launch method
Implementation
Future<Null> launch(String path, {Rect? rect}) async {
final args = <String, dynamic>{'path': path};
if (rect != null) {
args['rect'] = {
'left': rect.left,
'top': rect.top,
'width': rect.width,
'height': rect.height
};
}
await _channel.invokeMethod('launch', args);
}