回弹效果listview

本文介绍了一个自定义的ListView组件——BounceListView,该组件通过重写过滚行为实现了平滑的反弹效果。它根据屏幕密度调整最大过滚距离,确保不同设备上具有一致的用户体验。
public class ReboundListview 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);    
    }  

}  
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值