Android: Listview 弹跳到 scrollview

Question

有什么方法可以将 ListView 的弹跳效果添加到常规 ScrollView 中？我所说的弹跳是指当您击中列表底部时产生的类似橡皮筋的效果。

Answer 1

在android中给listview添加弹跳效果

第 1 步:在包 com.base.view 中创建新文件 BounceListView

public class BounceListView extends ListView
{
    private static final int MAX_Y_OVERSCROLL_DISTANCE = 200;

    private Context mContext;
    private int mMaxYOverscrollDistance;

    public BounceListView(Context context) 
    {
        super(context);
        mContext = context;
        initBounceListView();
    }

    public BounceListView(Context context, AttributeSet attrs) 
    {
        super(context, attrs);
        mContext = context;
        initBounceListView();
    }

    public BounceListView(Context context, AttributeSet attrs, int defStyle) 
    {
        super(context, attrs, defStyle);
        mContext = context;
        initBounceListView();
    }

    private void initBounceListView()
    {
        //get the density of the screen and do some maths with it on the max overscroll distance
        //variable so that you get similar behaviors no matter what the screen size

        final DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();
            final float density = metrics.density;

        mMaxYOverscrollDistance = (int) (density * MAX_Y_OVERSCROLL_DISTANCE);
    }

    @Override
    protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) 
    { 
        //This is where the magic happens, we have replaced the incoming maxOverScrollY with our own custom variable mMaxYOverscrollDistance; 
        return super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, maxOverScrollX, mMaxYOverscrollDistance, isTouchEvent);  
    }

}

第 2 步:在您的布局中，请更改

<ListView 
   android:id="@+id/list"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
/>

到

<com.base.view.BounceListView 
   android:id="@+id/list"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
/>