Android Snackbar getAnchorView（）与父视图

我已经读过Snackbar了

但不确定snackbar的

parentTarget

（父视图）和

anchoredView

之间的区别

如果我错了，请纠正我：

1）

父视图

是一个视图，snackbar从该视图向上走到Hirrchy视图，以查找合适的父视图

2） 合适的父视图不是anchoredView

当设置一个

parentView

（ctor需要）和

anchoredView

时会发生什么

小吃店在哪里开门

SnackBar

的父视图将告诉您将在哪个容器或布局上运行 应绘制蛇形条。通常，snackbar会寻找协调人 作为参数传递的视图的父视图布局，如果 找不到，需要活动内容布局 （android.R.id.content）作为父级的Framelayout

代码取自SnackBar

@Nullable
    private static ViewGroup findSuitableParent(View view) {
        ViewGroup fallback = null;
        do {
            if (view instanceof CoordinatorLayout) {
                // We've found a CoordinatorLayout, use it
                return (ViewGroup) view;
            } else if (view instanceof FrameLayout) {
                if (view.getId() == android.R.id.content) {
                    // If we've hit the decor content view, then we didn't find a CoL in the
                    // hierarchy, so use it.
                    return (ViewGroup) view;
                } else {
                    // It's not the content view but we'll use it as our fallback
                    fallback = (ViewGroup) view;
                }
            }
            if (view != null) {
                // Else, we will loop and crawl up the view hierarchy and try to find a parent
                final ViewParent parent = view.getParent();
                view = parent instanceof View ? (View) parent : null;
            }
        } while (view != null);
        // If we reach here then we didn't find a CoL or a suitable content view so we'll fallback
        return fallback;
    }

BaseTransientBottomBar

的锚点将显示哪个视图的顶部 将显示snackbar

代码取自BaseTransientBottomBar

private int calculateBottomMarginForAnchorView() {
    if (anchorView == null) {
      return 0;
    }

    int[] anchorViewLocation = new int[2];
    anchorView.getLocationOnScreen(anchorViewLocation);
    int anchorViewAbsoluteYTop = anchorViewLocation[1];

    int[] targetParentLocation = new int[2];
    targetParent.getLocationOnScreen(targetParentLocation);
    int targetParentAbsoluteYBottom = targetParentLocation[1] + targetParent.getHeight();

    return targetParentAbsoluteYBottom - anchorViewAbsoluteYTop;
  }

您可以在这里的SnackBar中找到源代码 这里是BaseTransientBottomBar

SnackBar

的父视图将告诉您将在哪个容器或布局上运行 应绘制蛇形条。通常，snackbar会寻找协调人 作为参数传递的视图的父视图布局，如果 找不到，需要活动内容布局 （android.R.id.content）作为父级的Framelayout

代码取自SnackBar

@Nullable
    private static ViewGroup findSuitableParent(View view) {
        ViewGroup fallback = null;
        do {
            if (view instanceof CoordinatorLayout) {
                // We've found a CoordinatorLayout, use it
                return (ViewGroup) view;
            } else if (view instanceof FrameLayout) {
                if (view.getId() == android.R.id.content) {
                    // If we've hit the decor content view, then we didn't find a CoL in the
                    // hierarchy, so use it.
                    return (ViewGroup) view;
                } else {
                    // It's not the content view but we'll use it as our fallback
                    fallback = (ViewGroup) view;
                }
            }
            if (view != null) {
                // Else, we will loop and crawl up the view hierarchy and try to find a parent
                final ViewParent parent = view.getParent();
                view = parent instanceof View ? (View) parent : null;
            }
        } while (view != null);
        // If we reach here then we didn't find a CoL or a suitable content view so we'll fallback
        return fallback;
    }

BaseTransientBottomBar

的锚点将显示哪个视图的顶部 将显示snackbar

代码取自BaseTransientBottomBar

private int calculateBottomMarginForAnchorView() {
    if (anchorView == null) {
      return 0;
    }

    int[] anchorViewLocation = new int[2];
    anchorView.getLocationOnScreen(anchorViewLocation);
    int anchorViewAbsoluteYTop = anchorViewLocation[1];

    int[] targetParentLocation = new int[2];
    targetParent.getLocationOnScreen(targetParentLocation);
    int targetParentAbsoluteYBottom = targetParentLocation[1] + targetParent.getHeight();

    return targetParentAbsoluteYBottom - anchorViewAbsoluteYTop;
  }

您可以在这里的SnackBar中找到源代码

---

和这里的BaseTransientBottomBar

您自己试过吗？您自己试过吗？谢谢，您能用一个例子解释一下两者之间的区别吗

在哪个视图的顶部将显示snackbar

与在哪个容器或布局上应绘制snackbar相比。谢谢，请举例说明两者之间的区别

在哪个视图的顶部将显示snackbar

与应在哪个容器或布局上绘制snackbar相比。