1 files changed, 5 insertions, 1 deletions
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/location/LayerSourceProvider.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/location/LayerSourceProvider.java
index d6198a7da8..cac513c2f9 100644
--- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/location/LayerSourceProvider.java
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/location/LayerSourceProvider.java
@@ -1,5 +1,6 @@
 package com.mapbox.mapboxsdk.location;
 
+import android.support.annotation.NonNull;
 import com.mapbox.geojson.Feature;
 import com.mapbox.mapboxsdk.style.layers.CircleLayer;
 import com.mapbox.mapboxsdk.style.layers.Layer;
@@ -50,6 +51,7 @@ class LayerSourceProvider {
 
   private static final String EMPTY_STRING = "";
 
+  @NonNull
   GeoJsonSource generateSource(Feature locationFeature) {
     return new GeoJsonSource(
       LOCATION_SOURCE,
@@ -58,7 +60,8 @@ class LayerSourceProvider {
     );
   }
 
-  Layer generateLayer(String layerId) {
+  @NonNull
+  Layer generateLayer(@NonNull String layerId) {
     SymbolLayer layer = new SymbolLayer(layerId, LOCATION_SOURCE);
     layer.setProperties(
       iconAllowOverlap(true),
@@ -94,6 +97,7 @@ class LayerSourceProvider {
     return layer;
   }
 
+  @NonNull
   Layer generateAccuracyLayer() {
     return new CircleLayer(ACCURACY_LAYER, LOCATION_SOURCE)
       .withProperties(