drive Android rendering from the main thread via invalidate() calls

android/java/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxgl/views/MapView.java

@@ -26,6 +26,7 @@ import android.view.SurfaceView;
 import android.view.View;
 import android.view.ViewConfiguration;
 import android.widget.ZoomButtonsController;
+import android.util.Log;
 
 import com.almeros.android.multitouch.gesturedetectors.RotateGestureDetector;
 import com.almeros.android.multitouch.gesturedetectors.TwoFingerGestureDetector;
@@ -1168,6 +1169,18 @@ public class MapView extends SurfaceView {
     // Map events
     //
 
+    // Called when the map needs to be rerendered
+    // Called via JNI from NativeMapView
+    protected void onInvalidate() {
+        post(new Runnable() {
+            @Override
+            public void run() {
+                mNativeMapView.invalidate();
+            }
+        });
+    }
+
+
     public interface OnMapChangedListener {
         void onMapChanged();
     }

android/java/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxgl/views/NativeMapView.java

@@ -2,6 +2,7 @@ package com.mapbox.mapboxgl.views;
 
 import android.graphics.PointF;
 import android.view.Surface;
+import android.util.Log;
 
 import com.mapbox.mapboxgl.geometry.LatLng;
 import com.mapbox.mapboxgl.geometry.LatLngZoom;
@@ -85,6 +86,10 @@ class NativeMapView {
         nativeUpdate(mNativeMapViewPtr);
     }
 
+    public void invalidate() {
+        nativeOnInvalidate(mNativeMapViewPtr);
+    }
+
     public void resize(int width, int height, float ratio, int fbWidth,
             int fbHeight) {
         if (width < 0) {
@@ -342,6 +347,10 @@ class NativeMapView {
     // Callbacks
     //
 
+    protected void onInvalidate() {
+        mMapView.onInvalidate();
+    }
+
     protected void onMapChanged() {
         mMapView.onMapChanged();
     }
@@ -384,6 +393,8 @@ class NativeMapView {
 
     private native void nativeUpdate(long nativeMapViewPtr);
 
+    private native void nativeOnInvalidate(long nativeMapViewPtr);
+
     private native void nativeResize(long nativeMapViewPtr, int width,
             int height, float ratio, int fbWidth, int fbHeight);