永远不会调用 android ListView onOverScroll

Question

谁能告诉我为什么我不能在下面的代码中调用 onOverScrolled:

   public class KasOverScrollListenableListView extends ListView {

    public interface OverScrollListener{
        void onOverScroll(int scrollx, int scrollY,boolean clampedX, boolean clampedY );
    }
    private OverScrollListener mOverScrollListener= null;
    public KasOverScrollListenableListView(Context context, AttributeSet attrs,
            int defStyle) {
        super(context, attrs, defStyle);
    }

    public KasOverScrollListenableListView(Context context, AttributeSet attrs){
        this(context,attrs,0);
    }

    public KasOverScrollListenableListView(Context context){
        this(context,null,0);
    }

    protected void onOverScroll(int scrollX, int scrollY, boolean clampedX, boolean clampedY){
         Log.i("overScrolling", "overScrolling is " + scrollY);
        // if the version of the system higher than 2.3 then do the following things.
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD){
//          super.onOverScrolled(scrollX, scrollY, clampedX, clampedY);
            if(null != mOverScrollListener ){
                mOverScrollListener.onOverScroll(scrollX, scrollY, clampedX, clampedY);
            }
        }

    }

    public void setOnOverScrollListener(OverScrollListener listener){
        mOverScrollListener = listener;
    }
}

我永远无法输出日志，这意味着这个函数从未被调用过，而这个 ListView 实际上是过度滚动的。听到你的想法我将非常感激。

Answer 1

不确定这是否有帮助，但下面链接中的示例调用了 super.overScrollBy(...)。我可以使用此代码访问 onOverScroll。希望对您有所帮助...

OverScroll ListView Sample code