BroadcastReceiver in activity

Question

I want to change the KeepScreenOn value of my activity, therefore I want to use an BroadcastReceiver inside the activity. I register the receiver in onCreate with:

registerReceiver(receiver, new IntentFilter("ACTION_POWER_CONNECTED"));
            registerReceiver(receiver, new IntentFilter("ACTION_POWER_DISCONNECTED"));

and unregister it in onPause:

unregisterReceiver(receiver);

The receiver looks like this:

    private BroadcastReceiver receiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(Intent.ACTION_POWER_CONNECTED)) {
            findViewById(R.id.fullscreen_content).setKeepScreenOn(true);
        } else if (action.equals(Intent.ACTION_POWER_DISCONNECTED)) {
            media=MediaPlayer.create(context,R.raw.battery);
            media.start();
            findViewById(R.id.fullscreen_content).setKeepScreenOn(false);
        }
    }
};

No errors, it simply does not change anything when disconnecting/connecting to power source. Any suggestions?

"But it is not working at all", then what is happening ? any error/exception ? — Jibran Khan, Oct 30 '14 at 10:57
no errors, it simply does not change anything when disconnecting/connecting to power source. — M P, Oct 30 '14 at 11:00
Have you tried to debug to check whether it is executing the receiver block ? — Jibran Khan, Oct 30 '14 at 11:00

score 2 · Accepted Answer · answered Oct 30 '14 at 11:09

2

You should use the defined constants, not string values :

IntentFilter(Intent.ACTION_POWER_CONNECTED)

instead of :

IntentFilter("ACTION_POWER_CONNECTED")

answered Oct 30 '14 at 11:09

bwt

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Jibran Khan · Answer 2 · 2014-10-30T11:29:24.877

0

Have your registered Receiver actions in the AndroidManifest.xml ?

    <receiver android:name="com.app.example.firstapp.MyReceiver">
            <intent-filter>
                <action android:name="android.intent.action.SCREEN_OFF"></action>
                <action android:name="android.intent.action.SCREEN_ON"></action>
                <action android:name="android.intent.action.ACTION_POWER_CONNECTED"></action>
                <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"></action>
                 <action android:name="android.intent.action.ACTION_SHUTDOWN"></action>
            </intent-filter>
        </receiver>

Also do not forget to add the permission

<uses-permission android:name="android.permission.BATTERY_STATS"/>

edited Oct 30 '14 at 11:29

answered Oct 30 '14 at 11:02

Jibran Khan

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Do I have to register it in Manifest even if it is not a stand alone class? it is inside my activity. – M P Oct 30 '14 at 11:05
try to register all above actions through intent filter in receiver. – Jibran Khan Oct 30 '14 at 11:08

score 0 · Answer 3 · edited May 23 '17 at 12:27

Firstly set debug points in your receiver to see if it's actually firing

If it is not then:

I'm not sitting at my IDE now but I think this will not work because you register the same receiver with different filters, the second will overwrite the first action.

If you want one receiver to have multiple actions you should create a filter and add multiple actions to it using the IntentFilter addAction() method. Then when your receiver is called, you should use the Intent getAction() method to figure out which action has fired.

You should also probably only register your receiver in onStart or onResume.

If it is firing:

For keeping the screen on try the solution here: Keep Screen On Flag

BroadcastReceiver in activity

3 Answers3