Android——黑名单

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.hanqi.blacklist.MainActivity"
     android:orientation="vertical">

     <ListView
         android:layout_width="match_parent"
         android:layout_height="0dp"
         android:layout_weight="1"
         android:id="@+id/lv_1">
     </ListView>
     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="添加黑名单"
         android:onClick="add_onClick"/>
 </LinearLayout>

activity_main

 package com.hanqi.blacklist.com.hanqi.blacklist.orm;

 /**
  * Created by lenovo on 2016/6/6.
  */
 //实体类
 public class BlacList {

     private long id;
     private String phoneNumber;

     public long getId() {
         return id;
     }

     public void setId(long id) {
         this.id = id;
     }

     public String getPhoneNumber() {
         return phoneNumber;
     }

     public void setPhoneNumber(String phoneNumber) {
         this.phoneNumber = phoneNumber;
     }

     public BlacList(long id, String phoneNumber) {
         this.id = id;
         this.phoneNumber = phoneNumber;
     }

     public BlacList(String phoneNumber) {
         this.phoneNumber = phoneNumber;
     }
 }

BlacList

 package com.hanqi.blacklist.com.hanqi.blacklist.orm;

 import android.content.ContentValues;
 import android.content.Context;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;

 import java.util.ArrayList;

 /**
  * Created by lenovo on 2016/6/6.
  */
 //数据库操作类
 public class BlackListDAO {

     //private Context context;
     private final String TABLE_NAME = "t_blacklist";
     private DBHelper dh;

     public BlackListDAO(Context context)
     {
         //this.context = context;
         dh = new DBHelper(context);
     }
     //增
     //传入参数:实体类的实例
     public long insert(BlacList blacList)
     {
         long rtn = 0;
         //链接数据库
         SQLiteDatabase sd = dh.getWritableDatabase();
         //执行insert语句
         //insert into t_blacklist (phone_number) values ()
         ContentValues cv = new ContentValues();
         cv.put("phone_number",blacList.getPhoneNumber());
         rtn = sd.insert("t_blacklist",null,cv);
         sd.close();
         return rtn;
     }
     //删
     public int delete(long id)
     {
         int rtn = 0;
         //链接数据库
         SQLiteDatabase sd = dh.getWritableDatabase();
         //delete from t_blacklist where _id = ?
         rtn = sd.delete(TABLE_NAME,"_id = ?",new String[]{id+""});
         sd.close();
         return rtn;
     }
     //改
     public int update(BlacList blacList)
     {
         int rtn = 0;
         //链接数据库
         SQLiteDatabase sd = dh.getWritableDatabase();
         //update t_blacklist set phone_number = ? where _id = ?
         ContentValues cv = new ContentValues();
         cv.put("phone_number",blacList.getPhoneNumber());
         rtn = sd.update(TABLE_NAME,cv,"_id =?",new String[]{blacList.getId()+""});
         sd.close();
         return rtn;
     }
     //查
     //返回查询结果
     public ArrayList<BlacList> getAll()
     {
         ArrayList<BlacList> blacLists = new ArrayList<>();
         //链接数据库
         SQLiteDatabase sd = dh.getWritableDatabase();
         //select * from t_blacklist
         //查询之后得到游标结果集
         Cursor cursor = sd.query(TABLE_NAME, null, null, null, null, null, "_id desc");
         //遍历结果集
         while (cursor.moveToNext())
         {
             //1.把数据转成实体类的实例
             BlacList blacList = new BlacList(cursor.getLong(0),cursor.getString(1));
             //2.把实例放在集合里，返回这个集合
             blacLists.add(blacList);
         }
         cursor.close();
         sd.close();
         //返回这个集合
         return blacLists;
     }
 }

BlackListDAO

 package com.hanqi.blacklist.com.hanqi.blacklist.orm;

 import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteOpenHelper;
 import android.util.Log;

 /**
  * Created by lenovo on 2016/6/7.
  */
 public class DBHelper extends SQLiteOpenHelper {

     public DBHelper(Context context) {
         super(context, "blacklist.db", null, 1);
     }

     @Override
     public void onCreate(SQLiteDatabase db) {

         //1.执行创建数据库的语句
         String sql = "CREATE TABLE t_blacklist " +
                 "(_id  INTEGER NOT NULL," +
                 "phone_number  VARCHAR(20) NOT NULL,"
                 +"PRIMARY KEY (\"_id\"))";
         db.execSQL(sql);
         Log.e("TAG", "表创建成功");
     }

     @Override
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

     }
 }

DBHelper

 package com.hanqi.blacklist;

 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.text.InputType;
 import android.view.ContextMenu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.BaseAdapter;
 import android.widget.EditText;
 import android.widget.ListView;
 import android.widget.TextView;
 import android.widget.Toast;

 import com.hanqi.blacklist.com.hanqi.blacklist.orm.BlacList;
 import com.hanqi.blacklist.com.hanqi.blacklist.orm.BlackListDAO;

 import java.util.ArrayList;

 public class MainActivity extends AppCompatActivity {

     ListView lv_1;
     //数据访问对象
     BlackListDAO bld = new BlackListDAO(this);
     //数据集合
     ArrayList<BlacList> alb;

     BLAdapter bla;

     //长按数据的索引
     int index;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         lv_1 = (ListView)findViewById(R.id.lv_1);
         //增加上下文菜单，设置创建上下文菜单的监听器
         lv_1.setOnCreateContextMenuListener(this);
         //获取数据集合
         alb = bld.getAll();
         //显示数据
         //adapter
         bla = new BLAdapter();
         lv_1.setAdapter(bla);
     }
     //重写创建上下文菜单的方法
     @Override
     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
         super.onCreateContextMenu(menu, v, menuInfo);
         menu.add(0, 1, 1, "修改");
         menu.add(0, 2, 2, "删除");
         //获取长按的数据信息
         //1.得到菜单信息
         AdapterView.AdapterContextMenuInfo acmi =
                 (AdapterView.AdapterContextMenuInfo)menuInfo;
         //2.得到数据在集合中的索引
         index = acmi.position;
     }
     //响应菜单点击的回调方法
     @Override
     public boolean onContextItemSelected(MenuItem item) {

         switch (item.getItemId())
         {
             case 1:
                 //修改
                 final EditText editText = new EditText(this);
                 editText.setHint("输入电话号码");
                 editText.setInputType(InputType.TYPE_CLASS_PHONE);
                 editText.setText(alb.get(index).getPhoneNumber());
                 new AlertDialog.Builder(this)
                         .setTitle("修改")
                         .setView(editText)
                         .setCancelable(false)
                         .setNegativeButton("取消", null)
                         .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
 //                                BlacList blacList = new BlacList(alb.get(index).getId(),editText.getText().toString());
 //                                bld.update(blacList);
 //                                alb = bld.getAll();
 //                                bla.notifyDataSetChanged();
                                 //1.得到新数据的实体类
                                 //赋值：
                                 // 1）传值，复制新的值再传递，值类型；
                                 // 2）传址，传递的是内存的地址，指向同一个对象，引用类型
                                 BlacList blaclist = alb.get(index);
                                 blaclist.setPhoneNumber(editText.getText().toString());
                                 //2.调用DAO的update()
                                 if (bld.update(blaclist)>0)
                                 {
                                     Toast.makeText(MainActivity.this, "修改成功", Toast.LENGTH_SHORT).show();

                                     bla.notifyDataSetChanged();
                                 }
                                 else
                                 {
                                     Toast.makeText(MainActivity.this, "修改失败", Toast.LENGTH_SHORT).show();
                                 }
                             }
                         })
                         .show();
                 break;
             case 2:
                 //添加删除确认对话框
                 //删除
                 new AlertDialog.Builder(this)
                         .setTitle("确认对话框")
                         .setMessage("确认删除么？")
                         .setNegativeButton("取消", null)
                         .setPositiveButton("确认", new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
                                 bld.delete(alb.get(index).getId());
                                 Toast.makeText(MainActivity.this, "删除成功", Toast.LENGTH_SHORT).show();
                                 //alb = bld.getAll();
                                 alb.remove(index);
                                 bla.notifyDataSetChanged();
                             }
                         })
                         .show();

                 break;
         }
         return super.onContextItemSelected(item);
     }

     //BaseAdapter的实现类
     class BLAdapter extends BaseAdapter
     {
         @Override
         public int getCount() {
             return alb.size();
         }

         @Override
         public Object getItem(int position) {
             return alb.get(position);
         }

         @Override
         public long getItemId(int position) {
             return alb.get(position).getId();
         }

         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
             //得到数据
             BlacList blacList = alb.get(position);
             //得到视图
             if (convertView == null)
             {
                 //构建视图
                 convertView = new TextView(MainActivity.this);
             }
             //视图和数据做显示匹配
             TextView textView = (TextView)convertView;
             textView.setTextSize(20);
             textView.setHeight(80);
             textView.setText(blacList.getPhoneNumber());
             return textView;
         }
     }
     //添加
     public void add_onClick(View v)
     {
         //自定义对话框
         final EditText editText = new EditText(this);
         editText.setHint("输入电话号码");
         editText.setInputType(InputType.TYPE_CLASS_PHONE);
         //构建对话框
        new AlertDialog.Builder(this)
                .setTitle("添加黑名单")
                .setView(editText)
                .setCancelable(false)
                .setNegativeButton("取消", null)
                .setPositiveButton("保存", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //向数据库保存
                        //1.定义实体类
                        BlacList blacList = new BlacList(editText.getText().toString());
                        //2.通过DAO插入数据
                        long l = bld.insert(blacList);
                        if (l > 0) {
                            Toast.makeText(MainActivity.this, "保存成功", Toast.LENGTH_SHORT).show();
                            //更新list
                            //alb = bld.getAll();
                            blacList.setId(l);
                            alb.add(0,blacList);
                            //刷新列表
                            bla.notifyDataSetChanged();
                        }
                        else {
                            Toast.makeText(MainActivity.this, "保存失败", Toast.LENGTH_SHORT).show();
                        }
                    }
                })
                .show();
     }
 }

MainActivity