1.界面代码
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 android:orientation="vertical" 8 tools:context="com.example.administrator.blacklist.MainActivity"> 9 10 <ListView 11 android:layout_width="match_parent" 12 android:layout_height="0dp" 13 android:layout_weight="1" 14 android:id="@+id/lv_1"> 15 </ListView> 16 <Button 17 android:layout_width="match_parent" 18 android:layout_height="wrap_content" 19 android:text="添加黑名单" 20 android:onClick="add_onclick"/> 21 </LinearLayout>
2.实体类代码
1 package com.example.administrator.blacklist.com.hanqi.blacklist;
2
3 /**
4 * Created by Administrator on 2016/06/06.
5 */
6
7 //实体类
8 public class BlackList {
9 private long id;
10 private String phoneNumber;
11 public long getId() {
12 return id;
13 }
14 public void setId(long id) {
15 this.id = id;
16 }
17 public String getPhoneNumber() {
18 return phoneNumber;
19 }
20 public void setPhoneNumber(String phoneNumber) {
21 this.phoneNumber = phoneNumber;
22 }
23 public BlackList(long id, String phoneNumber) {
24 this.id = id;
25 this.phoneNumber = phoneNumber;
26 }
27 public BlackList(String phoneNumber) {
28 this.phoneNumber = phoneNumber;
29 }
30 }
3.数据库代码
1 package com.example.administrator.blacklist.com.hanqi.blacklist;
2 import android.content.Context;
3 import android.database.sqlite.SQLiteDatabase;
4 import android.database.sqlite.SQLiteOpenHelper;
5 import android.util.Log;
6 /**
7 * Created by Administrator on 2016/06/07.
8 */
9 public class DBHelper extends SQLiteOpenHelper {
10 public DBHelper(Context context) {
11 super(context, "blacklist.db", null, 1);
12 }
13 @Override
14 public void onCreate(SQLiteDatabase db) {
15 String sql = "CREATE TABLE t_blacklist " +
16 "(_id INTEGER NOT NULL," +
17 "phone_number VARCHAR(20) NOT NULL,"
18 +"PRIMARY KEY (\"_id\"))";
19 db.execSQL(sql);
20 Log.e("TAG", "表创建成功");
21 }
22 @Override
23 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
24 }
25 }
4.数据库操作代码【增删改查】
1 package com.example.administrator.blacklist.com.hanqi.blacklist;
2 import android.content.ContentValues;
3 import android.content.Context;
4 import android.database.Cursor;
5 import android.database.sqlite.SQLiteDatabase;
6 import java.util.ArrayList;
7 /**
8 * Created by Administrator on 2016/06/06.
9 */
10
11 //数据库操作类
12 public class BlackListDAO {
13 private Context context;
14 private DBHelper dbHelper;
15 private final String TABLE_NAME = "t_blacklist";
16 public BlackListDAO(Context context)
17 {
18 // this.context = context;
19 dbHelper=new DBHelper(context);
20 }
21 //增
22 //传入参数：实体类的实例
23 public long insert(BlackList blackList)
24 {
25 long rtn = 0;
26 //连接数据库
27 SQLiteDatabase sqLiteDatabase = dbHelper.getWritableDatabase();
28 //执行insert语句
29 //insert into t_balcklist(phone_number) values()
30 ContentValues contentValues = new ContentValues();
31 contentValues.put("phone_number", blackList.getPhoneNumber());
32 rtn = sqLiteDatabase.insert(TABLE_NAME, null, contentValues);
33 sqLiteDatabase.close();
34 return rtn;
35 }
36 //删
37 public int delete(long id)
38 {
39 SQLiteDatabase sqLiteDatabase = dbHelper.getWritableDatabase();
40 int rtn = 0;
41 // delete from t_blacklist where _id=?
42 rtn = sqLiteDatabase.delete(TABLE_NAME,"_id=?",new String[]{id+""});
43 sqLiteDatabase.close();
44 return rtn;
45 }
46 //改
47 public int update(BlackList blackList)
48 {
49 SQLiteDatabase sqLiteDatabase = dbHelper.getWritableDatabase();
50 ContentValues cv = new ContentValues();
51 cv.put("phone_number",blackList.getPhoneNumber().toString());
52 int rtn = 0;
53 //update语句 t_blacklist set phone_number = ? where _id = ?
54 rtn = sqLiteDatabase.update(TABLE_NAME,cv,"_id=?",new String[]{blackList.getId()+""});
55 sqLiteDatabase.close();
56 return rtn;
57 }
58 //查
59 //返回查询
60 public ArrayList<BlackList> getAll()
61 {
62 //连接数据库
63 SQLiteDatabase sqLiteDatabase = dbHelper.getWritableDatabase();
64 ArrayList<BlackList>blackLists = new ArrayList<>();
65 //select * from t_blacklist
66 //查询之后得到游标结果集
67 Cursor cursor = sqLiteDatabase.query(TABLE_NAME, null, null, null, null, null,"_id desc");
68 //遍历结果集
69 //1.把数据转成实体类的实例
70 while(cursor.moveToNext()) {
71 BlackList blacklist = new BlackList(cursor.getLong(0), cursor.getString(1));
72 //2.放在集合里，返回这个集合
73 blackLists.add(blacklist);
74 }
75 cursor.close();
76 sqLiteDatabase.close();
77 return blackLists;
78 }
79 }
5.操作代码
1 package com.example.administrator.myapplication;
2 import android.app.AlertDialog;
3 import android.content.DialogInterface;
4 import android.support.v7.app.AppCompatActivity;
5 import android.os.Bundle;
6 import android.text.InputType;
7 import android.view.ContextMenu;
8 import android.view.LayoutInflater;
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.Switch;
17 import android.widget.TextView;
18 import android.widget.Toast;
19 import com.example.administrator.myapplication.com.hanqi.blacklist.BlackList;
20 import com.example.administrator.myapplication.com.hanqi.blacklist.BlackListDAO;
21 import java.lang.reflect.Type;
22 import java.util.ArrayList;
23 import java.util.List;
24 import java.util.Map;
25 import java.util.Objects;
26
27 public class MainActivity extends AppCompatActivity {
28 ListView lv_1;
29 //数据访问对象
30 BlackListDAO blackListDAO = new BlackListDAO(this);
31 //数据集合
32 ArrayList<BlackList> alb;
33 BLAdapter blAdapter;
34 //长按数据的索引
35 int index;
36 @Override
37 protected void onCreate(Bundle savedInstanceState) {
38 super.onCreate(savedInstanceState);
39 setContentView(R.layout.activity_main);
40
41 lv_1=(ListView)findViewById(R.id.lv_1);
42 //增加上下文菜单 设置创建菜单的监听器
43 lv_1.setOnCreateContextMenuListener(this);
44 //获取数据集合
45 alb = blackListDAO.getAll();
46 //显示数据
47 lv_1.setAdapter(new BLAdapter());
48 }
49 //重写创建上下文菜单的方法
50 @Override
51 public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
52 super.onCreateContextMenu(menu, v, menuInfo);
53 menu.add(0, 1, 1, "修改");
54 menu.add(0, 2, 2, "删除");
55 //获取长按的数据信息
56 //1-得到菜单信息
57 AdapterView.AdapterContextMenuInfo acmi=(AdapterView.AdapterContextMenuInfo)menuInfo;
58 //2-得到数据在集合中的索引
59 index = acmi.position;
60 }
61 //响应菜单点击的回调方法
62 @Override
63 public boolean onContextItemSelected(MenuItem item) {
64 switch (item.getItemId())
65 {
66 case 1:
67 //修改
68 final EditText editText = new EditText(this);
69 editText.setHint("输入电话号码");
70 editText.setInputType(InputType.TYPE_CLASS_PHONE);
71 editText.setText(alb.get(index).getPhoneNumber());
72 new AlertDialog.Builder(this)
73 .setTitle("修改黑名单")
74 .setView(editText)
75 .setPositiveButton("保存", new DialogInterface.OnClickListener() {
76 @Override
77 public void onClick(DialogInterface dialog, int which) {
78 //1-得到新数据的实体类
79 //赋值
80 //1-传值，复制新的值再传递，值类型
81 //2-传址，传递的是内存地址，指向同一个对象，引用类型
82 BlackList blacklist = alb.get(index);
83 blacklist.setPhoneNumber(editText.getText().toString());
84 //2-调用DAO的update()
85 if (blackListDAO.update(blacklist)>0)
86 {
87 Toast.makeText(MainActivity.this, "修改成功", Toast.LENGTH_SHORT).show();
88 }
89 else
90 {
91 Toast.makeText(MainActivity.this, "修改失败", Toast.LENGTH_SHORT).show();
92 }
93 }
94 })
95 .setNeutralButton("取消", null)
96 .show();
97 break;
98 case 2:
99 //添加删除确认对话框
100 new AlertDialog.Builder(this)
101 .setTitle("确认对话框")
102 .setMessage("您确定删除该数据吗？")
103 .setPositiveButton("确认", new DialogInterface.OnClickListener() {
104 @Override
105 public void onClick(DialogInterface dialog, int which) {
106 if (blackListDAO.delete(alb.get(index).getId())>0)
107 {
108 Toast.makeText(MainActivity.this, "删除成功！", Toast.LENGTH_SHORT).show();
109 alb.remove(index);
110 }
111 else
112 {
113 Toast.makeText(MainActivity.this, "删除失败！", Toast.LENGTH_SHORT).show();
114 }
115 }
116 })
117 .setNegativeButton("取消", null)
118 .show();
119 }
120 return super.onContextItemSelected(item);
121 }
122
123 //baseadapter 实现类
124 class BLAdapter extends BaseAdapter
125 {
126 @Override
127 public int getCount() {
128 return alb.size();
129 }
130
131 @Override
132 public Object getItem(int position) {
133 return alb.get(position);
134 }
135
136 @Override
137 public long getItemId(int position) {
138 return alb.get(position).getId();
139 }
140
141 @Override
142 public View getView(int position, View convertView, ViewGroup parent) {
143 //得到数据
144 BlackList blackList = alb.get(position);
145 //得到视图
146 if (convertView==null)
147 {
148 //构建视图
149 convertView = new TextView(MainActivity.this);
150 }
151 //视图和数据做显示匹配
152 TextView textView = (TextView)convertView;
153 textView.setTextSize(20);
154 textView.setHeight(100);
155 textView.setText(blackList.getPhoneNumber());
156 return textView;
157 }
158 }
159 //添加按钮监听器
160 public void add_onclick(View v)
161 {
162 //自定义对话框
163 final EditText editText = new EditText(this);
164 editText.setHint("输入电话号码");
165 editText.setInputType(InputType.TYPE_CLASS_NUMBER);
166
167 //构建对话框
168 new AlertDialog.Builder(this)
169 .setTitle("添加黑名单")
170 .setView(editText)
171 .setCancelable(false)
172 .setNegativeButton("取消", null)
173 .setPositiveButton("保存", new DialogInterface.OnClickListener() {
174 @Override
175 public void onClick(DialogInterface dialog, int which) {
176 //向数据库保存 1-定义实体类
177 BlackList blacklist = new BlackList(editText.getText().toString());
178 //2-插入DAO数据
179 long l = blackListDAO.insert(blacklist);
180 if (l>0)
181 {
182 Toast.makeText(MainActivity.this, "电话号码保存成功！", Toast.LENGTH_SHORT).show();
183 //更新list
184 blacklist.setId(l);
185 alb.add(0,blacklist);
186 }
187 else
188 {
189 Toast.makeText(MainActivity.this, "电话号码保存失败！", Toast.LENGTH_SHORT).show();
190 }
191 }
192 })
193 .show();
194 }
195 }
6.自定义对话框代码
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout 3 xmlns:android="http://schemas.android.com/apk/res/android" 4 android:orientation="vertical" 5 android:layout_width="match_parent" 6 android:layout_height="match_parent"> 7 8 <EditText 9 android:layout_width="match_parent" 10 android:layout_height="wrap_content" 11 android:hint="输入手机号码" 12 android:id="@+id/b1" 13 android:layout_margin="16dp"/> 14 </LinearLayout>
时间： 2024-09-29 17:19:58