requestPermissionIfNecessary method

@override Future<bool> requestPermissionIfNecessary()

动态请求相关权限（仅 Android）

Implementation

@override
Future<bool> requestPermissionIfNecessary() async {
  if (Platform.isAndroid) {
    final bool result =
        await methodChannel.invokeMethod('requestPermissionIfNecessary');
    return result;
  }
  return true;
}