[android] - avoid leaking dialog when context is being stopped

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

@@ -45,6 +45,7 @@ public class AttributionDialogManager implements View.OnClickListener, DialogInt
   @NonNull
   private final MapboxMap mapboxMap;
   private Set<Attribution> attributionSet;
+  private AlertDialog dialog;
 
   public AttributionDialogManager(@NonNull Context context, @NonNull MapboxMap mapboxMap) {
     this.context = context;
@@ -72,7 +73,7 @@ public class AttributionDialogManager implements View.OnClickListener, DialogInt
     AlertDialog.Builder builder = new AlertDialog.Builder(context);
     builder.setTitle(R.string.mapbox_attributionsDialogTitle);
     builder.setAdapter(new ArrayAdapter<>(context, R.layout.mapbox_attribution_list_item, attributionTitles), this);
-    builder.show();
+    dialog = builder.show();
   }
 
   private String[] getAttributionTitles() {
@@ -93,6 +94,12 @@ public class AttributionDialogManager implements View.OnClickListener, DialogInt
     }
   }
 
+  public void onStop() {
+    if (dialog != null && dialog.isShowing()) {
+      dialog.dismiss();
+    }
+  }
+
   private boolean isLatestEntry(int attributionKeyIndex) {
     return attributionKeyIndex == getAttributionTitles().length - 1;
   }

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

@@ -69,6 +69,7 @@ public class MapView extends FrameLayout implements NativeMapView.ViewCallback {
   private NativeMapView nativeMapView;
   @Nullable
   private MapboxMap mapboxMap;
+  private AttributionClickListener attributionClickListener;
   private MapboxMapOptions mapboxMapOptions;
   private MapRenderer mapRenderer;
   private boolean destroyed;
@@ -180,7 +181,7 @@ public class MapView extends FrameLayout implements NativeMapView.ViewCallback {
     mapboxMap.injectLocationComponent(new LocationComponent(mapboxMap));
 
     // inject widgets with MapboxMap
-    attrView.setOnClickListener(new AttributionClickListener(context, mapboxMap));
+    attrView.setOnClickListener(attributionClickListener = new AttributionClickListener(context, mapboxMap));
 
     // Ensure this view is interactable
     setClickable(true);
@@ -379,6 +380,8 @@ public class MapView extends FrameLayout implements NativeMapView.ViewCallback {
    */
   @UiThread
   public void onStop() {
+    attributionClickListener.onStop();
+
     if (mapboxMap != null) {
       // map was destroyed before it was started
       mapGestureDetector.cancelAnimators();
@@ -731,7 +734,7 @@ public class MapView extends FrameLayout implements NativeMapView.ViewCallback {
 
   /**
 
-  /**
+   /**
    * Set a callback that's invoked when the style has finished loading.
    *
    * @param listener The callback that's invoked when the style has finished loading
@@ -1219,11 +1222,19 @@ public class MapView extends FrameLayout implements NativeMapView.ViewCallback {
 
     @Override
     public void onClick(View v) {
+      getDialogManager().onClick(v);
+    }
+
+    public void onStop() {
+      getDialogManager().onStop();
+    }
+
+    private AttributionDialogManager getDialogManager() {
       AttributionDialogManager customDialogManager = uiSettings.getAttributionDialogManager();
       if (customDialogManager != null) {
-        uiSettings.getAttributionDialogManager().onClick(v);
+        return uiSettings.getAttributionDialogManager();
       } else {
-        defaultDialogManager.onClick(v);
+        return defaultDialogManager;
       }
     }
   }

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

@@ -538,7 +538,7 @@ public final class UiSettings {
    *
    * @return the active manager class used for showing attribution
    */
-  @NonNull
+  @Nullable
   public AttributionDialogManager getAttributionDialogManager() {
     return attributionDialogManager;
   }