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：

内容观察者.zip

 

 

 

 

转载请注明出处：