Android Get Current Battery Level

Get current battery level once on Android platform by using Battery_Changed Intent. This gets total scale value and current level to calculate.

public float getCurrentBatteryLevel() {
        Intent battery = registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
        
        int batteryLevel = battery.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        
        int batteryScale = battery.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

        //to avoid error use this
        if(batteryLevel == -1 || batteryScale == -1) {            
                return 50.0f;
        }

        return ((float)batteryLevel / (float)batteryScale) * 100.0f;
    }