android - 在水平回收机 View 中捕捉

我有一个水平回收视图，我想启用捕捉。我阅读了so上的一些线程，发现this代码运行得非常好。我不太了解Recycler视图和布局管理器的内部工作原理，因此想询问是否可以将代码修改为：
不管投掷的速度如何，我只想向前或向后移动一个项目。
弹速很慢。如果我移动视图超过一半的宽度，下一个项目进入中心，但非常缓慢。可以增加这个值使快照立即生效吗？
任何关于如何实现上述行为的想法都会非常有帮助。

最佳答案

最后在其他代码的帮助下解决了这个问题：

public class FlingRecyclerView extends RecyclerView {

    int screenWidth;

    public FlingRecyclerView(Context context) {
        super(context);
        WindowManager windowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
        Display display = windowManager.getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        screenWidth = size.x;
    }

    public FlingRecyclerView(Context context, AttributeSet attrs) {
        super(context, attrs);
        WindowManager windowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
        Display display = windowManager.getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        screenWidth = size.x;
    }

    public FlingRecyclerView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        WindowManager windowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
        Display display = windowManager.getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        screenWidth = size.x;
    }

    @Override
    public boolean fling(int velocityX, int velocityY) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) getLayoutManager();

//these four variables identify the views you see on screen.
        int lastVisibleView = linearLayoutManager.findLastVisibleItemPosition();
        int firstVisibleView = linearLayoutManager.findFirstVisibleItemPosition();
        View firstView = linearLayoutManager.findViewByPosition(firstVisibleView);
        View lastView = linearLayoutManager.findViewByPosition(lastVisibleView);

//these variables get the distance you need to scroll in order to center your views.
//my views have variable sizes, so I need to calculate side margins separately.
//note the subtle difference in how right and left margins are calculated, as well as
//the resulting scroll distances.


        int leftMargin = (screenWidth - lastView.getWidth()) / 2;
        int rightMargin = (screenWidth - firstView.getWidth()) / 2 + firstView.getWidth();
        int leftEdge = lastView.getLeft();
        int rightEdge = firstView.getRight();
        int scrollDistanceLeft = leftEdge - leftMargin;
        int scrollDistanceRight = rightMargin - rightEdge;

//if(user swipes to the left)
        if (velocityX > 0) smoothScrollBy(scrollDistanceLeft, 0);
        else smoothScrollBy(-scrollDistanceRight, 0);

        return true;
    }
}

非常适合我的要求。希望对别人也有帮助。

关于android - 在水平回收机 View 中捕捉，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/33032672/