            try {

                // 打开文件获取输出流，文件不存在则自动创建

                FileOutputStream fos5 = openFileOutput(FILENAME5,

                        Context.MODE_PRIVATE);

                fos5.write(content5.getBytes());

                fos5.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

}

用户信息类:

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import android.app.Activity;

import android.os.Bundle;

import android.widget.TextView;

public class xinxi extends Activity{

    TextView textView;

      public static final String FILENAME3 = "dengji.set";

      public static final String FILENAME4 = "money.set";

      public static final String FILENAME2 = "xinxi.set";

      public static final String FILENAME5 = "daoju.set";

      private String money;

      private String dengji;

      private String nicheng;

      private String daoju;

     protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.xinxi);

            nicheng=readFiles2();

            money=readFiles4();

            dengji=readFiles3();

            daoju=readFiles5();

            textView = (TextView) findViewById(R.id.textView1);

            textView.setText("昵称:"+nicheng+"\n"+"等级:"+dengji+"\n"+"金币:"+money+"\n"+"道具:"

            +daoju+"\n\n"+"温馨提示："+"\n"+"每答对一道题可获取10金币，等级提升0.1级，答错一题则扣5金币");

     }

    // 读取昵称

        private String readFiles2() {

            String content4 = null ;

            try {

                FileInputStream fis = openFileInput(FILENAME2);

                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                byte[] buffer = new byte[1024];

                int len = 0;

                while ((len = fis.read(buffer)) != -1) {

                    baos.write(buffer, 0, len);

                }

                content4 = baos.toString();

                fis.close();

                baos.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

            return content4;

        }  

    // 读取等级

        private String readFiles3() {

            String content4 = null ;

            try {

                FileInputStream fis = openFileInput(FILENAME3);

                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                byte[] buffer = new byte[1024];

                int len = 0;

                while ((len = fis.read(buffer)) != -1) {

                    baos.write(buffer, 0, len);

                }

                content4 = baos.toString();

                fis.close();

                baos.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

            return content4;

        }  

     // 读取金币

        private String readFiles4() {

            String content4 = null ;

            try {

                FileInputStream fis = openFileInput(FILENAME4);

                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                byte[] buffer = new byte[1024];

                int len = 0;

                while ((len = fis.read(buffer)) != -1) {

                    baos.write(buffer, 0, len);

                }

                content4 = baos.toString();

                fis.close();

                baos.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

            return content4;

        }

        // 读取道具数

        private String readFiles5() {

            String content5 = null ;

            try {

                FileInputStream fis = openFileInput(FILENAME5);

                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                byte[] buffer = new byte[1024];

                int len = 0;

                while ((len = fis.read(buffer)) != -1) {

                    baos.write(buffer, 0, len);

                }

                content5 = baos.toString();

                fis.close();

                baos.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

            return content5;

        }

}

附加类：

package com.example.XXSCYS;

import android.app.Activity;

import android.os.Bundle;

public class a extends Activity{

     protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.a);

     }

}

项目发布：

我们团队把整个项目文件上传到Github，链接地址：https://github.com/scarletcirno/students

app推广：

第一步：在QQ群和微信群里边，呼吁大家下载APP体验，但是效果比较差，下载量比较小，于是采用逐个逐个单独和同学沟通，认真听取他们的体验感受。

第二步：我们采用了人海战术，通过微信公众号来推广，找到一些微信公众号平台，比如：广商微生活。在底部菜单加上我们APP的下载链接，引导他们下载使用。

第三步：最后采用有针对性的推广，锁定用户人群，小学生的家长，于是找到各个同学的亲戚朋友，让他们下载APP体验，总结不足和优点。

总结：这推广过程中，我们也遇到了很多困难，但是，我们收获了很多，明白产品推广的不易之处，相信这份体验会给将来的学习和工作带来一点帮助。

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