setSystemUiVisibility（SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION）不工作 [英] setSystemUiVisibility(SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION) does not work

问题描述

我一直在解决与setSystemUiVisibility（）来试图隐藏软导航按钮一段时间（对于视频播放器）。它似乎并不工作作为标榜。这是我的code，内可见的FrameLayout 。

I've been battling with setSystemUiVisibility() to try to hide the soft navigation buttons for a while (for a video player). It does not seem to work as advertised. Here is my code, inside a visible FrameLayout.

void setNavVisibility(boolean visible)
{
    int newVis = SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
    if (!visible)
    {
        newVis |= SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION;
    }
    setSystemUiVisibility(newVis);
}

略从SDK的例子修改：

Slightly modified from the SDK example:

    void setNavVisibility(boolean visible) {
        int newVis = SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | SYSTEM_UI_FLAG_LAYOUT_STABLE;
        if (!visible) {
            newVis |= SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_FULLSCREEN
                    | SYSTEM_UI_FLAG_HIDE_NAVIGATION;
        }

无论是调用的时候做任何事情。我取得了一些成功，当我从一个不同的查看骂他们，但文件没有提到的查看您呼吁从有什么影响？我认为该文件是（意外惊喜）在这里有点欠缺。没有人知道到底发生了什么呢？

Neither do anything when called. I had some success when I called them from a different View, but the documentation doesn't mention that the View you are calling from has any effect? I assume that the documentation is (surprise surprise) somewhat lacking here. Does anyone know what's really going on?

推荐答案

嗯，显然我duplicated ！我自己的问题但无论如何，我找到了答案：读取源$ C ​​$ C之后 - 这往往是找东西在Android的土地的唯一途径 - 我发现下面的无证事实：

Hmm apparently I duplicated my own question! But anyway I found the answer: After reading the source code - which is often the only way to find things out in Android-land - I discovered the following undocumented fact:

setSystemUiVisibility（）只具有效力，当你从调用它的观点是可见的！

更：视图中调用setSystemUiVisibility（）必须的继续的的导航栏可以看到保持隐藏。感谢您记录的家伙，真是太好了。

Even more: The view in which you call setSystemUiVisibility() must remain visible for the nav bar to remain hidden. Thanks for documenting that guys, really great.

下面是相关code，在 View.java 。

Here is the relevant code, in View.java.

void performCollectViewAttributes(AttachInfo attachInfo, int visibility) {
    if ((visibility & VISIBILITY_MASK) == VISIBLE) {
        if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) {
            attachInfo.mKeepScreenOn = true;
        }
        attachInfo.mSystemUiVisibility |= mSystemUiVisibility;
        ListenerInfo li = mListenerInfo;
        if (li != null && li.mOnSystemUiVisibilityChangeListener != null) {
            attachInfo.mHasSystemUiListeners = true;
        }
    }
}

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