在Vuforia-Unity项目中保持ActionBar/Navigation Bar可见的技术问询

Hey Alex, let's tackle this ActionBar visibility issue with your Unity-Vuforia AR integration. I've dealt with similar scenarios before, so here are a few targeted solutions you can try:

Unity's built-in settings often override Android theme configurations, so start here to rule out basic conflicts:

• Open Unity and go to Edit > Project Settings > Player
• Switch to the Android tab, then find the Resolution and Presentation section
• Uncheck the Fullscreen option under Fullscreen Mode (set it to Windowed instead)
• Double-check the Other Settings tab to ensure there are no flags forcing fullscreen or hiding system UI
• Rebuild your Android project from Unity and re-integrate it into your existing app

Your earlier wrapper attempt might have failed because of incorrect lifecycle handling. Here's a reliable way to create a custom activity that retains the ActionBar:

1. In your Android Studio project, create a new class extending either UnityPlayerActivity or AppCompatActivity (if using AppCompat themes):

// If using AppCompat
public class CustomARActivity extends AppCompatActivity {
    protected UnityPlayer mUnityPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        // Force ActionBar to show
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.show();
        }

        // Initialize UnityPlayer correctly
        mUnityPlayer = new UnityPlayer(this);
        setContentView(mUnityPlayer);
        mUnityPlayer.requestFocus();

        // Clear fullscreen flags from the window
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
    }

    // Override required Unity lifecycle methods
    @Override
    protected void onDestroy() {
        mUnityPlayer.quit();
        super.onDestroy();
    }

    @Override
    protected void onPause() {
        super.onPause();
        mUnityPlayer.pause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        mUnityPlayer.resume();
    }

    // Add other required methods like onConfigurationChanged if needed
}

2. Update your AndroidManifest.xml to use this custom activity instead of the default UnityPlayerActivity, and set a theme that supports ActionBar:

<activity
    android:name=".CustomARActivity"
    android:theme="@style/Theme.AppCompat.Light.DarkActionBar"
    android:configChanges="orientation|screenSize|keyboardHidden|navigation">
    <intent-filter>
        <!-- Add your intent filters here -->
    </intent-filter>
</activity>

If you prefer handling it from Unity, create a script that directly calls Android native methods to show the ActionBar and disable fullscreen:

using UnityEngine;

public class KeepActionBarActive : MonoBehaviour
{
    void Start()
    {
        // Disable Unity's fullscreen setting
        Screen.fullScreen = false;

        #if UNITY_ANDROID && !UNITY_EDITOR
        // Access the current Android Activity
        AndroidJavaClass unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
        AndroidJavaObject currentActivity = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity");

        // Clear fullscreen flag from the window
        AndroidJavaObject window = currentActivity.Call<AndroidJavaObject>("getWindow");
        window.Call("clearFlags", 0x00000400); // Constant for FLAG_FULLSCREEN

        // Show the ActionBar (adjust if using AppCompat)
        AndroidJavaObject actionBar = currentActivity.Call<AndroidJavaObject>("getSupportActionBar");
        if (actionBar != null)
        {
            actionBar.Call("show");
        }
        #endif
    }
}

Attach this script to a persistent GameObject in your Unity AR scene before building.

Sometimes Unity exports a manifest that overrides your app's theme. Locate the Unity library's AndroidManifest.xml (usually in library/src/main/) and update the activity theme explicitly:

<activity android:name="com.unity3d.player.UnityPlayerActivity"
          android:theme="@style/Theme.AppCompat.Light.DarkActionBar"
          android:configChanges="orientation|screenSize|keyboardHidden">
</activity>

Ensure your main app's theme uses the same AppCompat family to avoid styling conflicts.

Start with Solution 1 since it's the simplest, then move to the others if needed. These steps should force the ActionBar to stay visible during AR runtime.

内容的提问来源于stack exchange，提问作者AtomicDragon