Android power save mode listener?

Question

How can an Android listener be created to perform a task just before entering power save mode? Also: what are some of the low power options that can be controlled by this task?

score 19 · Accepted Answer · edited Jun 20 '20 at 09:12

19

The answer above(for API 21 and above) is not exactly right. You should register a receiver in your activity or service like this:

BroadcastReceiver powerSaverChangeReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        checkPowerSaverMode();
    }
 };

IntentFilter filter = new IntentFilter();
filter.addAction("android.os.action.POWER_SAVE_MODE_CHANGED");
registerReceiver(powerSaverChangeReceiver, filter);

The reason for this is that receivers in manifest are not triggered by this broadcast.

ACTION_POWER_SAVE_MODE_CHANGED

Intent that is broadcast when the state of isPowerSaveMode() changes. This broadcast is only sent to registered receivers.

I have tested this and it works.

edited Jun 20 '20 at 09:12

Community

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answered Aug 09 '16 at 20:21

user6697486

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Is there a way to simply check if device is in power save mode? – jmrodrigg Jan 20 '17 at 10:34
@jmrodrigg you can just use ```PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE); boolean powerSave == m.isPowerSaveMode(); ``` – nattster Jan 24 '17 at 15:22
@nattster Thanks! – jmrodrigg Feb 02 '17 at 09:41

score 7 · Answer 2 · edited Feb 11 '16 at 16:15

Since Lollipop (API 21) there is PowerManager#ACTION_POWER_SAVE_MODE_CHANGED broadcast intent.

So you need just to receive it:

AndroidManifest.xml:

<receiver android:name=".observers.PowerSaveModeReceiver">
    <intent-filter>
        <action android:name="android.os.action.POWER_SAVE_MODE_CHANGED"/> 
    </intent-filter>
</receiver>

PowerSaveModeReceiver.java:

public class PowerSaveModeReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(final Context context, final Intent intent) {
        if (BuildConfig.DEV_LOGS)
            Log.d(this.getClass().getName(), String.format("onReceive(context = [%s], intent = [%s])", context, intent));

        final PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
        if (pm.isPowerSaveMode()) {
            // do something
        } else {
            // do some else
        }
    }
}

Does it work for you? It is written in the docs "This broadcast is only sent to registered receivers." ... — android developer, Aug 30 '17 at 11:52

score 1 · Answer 3 · answered Nov 09 '10 at 22:58

1

How can an Android listener be created to perform a task just before entering power save mode?

There is no broadcast Intent for this. The closest is ACTION_SCREEN_OFF. The device will likely fall asleep in the near future after you receive this broadcast. And, you can only listen for this broadcast using a BroadcastReceiver registered via registerReceiver() in an activity or service or other Context.

Also: what are some of the low power options that can be controlled by this task?

I have no idea what this means, sorry.

answered Nov 09 '10 at 22:58

CommonsWare

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Screen off is one part of power save that can be disabled in Settings > Applications > Development. Can other power save functions such as closing the microSD card interface be controlled by an application? – jacknad Nov 10 '10 at 12:11
@JackN: I am unclear what you think "closing the microSD card interface" is. Please see `android.provider.Settings.System` for the sorts of things you can control. Beyond that list, there is nothing power-related I can think of along the lines you seem to be interested in. – CommonsWare Nov 10 '10 at 13:21

Android power save mode listener?

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