Android學習之適配器SimpleCursorAdapter

三.   SimpleCursorAdapter與SimpleAdapter用法相近。只是將List對象換成了Cursor對象。而且SimpleCursorAdapter類構造方法的第四個參數from表示Cursor對象中的字段，而SimpleAdapter類構造方法的第四個參數from表示Map對象中的key.

這個實例主要是查詢通訊錄，實現聯系人撥號實例：

1.java代碼：

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);

        // 從數據庫獲取聯系人姓名和電話號碼
        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();
                // 從指針的封裝類中獲得選中項的電話號碼並撥號
                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);
                    // 判斷電話號碼的有效性
                    if (PhoneNumberUtils.isGlobalPhoneNumber(number)) {
                        Intent intent = new Intent(Intent.ACTION_DIAL, Uri
                                .parse("tel://" + number));
                        startActivity(intent);
                    }
                }
            }
        });
    }
}

記得添加權限：

<!-- 點擊撥號時，詢問調用默認的程序還是調用本程序撥號 -->           
 <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" />