求助：如何隐藏ActionBar并实现VideoView全屏？横竖屏切换适配问题

Hey there! Let's work through those two annoying issues you're having with your VideoView: hiding the ActionBar and making the video fill the screen completely, even when rotating the device.

1. First: Fix ActionBar Hiding & Initial Fullscreen Setup #

Looking at your code snippet, there's a conflicting line that's probably keeping the ActionBar visible: you're requesting Window.FEATURE_NO_TITLE but then asking for Window.FEATURE_ACTION_BAR right after. That's why the ActionBar won't hide!

Here's the corrected onCreate method, plus the flags needed for true fullscreen:

public class RowClick extends AppCompatActivity {
    VideoView videoView;
    MediaController mediaController;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        // Request no title bar first
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        // Enable fullscreen mode
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        
        setContentView(R.layout.your_activity_layout); // Replace with your actual layout file

        videoView = findViewById(R.id.videoView);
        mediaController = new MediaController(this);
        mediaController.setAnchorView(videoView);
        
        // Rest of your video initialization code (set video URI, etc.)
    }
}

Don't Forget Your Layout! #

Make sure your VideoView is set to fill the entire screen in your XML layout:

<VideoView
    android:id="@+id/videoView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center" />

2. Fixing Fullscreen on Rotation #

When you rotate the device, the system might reset your window settings or even recreate the Activity. Here's how to stop that and keep the video fullscreen:

Step 1: Update AndroidManifest.xml #

Add configChanges to your Activity declaration so the system doesn't recreate it on rotation, and set a fullscreen theme (optional but cleaner):

<activity
    android:name=".RowClick"
    android:configChanges="orientation|screenSize|smallestScreenSize"
    android:theme="@style/FullScreenVideoTheme"
    android:screenOrientation="sensor" />

Step 2: Create a Fullscreen Theme (Optional but Recommended) #

Add this to your res/values/styles.xml to handle fullscreen via theme instead of code:

<style name="FullScreenVideoTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowFullscreen">true</item>
</style>

Step 3: Handle Rotation in Code #

Override onConfigurationChanged to reapply fullscreen settings and adjust the VideoView layout when the screen rotates:

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    
    // Re-enable fullscreen
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    
    // Double-check ActionBar is hidden (just in case)
    if (getSupportActionBar() != null) {
        getSupportActionBar().hide();
    }
    
    // Force VideoView to fill the new screen size
    ViewGroup.LayoutParams params = videoView.getLayoutParams();
    params.width = ViewGroup.LayoutParams.MATCH_PARENT;
    params.height = ViewGroup.LayoutParams.MATCH_PARENT;
    videoView.setLayoutParams(params);
    
    // Reset MediaController anchor to the VideoView
    if (mediaController != null) {
        mediaController.setAnchorView(videoView);
    }
}

Quick Notes #

• If you're using a newer Android version (API 30+), you might need to handle edge-to-edge display, but the above steps should work for most cases.
• Test on a physical device if possible—emulators sometimes have weird fullscreen behavior.

内容的提问来源于stack exchange，提问作者basaya