Issues Creating Integrated Google Maps Plugin

Unity Engine
,
1

I am trying to create a google maps view that will display as a subview (or fragment) of my Unity app. What I’ve read so far implies this is possible but I’ve run into many issues.

My problem right now is that if I use

import android.support.v7.app.AppCompatActivity

In my plugin, Unity is no longer able to find the class

I/Unity   (29774): AndroidJavaException: java.lang.ClassNotFoundException: com.myapp.mapspluginlib.UnityMapsPluginActivity
I/Unity   (29774): java.lang.ClassNotFoundException: com.myapp.mapspluginlib.UnityMapsPluginActivity
I/Unity   (29774): at java.lang.Class.classForName(Native Method)
I/Unity   (29774): at java.lang.Class.forName(Class.java:309)
I/Unity   (29774): at java.lang.Class.forName(Class.java:273)
I/Unity   (29774): at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
I/Unity   (29774): at com.unity3d.player.UnityPlayer.a(Unknown Source)
I/Unity   (29774): at com.unity3d.player.UnityPlayer$b.run(Unknown Source)
I/Unity   (29774): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.myapp.mapspluginlib.UnityMapsPluginActivity" on path: DexPathList[[zip file "/data/app/com.myapp.MyProject-2/base.apk"],nativeLibraryDirectories=[/data/app/com.myapp.MyProject-2/lib/arm, /vendor/lib, /system/lib]]

I/Unity   (29774): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

I/Unity   (29774): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)

I/Unity   (29774): at java.lang.ClassLoader.loadClass(ClassLoader.java:469)

I/Unity   (29774): ... 6 more

I/Unity   (29774): Suppressed: java.lang.NoClassDefFoundEr

The class was able to be found when I was using

public class UnityMapsPluginActivity extends Fragment implements OnMapReadyCallback {

instead of

public class UnityMapsPluginActivity extends AppCompatActivity implements OnMapReadyCallback {

But based on their sample code, and the errors I ran into, I believe Google Maps requires I use the AppCompatActivity class.

Here is the function I am trying to call

public class UnityMapsPluginActivity extends AppCompatActivity implements OnMapReadyCallback {

    private static Activity activity;

    static public void _OpenMapActivity(Activity activity) {
        UnityMapsPluginActivity.activity = activity;
        Intent myIntent = new Intent(activity, UnityMapsPluginActivity.class);
        activity.startActivity(myIntent);
    }
...

and here’s how I am calling it

public static void _testPresentSubview() {
        AndroidJavaClass androidJC = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
        AndroidJavaObject currentActivity = androidJC.GetStatic<AndroidJavaObject>("currentActivity");
        // Accessing the class to call a static method on it
        AndroidJavaClass jc = new AndroidJavaClass("com.myapp.mapspluginlib.UnityMapsPluginActivity");
        // Calling a Call method to which the current activity is passed

        jc.CallStatic("_OpenMapActivity", currentActivity);
    }

From what I can tell this error is coming from the fact that Unity and support v7 are using different namespaces (or DEXs) so they can’t locate each other. Does anyone know of a way to call a support v7 class from Unity? Or any workaround that would allow me to call a static function from Unity on a class that extends AppCompatActivity?

2

Bump

3

Hi, did you find a solution for your problem?
I currently want to do the same thing as you, displaying a GMap view in my Unity app but I ran into the same problem as you. Except for me the java.lang.ClassNotFoundException directly happens when I use this

public class MapsPlugin extends Fragment implements OnMapReadyCallback

So even if you didn’t find an answer with the AppCompatActivity class, can you tell me if you did something special (Unity side or Android Studio side) to make Unity find your class in the first time with the Fragment class?
Thanks !