Android -- 内容观察者_移动开发_编程开发_程序员俱乐部

一张图了解内容观察者：

背景                                                                                         

通过发送一条短信，然后手机接收到，那么数据库必然改变，内容观察者这时候就起作用了。

程序                                                                                         

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        ContentResolver resolver = getContentResolver();
        Uri uri = Uri.parse("content://sms/");
        //注册
        resolver.registerContentObserver(uri, true, new MyObserver(new Handler()));                   
    }
    
    class MyObserver extends ContentObserver
    {

        public MyObserver(Handler handler) {
            super(handler);            
        }

        //当内容观察者观察到数据库的内容发生了变化就会调用这个方法
        //观察到消息邮箱里有一条数据库内容变化的通知
        @Override
        public void onChange(boolean selfChange) {
            super.onChange(selfChange);
            Toast.makeText(MainActivity.this, "数据库的内容发生了变化", Toast.LENGTH_LONG).show();
            Uri uri = Uri.parse("content://sms/");
            ContentResolver resolver = getContentResolver();
            Cursor cursor = resolver.query(uri, new String[]{"address" ,"date", "type", "body"}, null, null, null);
            cursor.moveToFirst();
            String address = cursor.getString(cursor.getColumnIndex("address"));
            String body = cursor.getString(cursor.getColumnIndex("body"));
            System.out.println("address"+address+"+++++++body:"+body);
            cursor.close();
        }                  
    }    
}

效果                                                                                          

注意一下短信的读取的权限哈！！

我是天王盖地虎的分割线                                                                

源代码：http://pan.baidu.com/s/1dD1Qx01

内容观察者.zip

转载请注明出处：http://www.cnblogs.com/yydcdut