隐藏后在 Android KitKat 上显示导航栏

Question

在我的应用中，我想让用户隐藏或显示导航栏（返回、主页、菜单）。系统栏（电池、wifi、通知）应始终隐藏。

我用这段代码隐藏了系统栏：

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
            requestWindowFeature(Window.FEATURE_NO_TITLE);     

我成功地用这些标志隐藏了导航栏：

final static int flagsHide = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;

但我还没有找到如何再次显示导航栏。我可以用标志来做到这一点还是我需要别的东西？系统栏必须保持不可见。

Answer 1

使用此标志再次显示它

    SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN  |
 SYSTEM_UI_FLAG_LAYOUT_STABLE

Answer 2

我的一个解决方案。

private void hideNavigationBar() {
    // set navigation bar status, remember to disable "setNavigationBarTintEnabled"
    final int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
    // This work only for android 4.4+
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        getWindow().getDecorView().setSystemUiVisibility(flags);

        // Code below is to handle presses of Volume up or Volume down.
        // Without this, after pressing volume buttons, the navigation bar will
        // show up and won't hide
        final View decorView = getWindow().getDecorView();
        decorView.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
            @Override
            public void onSystemUiVisibilityChange(int visibility) {
                if((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
                    decorView.setSystemUiVisibility(flags);
                }
            }
        });
    }
}

private void showNavigationBar() {
    // set navigation bar status, remember to disable "setNavigationBarTintEnabled"
    final int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
    // This work only for android 4.4+
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        getWindow().getDecorView().setSystemUiVisibility(flags);

        // Code below is to handle presses of Volume up or Volume down.
        // Without this, after pressing volume buttons, the navigation bar will
        // show up and won't hide
        final View decorView = getWindow().getDecorView();
        decorView.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
            @Override
            public void onSystemUiVisibilityChange(int visibility) {
                if((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
                    decorView.setSystemUiVisibility(flags);
                }
            }
        });
    }
}

区别是removing "View.SYSTEM_UI_FLAG_HIDE_NAVIGATION"。

Answer 3

这将有助于显示导航栏：-

private void showSystemUI() {

mDecorView.setSystemUiVisibility(
 View.SYSTEM_UI_FLAG_LAYOUT_STABLE
 | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
 | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);

}

mDecorView 是你的父布局。 有关更多详细信息，请参阅此链接 https://developer.android.com/training/system-ui/immersive.html

Answer 4

全屏模式

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

---

恢复

activity.getWindow()
        .getDecorView()
        .setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);

Answer 5

我所有的项目都使用了最好的解决方案

public final class SystemUIUtil {

public static void hideDefaultControls(@NonNull final Activity activity) {
    final Window window = activity.getWindow();

    if (window == null) {
        return;
    }

    window.clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
    window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

    final View decorView = window.getDecorView();

    if (decorView != null) {
        int uiOptions = decorView.getSystemUiVisibility();

        if (Build.VERSION.SDK_INT >= 14) {
            uiOptions |= View.SYSTEM_UI_FLAG_LOW_PROFILE;
        }

        if (Build.VERSION.SDK_INT >= 16) {
            uiOptions |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
        }

        if (Build.VERSION.SDK_INT >= 19) {
            uiOptions |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        }

        decorView.setSystemUiVisibility(uiOptions);
    }
}

public static void showDefaultControls(@NonNull final Activity activity) {
    final Window window = activity.getWindow();

    if (window == null) {
        return;
    }

    window.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
    window.addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);

    final View decorView = window.getDecorView();

    if (decorView != null) {
        int uiOptions = decorView.getSystemUiVisibility();

        if (Build.VERSION.SDK_INT >= 14) {
            uiOptions &= ~View.SYSTEM_UI_FLAG_LOW_PROFILE;
        }

        if (Build.VERSION.SDK_INT >= 16) {
            uiOptions &= ~View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
        }

        if (Build.VERSION.SDK_INT >= 19) {
            uiOptions &= ~View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        }

        decorView.setSystemUiVisibility(uiOptions);
    }
}

}