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Added in API level 11

public static interface View.OnDragListener

android.view.View.OnDragListener

将拖动分派到此视图时调用回调的接口定义。回调将在托管视图自己的onDrag（event）方法之前被调用。如果侦听器想要回退到托管视图的onDrag（event）行为，它应该从该回调中返回'false'。

有关实现拖放功能的指南，请阅读 Drag and Drop开发人员指南。

Public methods
`abstract boolean`	`onDrag(View v, DragEvent event)` 当拖动事件被分派到视图时调用。

Added in API level 11

boolean onDrag (View v, 
                DragEvent event)

当拖动事件被分派到视图时调用。这允许监听者有机会覆盖基本的View行为。

Parameters
`v`	`View`: The View that received the drag event.
`event`	`DragEvent`: The `DragEvent` object for the drag event.

Returns
`boolean`	`true` if the drag event was handled successfully, or `false` if the drag event was not handled. Note that `false` will trigger the View to call its `onDragEvent()` handler.