BroadcastReceiver广播接收者(六)——粘性广播(StickyBroadcast)使用示例

MainActivity如下:

package cc.com;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
/**
 * Demo描述:
 * 粘性广播(StickyBroadcast)使用示例
 * 粘性广播也叫等待广播.
 *
 * 使用场景:
 * 发送一个粘性广播(StickyBroadcast),但是现在并没有一个广播接收者来接收该广播发出的数据.
 * 而是在某个时间后,才注册一个receiver,但是也能收到之前StickyBroadcast发出的广播.
 * 这点就和平常用的普通广播很不一样了.
 *
 * 在该示例中:
 * 1 发出一个粘性广播(StickyBroadcast)
 * 2 5秒后再启动一个Activity
 * 3 在新启动的Activity中注册receiver接收StickyBroadcast发出的数据
 *
 * 参考资料:
 * 1 http://blog.csdn.net/lamp_zy/article/details/9324979
 * 2 http://blog.csdn.net/woaieillen/article/details/7376391
 *
 * 注意权限:
 * <uses-permission android:name="android.permission.BROADCAST_STICKY"/>
 */
public class MainActivity extends Activity {
    private Context mContext;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		mContext=this;
		sendStickyBroadcastTest();
		startAnotherActivity();
	}

	//发送粘性广播
	private void sendStickyBroadcastTest() {
		Intent intent=new Intent();
		intent.setAction("cc.vv");
		intent.putExtra("time", String.valueOf(System.currentTimeMillis()));
        sendStickyBroadcast(intent);
	}

	// 启动其他Activity
	private void startAnotherActivity() {
		new Thread() {
			public void run() {
				try {
					Thread.sleep(1000*5);
					Intent intent=new Intent(mContext, AnotherActivity.class);
					mContext.startActivity(intent);
				} catch (Exception e) {
					// TODO: handle exception
				}
			}
		}.start();

	}

}

AnotherActivity如下:

package cc.com;

import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

public class AnotherActivity extends Activity {
    private BroadcastReceiver mBroadcastReceiver=null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.another);
		registBroadcastReceiver();
	}

	//注册广播接收者
	private void registBroadcastReceiver(){
		mBroadcastReceiver=new BroadcastReceiver() {
			@Override
			public void onReceive(Context context, Intent intent) {
				System.out.println("收到了StickyBroadcast发出的数据");
				String time=intent.getStringExtra("time");
				System.out.println("发送广播的时间:"+time);
				System.out.println("当前的时间:"+System.currentTimeMillis());
			}
		};
		IntentFilter intentFilter=new IntentFilter();
		intentFilter.addAction("cc.vv");
		registerReceiver(mBroadcastReceiver, intentFilter);
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		if (mBroadcastReceiver!=null) {
			unregisterReceiver(mBroadcastReceiver);
		}
	}

}

PS：两个界面布局简单得令人发指，所以不再贴出。

PPS：在电量变化的时候系统也会发出sticky广播；参考资料：http://blog.csdn.net/jaysong2012/article/details/45601001