Proguard and adding a GeoJson source

[cammace]

Enabling Proguard in an android app and trying to create a GeoJson source will result in an app crash with this log:

07-20 14:58:22.380 9325-9325/com.mapbox.services.android.testapp E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                   Process: com.mapbox.services.android.testapp, PID: 9325
                                                                                   java.lang.NoSuchMethodError: no non-static method "Lcom/google/gson/JsonObject;.entrySet()Ljava/util/Set;"
                                                                                       at com.mapbox.mapboxsdk.style.sources.GeoJsonSource.nativeSetFeatureCollection(Native Method)
                                                                                       at com.mapbox.mapboxsdk.style.sources.GeoJsonSource.setGeoJson(Unknown Source:0)
                                                                                       at com.mapbox.mapboxsdk.style.sources.GeoJsonSource.<init>(Unknown Source:7)
                                                                                       at com.mapbox.services.android.testapp.optimizedtrip.OptimizedTripActivity.a(Unknown Source:23)
                                                                                       at com.mapbox.services.android.testapp.optimizedtrip.OptimizedTripActivity.a(Unknown Source:0)
                                                                                       at com.mapbox.services.android.testapp.optimizedtrip.OptimizedTripActivity$1.a(Unknown Source:45)
                                                                                       at d.g$a$1$1.run(Unknown Source:41)
                                                                                       at android.os.Handler.handleCallback(Handler.java:769)
                                                                                       at android.os.Handler.dispatchMessage(Handler.java:98)
                                                                                       at android.os.Looper.loop(Looper.java:164)
                                                                                       at android.app.ActivityThread.main(ActivityThread.java:6541)
                                                                                       at java.lang.reflect.Method.invoke(Native Method)
                                                                                       at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
                                                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

Code being used:

GeoJsonSource source = new GeoJsonSource(LINE_SOURCE, featureCollection);
    mapboxMap.addSource(source);

    LineLayer layer = new LineLayer(LINE_LAYER, LINE_SOURCE).withProperties(
      PropertyFactory.lineWidth(5f),
      PropertyFactory.lineColor(Color.parseColor("#009DF9"))
    );

    mapboxMap.addLayerBelow(layer, "poi-parks-scalerank2");

cc: @tobrun @Guardiola31337

[tobrun]

Seems that we need to include proguard rules for gson, don't see this as a blocker for a 5.1.1 release (end users can include this themselves in meantime). Adding to 5.2.0 milestone.

[Guardiola31337]

I run into the same issue in mapbox/mapbox-android-demo#396 and I fixed it adding -keep class com.google.** { *; }