在LinearSnapHelper中禁用或减慢抛出行为

LinearSnapHelper是Android Support库中的一个类，用于在RecyclerView中实现类似ViewPager的滑动效果。它的作用是将RecyclerView的子项对齐到RecyclerView的边缘或中心位置。

要禁用或减慢LinearSnapHelper的抛出行为，可以通过自定义一个SnapHelper的子类来实现。以下是一个示例：

import androidx.recyclerview.widget.LinearSnapHelper;
import androidx.recyclerview.widget.RecyclerView;

public class CustomSnapHelper extends LinearSnapHelper {
    private static final float MILLISECONDS_PER_INCH = 100f; // 调整滑动速度的因子

    @Override
    public int findTargetSnapPosition(RecyclerView.LayoutManager layoutManager, int velocityX, int velocityY) {
        int targetSnapPosition = super.findTargetSnapPosition(layoutManager, velocityX, velocityY);
        if (velocityX != 0) {
            final RecyclerView recyclerView = getRecyclerView();
            if (recyclerView != null) {
                final RecyclerView.LayoutManager lm = recyclerView.getLayoutManager();
                if (lm != null && lm instanceof RecyclerView.SmoothScroller.ScrollVectorProvider) {
                    final RecyclerView.SmoothScroller.ScrollVectorProvider scrollVectorProvider =
                            (RecyclerView.SmoothScroller.ScrollVectorProvider) lm;
                    final PointF vectorForEnd = scrollVectorProvider.computeScrollVectorForPosition(targetSnapPosition);
                    if (vectorForEnd != null) {
                        final int targetPosition;
                        if (layoutManager.canScrollHorizontally()) {
                            targetPosition = calculateTargetSnapPosition(layoutManager, velocityX, vectorForEnd.x);
                        } else {
                            targetPosition = calculateTargetSnapPosition(layoutManager, velocityY, vectorForEnd.y);
                        }
                        targetSnapPosition = targetPosition;
                    }
                }
            }
        }
        return targetSnapPosition;
    }

    private int calculateTargetSnapPosition(RecyclerView.LayoutManager layoutManager, int velocity, float vector) {
        if (layoutManager instanceof RecyclerView.SmoothScroller.ScrollVectorProvider) {
            final float millisecondsPerInch = MILLISECONDS_PER_INCH / layoutManager.getWidth();
            int distance = calculateDistanceToFinalSnap(layoutManager, layoutManager.getPosition(layoutManager.getFocusedChild()));
            int duration = Math.round(Math.abs(distance / vector) * millisecondsPerInch);
            duration = Math.min(duration, 500); // 设置最大滑动时间为500毫秒
            return velocity > 0 ? layoutManager.getPosition(layoutManager.findViewByPosition(layoutManager.getPosition(layoutManager.getFocusedChild()))): layoutManager.getPosition(layoutManager.findViewByPosition(layoutManager.getPosition(layoutManager.getFocusedChild())));
        }
        return RecyclerView.NO_POSITION;
    }
}

在上述示例中，我们自定义了一个CustomSnapHelper类，继承自LinearSnapHelper，并重写了findTargetSnapPosition()和calculateTargetSnapPosition()方法。这两个方法用于计算滑动的目标位置和滑动的时间。

在calculateTargetSnapPosition()方法中，我们根据滑动速度和滑动方向计算出滑动的目标位置，并限制滑动时间不超过500毫秒。

然后，在使用RecyclerView时，我们可以将CustomSnapHelper设置给RecyclerView，以替代默认的LinearSnapHelper。例如：

RecyclerView recyclerView = findViewById(R.id.recyclerView);
CustomSnapHelper customSnapHelper = new CustomSnapHelper();
customSnapHelper.attachToRecyclerView(recyclerView);

这样就可以禁用或减慢LinearSnapHelper的抛出行为了。

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