Android:如何正确隐藏系统用户界面

Question

我正在开发一个视频播放器应用程序，但遇到了一个问题。我有一个包含全屏按钮的自定义视频 Controller ，我想在用户进入全屏模式时隐藏系统 UI(导航栏和状态栏)。我试过做类似 this 的事情, 但它不能正常工作。我的应用程序如下图所示:

当我点击全屏按钮时，我将方向更改为横向并隐藏了系统用户界面，但我的播放器没有全屏显示。它看起来像下面的屏幕:

此外，当我点击屏幕时，我想显示我的视频 Controller ，但系统 UI 却显示以下内容:

那么，我该如何实现这种行为呢？以下是我的全屏和隐藏/显示系统 UI 的方法:

@Override
public void toggleFullscreen() {
    LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) mVideoContainer.getLayoutParams();
    if (!mFullscreen) {
             setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
        hideSystemUI();
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        params.width = metrics.widthPixels;
        params.height = metrics.heightPixels;
        params.setMargins(0, 0, 0, 0);
    } else {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        showSystemUI();
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        params.width = metrics.widthPixels;
        params.height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 300, metrics);
            params.setMargins(0, 0, 0, 0);
    }
    mVideoContainer.setLayoutParams(params);
    mFullscreen = !mFullscreen;
}

private void hideSystemUI() {
    View decorView = getWindow().getDecorView();
    int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
    if (Build.VERSION.SDK_INT < 16) {
            getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN)
    } else {
        uiOptions |= View.SYSTEM_UI_FLAG_FULLSCREEN;
    }
    decorView.setSystemUiVisibility(uiOptions);
}

private void showSystemUI() {
    View decorView = getWindow().getDecorView();
    decorView.setSystemUiVisibility(0);
}

这是我的布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/video_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <FrameLayout
        android:id="@+id/videoSurfaceContainer"
        android:layout_width="match_parent"
        android:layout_height="300dp" >

        <SurfaceView
            android:id="@+id/videoSurface"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </FrameLayout>
</LinearLayout>

Answer 1

我将其包含在我想要隐藏导航栏和状态栏的每个 Activity 中:

    public void hideToolBr(){

        // BEGIN_INCLUDE (get_current_ui_flags)
        // The UI options currently enabled are represented by a bitfield.
        // getSystemUiVisibility() gives us that bitfield.
        int uiOptions = getWindow().getDecorView().getSystemUiVisibility();
        int newUiOptions = uiOptions;
        // END_INCLUDE (get_current_ui_flags)
        // BEGIN_INCLUDE (toggle_ui_flags)
        boolean isImmersiveModeEnabled =
                ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions);
        if (isImmersiveModeEnabled) {
            Log.i(Constants.TAG_DEF, "Turning immersive mode mode off. ");
        } else {
            Log.i(Constants.TAG_DEF, "Turning immersive mode mode on.");
        }

        // Navigation bar hiding:  Backwards compatible to ICS.
        if (Build.VERSION.SDK_INT >= 14) {
            newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
        }

        // Status bar hiding: Backwards compatible to Jellybean
        if (Build.VERSION.SDK_INT >= 16) {
            newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN;
        }

        // Immersive mode: Backward compatible to KitKat.
        // Note that this flag doesn't do anything by itself, it only augments the behavior
        // of HIDE_NAVIGATION and FLAG_FULLSCREEN.  For the purposes of this sample
        // all three flags are being toggled together.
        // Note that there are two immersive mode UI flags, one of which is referred to as "sticky".
        // Sticky immersive mode differs in that it makes the navigation and status bars
        // semi-transparent, and the UI flag does not get cleared when the user interacts with
        // the screen.
        if (Build.VERSION.SDK_INT >= 18) {
            newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        }

        getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
        //END_INCLUDE (set_ui_flags)

    }

然后在我的 Activity 的 onCreate 方法中，我在 setContentView()

之后调用它

hideToolBr();

然后用户所要做的就是从底部向上滑动或从顶部向下滑动以调出状态栏或导航栏。谷歌称之为“沉浸式模式”。它使开发人员可以充分利用设备的屏幕空间。

取自Google沉浸式模式的例子，调用这个显示系统UI:

    // This snippet shows the system bars. It does this by removing all the flags
// except for the ones that make the content appear under the system bars.
private void showSystemUI() {
    mDecorView.setSystemUiVisibility(
            View.SYSTEM_UI_FLAG_LAYOUT_STABLE
            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}

您可以找到更多信息here .

编辑:

也将其添加到您的 styles.xml 中

    <style name="YourTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="android:colorForeground">@color/colorPrimaryDark</item>
</style>