主要使用LongPressDraggable与DragTarget实现的万能遥控器交互效果。
Android 原生实现版本：RemoteControlView
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flutter 1.20 在DragTarget新增onAcceptWithDetails回调，目前对于本项目实现无作用。还是需要去修改源码实现。。。
发现flutter 2.0.0 在Draggable新增onDragUpdate回调、DragTarget新增onMove回调，基本可以满足此项目使用，但无法实现二次拖动。还是需要去修改源码实现。。。
修改源码部分有TODO标记，感兴趣可自行查看。
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