setVol static method

Future<double?> setVol(
  1. double vol
)

set system volume to vol. the range of vol is 0.0, 1,0. return the system volume value after set.

Implementation

static Future<double?> setVol(double vol) {
  if (vol < 0.0 || vol > 1.0) {
    return Future.error(
        ArgumentError.value(vol, "step must in range [0.0, 1.0]"));
  } else {
    return FijkPlugin._channel
        .invokeMethod("volumeSet", <String, dynamic>{'vol': vol});
  }
}