Checking for Power Saver Mode programmatically

Question

I have written an app (AutoWifiSwitch) and one of the features I plan to add is automatically disabling the wifi scanning service in my app if power saving mode is enabled.<

Answer 1

I've eventually figured out how to do this with HTC and Samsung devices. Both store their power manager settings in Settings.System.

HTC (Sense) uses the key user_powersaver_enable. Samsung (Touchwiz) uses the key psm_switch.

Both store the boolean as a String, "0" being false and "1" being true. You can then listen for changes using a ContentObserver like so (requires API level 16 or higher):

getContentResolver().registerContentObserver(Settings.System.CONTENT_URI, true, new ContentObserver(){
  @Override
  public void onChange(boolean selfChange, Uri uri){
    super.onChange(selfChange, uri);
    String key = uri.getPath();
    key = key.substring(key.lastIndexOf("/") + 1, key.length());

    if (key.equals("user_powersaver_enable") || key.equals("psm_switch")){
      boolean batterySaverEnabled = Settings.System.getString(getContentResolver(), key).equals("1");
      // do something
    }
  }
});

However this will only be applicable until Android L is release, when L is released HTC and Samsung will likely move over to the AOSP battery saver which means you will be able to use the new battery saver api in L.