RecyclerView 获取第一个曝光最大的itemposition

最新推荐文章于 2024-06-24 14:23:29 发布

xuwb123xuwb

最新推荐文章于 2024-06-24 14:23:29 发布

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分类专栏： Android

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本文介绍如何使用getLocationOnScreen与getLocalVisibleRect方法获取Android中View的屏幕坐标，以及如何根据显示高度或宽度确定当前滑动到的View索引，适用于垂直或水平滑动场景。

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获取指定view 在屏幕中坐标

    int[] location = new int[2];
 view.getLocationOnScreen(location);
    int x=location[0];//获取当前位置的横坐标
    int y=location[1];//获取当前位置的纵坐标

竖向滑动：

 public int getCurrentViewIndex(LinearLayoutManager linearLayoutManager) {
        int firstVisibleItem = linearLayoutManager.findFirstVisibleItemPosition();
        int lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
        int currentIndex = firstVisibleItem;
        int lastHeight = 0;
        for (int i = firstVisibleItem; i <= lastVisibleItem; i++) {
            View view = linearLayoutManager.getChildAt(i - firstVisibleItem);
            if (null == view) {
                continue;
            }
            int[] location = new int[2];
            view.getLocationOnScreen(location);
            LogUtil.loge(TAG, "-------------------getLocationOnScreen i :" + (i - firstVisibleItem) + "--location[0]:" + location[0] + "---location[1]:" + location[1]);
            Rect localRect = new Rect();
            view.getLocalVisibleRect(localRect);
            LogUtil.loge(TAG, "------------------getLocalVisibleRect:" + "left:" + localRect.left + "----right:" + localRect.right);
            int showHeight = localRect.bottom - localRect.top;
            if (showHeight > lastHeight) {
                currentIndex = i;
                lastHeight = showHeight;
            }
        }
        if (currentIndex < 0) {
            currentIndex = 0;
        }
        return currentIndex;

    }

横向滑动：

 public int getCurrentViewIndex(LinearLayoutManager linearLayoutManager) {
        int firstVisibleItem = linearLayoutManager.findFirstVisibleItemPosition();
        int lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
        int currentIndex = firstVisibleItem;
        int lastWidth = 0;
        for (int i = firstVisibleItem; i <= lastVisibleItem; i++) {
            View view = linearLayoutManager.getChildAt(i - firstVisibleItem);
            if (null == view) {
                continue;
            }
            int[] location = new int[2];
            view.getLocationOnScreen(location);
            LogUtil.loge(TAG, "----------location[0]:" + location[0] + "---location[1]:" + location[1]+"--position:"+(i - firstVisibleItem));
            Rect localRect = new Rect();
            view.getLocalVisibleRect(localRect);
//            LogUtil.loge(TAG, "------------------getLocalVisibleRect:" + "left:" + localRect.left + "----right:" + localRect.right + "--i:" + (i - firstVisibleItem));
            int showWidth = localRect.right - localRect.left;
            if (showWidth > lastWidth) {
                currentIndex = i;
                lastWidth = showWidth;
            }
        }
        if (currentIndex < 0) {
            currentIndex = 0;
        }
        return currentIndex;
    }