BroadcastReceiver详解（二）——两种注册方式

摘要: BroadCast的注册方式有两种动态注册和静态注册

动态注册

特点：动态注册的广播的有效期与Activity或Service相同，当Activity或Service销毁后，动态注册的广播将不在存在。

注意：动态注册的广播一定要在Activity或Service内取消注册广播，如果不取消，Activity会保持引用，无法释放资源。

动态注册的方法

public abstract Intent registerReceiver (BroadcastReceiver receiver,IntentFilter filter)

Parameters

receiver	The BroadcastReceiver to handle the broadcast.
filter	Selects the Intent broadcasts to be received.

Returns

The first sticky intent found that matches filter, or null if there are none.

public abstract Intent registerReceiver (BroadcastReceiver receiver,IntentFilter filter, String broadcastPermission, Handler scheduler)

Parameters

receiver	The BroadcastReceiver to handle the broadcast.
filter	Selects the Intent broadcasts to be received.
broadcastPermission	String naming a permissions that a broadcaster must hold in order to send an Intent to you. If null, no permission is required.
scheduler	Handler identifying the thread that will receive the Intent. If null, the main thread of the process will be used.

Returns

The first sticky intent found that matches filter, or null if there are none.

动态注册取消的方法：

public abstract void unregisterReceiver (BroadcastReceiver receiver)

Parameters

receiver	The BroadcastReceiver to unregister

事例代码：

//onResum中注册
sdcardStateReceiver = new SdcardStateChanageReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_MEDIA_REMOVED);
filter.addAction(Intent.ACTION_MEDIA_EJECT);
filter.ad
3ff0
dAction(Intent.ACTION_MEDIA_MOUNTED);
filter.addDataScheme("file");
registerReceiver(sdcardStateReceiver, filter);

//onStop中取消注册
unregisterReceiver(sdcardStateReceiver);
}

静态注册

特点：永久存在，即使Application已经退出，注册也会有效。

注意:android3.1以后，首次安装未启动或者用户强制force stop后，应用无法监听到

实例代码：

<receiver android:name=".receiver.BootCompleteReceiver" >
<intent-filter android:priority="1000" >
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>