returning_the_battery_level.js

// Get battery level.
  static Future<String> getBatteryLevel() async {
    String batteryLevel;
    try {
      final int result = await _channel.invokeMethod('getBatteryLevel');
      batteryLevel = 'Battery level: $result%.';
    } on PlatformException {
      batteryLevel = 'Failed to get battery level.';
    }
    return batteryLevel;
  }
}