android_75_ContentObserver_短信内容观察者

效果:

 

 

清单:

 

 

布局:

 

 

代码:

 

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 {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		// 注册内容观察者
		registerContentObserver();
	}

	@Override
	public 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;
	}

	@Override
	public 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/inbox
		cr.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
		@Override
		public void onChange(boolean selfChange) {
			// TODO Auto-generated method stub
			super.onChange(selfChange);
			System.out.println("短信数据库改变");
		}

	}

}