android - Check if device is plugged in

Question

My app has a broadcast receiver to listen for changes to ACTION_POWER_CONNECTED, and in turn flag the screen to stay on.

What I am missing is the ability for the app to check the charging status when it first runs. Can anyone please help me with code to manually check charging status?

Answer 1

Thanks to CommonsWare here is the code I wrote.

public class Power {
    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 || plugged == BatteryManager.BATTERY_PLUGGED_WIRELESS;
    }
}

if (Power.isConnected(context)) {
    ...
}

or the Kotlin version

object Power {
    fun isConnected(context: Context): Boolean {
        val intent = context.registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
        val plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1)
        return plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB || plugged == BatteryManager.BATTERY_PLUGGED_WIRELESS
    }
}

http://developer.android.com/training/monitoring-device-state/battery-monitoring.html