在 Android 中使用 PopupWindow 调暗背景

Question

我可以使用 PopupWindow 而不是 Dialog 使背景变暗吗？我问这个是因为我正在使用对话框，但是对话框没有显示在单击的项目下方，而使用 PopupWindow 我已经在项目下方显示了弹出窗口。

Answer 1

我使用以下代码，它对我来说效果很好。

public static void dimBehind(PopupWindow popupWindow) {
    View container;
    if (popupWindow.getBackground() == null) {
        if (VERSION.SDK_INT >= VERSION_CODES.M){
            container = (View) popupWindow.getContentView().getParent();
        } else {
            container = popupWindow.getContentView();
        }
    } else {
        if (VERSION.SDK_INT >= VERSION_CODES.M) {
            container = (View) popupWindow.getContentView().getParent().getParent();
        } else {
            container = (View) popupWindow.getContentView().getParent();
        }
    }
    Context context = popupWindow.getContentView().getContext();
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    WindowManager.LayoutParams p = (WindowManager.LayoutParams) container.getLayoutParams();
    p.flags = WindowManager.LayoutParams.FLAG_DIM_BEHIND;
    p.dimAmount = 0.3f;
    wm.updateViewLayout(container, p);
}

来自 this answer.

更新：

下面fdermishin的回答比较好。我已经将它向后测试到 API 级别 19，并且效果很好。

如果你正在使用 Kotlin，最好将其用作 Kotlin 扩展：

//Just new a kotlin file(e.g. ComponmentExts),
//copy the following function declaration into it
/**
 * Dim the background when PopupWindow shows
 */
fun PopupWindow.dimBehind() {
    val container = contentView.rootView
    val context = contentView.context
    val wm = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
    val p = container.layoutParams as WindowManager.LayoutParams
    p.flags = p.flags or WindowManager.LayoutParams.FLAG_DIM_BEHIND
    p.dimAmount = 0.3f
    wm.updateViewLayout(container, p)
}

//then use it in other place like this：
popupWindow.dimBehind()

Answer 2

JiaJiaGu 的解决方案有效，但弹出窗口将与导航栏重叠，因为它清除了所有其他标志。

所以我在这里稍微改变一下：

public static void dimBehind(PopupWindow popupWindow) {
    View container;
    if (VERSION.SDK_INT >= VERSION_CODES.M){
        container = (View) popupWindow.getContentView().getParent();
    } else {
        container = popupWindow.getContentView();
    } 
    if (popupWindow.getBackground() != null) {
        container = container.getParent()
    }
    Context context = popupWindow.getContentView().getContext();
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    WindowManager.LayoutParams p = (WindowManager.LayoutParams) container.getLayoutParams();
    p.flags |= WindowManager.LayoutParams.FLAG_DIM_BEHIND; // add a flag here instead of clear others
    p.dimAmount = 0.3f;
    wm.updateViewLayout(container, p);
}

我post一个新的回答，因为我不能评论JiaJiaGu的回答

Answer 3

看来我想出了摆脱 API 版本检查的方法。使用 container = popupWindow.getContentView().getRootView() 解决了这个问题，但是我还没有针对旧的 API 测试过它。改编曹俊越的解决方案：

public static void dimBehind(PopupWindow popupWindow) {
    View container = popupWindow.getContentView().getRootView();
    Context context = popupWindow.getContentView().getContext();
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    WindowManager.LayoutParams p = (WindowManager.LayoutParams) container.getLayoutParams();
    p.flags |= WindowManager.LayoutParams.FLAG_DIM_BEHIND;
    p.dimAmount = 0.3f;
    wm.updateViewLayout(container, p);
}

在 Android 中使用 PopupWindow 调暗背景

Dim the background using PopupWindow in Android

android

dialog

popupwindow

android-dialog

android-popupwindow