RecyclerView列表項滑動邊緣彈性效果

您可以通過使用ItemTouchHelper類來實現RecyclerView列表項滑動邊緣彈性效果。下面是一個簡單的示例代碼：

public class MyItemTouchHelper extends ItemTouchHelper.Callback {

    private static final float ALPHA_FULL = 1.0f;

    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
        int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
        return makeMovementFlags(dragFlags, swipeFlags);
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
        // 拖動時的處理
        return true;
    }

    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        // 滑動時的處理
    }

    @Override
    public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
        // 實現邊緣彈性效果
        if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
            // 獲取RecyclerView中的子View
            View itemView = viewHolder.itemView;
            // 獲取RecyclerView中子View寬度
            int itemWidth = itemView.getWidth();
            float alpha = ALPHA_FULL - Math.abs(dX) / (float) itemWidth;
            // 設置子View的透明度
            itemView.setAlpha(alpha);
            // 設置子View的縮放比例
            itemView.setScaleX(alpha);
            itemView.setScaleY(alpha);
        }

        super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
    }

    @Override
    public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
        if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
            // 當用戶拖動或滑動一個item時執行
        }

        super.onSelectedChanged(viewHolder, actionState);
    }

    @Override
    public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        // 當用戶拖動或滑動完成后執行
        viewHolder.itemView.setAlpha(ALPHA_FULL);
        viewHolder.itemView.setScaleX(ALPHA_FULL);
        viewHolder.itemView.setScaleY(ALPHA_FULL);

        super.clearView(recyclerView, viewHolder);
    }
}

然后在你的Activity或Fragment中創建ItemTouchHelper，并將其附加到RecyclerView上：

ItemTouchHelper.Callback callback = new MyItemTouchHelper();
ItemTouchHelper touchHelper = new ItemTouchHelper(callback);
touchHelper.attachToRecyclerView(recyclerView);

這樣，您就可以實現RecyclerView列表項滑動邊緣彈性效果了。希望對您有幫助！