如何最好地处理一扔手势为Android ListActivity [英] How to best handle fling gesture for Android ListActivity

问题描述

我有一个 ListActivity 在主视图中的Andr​​oid应用程序。该列表包含一个的LinearLayout 与的TextView 和隐藏的删除按钮。删除按钮将被默认隐藏。我想用一个一扔姿态展现的按钮。我能够检测一扔手势感谢质疑＃ 937313 的计算器。这不是我清楚如何确定哪些项目在列表中被扔，因为onTouch监听器监听的ListView 。该项目不一定选择成getSelected *方法不能可靠地使用。我现在用的是 SimpleListAdaptor 所以我没有直接访问查看对象的的ListView 。

I have an Android app with a ListActivity in the main view. The list contains a LinearLayout with a TextView and a hidden delete Button. The delete Button will be hidden by default. I want to use a fling gesture to show the button. I am able to detect the fling gesture thanks to question #937313 on stackoverflow. It's not clear to me how to determine which item in the list was flung, since the onTouch listener listens to the ListView. The item is not necessarily selected so getSelected* methods can't be used reliably. I am using the SimpleListAdaptor so I don't have direct access to the View Objects in the ListView.

任何想法？

推荐答案

尝试使用<一个href="http://developer.android.com/reference/android/widget/AbsListView.html#pointToPosition%28int,%20int%29"相对=nofollow> AbsListView.pointToPosition（）确定为X的列表项，Y在您的列表视图坐标。

Try using AbsListView.pointToPosition() to determine the list item for the X,Y coordinate in your list view.

如果您使用的是来自＃ 937313 的配方，你应该能够覆盖 onFling（ ）或多或少如下：

If you're using the recipe from #937313, you should be able to override onFling() more or less as follows:

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    try {
        Toast.makeText(listAdapter.getItem( listView.pointToPosition( (int) e1.getX(), (int) e1.getY() ).toString() );
        return super.onFling();
    } catch( Exception e ) {
        // do nothing
    }
}

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