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：

 package com.example.simplecursoradapter;

 import android.app.Activity;
 import android.content.Intent;
 import android.database.Cursor;
 import android.database.CursorWrapper;
 import android.graphics.Color;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.Contacts.People;
 import android.telephony.PhoneNumberUtils;
 import android.util.Log;
 import android.view.View;
 import android.widget.AdapterView;
 import android.widget.LinearLayout;
 import android.widget.ListAdapter;
 import android.widget.ListView;
 import android.widget.SimpleCursorAdapter;

 public class MainActivity extends Activity {
     private static final String TAG = "MainActivity";
     ListView listView;
     ListAdapter adapter;

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         LinearLayout linearLayout = new LinearLayout(this);
         linearLayout.setOrientation(LinearLayout.VERTICAL);

         LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
                 LinearLayout.LayoutParams.FILL_PARENT,
                 LinearLayout.LayoutParams.WRAP_CONTENT);

         listView = new ListView(this);
         linearLayout.addView(listView, param);
         this.setContentView(linearLayout);

         // 从数据库获取联系人姓名和电话号码
         Cursor cur = this.getContentResolver().query(People.CONTENT_URI, null,
                 null, null, null);
         adapter = new SimpleCursorAdapter(this,
                 android.R.layout.simple_list_item_2, cur, new String[] {
                         People.NAME, People.NUMBER }, new int[] {
                         android.R.id.text1, android.R.id.text2 });
         this.startManagingCursor(cur);
         listView.setAdapter(adapter);

         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

             public void onItemClick(AdapterView<?> arg0, View arg1,
                     int position, long arg3) {

                 // names=((CursorWrapper)listView.getItemAtPosition(position)).getColumnNames();
                 // 从指针的封装类中获得选中项的电话号码并拨号
                 CursorWrapper wrapper = (CursorWrapper) listView
                         .getItemAtPosition(position);
                 int columnIndex = wrapper.getColumnIndex(People.NUMBER);
                 if (!wrapper.isNull(columnIndex)) {
                     String number = wrapper.getString(columnIndex);
                     Log.d(TAG, "number=" + number);
                     // 判断电话号码的有效性
                     if (PhoneNumberUtils.isGlobalPhoneNumber(number)) {
                         Intent intent = new Intent(Intent.ACTION_DIAL, Uri
                                 .parse("tel://" + number));
                         startActivity(intent);
                     }
                 }
             }
         });
     }
 }

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" />