通讯录

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout 
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     tools:context="com.example.wang.tongxunlu.MainActivity"
 8     android:orientation="vertical">
 9 
10     <ListView
11         android:layout_width="match_parent"
12         android:layout_height="0dp"
13         android:id="@+id/lv_1"
14         android:layout_weight="1"></ListView>
15     <Button
16         android:layout_width="match_parent"
17         android:layout_height="wrap_content"
18         android:text="添加联系人"
19         android:id="@+id/bt_1"
20         android:onClick="bt_OnClick"/>
21 </LinearLayout>

 1 package com.example.administrator.myapplication.com.wang.tongxunlu.orm;
 2 
 3 public class TongXunLu {
 4 
 5     private long id;
 6     private String name;
 7     private  String phone_number;
 8 
 9     public long getId() {
10         return id;
11     }
12 
13     public void setId(long id) {
14         this.id = id;
15     }
16 
17     public String getPhone_number() {
18         return phone_number;
19     }
20 
21     public void setPhone_number(String phone_number) {
22         this.phone_number = phone_number;
23     }
24 
25     public String getName() {
26         return name;
27     }
28 
29     public void setName(String name) {
30         this.name = name;
31     }
32 
33     public TongXunLu(long id, String name, String phone_number) {
34         this.id = id;
35         this.phone_number = phone_number;
36         this.name = name;
37     }
38 
39     public TongXunLu(String name, String phone_number) {
40         this.phone_number = phone_number;
41         this.name = name;
42     }
43 }

 1 package com.example.administrator.myapplication.com.wang.tongxunlu.orm;
 2 
 3 import android.content.Context;
 4 import android.database.sqlite.SQLiteDatabase;
 5 import android.database.sqlite.SQLiteOpenHelper;
 6 
 7 
 8 public class DBHelper extends SQLiteOpenHelper {
 9 
10     @Override
11     public void onCreate(SQLiteDatabase db) {
12 
13         String sql= "CREATE TABLE t_tongxunl (_id  INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," +
14                 "name  TEXT,phone_number  INTEGER)";
15         db.execSQL(sql);
16 
17     }
18 
19     @Override
20     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
21 
22     }
23 
24     public DBHelper(Context context) {
25         super(context, "TongXunl.db", null, 1);
26     }
27 }

  1 package com.example.administrator.myapplication.com.wang.tongxunlu.orm;
  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.util.Log;
  8 
  9 import java.util.ArrayList;
 10 
 11 
 12 //数据库操作类
 13 public class TongXunLuDAO {
 14 
 15     private  DBHelper dh;
 16 
 17     private  final String  TABLENAME="t_tongxunl";
 18 
 19     public TongXunLuDAO(Context context)
 20     {
 21         // this.context=context;
 22 
 23         dh=new DBHelper(context);
 24     }
 25 
 26     //增
 27     //传入参数:实体类的实例
 28     public long insert(TongXunLu tongxunlu)
 29     {
 30         long rtn=0;
 31         //连接数据库
 32         SQLiteDatabase sd=dh.getWritableDatabase();
 33 
 34         ContentValues cv=new ContentValues();
 35 
 36         cv.put("name",tongxunlu.getName());
 37 
 38         cv.put("phone_number",tongxunlu.getPhone_number());
 39 
 40         rtn=sd.insert(TABLENAME,null,cv);
 41 
 42         sd.close();
 43         return rtn;
 44     }
 45 
 46     //删
 47     public int delete(long id)
 48     {
 49         int rtn=0;
 50 
 51         SQLiteDatabase sd=dh.getWritableDatabase();
 52 
 53         rtn=sd.delete(TABLENAME,"_id=?",new String[]{id+""});
 54 
 55         sd.close();
 56         return rtn;
 57     }
 58 
 59     //改
 60     public int updata(TongXunLu tongxunlu)
 61     {
 62         int rtn=0;
 63 
 64         SQLiteDatabase sd=dh.getWritableDatabase();
 65 
 66         ContentValues cv=new ContentValues();
 67 
 68         cv.put("name",tongxunlu.getName());
 69 
 70         cv.put("phone_number",tongxunlu.getPhone_number());
 71 
 72         rtn=sd.update(TABLENAME,cv,"_id=?",new String[]{tongxunlu.getId()+""});
 73 
 74         Log.e("TAG","rtn="+rtn);
 75 
 76         sd.close();
 77         return  rtn;
 78     }
 79     //查
 80     //返回查询结果
 81     public ArrayList<TongXunLu> getAll()
 82     {
 83         ArrayList<TongXunLu>  tongxunlus=new ArrayList<>();
 84 
 85         //连接数据库
 86         SQLiteDatabase sd=dh.getWritableDatabase();
 87 
 88         //查询之后得到游标结果集
 89         Cursor cursor=sd.query(TABLENAME, null, null, null, null, null, "_id desc");
 90 
 91         //遍历结果集
 92         while (cursor.moveToNext())
 93         {
 94             //1.把数据转成实体类的实例
 95             TongXunLu bl=new TongXunLu(cursor.getLong(0),cursor.getString(1),cursor.getString(2));
 96 
 97 
 98 
 99             tongxunlus.add(bl);
100 
101 
102         }
103 
104         cursor.close();
105 
106         sd.close();
107         return tongxunlus;
108     }
109 
110 }

  1 package com.example.administrator.myapplication;
  2 
  3 import android.app.AlertDialog;
  4 import android.content.DialogInterface;
  5 import android.support.v7.app.AppCompatActivity;
  6 import android.os.Bundle;
  7 import android.util.Log;
  8 import android.view.ContextMenu;
  9 import android.view.MenuItem;
 10 import android.view.View;
 11 import android.view.ViewGroup;
 12 import android.widget.AdapterView;
 13 import android.widget.BaseAdapter;
 14 import android.widget.EditText;
 15 import android.widget.ListView;
 16 import android.widget.Toast;
 17 
 18 import com.example.administrator.myapplication.com.wang.tongxunlu.orm.TongXunLu;
 19 import com.example.administrator.myapplication.com.wang.tongxunlu.orm.TongXunLuDAO;
 20 
 21 import java.util.ArrayList;
 22 
 23 public class MainActivity extends AppCompatActivity {
 24 
 25     ListView lv_1;
 26     //数据访问对象
 27     TongXunLuDAO tongXunLuDAO=new TongXunLuDAO(this);
 28     //数据集合
 29     ArrayList<TongXunLu> arrayList;
 30     MyAdapter myAdapter;
 31     int index;
 32 
 33     @Override
 34     protected void onCreate(Bundle savedInstanceState) {
 35         super.onCreate(savedInstanceState);
 36         setContentView(R.layout.activity_main);
 37         lv_1=(ListView)findViewById(R.id.lv_1);
 38         arrayList=tongXunLuDAO.getAll();
 39         myAdapter=new MyAdapter();
 40         lv_1.setAdapter(myAdapter);
 41         lv_1.setOnCreateContextMenuListener(this);
 42     }
 43 
 44     //增加
 45     public void bt_OnClick(View v)
 46     {
 47         final View view= View.inflate(this, R.layout.tongxunlu_activity, null);
 48         AlertDialog alertDialog=new AlertDialog.Builder(this)
 49                 .setTitle("添加联系人信息")
 50                 .setView(view)
 51                 .setPositiveButton("保存", new DialogInterface.OnClickListener() {
 52                     @Override
 53                     public void onClick(DialogInterface dialog, int which) {
 54                         EditText et_name=(EditText)view.findViewById(R.id.et_name);
 55                         EditText et_phone=(EditText)view.findViewById(R.id.et_phone);
 56                         TongXunLu tongXunLu=new TongXunLu(et_name.getText().toString(),
 57                                 et_phone.getText().toString());
 58                         long l=tongXunLuDAO.insert(tongXunLu);
 59 
 60                         if (l>0)
 61                         {
 62                             Toast.makeText(MainActivity.this, "添加成功", Toast.LENGTH_SHORT).show();
 63                         }
 64                         else
 65                         {
 66                             Toast.makeText(MainActivity.this, "添加失败", Toast.LENGTH_SHORT).show();
 67                         }
 68                         arrayList.add(0, tongXunLu);
 69                         myAdapter.notifyDataSetChanged();
 70                     }
 71                 })
 72                 .setNegativeButton("取消",null)
 73                 .show();
 74     }
 75 
 76     @Override
 77     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
 78         super.onCreateContextMenu(menu, v, menuInfo);
 79 
 80         menu.add(0, 1, 1, "修改");
 81         menu.add(0,2,2,"删除");
 82 
 83         AdapterView.AdapterContextMenuInfo m=(AdapterView.AdapterContextMenuInfo)menuInfo;
 84 
 85         index=m.position;
 86     }
 87 
 88     @Override
 89     public boolean onContextItemSelected(MenuItem item) {
 90 
 91         Log.e("TAG", "index="+index);
 92         switch (item.getItemId())
 93         {
 94             case 1:
 95                 //修改
 96                 View view= View.inflate(this, R.layout.tongxunlu_activity, null);
 97 
 98                 final EditText et_name=(EditText)view.findViewById(R.id.et_name);
 99                 et_name.setText(arrayList.get(index).getName());
100 
101                 final EditText et_phone=(EditText)view.findViewById(R.id.et_phone);
102                 et_phone.setText(arrayList.get(index).getPhone_number());
103 
104                 new AlertDialog.Builder(this)
105                         .setTitle("修改联系人信息")
106                         .setView(view)
107                         .setPositiveButton("修改", new DialogInterface.OnClickListener() {
108                             @Override
109                             public void onClick(DialogInterface dialog, int which) {
110 
111                                 TongXunLu tongxunlu = arrayList.get(index);
112 
113                                 tongxunlu.setName(et_name.getText().toString());
114                                 tongxunlu.setPhone_number(et_phone.getText().toString());
115 
116                                 if (tongXunLuDAO.updata(tongxunlu) > 0)
117                                 {
118                                     Toast.makeText(MainActivity.this, "修改成功", Toast.LENGTH_SHORT).show();
119                                 }
120                                 else
121                                 {
122                                     Toast.makeText(MainActivity.this, "修改失败", Toast.LENGTH_SHORT).show();
123                                 }
124                             }
125                         })
126                         .setNegativeButton("取消", null)
127                         .show();
128                 break;
129             case 2:
130                 //删除
131                 new  AlertDialog.Builder(this)
132                         .setTitle("确定要删除？")
133                         .setPositiveButton("确定", new DialogInterface.OnClickListener() {
134                             @Override
135                             public void onClick(DialogInterface dialog, int which) {
136                                 //删除
137                                 if ( tongXunLuDAO.delete(arrayList.get(index).getId())>0)
138                                 {
139                                     Toast.makeText(MainActivity.this, "删除成功", Toast.LENGTH_SHORT).show();
140                                     //更新List
141                                     arrayList.remove(index);
142                                 }
143                                 else
144                                 {
145                                     Toast.makeText(MainActivity.this, "删除失败", Toast.LENGTH_SHORT).show();
146                                 }
147                             }
148                         })
149                         .setNegativeButton("取消",null)
150                         .show();
151                 break;
152         }
153         return super.onContextItemSelected(item);
154     }
155     class MyAdapter extends BaseAdapter
156     {
157         @Override
158         public int getCount() {
159             return arrayList.size();
160         }
161 
162         @Override
163         public Object getItem(int position) {
164             return arrayList.get(position);
165         }
166 
167         @Override
168         public long getItemId(int position) {
169             return arrayList.get(position).getId();
170         }
171 
172         @Override
173         public View getView(int position, View convertView, ViewGroup parent) {
174 
175             TongXunLu tongXunLu=arrayList.get(position);
176 
177             if (convertView==null)
178             {
179                 convertView=View.inflate(MainActivity.this,R.layout.tongxunlu_activity,null);
180             }
181 
182             EditText editText=(EditText)convertView.findViewById(R.id.et_name);
183 
184             editText.setText(tongXunLu.getName());
185 
186             EditText editText1=(EditText)convertView.findViewById(R.id.et_phone);
187 
188             editText1.setText(tongXunLu.getPhone_number());
189 
190             return convertView;
191         }
192     }
193 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent">
 6     <LinearLayout
 7         android:layout_width="match_parent"
 8         android:layout_height="wrap_content">
 9         <TextView
10             android:layout_width="wrap_content"
11             android:layout_height="wrap_content"
12             android:text="姓名:"
13             android:id="@+id/tv_name"/>
14         <EditText
15             android:layout_width="match_parent"
16             android:layout_height="wrap_content"
17             android:id="@+id/et_name"/>
18     </LinearLayout>
19     <LinearLayout
20         android:layout_width="match_parent"
21         android:layout_height="wrap_content">
22         <TextView
23             android:layout_width="wrap_content"
24             android:layout_height="wrap_content"
25             android:text="电话:"
26             android:id="@+id/tv_phone"/>
27         <EditText
28             android:layout_width="match_parent"
29             android:layout_height="wrap_content"
30             android:id="@+id/et_phone"/>
31     </LinearLayout>
32 
33 </LinearLayout>