永久隐藏活动中的导航栏

Question

是否可以永久删除活动上的导航栏？我想删除与按钮出现在平板电脑屏幕上的按钮，而不是操作栏。这里。

我知道不建议那样做，我没有做这个决定，但我需要这样做。在我的布局上，还有一个按钮离开活动。我的应用程序的其余部分可以有导航栏。

我找到了这段代码，并对其进行了一些修改。问题是，即使我隐藏了导航栏，也会留下一个黑色的空间。我猜系统计算屏幕大小时考虑了导航栏？

public static class Content extends ImageView implements View.OnSystemUiVisibilityChangeListener, View.OnClickListener, ActionBar.OnMenuVisibilityListener {
    Activity mActivity;
    TextView mTitleView;
    Button mPlayButton;
    SeekBar mSeekView;
    boolean mAddedMenuListener;
    boolean mMenusOpen;
    boolean mPaused;
    boolean mNavVisible;
    int mLastSystemUiVis;

    Runnable mNavHider = new Runnable() {
        @Override public void run() {
            setNavVisibility(false);
        }
    };

    public Content(Context context, AttributeSet attrs) {
        super(context, attrs);
        setOnSystemUiVisibilityChangeListener(this);
        setOnClickListener(this);
    }

    public void init(Activity activity, TextView title, Button playButton,
            SeekBar seek) {
        // This called by the containing activity to supply the surrounding
        // state of the video player that it will interact with.
        mActivity = activity;
        mTitleView = title;
        mPlayButton = playButton;
        mSeekView = seek;
        mPlayButton.setOnClickListener(this);
        setPlayPaused(true);
    }

    @Override protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (mActivity != null) {
            mAddedMenuListener = true;
            mActivity.getActionBar().addOnMenuVisibilityListener(this);
        }
    }

    @Override protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (mAddedMenuListener) {
            mActivity.getActionBar().removeOnMenuVisibilityListener(this);
        }
    }

    @Override public void onSystemUiVisibilityChange(int visibility) {
        // Detect when we go out of nav-hidden mode, to clear our state
        // back to having the full UI chrome up.  Only do this when
        // the state is changing and nav is no longer hidden.
        int diff = mLastSystemUiVis ^ visibility;
        mLastSystemUiVis = visibility;
        if ((diff&SYSTEM_UI_FLAG_HIDE_NAVIGATION) != 0
                && (visibility&SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0) {
            setNavVisibility(true);
        }
    }

    @Override protected void onWindowVisibilityChanged(int visibility) {
        super.onWindowVisibilityChanged(visibility);

        // When we become visible or invisible, play is paused.
        setPlayPaused(true);
    }

    @Override public void onClick(View v) {
        if (v == mPlayButton) {
            // Clicking on the play/pause button toggles its state.
            setPlayPaused(!mPaused);
        } else {
            // Clicking elsewhere makes the navigation visible.
            setNavVisibility(true);
        }
    }

    @Override public void onMenuVisibilityChanged(boolean isVisible) {
        mMenusOpen = isVisible;
        setNavVisibility(true);
    }

    void setPlayPaused(boolean paused) {
        mPaused = paused;
        mPlayButton.setText(paused ? R.string.play : R.string.pause);
        setKeepScreenOn(!paused);
        setNavVisibility(true);
    }

    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;
        }

        // If we are now visible, schedule a timer for us to go invisible.
        if (visible) {
            Handler h = getHandler();
            if (h != null) {
                h.removeCallbacks(mNavHider);
                if (!mMenusOpen && !mPaused) {
                    // If the menus are open or play is paused, we will not auto-hide.
                    h.postDelayed(mNavHider, 1500);
                }
            }
        }

        // Set the new desired visibility.
        setSystemUiVisibility(newVis);
        mTitleView.setVisibility(visible ? VISIBLE : INVISIBLE);
        mPlayButton.setVisibility(visible ? VISIBLE : INVISIBLE);
        mSeekView.setVisibility(visible ? VISIBLE : INVISIBLE);
    }

}

Answer 1

您可以隐藏导航栏，只需在onCreate（）上调用此方法即可，

 public void FullScreencall() {
    if(Build.VERSION.SDK_INT < 19){ 
        View v = this.getWindow().getDecorView();
        v.setSystemUiVisibility(View.GONE);
    } else {
            //for higher api versions.    
        View decorView = getWindow().getDecorView(); 
        int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        decorView.setSystemUiVisibility(uiOptions);
    }
}

这将隐藏整个面板。希望对你有帮助

Answer 2

你可以

有两种方式（都需要设备根目录）：

1-首先，在adb窗口命令中打开设备，然后运行以下操作：

 adb shell >
 pm disable-user --user 0 com.android.systemui >

要把它拿回来，只需做同样的事情，但是将disable更改为使能。

2-第二种方式，在设备构建的末尾添加以下行。道具文件：

qemu.hw.mainkeys = 1

然后要把它拿回来，就把它取下来。

如果您不知道如何编辑构建。道具文件：

• 在您的设备上下载EsExplorer并搜索build.prop然后更改其读写权限，最后添加该行。
• 下载一个专门的build.prop编辑器应用程序，如build.prop编辑器。
• 或参考该链接。

Answer 3

有一种从KitKat（4.4.2）开始的解决方案，称为沉浸式模式：https://developer.android.com/training/system-ui/immersive.html

基本上，您应该将以下代码添加到onResume（）方法中：

View decorView = getWindow().getDecorView();
decorView.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);