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?

Answer 1

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.