[android] - snapshot bitmap with view based content

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/NativeMapView.java

@@ -30,6 +30,7 @@
 import com.mapbox.mapboxsdk.style.light.Light;
 import com.mapbox.mapboxsdk.style.sources.CannotAddSourceException;
 import com.mapbox.mapboxsdk.style.sources.Source;
+import com.mapbox.mapboxsdk.utils.BitmapUtils;
 import com.mapbox.services.commons.geojson.Feature;
 
 import java.nio.ByteBuffer;
@@ -40,7 +41,6 @@
 
 import timber.log.Timber;
 
-
 // Class that wraps the native methods for convenience
 final class NativeMapView {
 
@@ -917,12 +917,20 @@ protected void onMapChanged(int rawChange) {
   }
 
   protected void onFpsChanged(double fps) {
+    if (isDestroyedOn("OnFpsChanged")) {
+      return;
+    }
     mapView.onFpsChanged(fps);
   }
 
-  protected void onSnapshotReady(Bitmap bitmap) {
-    if (snapshotReadyCallback != null && bitmap != null) {
-      snapshotReadyCallback.onSnapshotReady(bitmap);
+  protected void onSnapshotReady(Bitmap mapContent) {
+    if (isDestroyedOn("OnSnapshotReady")) {
+      return;
+    }
+
+    Bitmap viewContent = BitmapUtils.createBitmapFromView(mapView);
+    if (snapshotReadyCallback != null && mapContent != null && viewContent != null) {
+      snapshotReadyCallback.onSnapshotReady(BitmapUtils.mergeBitmap(mapContent, viewContent));
     }
   }
 

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/BitmapUtils.java

@@ -0,0 +1,33 @@
+package com.mapbox.mapboxsdk.utils;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.support.annotation.NonNull;
+import android.view.View;
+
+public class BitmapUtils {
+
+  public static Bitmap createBitmapFromView(@NonNull View view) {
+    view.setDrawingCacheEnabled(true);
+    view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_LOW);
+    view.buildDrawingCache();
+
+    if (view.getDrawingCache() == null) {
+      return null;
+    }
+
+    Bitmap snapshot = Bitmap.createBitmap(view.getDrawingCache());
+    view.setDrawingCacheEnabled(false);
+    view.destroyDrawingCache();
+    return snapshot;
+  }
+
+  public static Bitmap mergeBitmap(@NonNull Bitmap background, @NonNull Bitmap foreground) {
+    Bitmap result = Bitmap.createBitmap(background.getWidth(), background.getHeight(), background.getConfig());
+    Canvas canvas = new Canvas(result);
+    canvas.drawBitmap(background, 0f, 0f, null);
+    canvas.drawBitmap(foreground, 10, 10, null);
+    return result;
+  }
+
+}