程序有难度和单项练习，但设计了每次只出5到题，如果做错的话会把错题加入到数据库中，然后通多错题巩固选项可以对错题进行训练。

代码：

普通选项代码：

  1.  package com.example.szys;
  2.  
  3.  import java.math.*;
  4.  import java.util.Random;
  5.  
  6.  import android.app.Activity;
  7.  import android.app.AlertDialog;
  8.  import android.content.ContentValues;
  9.  import android.content.DialogInterface;
  10.  import android.content.Intent;
  11.  import android.database.Cursor;
  12.  import android.os.Bundle;
  13.  import android.view.View;
  14.  import android.widget.Button;
  15.  import android.widget.EditText;
  16.  import android.widget.TextView;
  17.  
  18.  public class CalActivity extends Activity {
  19.      int op;
  20.      int a;
  21.      int b;
  22.      int n=0;
  23.      int w=0;
  24.      String r;
  25.      Double answer,respon;
  26.      TextView textview1,textview2;
  27.      EditText editText;
  28.      Button button;
  29.       @Override
  30.       protected void onCreate(Bundle savedInstanceState) {
  31.           super.onCreate(savedInstanceState);
  32.           setContentView(R.layout.cal_main);
  33.           textview1=(TextView)findViewById(R.id.textView1);
  34.           textview2=(TextView)findViewById(R.id.textView2);
  35.           editText=(EditText)findViewById(R.id.EditText1);
  36.               a =new Random().nextInt(100);
  37.              b =new Random().nextInt(100);
  38.              op=new Random().nextInt(4);
  39.              switch(op)
  40.              {
  41.              case 0:
  42.                  textview1.setText(a+"+"+b+"=");
  43.                  answer=(double) (a+b);
  44.                  break;
  45.              case 1:
  46.                  textview1.setText(a+"-"+b+"=");
  47.                  answer=(double) (a-b);
  48.                  break;
  49.              case 2:
  50.                  a =new Random().nextInt(10);
  51.                  b =new Random().nextInt(10);
  52.                  textview1.setText(a+"*"+b+"=");
  53.                  answer=(double) (a*b);
  54.                  break;
  55.              case 3:
  56.                  a =new Random().nextInt(10);
  57.                  b =new Random().nextInt(10);
  58.                  while(b==0){
  59.                      b =new Random().nextInt(10);
  60.                  }
  61.                  textview1.setText(a+"/"+b+"=");
  62.                  BigDecimal   x   =   new   BigDecimal((double)a/b);
  63.                  answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
  64.  
  65.                  break;
  66.              }
  67.              button=(Button)findViewById(R.id.button4);
  68.              button.setOnClickListener(new Button.OnClickListener(){
  69.  
  70.                  @Override
  71.                  public void onClick(View arg0) {
  72.                      // TODO Auto-generated method stub
  73.                      if(!checkInteger(editText.getText().toString()))
  74.                      {
  75.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity.this);
  76.                          builder.setCancelable(false);
  77.                          builder.setTitle("错误");
  78.                          builder.setMessage("你输入的信息有错");
  79.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  80.  
  81.                              public void onClick(DialogInterface dialog, int whichButton) {  
  82.  
  83.                              }
  84.                          });
  85.                          builder.create().show();
  86.                          editText.setText("");
  87.                          return;
  88.                      }
  89.                      respon=Double.parseDouble(editText.getText().toString());
  90.                      r=textview1.getText().toString();
  91.                      ContentValues values = new ContentValues();
  92.                      values.put("problem", r);
  93.                      values.put("answer", answer);
  94.                      editText.setText("");
  95.                      n++;
  96.                      if(respon.equals(answer))
  97.                      {
  98.                          textview2.setText("你答对了！");
  99.                      }
  100.                      else{
  101.  
  102.                          DBHelper helper = new DBHelper(getApplicationContext());
  103.                          final Cursor c = helper.query();
  104.                          helper.insert(values);
  105.                          w++;
  106.                          textview2.setText("你答错了！\n"+r+answer);
  107.                          helper.close();
  108.                      }
  109.                      if(n<5)
  110.                      {
  111.                          a =new Random().nextInt(100);
  112.                          b =new Random().nextInt(100);
  113.                          op=new Random().nextInt(4);
  114.                          switch(op)
  115.                          {
  116.                          case 0:
  117.                              textview1.setText(a+"+"+b+"=");
  118.                              answer=(double) (a+b);
  119.                              break;
  120.                          case 1:
  121.                              textview1.setText(a+"-"+b+"=");
  122.                              answer=(double) (a-b);
  123.                              break;
  124.                          case 2:
  125.                              a =new Random().nextInt(10);
  126.                              b =new Random().nextInt(10);
  127.                              textview1.setText(a+"*"+b+"=");
  128.                              answer=(double) (a*b);
  129.                              break;
  130.                          case 3:
  131.                              a =new Random().nextInt(10);
  132.                              b =new Random().nextInt(10);
  133.                              while(b==0){
  134.                                  b =new Random().nextInt(10);
  135.                              }
  136.                              textview1.setText(a+"/"+b+"=");
  137.                              BigDecimal   x   =   new   BigDecimal((double)a/b);
  138.                              answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
  139.  
  140.                              break;
  141.                          }
  142.                      }
  143.                      else
  144.                      {
  145.                          int right=n-w;
  146.                          double rvate=(double)right/n*100;
  147.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity.this);
  148.                          builder.setCancelable(false);
  149.                          builder.setTitle("结束");
  150.                          builder.setMessage("你答对了"+right+"题"+"\n"+"答错了"+w+"题"+"\n"+"正确率为"+rvate+"%");
  151.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  152.  
  153.                              public void onClick(DialogInterface dialog, int whichButton) {
  154.                                  Intent intent = new Intent(CalActivity.this, MainActivity.class);
  155.                                  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  156.                                  startActivity(intent);
  157.                              }
  158.                          });
  159.                          builder.create().show();
  160.                      }
  161.                  }
  162.  
  163.              });
  164.  
  165.       }
  166.       public boolean checkInteger(String text) {
  167.           /*      当输入的文本去掉前后空格长度为0时返回false  */
  168.           if(text.trim().length()==0){
  169.                   return false;
  170.           }
  171.           try{
  172.                   Double.parseDouble(text);
  173.           }catch(Exception e){
  174.                   /*      无法转换为整数时返回false   */
  175.                   return false;
  176.           }
  177.           return true;
  178.   }
  179.  
  180.  }

CalActivity

困难选项代码：

  1.  package com.example.szys;
  2.  
  3.  import java.math.BigDecimal;
  4.  import java.util.Random;
  5.  
  6.  import android.app.Activity;
  7.  import android.app.AlertDialog;
  8.  import android.content.ContentValues;
  9.  import android.content.DialogInterface;
  10.  import android.content.Intent;
  11.  import android.database.Cursor;
  12.  import android.os.Bundle;
  13.  import android.view.View;
  14.  import android.widget.Button;
  15.  import android.widget.EditText;
  16.  import android.widget.TextView;
  17.  
  18.  public class CalActivity1 extends Activity{
  19.      int op;
  20.      int a;
  21.      int b;
  22.      int c;
  23.      int d;
  24.      int n=0;
  25.      int w=0;
  26.      String r;
  27.      Double answer,respon;
  28.      TextView textview1,textview2;
  29.      EditText editText;
  30.      Button button;
  31.       @Override
  32.       protected void onCreate(Bundle savedInstanceState) {
  33.           super.onCreate(savedInstanceState);
  34.           setContentView(R.layout.cal_main);
  35.           textview1=(TextView)findViewById(R.id.textView1);
  36.           textview2=(TextView)findViewById(R.id.textView2);
  37.           editText=(EditText)findViewById(R.id.EditText1);
  38.               a =new Random().nextInt(100);
  39.              b =new Random().nextInt(10);
  40.              c =new Random().nextInt(100);
  41.              d =new Random().nextInt(10);
  42.              op=new Random().nextInt(4);
  43.              switch(op)
  44.              {
  45.              case 0:
  46.                  while(d==0){
  47.                      d =new Random().nextInt(10);
  48.                  }
  49.                  textview1.setText("("+a+"+"+b+")"+"/"+d+"=");
  50.                  BigDecimal   x   =   new   BigDecimal((double) (a+b)/d);
  51.                  answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();
  52.                  break;
  53.              case 1:
  54.                  textview1.setText(d+"*"+a+"-"+b+"=");
  55.                  answer=(double) (d*a-b);
  56.                  break;
  57.              case 2:
  58.                  textview1.setText(a+"*"+b+"+"+c+"=");
  59.                  answer=(double) (a*b+c);
  60.                  break;
  61.              case 3:
  62.                  while(c==0){
  63.                      c =new Random().nextInt(100);
  64.                  }
  65.                  textview1.setText(a+"/"+c+"=");
  66.                  BigDecimal y  =   new   BigDecimal((double)a/c);
  67.                  answer  =   y.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
  68.  
  69.                  break;
  70.              }
  71.              button=(Button)findViewById(R.id.button4);
  72.              button.setOnClickListener(new Button.OnClickListener(){
  73.  
  74.                  @Override
  75.                  public void onClick(View arg0) {
  76.                      // TODO Auto-generated method stub
  77.                      if(!checkInteger(editText.getText().toString()))
  78.                      {
  79.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity1.this);
  80.                          builder.setCancelable(false);
  81.                          builder.setTitle("错误");
  82.                          builder.setMessage("你输入的信息有错");
  83.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  84.  
  85.                              public void onClick(DialogInterface dialog, int whichButton) {  
  86.  
  87.                              }
  88.                          });
  89.                          builder.create().show();
  90.                          editText.setText("");
  91.                          return;
  92.                      }
  93.                      respon=Double.parseDouble(editText.getText().toString());
  94.                      r=textview1.getText().toString();
  95.                      ContentValues values = new ContentValues();
  96.                      values.put("problem", r);
  97.                      values.put("answer", answer);
  98.                      editText.setText("");
  99.                      n++;
  100.                      if(respon.equals(answer))
  101.                      {
  102.                          textview2.setText("你答对了！");
  103.                      }
  104.                      else{
  105.                          DBHelper helper = new DBHelper(getApplicationContext());
  106.                          final Cursor c = helper.query();
  107.                          helper.insert(values);
  108.                          w++;
  109.                          textview2.setText("你答错了！\n"+r+answer);
  110.                          helper.close();
  111.                      }
  112.                      if(n<5)
  113.                      {
  114.                          a =new Random().nextInt(100);
  115.                          b =new Random().nextInt(100);
  116.                          op=new Random().nextInt(4);
  117.                          switch(op)
  118.                          {
  119.                          case 0:
  120.                              while(d==0){
  121.                                  d =new Random().nextInt(10);
  122.                              }
  123.                              textview1.setText("("+a+"+"+b+")"+"/"+d+"=");
  124.                              BigDecimal   x   =   new   BigDecimal((double) (a+b)/d);
  125.                              answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();
  126.                              break;
  127.                          case 1:
  128.                              textview1.setText(d+"*"+a+"-"+b+"=");
  129.                              answer=(double) (d*a-b);
  130.                              break;
  131.                          case 2:
  132.                              textview1.setText(a+"*"+b+"+"+c+"=");
  133.                              answer=(double) (a*b+c);
  134.                              break;
  135.                          case 3:
  136.                              while(c==0){
  137.                                  c =new Random().nextInt(100);
  138.                              }
  139.                              textview1.setText(a+"/"+c+"=");
  140.                              BigDecimal   y   =   new   BigDecimal((double)a/c);
  141.                              answer  =   y.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
  142.  
  143.                              break;
  144.                          }
  145.                      }
  146.                      else
  147.                      {
  148.                          int right=n-w;
  149.                          double rvate=(double)right/n*100;
  150.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity1.this);
  151.                          builder.setCancelable(false);
  152.                          builder.setTitle("结束");
  153.                          builder.setMessage("你答对了"+right+"题"+"\n"+"答错了"+w+"题"+"\n"+"正确率为"+rvate+"%");
  154.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  155.  
  156.                              public void onClick(DialogInterface dialog, int whichButton) {
  157.                                  Intent intent = new Intent(CalActivity1.this, MainActivity.class);
  158.                                  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  159.                                  startActivity(intent);
  160.                              }
  161.                          });
  162.                          builder.create().show();
  163.                      }
  164.                  }
  165.  
  166.              });
  167.  
  168.       }
  169.       public boolean checkInteger(String text) {
  170.           /*      当输入的文本去掉前后空格长度为0时返回false  */
  171.           if(text.trim().length()==0){
  172.                   return false;
  173.           }
  174.           try{
  175.                   Double.parseDouble(text);
  176.           }catch(Exception e){
  177.                   /*      无法转换为整数时返回false   */
  178.                   return false;
  179.           }
  180.           return true;
  181.   }
  182.  }

CalActivity1

加法练习代码：

  1.  package com.example.szys;
  2.  
  3.  import java.math.*;
  4.  import java.util.Random;
  5.  
  6.  import android.app.Activity;
  7.  import android.app.AlertDialog;
  8.  import android.content.ContentValues;
  9.  import android.content.DialogInterface;
  10.  import android.content.Intent;
  11.  import android.database.Cursor;
  12.  import android.os.Bundle;
  13.  import android.view.View;
  14.  import android.widget.Button;
  15.  import android.widget.EditText;
  16.  import android.widget.TextView;
  17.  
  18.  public class CalActivity2 extends Activity {
  19.      int a;
  20.      int b;
  21.      int n=0;
  22.      int w=0;
  23.      String r;
  24.      Double answer,respon;
  25.      TextView textview1,textview2;
  26.      EditText editText;
  27.      Button button;
  28.       @Override
  29.       protected void onCreate(Bundle savedInstanceState) {
  30.           super.onCreate(savedInstanceState);
  31.           setContentView(R.layout.cal_main);
  32.           textview1=(TextView)findViewById(R.id.textView1);
  33.           textview2=(TextView)findViewById(R.id.textView2);
  34.           editText=(EditText)findViewById(R.id.EditText1);
  35.               a =new Random().nextInt(100);
  36.              b =new Random().nextInt(100);
  37.  
  38.                  textview1.setText(a+"+"+b+"=");
  39.                  answer=(double) (a+b);
  40.  
  41.              button=(Button)findViewById(R.id.button4);
  42.              button.setOnClickListener(new Button.OnClickListener(){
  43.  
  44.                  @Override
  45.                  public void onClick(View arg0) {
  46.                      // TODO Auto-generated method stub
  47.                      if(!checkInteger(editText.getText().toString()))
  48.                      {
  49.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity2.this);
  50.                          builder.setCancelable(false);
  51.                          builder.setTitle("错误");
  52.                          builder.setMessage("你输入的信息有错");
  53.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  54.  
  55.                              public void onClick(DialogInterface dialog, int whichButton) {  
  56.  
  57.                              }
  58.                          });
  59.                          builder.create().show();
  60.                          editText.setText("");
  61.                          return;
  62.                      }
  63.                      respon=Double.parseDouble(editText.getText().toString());
  64.                      r=textview1.getText().toString();
  65.                      ContentValues values = new ContentValues();
  66.                      values.put("problem", r);
  67.                      values.put("answer", answer);
  68.                      editText.setText("");
  69.                      n++;
  70.                      if(respon.equals(answer))
  71.                      {
  72.                          textview2.setText("你答对了！");
  73.                      }
  74.                      else{
  75.                          DBHelper helper = new DBHelper(getApplicationContext());
  76.                          final Cursor c = helper.query();
  77.                          helper.insert(values);
  78.                          w++;
  79.                          textview2.setText("你答错了！\n"+r+answer);
  80.                          helper.close();
  81.                      }
  82.                      if(n<5)
  83.                      {
  84.                          a =new Random().nextInt(100);
  85.                          b =new Random().nextInt(100);
  86.  
  87.                              textview1.setText(a+"+"+b+"=");
  88.                              answer=(double) (a+b);
  89.  
  90.                      }
  91.                      else
  92.                      {
  93.                          int right=n-w;
  94.                          double rvate=(double)right/n*100;
  95.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity2.this);
  96.                          builder.setCancelable(false);
  97.                          builder.setTitle("结束");
  98.                          builder.setMessage("你答对了"+right+"题"+"\n"+"答错了"+w+"题"+"\n"+"正确率为"+rvate+"%");
  99.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  100.  
  101.                              public void onClick(DialogInterface dialog, int whichButton) {
  102.                                  Intent intent = new Intent(CalActivity2.this, MainActivity.class);
  103.                                  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  104.                                  startActivity(intent);
  105.                              }
  106.                          });
  107.                          builder.create().show();
  108.                      }
  109.                  }
  110.  
  111.              });
  112.  
  113.       }
  114.       public boolean checkInteger(String text) {
  115.           /*      当输入的文本去掉前后空格长度为0时返回false  */
  116.           if(text.trim().length()==0){
  117.                   return false;
  118.           }
  119.           try{
  120.                   Double.parseDouble(text);
  121.           }catch(Exception e){
  122.                   /*      无法转换为整数时返回false   */
  123.                   return false;
  124.           }
  125.           return true;
  126.   }
  127.  }

CalActivity2

减法练习代码：

  1.  package com.example.szys;
  2.  
  3.  import java.math.*;
  4.  import java.util.Random;
  5.  
  6.  import android.app.Activity;
  7.  import android.app.AlertDialog;
  8.  import android.content.ContentValues;
  9.  import android.content.DialogInterface;
  10.  import android.content.Intent;
  11.  import android.database.Cursor;
  12.  import android.os.Bundle;
  13.  import android.view.View;
  14.  import android.widget.Button;
  15.  import android.widget.EditText;
  16.  import android.widget.TextView;
  17.  
  18.  public class CalActivity3 extends Activity {
  19.  
  20.      int a;
  21.      int b;
  22.      int n=0;
  23.      int w=0;
  24.      String r;
  25.      Double answer,respon;
  26.      TextView textview1,textview2;
  27.      EditText editText;
  28.      Button button;
  29.       @Override
  30.       protected void onCreate(Bundle savedInstanceState) {
  31.           super.onCreate(savedInstanceState);
  32.           setContentView(R.layout.cal_main);
  33.           textview1=(TextView)findViewById(R.id.textView1);
  34.           textview2=(TextView)findViewById(R.id.textView2);
  35.           editText=(EditText)findViewById(R.id.EditText1);
  36.               a =new Random().nextInt(100);
  37.              b =new Random().nextInt(100);
  38.  
  39.                  textview1.setText(a+"-"+b+"=");
  40.                  answer=(double) (a-b);
  41.  
  42.              button=(Button)findViewById(R.id.button4);
  43.              button.setOnClickListener(new Button.OnClickListener(){
  44.  
  45.                  @Override
  46.                  public void onClick(View arg0) {
  47.                      // TODO Auto-generated method stub
  48.                      if(!checkInteger(editText.getText().toString()))
  49.                      {
  50.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity3.this);
  51.                          builder.setCancelable(false);
  52.                          builder.setTitle("错误");
  53.                          builder.setMessage("你输入的信息有错");
  54.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  55.  
  56.                              public void onClick(DialogInterface dialog, int whichButton) {  
  57.  
  58.                              }
  59.                          });
  60.                          builder.create().show();
  61.                          editText.setText("");
  62.                          return;
  63.                      }
  64.                      respon=Double.parseDouble(editText.getText().toString());
  65.                      r=textview1.getText().toString();
  66.                      ContentValues values = new ContentValues();
  67.                      values.put("problem", r);
  68.                      values.put("answer", answer);
  69.                      editText.setText("");
  70.                      n++;
  71.                      if(respon.equals(answer))
  72.                      {
  73.                          textview2.setText("你答对了！");
  74.                      }
  75.                      else{
  76.                          DBHelper helper = new DBHelper(getApplicationContext());
  77.                          final Cursor c = helper.query();
  78.                          helper.insert(values);
  79.                          w++;
  80.                          textview2.setText("你答错了！\n"+r+answer);
  81.                          helper.close();
  82.                      }
  83.                      if(n<5)
  84.                      {
  85.                          a =new Random().nextInt(100);
  86.                          b =new Random().nextInt(100);
  87.  
  88.                              textview1.setText(a+"-"+b+"=");
  89.                              answer=(double) (a-b);
  90.                      }
  91.                      else
  92.                      {
  93.                          int right=n-w;
  94.                          double rvate=(double)right/n*100;
  95.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity3.this);
  96.                          builder.setCancelable(false);
  97.                          builder.setTitle("结束");
  98.                          builder.setMessage("你答对了"+right+"题"+"\n"+"答错了"+w+"题"+"\n"+"正确率为"+rvate+"%");
  99.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  100.  
  101.                              public void onClick(DialogInterface dialog, int whichButton) {
  102.                                  Intent intent = new Intent(CalActivity3.this, MainActivity.class);
  103.                                  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  104.                                  startActivity(intent);
  105.                              }
  106.                          });
  107.                          builder.create().show();
  108.                      }
  109.                  }
  110.  
  111.              });
  112.  
  113.       }
  114.       public boolean checkInteger(String text) {
  115.           /*      当输入的文本去掉前后空格长度为0时返回false  */
  116.           if(text.trim().length()==0){
  117.                   return false;
  118.           }
  119.           try{
  120.                   Double.parseDouble(text);
  121.           }catch(Exception e){
  122.                   /*      无法转换为整数时返回false   */
  123.                   return false;
  124.           }
  125.           return true;
  126.   }
  127.  }

CalActivity3

乘法练习代码：

  1.  package com.example.szys;
  2.  
  3.  import java.math.*;
  4.  import java.util.Random;
  5.  
  6.  import android.app.Activity;
  7.  import android.app.AlertDialog;
  8.  import android.content.ContentValues;
  9.  import android.content.DialogInterface;
  10.  import android.content.Intent;
  11.  import android.database.Cursor;
  12.  import android.os.Bundle;
  13.  import android.view.View;
  14.  import android.widget.Button;
  15.  import android.widget.EditText;
  16.  import android.widget.TextView;
  17.  
  18.  public class CalActivity4 extends Activity {
  19.  
  20.      int a;
  21.      int b;
  22.      int n=0;
  23.      int w=0;
  24.      String r;
  25.      Double answer,respon;
  26.      TextView textview1,textview2;
  27.      EditText editText;
  28.      Button button;
  29.       @Override
  30.       protected void onCreate(Bundle savedInstanceState) {
  31.           super.onCreate(savedInstanceState);
  32.           setContentView(R.layout.cal_main);
  33.           textview1=(TextView)findViewById(R.id.textView1);
  34.           textview2=(TextView)findViewById(R.id.textView2);
  35.           editText=(EditText)findViewById(R.id.EditText1);
  36.               a =new Random().nextInt(100);
  37.              b =new Random().nextInt(100);
  38.  
  39.                  textview1.setText(a+"*"+b+"=");
  40.                  answer=(double) (a*b);
  41.  
  42.              button=(Button)findViewById(R.id.button4);
  43.              button.setOnClickListener(new Button.OnClickListener(){
  44.  
  45.                  @Override
  46.                  public void onClick(View arg0) {
  47.                      // TODO Auto-generated method stub
  48.                      if(!checkInteger(editText.getText().toString()))
  49.                      {
  50.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity4.this);
  51.                          builder.setCancelable(false);
  52.                          builder.setTitle("错误");
  53.                          builder.setMessage("你输入的信息有错");
  54.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  55.  
  56.                              public void onClick(DialogInterface dialog, int whichButton) {  
  57.  
  58.                              }
  59.                          });
  60.                          builder.create().show();
  61.                          editText.setText("");
  62.                          return;
  63.                      }
  64.                      respon=Double.parseDouble(editText.getText().toString());
  65.                      r=textview1.getText().toString();
  66.                      ContentValues values = new ContentValues();
  67.                      values.put("problem", r);
  68.                      values.put("answer", answer);
  69.                      editText.setText("");
  70.                      n++;
  71.                      if(respon.equals(answer))
  72.                      {
  73.                          textview2.setText("你答对了！");
  74.                      }
  75.                      else{
  76.                          DBHelper helper = new DBHelper(getApplicationContext());
  77.                          final Cursor c = helper.query();
  78.                          helper.insert(values);
  79.                          w++;
  80.                          textview2.setText("你答错了！\n"+r+answer);
  81.                          helper.close();
  82.                      }
  83.                      if(n<5)
  84.                      {
  85.                          a =new Random().nextInt(100);
  86.                          b =new Random().nextInt(100);
  87.  
  88.                              textview1.setText(a+"*"+b+"=");
  89.                              answer=(double) (a*b);
  90.  
  91.                      }
  92.                      else
  93.                      {
  94.                          int right=n-w;
  95.                          double rvate=(double)right/n*100;
  96.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity4.this);
  97.                          builder.setCancelable(false);
  98.                          builder.setTitle("结束");
  99.                          builder.setMessage("你答对了"+right+"题"+"\n"+"答错了"+w+"题"+"\n"+"正确率为"+rvate+"%");
  100.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  101.  
  102.                              public void onClick(DialogInterface dialog, int whichButton) {
  103.                                  Intent intent = new Intent(CalActivity4.this, MainActivity.class);
  104.                                  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  105.                                  startActivity(intent);
  106.                              }
  107.                          });
  108.                          builder.create().show();
  109.                      }
  110.                  }
  111.  
  112.              });
  113.  
  114.       }
  115.       public boolean checkInteger(String text) {
  116.           /*      当输入的文本去掉前后空格长度为0时返回false  */
  117.           if(text.trim().length()==0){
  118.                   return false;
  119.           }
  120.           try{
  121.                   Double.parseDouble(text);
  122.           }catch(Exception e){
  123.                   /*      无法转换为整数时返回false   */
  124.                   return false;
  125.           }
  126.           return true;
  127.   }
  128.  }

CalActivity4

除法练习代码：

  1.  package com.example.szys;
  2.  
  3.  import java.math.*;
  4.  import java.util.Random;
  5.  
  6.  import android.app.Activity;
  7.  import android.app.AlertDialog;
  8.  import android.content.ContentValues;
  9.  import android.content.DialogInterface;
  10.  import android.content.Intent;
  11.  import android.database.Cursor;
  12.  import android.os.Bundle;
  13.  import android.view.View;
  14.  import android.widget.Button;
  15.  import android.widget.EditText;
  16.  import android.widget.TextView;
  17.  
  18.  public class CalActivity5 extends Activity {
  19.  
  20.      int a;
  21.      int b;
  22.      int n=0;
  23.      int w=0;
  24.      String r;
  25.      Double answer,respon;
  26.      TextView textview1,textview2;
  27.      EditText editText;
  28.      Button button;
  29.       @Override
  30.       protected void onCreate(Bundle savedInstanceState) {
  31.           super.onCreate(savedInstanceState);
  32.           setContentView(R.layout.cal_main);
  33.           textview1=(TextView)findViewById(R.id.textView1);
  34.           textview2=(TextView)findViewById(R.id.textView2);
  35.           editText=(EditText)findViewById(R.id.EditText1);
  36.               a =new Random().nextInt(100);
  37.              b =new Random().nextInt(100);
  38.  
  39.                  while(b==0){
  40.                      b =new Random().nextInt(100);
  41.                  }
  42.                  textview1.setText(a+"/"+b+"=");
  43.                  BigDecimal   x   =   new   BigDecimal((double)a/b);
  44.                  answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
  45.  
  46.              button=(Button)findViewById(R.id.button4);
  47.              button.setOnClickListener(new Button.OnClickListener(){
  48.  
  49.                  @Override
  50.                  public void onClick(View arg0) {
  51.                      // TODO Auto-generated method stub
  52.                      if(!checkInteger(editText.getText().toString()))
  53.                      {
  54.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity5.this);
  55.                          builder.setCancelable(false);
  56.                          builder.setTitle("错误");
  57.                          builder.setMessage("你输入的信息有错");
  58.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  59.  
  60.                              public void onClick(DialogInterface dialog, int whichButton) {  
  61.  
  62.                              }
  63.                          });
  64.                          builder.create().show();
  65.                          editText.setText("");
  66.                          return;
  67.                      }
  68.                      respon=Double.parseDouble(editText.getText().toString());
  69.                      r=textview1.getText().toString();
  70.                      ContentValues values = new ContentValues();
  71.                      values.put("problem", r);
  72.                      values.put("answer", answer);
  73.                      editText.setText("");
  74.                      n++;
  75.                      if(respon.equals(answer))
  76.                      {
  77.                          textview2.setText("你答对了！");
  78.                      }
  79.                      else{
  80.                          DBHelper helper = new DBHelper(getApplicationContext());
  81.                          final Cursor c = helper.query();
  82.                          helper.insert(values);
  83.                          w++;
  84.                          textview2.setText("你答错了！\n"+r+answer);
  85.                          helper.close();
  86.                      }
  87.                      if(n<5)
  88.                      {
  89.                          a =new Random().nextInt(100);
  90.                          b =new Random().nextInt(100);
  91.  
  92.                              while(b==0){
  93.                                  b =new Random().nextInt(100);
  94.                              }
  95.                              textview1.setText(a+"/"+b+"=");
  96.                              BigDecimal   x   =   new   BigDecimal((double)a/b);
  97.                              answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
  98.  
  99.                      }
  100.                      else
  101.                      {
  102.                          int right=n-w;
  103.                          double rvate=(double)right/n*100;
  104.                          AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity5.this);
  105.                          builder.setCancelable(false);
  106.                          builder.setTitle("结束");
  107.                          builder.setMessage("你答对了"+right+"题"+"\n"+"答错了"+w+"题"+"\n"+"正确率为"+rvate+"%");
  108.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  109.  
  110.                              public void onClick(DialogInterface dialog, int whichButton) {
  111.                                  Intent intent = new Intent(CalActivity5.this, MainActivity.class);
  112.                                  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  113.                                  startActivity(intent);
  114.                              }
  115.                          });
  116.                          builder.create().show();
  117.                      }
  118.                  }
  119.  
  120.              });
  121.  
  122.       }
  123.       public boolean checkInteger(String text) {
  124.           /*      当输入的文本去掉前后空格长度为0时返回false  */
  125.           if(text.trim().length()==0){
  126.                   return false;
  127.           }
  128.           try{
  129.                   Double.parseDouble(text);
  130.           }catch(Exception e){
  131.                   /*      无法转换为整数时返回false   */
  132.                   return false;
  133.           }
  134.           return true;
  135.   }
  136.  }

CalActivity5

主页面代码：

  1.  package com.example.szys;
  2.  
  3.  import android.app.Activity;
  4.  import android.app.AlertDialog;
  5.  import android.content.DialogInterface;
  6.  import android.content.Intent;
  7.  import android.database.Cursor;
  8.  import android.os.Bundle;
  9.  import android.view.View;
  10.  import android.widget.Button;
  11.  
  12.  public class MainActivity extends Activity {
  13.  
  14.      Button start,end,wa;
  15.      int yourChose=-1;  
  16.  
  17.      private void showSinChosDia()
  18.      {
  19.          final String[] mList={"普通","困难","加法练习","减法练习","乘法练习","除法练习"};
  20.          yourChose=-1;
  21.          AlertDialog.Builder sinChosDia=new AlertDialog.Builder(MainActivity.this);
  22.          sinChosDia.setTitle("难度/单项练习");
  23.          sinChosDia.setSingleChoiceItems(mList, 0, new DialogInterface.OnClickListener() {  
  24.  
  25.              @Override
  26.              public void onClick(DialogInterface dialog, int which) {
  27.                  // TODO Auto-generated method stub
  28.                  yourChose=which;  
  29.  
  30.              }
  31.          });
  32.          sinChosDia.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  33.  
  34.              @Override
  35.              public void onClick(DialogInterface dialog, int which) {
  36.                  // TODO Auto-generated method stub  
  37.  
  38.                  if(yourChose==0)
  39.                  {
  40.                      Intent intent = new Intent(MainActivity.this, CalActivity.class);
  41.                      startActivity(intent);
  42.                  }
  43.                  if(yourChose==1)
  44.                  {
  45.                      Intent intent = new Intent(MainActivity.this, CalActivity1.class);
  46.                      startActivity(intent);
  47.                  }
  48.                  if(yourChose==2)
  49.                  {
  50.                      Intent intent = new Intent(MainActivity.this, CalActivity2.class);
  51.                      startActivity(intent);
  52.                  }
  53.                  if(yourChose==3)
  54.                  {
  55.                      Intent intent = new Intent(MainActivity.this, CalActivity3.class);
  56.                      startActivity(intent);
  57.                  }
  58.                  if(yourChose==4)
  59.                  {
  60.                      Intent intent = new Intent(MainActivity.this, CalActivity4.class);
  61.                      startActivity(intent);
  62.                  }
  63.                  if(yourChose==5)
  64.                  {
  65.                      Intent intent = new Intent(MainActivity.this, CalActivity5.class);
  66.                      startActivity(intent);
  67.                  }
  68.              }
  69.          });
  70.          sinChosDia.create().show();
  71.      }  
  72.  
  73.      @Override
  74.  
  75.      protected void onCreate(Bundle savedInstanceState) {
  76.          super.onCreate(savedInstanceState);
  77.          setContentView(R.layout.activity_main);
  78.          final DBHelper helper = new DBHelper(this);
  79.          final Cursor c = helper.query();
  80.          start=(Button) findViewById(R.id.button1);
  81.          start.setOnClickListener(new Button.OnClickListener(){
  82.  
  83.              @Override
  84.  
  85.              public void onClick(View v) {
  86.                  // TODO Auto-generated method stub
  87.  
  88.                  showSinChosDia();
  89.  
  90.              }
  91.          });
  92.          wa=(Button) findViewById(R.id.button2);
  93.          wa.setOnClickListener(new Button.OnClickListener(){
  94.  
  95.              @Override
  96.              public void onClick(View v) {
  97.                  // TODO Auto-generated method stub
  98.                  if(!c.moveToNext())
  99.                  {
  100.                      helper.close();
  101.                      AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
  102.                      builder.setCancelable(false);
  103.                      builder.setTitle("结束");
  104.                      builder.setMessage("无错题");
  105.                      builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  106.  
  107.                          public void onClick(DialogInterface dialog, int whichButton) {
  108.                          }
  109.                      });
  110.                      builder.create().show();
  111.                  }
  112.                  else{
  113.                      Intent intent = new Intent(MainActivity.this, ShowDB.class);
  114.                      startActivity(intent);
  115.                  }
  116.              }
  117.          });
  118.          end=(Button) findViewById(R.id.button3);
  119.          end.setOnClickListener(new Button.OnClickListener(){
  120.  
  121.              @Override
  122.              public void onClick(View v) {
  123.                  // TODO Auto-generated method stub
  124.                  System.exit(0);
  125.              }
  126.          });
  127.      }
  128.  
  129.  }

MainActivity

数据库代码：

  1.  package com.example.szys;
  2.  
  3.  import android.content.ContentValues;
  4.  import android.content.Context;
  5.  import android.database.Cursor;
  6.  import android.database.sqlite.SQLiteDatabase;
  7.  import android.database.sqlite.SQLiteOpenHelper;
  8.  public class DBHelper extends SQLiteOpenHelper {
  9.      private static final String DB_NAME = "coll.db";
  10.      private static final String TBL_NAME = "CollTbl";
  11.      private static final String CREATE_TBL = " create table "
  12.              + " CollTbl(_id integer primary key autoincrement,problem text,answer text) ";
  13.  
  14.      private SQLiteDatabase db;
  15.      DBHelper(Context c) {
  16.          super(c, DB_NAME, null, 2);
  17.      }
  18.      @Override
  19.      public void onCreate(SQLiteDatabase db) {
  20.          this.db = db;
  21.          db.execSQL(CREATE_TBL);
  22.      }
  23.      public void insert(ContentValues values) {
  24.          SQLiteDatabase db = getWritableDatabase();
  25.          db.insert(TBL_NAME, null, values);
  26.          db.close();
  27.      }
  28.      public Cursor query() {
  29.          SQLiteDatabase db = getWritableDatabase();
  30.          Cursor c = db.query(TBL_NAME, null, null, null, null, null, null);
  31.          return c;
  32.      }
  33.      public void del(int id) {
  34.          if (db == null)
  35.              db = getWritableDatabase();
  36.          db.delete(TBL_NAME, "_id=?", new String[] { String.valueOf(id) });
  37.      }
  38.      public void close() {
  39.          if (db != null)
  40.              db.close();
  41.      }
  42.      @Override
  43.      public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  44.      }
  45.  }

DBHelper

错题巩固代码：

  1.  package com.example.szys;
  2.  
  3.  import java.math.BigDecimal;
  4.  import java.util.Random;
  5.  
  6.  import android.app.Activity;
  7.  import android.app.AlertDialog;
  8.  import android.content.ContentValues;
  9.  import android.content.DialogInterface;
  10.  import android.content.Intent;
  11.  import android.database.Cursor;
  12.  import android.database.sqlite.SQLiteDatabase;
  13.  import android.os.Bundle;
  14.  import android.view.View;
  15.  import android.widget.Button;
  16.  import android.widget.EditText;
  17.  import android.widget.TextView;
  18.  
  19.  public class ShowDB extends Activity {
  20.      int op;
  21.      int a;
  22.      int b;
  23.      int n=0;
  24.      int w=0;
  25.      String r;
  26.      Double respon,answer;
  27.      String problem;
  28.      TextView textview1,textview2;
  29.      EditText editText;
  30.      Button button,button1,button2,button3;
  31.       @Override
  32.       protected void onCreate(Bundle savedInstanceState) {
  33.           super.onCreate(savedInstanceState);
  34.           setContentView(R.layout.show_maiin);
  35.           textview1=(TextView)findViewById(R.id.textView1);
  36.           textview2=(TextView)findViewById(R.id.textView2);
  37.           editText=(EditText)findViewById(R.id.EditText1);
  38.           final DBHelper helper = new DBHelper(this);
  39.           final Cursor c = helper.query();
  40.              c.moveToNext();
  41.              problem = c.getString(c.getColumnIndex("problem"));
  42.              answer = Double.parseDouble(c.getString(c.getColumnIndex("answer")));
  43.              textview1.setText(problem);
  44.              button=(Button)findViewById(R.id.button6);
  45.              button.setOnClickListener(new Button.OnClickListener(){
  46.  
  47.                  @Override
  48.                  public void onClick(View arg0) {
  49.                      // TODO Auto-generated method stub
  50.                      if(!checkInteger(editText.getText().toString()))
  51.                      {
  52.                          AlertDialog.Builder builder = new AlertDialog.Builder(ShowDB.this);
  53.                          builder.setCancelable(false);
  54.                          builder.setTitle("错误");
  55.                          builder.setMessage("你输入的信息有错");
  56.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  57.  
  58.                              public void onClick(DialogInterface dialog, int whichButton) {  
  59.  
  60.                              }
  61.                          });
  62.                          builder.create().show();
  63.                          editText.setText("");
  64.                          return;
  65.                      }
  66.                      respon=Double.parseDouble(editText.getText().toString());
  67.                      if(respon.equals(answer))
  68.                      {
  69.                          textview2.setText("你答对了！");
  70.                          editText.setText("");
  71.                      }
  72.                      else{
  73.                          w++;
  74.                          textview2.setText("你答错了！\n"+problem+answer);
  75.                          editText.setText("");
  76.                      }
  77.                      if(!c.moveToNext())
  78.                      {
  79.                          AlertDialog.Builder builder = new AlertDialog.Builder(ShowDB.this);
  80.                          builder.setCancelable(false);
  81.                          builder.setTitle("结束");
  82.                          builder.setMessage("");
  83.                          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  84.  
  85.                              public void onClick(DialogInterface dialog, int whichButton) {
  86.                                  Intent intent = new Intent(ShowDB.this, MainActivity.class);
  87.                                  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  88.                                  startActivity(intent);
  89.                              }
  90.                          });
  91.                          builder.create().show();
  92.                      }
  93.                  }
  94.  
  95.              });
  96.              button1=(Button)findViewById(R.id.button7);
  97.              button1.setOnClickListener(new Button.OnClickListener(){
  98.  
  99.                  @Override
  100.                  public void onClick(View arg0) {
  101.                      // TODO Auto-generated method stub
  102.  
  103.                      if(c.moveToNext())
  104.                      {
  105.                          editText.setText("");
  106.                          problem = c.getString(c.getColumnIndex("problem"));
  107.                          answer = Double.parseDouble(c.getString(c.getColumnIndex("answer")));
  108.                          textview1.setText(problem);
  109.                      }
  110.                  }
  111.  
  112.              });
  113.              button2=(Button)findViewById(R.id.button8);
  114.              button2.setOnClickListener(new Button.OnClickListener(){
  115.  
  116.                  @Override
  117.                  public void onClick(View arg0) {
  118.                      // TODO Auto-generated method stub
  119.                      helper.del(c.getInt(0));
  120.                      AlertDialog.Builder builder = new AlertDialog.Builder(ShowDB.this);
  121.                      builder.setCancelable(false);
  122.                      builder.setTitle("提示");
  123.                      builder.setMessage("删除成功");
  124.                      builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  125.  
  126.                          public void onClick(DialogInterface dialog, int whichButton) {
  127.                              if(c.moveToNext())
  128.                              {
  129.                                  editText.setText("");
  130.                                  problem = c.getString(c.getColumnIndex("problem"));
  131.                                  answer = Double.parseDouble(c.getString(c.getColumnIndex("answer")));
  132.                                  textview1.setText(problem);
  133.                              }
  134.                              else if(!c.moveToNext())
  135.                              {
  136.                                  textview1.setText("");
  137.                                  AlertDialog.Builder builder = new AlertDialog.Builder(ShowDB.this);
  138.                                  builder.setCancelable(false);
  139.                                  builder.setTitle("结束");
  140.                                  builder.setMessage("已无错题");
  141.                                  builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
  142.  
  143.                                      public void onClick(DialogInterface dialog, int whichButton) {
  144.                                          Intent intent = new Intent(ShowDB.this, MainActivity.class);
  145.                                          intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  146.                                          startActivity(intent);
  147.                                      }
  148.                                  });
  149.                                  builder.create().show();
  150.                              }
  151.                          }
  152.                      });
  153.                      builder.create().show();
  154.                      }
  155.  
  156.              });
  157.              button3=(Button)findViewById(R.id.button9);
  158.              button3.setOnClickListener(new Button.OnClickListener(){
  159.  
  160.                  @Override
  161.                  public void onClick(View arg0) {
  162.                      // TODO Auto-generated method stub
  163.  
  164.                      Intent intent = new Intent(ShowDB.this, MainActivity.class);
  165.                      intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  166.                      startActivity(intent);
  167.                  }
  168.  
  169.              });
  170.  
  171.       }
  172.       public boolean checkInteger(String text) {
  173.           /*      当输入的文本去掉前后空格长度为0时返回false  */
  174.           if(text.trim().length()==0){
  175.                   return false;
  176.           }
  177.           try{
  178.                   Double.parseDouble(text);
  179.           }catch(Exception e){
  180.                   /*      无法转换为整数时返回false   */
  181.                   return false;
  182.           }
  183.           return true;
  184.   }
  185.  
  186.  }

ShowDB

XML代码

  1.  <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  2.      xmlns:tools="http://schemas.android.com/tools"
  3.      android:id="@+id/container"
  4.      android:layout_width="match_parent"
  5.      android:layout_height="match_parent"
  6.      android:orientation="vertical"
  7.      android:background="@drawable/bg1">
  8.  
  9.      <LinearLayout
  10.          android:layout_width="fill_parent"
  11.          android:layout_height="wrap_content"
  12.          android:orientation="vertical"
  13.          android:layout_gravity="center">
  14.  
  15.          <Button
  16.          android:id="@+id/button1"
  17.          android:layout_width="fill_parent"
  18.          android:layout_height="wrap_content"
  19.          android:text="开始" />
  20.  
  21.              <Button
  22.          android:id="@+id/button2"
  23.          android:layout_width="fill_parent"
  24.          android:layout_height="wrap_content"
  25.          android:text="错题巩固" />
  26.  
  27.              <Button
  28.          android:id="@+id/button3"
  29.          android:layout_width="fill_parent"
  30.          android:layout_height="wrap_content"
  31.          android:text="退出" />
  32.  
  33.      </LinearLayout>
  34.  
  35.  </FrameLayout>

activity_main

  1.  <?xml version="1.0" encoding="utf-8"?>
  2.  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.      android:layout_width="match_parent"
  4.      android:layout_height="match_parent"
  5.      android:orientation="vertical"
  6.      android:background="@drawable/bg1">
  7.  
  8.      <LinearLayout
  9.         android:layout_width="fill_parent"
  10.          android:layout_height="wrap_content"
  11.          android:orientation="vertical"
  12.          android:layout_gravity="center">
  13.  
  14.          <LinearLayout
  15.              android:layout_width="match_parent"
  16.              android:layout_height="wrap_content"
  17.              android:layout_gravity="center" >
  18.  
  19.              <TextView
  20.                  android:id="@+id/textView1"
  21.                  android:layout_width="93dp"
  22.                  android:layout_height="wrap_content"
  23.                  android:editable="true"
  24.                  android:text="" />
  25.  
  26.              <EditText
  27.                  android:id="@+id/EditText1"
  28.                  android:layout_width="wrap_content"
  29.                  android:layout_height="wrap_content"
  30.                  android:digits="1234567890.-"
  31.                  android:ems="10"
  32.                  android:numeric="decimal"
  33.                  android:text="" >
  34.  
  35.                  <requestFocus />
  36.              </EditText>
  37.          </LinearLayout>
  38.  
  39.          <Button
  40.          android:id="@+id/button4"
  41.          android:layout_width="match_parent"
  42.          android:layout_height="wrap_content"
  43.          android:text="确定" />
  44.  
  45.          <TextView
  46.              android:id="@+id/textView2"
  47.              android:layout_width="match_parent"
  48.              android:layout_height="70dp"
  49.              android:editable="true"
  50.              android:text="" />
  51.  
  52.      </LinearLayout>
  53.  
  54.  </LinearLayout>

cal_main

  1.  <?xml version="1.0" encoding="utf-8"?>
  2.  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.      android:layout_width="match_parent"
  4.      android:layout_height="match_parent"
  5.      android:orientation="vertical"
  6.      android:background="@drawable/bg1">
  7.  
  8.      <LinearLayout
  9.         android:layout_width="fill_parent"
  10.          android:layout_height="wrap_content"
  11.          android:orientation="vertical"
  12.          android:layout_gravity="center">
  13.  
  14.          <LinearLayout
  15.              android:layout_width="match_parent"
  16.              android:layout_height="wrap_content"
  17.              android:layout_gravity="center" >
  18.  
  19.              <TextView
  20.                  android:id="@+id/textView1"
  21.                  android:layout_width="93dp"
  22.                  android:layout_height="wrap_content"
  23.                  android:editable="true"
  24.                  android:text="" />
  25.  
  26.              <EditText
  27.                  android:id="@+id/EditText1"
  28.                  android:layout_width="wrap_content"
  29.                  android:layout_height="wrap_content"
  30.                  android:digits="1234567890.-"
  31.                  android:ems="10"
  32.                  android:numeric="decimal"
  33.                  android:text="" >
  34.  
  35.                  <requestFocus />
  36.              </EditText>
  37.          </LinearLayout>
  38.  
  39.          <Button
  40.          android:id="@+id/button6"
  41.          android:layout_width="match_parent"
  42.          android:layout_height="wrap_content"
  43.          android:text="确定" />
  44.          <Button
  45.          android:id="@+id/button7"
  46.          android:layout_width="match_parent"
  47.          android:layout_height="wrap_content"
  48.          android:text="下一题" />
  49.          <Button
  50.          android:id="@+id/button8"
  51.          android:layout_width="match_parent"
  52.          android:layout_height="wrap_content"
  53.          android:text="从错题库删除" />
  54.          <Button
  55.          android:id="@+id/button9"
  56.          android:layout_width="match_parent"
  57.          android:layout_height="wrap_content"
  58.          android:text="返回" />
  59.  
  60.          <TextView
  61.              android:id="@+id/textView2"
  62.              android:layout_width="match_parent"
  63.              android:layout_height="70dp"
  64.              android:editable="true"
  65.              android:text="" />
  66.  
  67.      </LinearLayout>
  68.  
  69.  </LinearLayout>

show_main

可以下载apk:

http://pan.baidu.com/s/1eQjfcSq

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