How to detect power connected state?

Question

Is there an easy way to be notified when USB or AC power is connected to an Android phone?

Answer 1

another way is using battery manager. this i usable for api>=21

public class PowerUtil {
    public static boolean isConnected(Context context) {
        Intent intent = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
        int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        return plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB;
    }
}