Fullscreen Galaxy Nexus; how to disable the system navigation softkeys

Hi, has anyone tried to get their Unity app to go fullscreen on the Galaxy Nexus (running Android Ice Cream Sandwich)? The navigation bar takes up screen space and reduces the resolution to 1196 by 720. I wrote a C# script that uses the code below to access the Android "View" object, but the line viewInstance.Call("setSystemUiVisibility", 2); causes the app to crash as soon as it starts up.

Code (csharp):

1.  
2.         if (Application.platform == RuntimePlatform.Android)
3.         {
4.             using (AndroidJavaClass unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
5.             {
6.                 using (AndroidJavaObject activityInstance = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity"))
7.                 {
8.                     using (AndroidJavaObject windowInstance = activityInstance.Call<AndroidJavaObject>("getWindow"))
9.                     {
10.                         using (AndroidJavaObject viewInstance = windowInstance.Call<AndroidJavaObject>("getDecorView"))
11.                         {
12.                             viewInstance.Call("setSystemUiVisibility", 2);
13.                         }
14.                     }
15.  
16.                 }
17.             }
18.         }
19.  

The value of 2 in that line of code corresponds to this constant: http://developer.android.com/reference/android/view/View.html#SYSTEM_UI_FLAG_HIDE_NAVIGATION

 

It's a threading issue. You can access/change UI elements only from the thread which created it, and that's the main thread. Unity3D player itself runs in a seperate thread.

You must call "setSystemUiVisibility" inside of a runOnUiThread method.

Java Code:

Code (csharp):

1.  
2.         final Activity currentActivity = (Activity)UnityPlayer.currentActivity;
3.         currentActivity.runOnUiThread(new Runnable() {
4.            
5.             @Override
6.             public void run() {
7.                 setSystemUiVisibility(2);
8.             }
9.         });
10.  

Then the code will be executed in the proper thread.

 

So I tried implementing that in C# with the following, but I guess this isn't enough to do it:

Code (csharp):

1.  
2. using UnityEngine;
3.  
4. public class DisableSystemUI
5. {
6.     static AndroidJavaObject activityInstance;
7.     static AndroidJavaObject windowInstance;
8.     static AndroidJavaObject viewInstance;
9.  
10.     public delegate void RunPtr();
11.  
12.     public static void Run()
13.     {
14.         if (viewInstance != null) {
15.             viewInstance.Call("setSystemUiVisibility", 2);
16.         }
17.     }
18.  
19.     static DisableSystemUI()
20.     {
21.         if (Application.platform != RuntimePlatform.Android)
22.             return;
23.         DisableNavUI();
24.     }
25.  
26.     static void DisableNavUI()
27.     {
28.         if (Application.platform != RuntimePlatform.Android)
29.             return;
30.        
31.         using (AndroidJavaClass unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
32.         {
33.             activityInstance = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity");
34.             windowInstance = activityInstance.Call<AndroidJavaObject>("getWindow");
35.             viewInstance = windowInstance.Call<AndroidJavaObject>("getDecorView");
36.  
37.             AndroidJavaRunnable RunThis;
38.             RunThis = new AndroidJavaRunnable(new RunPtr(Run));
39.             activityInstance.Call("runOnUiThread", AndroidJNIHelper.CreateJavaRunnable(RunThis));
40.         }
41.     }
42. }
43.  

 

Did you get this to work somehow? I tried the code posted above with Erique's addition but the soft keys don't disappear. The delegate is called correctly though.

 

You should be able to hide the soft keys with setting the fullscreen flag in Screen.SetResolution
http://docs.unity3d.com/Documentation/ScriptReference/Screen.SetResolution.html

 

Yes, but I don't want to hide them, i want to be able to use that screen space. So instead of setting the LOW_PROFILE flag i would like to be able to set the SYSTEM_UI_FLAG_HIDE_NAVIGATION or SYSTEM_UI_FLAG_IMMERSIVE.

 

So this is my final variant which works and initializes the immersive sticky mode. I call DisableSystemUI.DisableNavUI() in OnApplicationFocus. But the problem is when you change volume or use a virtual keyboard the immersive mode switches off and you need to call the function DisableNavUI again. But how to know from unity when to reinitialize the immersive mode?

Code (csharp):

1.  
2. using UnityEngine;
3.  
4. public class DisableSystemUI
5. {
6. #if UNITY_ANDROID
7.     static AndroidJavaObject activityInstance;
8.     static AndroidJavaObject windowInstance;
9.     static AndroidJavaObject viewInstance;
10.  
11.     const int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 2;
12.     const int SYSTEM_UI_FLAG_LAYOUT_STABLE = 256;
13.     const int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 512;
14.     const int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 1024;
15.     const int SYSTEM_UI_FLAG_IMMERSIVE = 2048;
16.     const int SYSTEM_UI_FLAG_IMMERSIVE_STICKY = 4096;
17.     const int SYSTEM_UI_FLAG_FULLSCREEN = 4;
18.  
19.     public delegate void RunPtr();
20.  
21.     public static void Run()
22.     {
23.         if (viewInstance != null) {
24.             viewInstance.Call("setSystemUiVisibility",
25.                               SYSTEM_UI_FLAG_LAYOUT_STABLE
26.                               | SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
27.                               | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
28.                               | SYSTEM_UI_FLAG_HIDE_NAVIGATION
29.                               | SYSTEM_UI_FLAG_FULLSCREEN
30.                               | SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
31.         }
32.  
33.     }
34. #endif  
35.     public static void DisableNavUI()
36.     {
37.         if (Application.platform != RuntimePlatform.Android)
38.             return;
39. #if UNITY_ANDROID
40.         using (AndroidJavaClass unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
41.         {
42.             activityInstance = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity");
43.             windowInstance = activityInstance.Call<AndroidJavaObject>("getWindow");
44.             viewInstance = windowInstance.Call<AndroidJavaObject>("getDecorView");
45.  
46.             AndroidJavaRunnable RunThis;
47.             RunThis = new AndroidJavaRunnable(new RunPtr(Run));
48.             activityInstance.Call("runOnUiThread", RunThis);
49.         }
50. #endif
51.     }
52.  
53. }
54.  

 

Thanks for sharing Vitaly, does work, but having same issues as you. Unity needs to add this as native option so it works right. As a hack, I wonder if you could just call this once a second or something to fix itself.

 

Any news on this?

 

I was also curious about this, and whether anyone else found a more fool-proof way to get rid of the bars. We're having some issues with some integrated plugins that have native pop-ups causing the bar to appear, and then get stuck. Our QA guy noticed if he opened up one of OUR input dialogs though, the bar would go away. Lo and behold, I found a very similar call to what Vitaly has above in our code when our dialog goes away. So I'm thinking of just brute forcing that in the game's update loop or something. We can't seem to make it work 100% with event handlers unfortunately.