Android broadcast receiver doesn't receive ACT

问题:

I tried to register the receiver in my service with the following code:

IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
ScreenReceiver SR = new ScreenReceiver();
registerReceiver(SR, filter);

and this is my broadcast receiver:

public class ScreenReceiver extends BroadcastReceiver { 
    @Override
    public void onReceive(Context context, Intent intent) {
        System.out.println("RECEIVED");
    }
}

I have even declared it in the manifest but without any filters:

<receiver android:name=".ScreenReceiver" android:enabled="true" />

But whatever I do, I can't seem to be able to receive the intent when I turn my screen on.

Is this intent disabled in android ICS or JB or am i missing something?

Any help would be appreciated!

回答1:

It's work for me on Android 4.0.4

BroadcastReceiver receiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent == null)
            return;
        //do something you need when broadcast received

    }
};
IntentFilter filter = new IntentFilter()
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);

context.registerReceiver(receiver, filter);

As for register receiver with action Intent.ACTION_SCREEN_ON and Intent.ACTION_SCREEN_OFF in Manifest.xml it don't help because Android code in PowerManagerService.java following:

...
mScreenOnIntent = new Intent(Intent.ACTION_SCREEN_ON);
mScreenOnIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
mScreenOffIntent = new Intent(Intent.ACTION_SCREEN_OFF);
mScreenOffIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 
...

回答2:

Read this tutorial Handling Screen OFF and Screen ON Intents, it could help you.

回答3:

Maybe you should check which intent is coming inside your onReceive() method:

if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)
{
    ...
}

Also, have you tried putting a breakpoint in there?

Other advice, instead of using System.out.println use the API native log which would be in your case

Log.i("ScreenReceiver""RECEIVED");

And you can read the log in the logcat.