protected static Boolean isCharging ( Context ctx ) { try { Intent intent = ctx . registerReceiver ( null , new IntentFilter ( Intent . ACTION_BATTERY_CHANGED ) ) ; if ( intent == null ) { return null ; } int plugged = intent . getIntExtra ( BatteryManager . EXTRA_PLUGGED , - 1 ) ; return plugged == BatteryManager . BATTERY_PLUGGED_AC || plugged == BatteryManager . BATTERY_PLUGGED_USB ; } catch ( Exception e ) { Log . e ( TAG , "Error getting device charging state." , e ) ; return null ; } }
Checks whether or not the device is currently plugged in and charging or null if unknown .