当我在Android中按操作栏菜单时如何隐藏导航栏 [英] How to hide navigation bar when i press action bar menu in Android

问题描述

我隐藏了导航栏(请参阅下文)，但是当我按下操作栏上的菜单按钮时，导航栏会立即出现. 我可以藏导航吗?永久禁止吗?

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

    getWindow().getDecorView().setSystemUiVisibility(
                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
                    View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
                    View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
                    View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);

    setContentView(R.layout.activity_fomenu);
}

解决方案

看看响应UI可见性，以获取有关如何收听的讨论UI可见性发生变化，因此您的应用可以做出相应的响应.

这意味着当用户选择选项菜单时，您将必须重置标志. 此处也提供了示例代码.. >

I hide the navigation bar (see below) but when I press the menu button on action bar the navigation bar immediately appear. Can I hide nav. bar permanently?

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

    getWindow().getDecorView().setSystemUiVisibility(
                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
                    View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
                    View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
                    View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);

    setContentView(R.layout.activity_fomenu);
}

解决方案

Take a look at the documentation. It says to hide the navigation use

View decorView = getWindow().getDecorView();
// Hide both the navigation bar and the status bar.
// SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as
// a general rule, you should design your app to hide the status bar whenever you
// hide the navigation bar.
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
              | View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(uiOptions);

You're already doing that. But then it says

With this approach, touching anywhere on the screen causes the navigation bar (and status bar) to reappear and remain visible. The user interaction causes the flags to be be cleared. Once the flags have been cleared, your app needs to reset them if you want to hide the bars again. See Responding to UI Visibility Changes for a discussion of how to listen for UI visibility changes so that your app can respond accordingly.

This means that you will have to reset the flags when the user selects the options menu. A sample code is also given here.

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