Android学习之适配器SimpleCursorAdapter

三.   SimpleCursorAdapter与SimpleAdapter用法相近。只是将List对象换成了Cursor对象。而且SimpleCursorAdapter类构造方法的第四个参数from表示Cursor对象中的字段，而SimpleAdapter类构造方法的第四个参数from表示Map对象中的key.

这个实例主要是查询通讯录，实现联系人拨号实例：

1.java代码：

 1 package com.example.simplecursoradapter;
 2
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.database.Cursor;
 6 import android.database.CursorWrapper;
 7 import android.graphics.Color;
 8 import android.net.Uri;
 9 import android.os.Bundle;
10 import android.provider.Contacts.People;
11 import android.telephony.PhoneNumberUtils;
12 import android.util.Log;
13 import android.view.View;
14 import android.widget.AdapterView;
15 import android.widget.LinearLayout;
16 import android.widget.ListAdapter;
17 import android.widget.ListView;
18 import android.widget.SimpleCursorAdapter;
19
20
21 public class MainActivity extends Activity {
22     private static final String TAG = "MainActivity";
23     ListView listView;
24     ListAdapter adapter;
25
26     @Override
27     public void onCreate(Bundle savedInstanceState) {
28         super.onCreate(savedInstanceState);
29
30         LinearLayout linearLayout = new LinearLayout(this);
31         linearLayout.setOrientation(LinearLayout.VERTICAL);
32
33         LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
34                 LinearLayout.LayoutParams.FILL_PARENT,
35                 LinearLayout.LayoutParams.WRAP_CONTENT);
36
37         listView = new ListView(this);
38         linearLayout.addView(listView, param);
39         this.setContentView(linearLayout);
40
41         // 从数据库获取联系人姓名和电话号码
42         Cursor cur = this.getContentResolver().query(People.CONTENT_URI, null,
43                 null, null, null);
44         adapter = new SimpleCursorAdapter(this,
45                 android.R.layout.simple_list_item_2, cur, new String[] {
46                         People.NAME, People.NUMBER }, new int[] {
47                         android.R.id.text1, android.R.id.text2 });
48         this.startManagingCursor(cur);
49         listView.setAdapter(adapter);
50
51         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
52
53             public void onItemClick(AdapterView<?> arg0, View arg1,
54                     int position, long arg3) {
55
56                 // names=((CursorWrapper)listView.getItemAtPosition(position)).getColumnNames();
57                 // 从指针的封装类中获得选中项的电话号码并拨号
58                 CursorWrapper wrapper = (CursorWrapper) listView
59                         .getItemAtPosition(position);
60                 int columnIndex = wrapper.getColumnIndex(People.NUMBER);
61                 if (!wrapper.isNull(columnIndex)) {
62                     String number = wrapper.getString(columnIndex);
63                     Log.d(TAG, "number=" + number);
64                     // 判断电话号码的有效性
65                     if (PhoneNumberUtils.isGlobalPhoneNumber(number)) {
66                         Intent intent = new Intent(Intent.ACTION_DIAL, Uri
67                                 .parse("tel://" + number));
68                         startActivity(intent);
69                     }
70                 }
71             }
72         });
73     }
74 }

记得添加权限：

<!-- 点击拨号时，询问调用默认的程序还是调用本程序拨号 -->
 <intent-filter>
     <action android:name="android.Intent.Action.CALL_BUTTON" />

     <category android:name="android.Intent.Category.DEFAULT" />
</intent-filter>

<uses-permission android:name="android.permission.READ_CONTACTS" />