android: why scene goes black when showing new activity?

Questions & Answers
1

Hi,
I am developing a plugin that allows showing a new activity on top of the existing unity activity. The new activity is a standard android activity (does not derive from unity activity, etc). The new activity is also not full screen, i.e. it is supposed to have a transparent background (showing the underlying unity scene) with a portion of the display showing some popup UI.
When I run the activity code in a native android app, all is fine, I can see the underlying activity. But when I run it inside a unity app (wrapped by a plugin), the new activity popup UI shows up with black background - the underlying unity scene/activity does not show.

here is the activity definition in the manifest, as you can see it has the usual Translucent values, etc:

<activity android:configChanges="orientation|keyboardHidden" android:name="com.mycomp.MyActivity" android:theme="@android:style/Theme.Translucent.NoTitleBar"/>

any ideas why I don’t see the background?

2

You could try to have [Application.runInBackground][1] = true; set in an Awake or Start method somewhere. It defaults to false and as such pauses the Unity application when it looses focus.

3

Write your custom UnityProxyActivity,UnityPlayerActivity,and UnityPlayerNativeActivity 125https://developer.vuforia.com/resources/dev-guide/extending-unity-activities125, then override onPause and onResume like this:

      if (myKeepRunning) {
		try {
			Class superSuperClass = this.getClass().getSuperclass()
					.getSuperclass().getSuperclass();
			Field field = null;

			field = superSuperClass.getDeclaredField("mCalled");
			// set accessible true
			field.setAccessible(true);
			field.set(this, true);

			Log.v("MyUnityPlayerNativeActivity", "Value of privateKey: "
					+ field.get(this));
		} catch (Exception e) {
			super.onPause();
		}
	} else {
		super.onPause();
	}
4

Try change the MainActivity.
There are three Native java class in Unity3d.
I changed my MainActivity. Then I solved it.