帮帮我！我想静音和取消静音按钮与洛蒂动画。但这个mute.json的json动画都有。所以我需要一个点击播放洛蒂半动画这样。当点击x1c 0d1x和

@override
  void initState() {
    super.initState();
    _controller = AnimationController(vsync: this)
      ..value = 0.5
      ..addListener(() {
        setState(() {
          // Rebuild the widget at each frame to update the "progress" label.
        });
      }); 
  }



     Column(
          children[
                   Lottie.asset( 
                                  controller: _controller,
                                  'assets/mute.json', 
                                  animate: true,
                                  onLoaded: (composition) {
                                       setState(() { 
                                      _controller.duration = composition.duration;
                                    });
                                  },
                                ),
],
),