android_75_ContentObserver_短信内容观察者

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package com.sg31.contentobserver;import android.support.v7.app.ActionBarActivity;import android.content.ContentResolver;import android.database.ContentObserver;import android.net.Uri;import android.os.Bundle;import android.os.Handler;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends ActionBarActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);// 注册内容观察者registerContentObserver();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}public void registerContentObserver() {// 注册一个内容观察者，监听短信数据库内容的改变ContentResolver cr = getContentResolver();// uri:监听哪个uri上的内容提供者的通知// notifyForDescendents:如果是true，那么只要以content://sms开头的uri的数据改变，都能收到通知，比如content://sms/inboxcr.registerContentObserver(Uri.parse("content://sms"), true,new SGObserver(new Handler()));}class SGObserver extends ContentObserver {public SGObserver(Handler handler) {super(handler);}// 收到数据改变的通知，此方法调用@Overridepublic void onChange(boolean selfChange) {// TODO Auto-generated method stubsuper.onChange(selfChange);System.out.println("短信数据库改变");}}}
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