Add class picker to Android UI

android/java/lib/src/main/java/com/mapbox/mapboxgl/lib/MapView.java

@@ -24,6 +24,7 @@ import android.view.SurfaceHolder;
 import android.view.SurfaceView;
 import android.view.View;
 import android.view.ViewConfiguration;
+import android.widget.ArrayAdapter;
 import android.widget.ZoomButtonsController;
 
 import com.almeros.android.multitouch.gesturedetectors.RotateGestureDetector;
@@ -358,6 +359,28 @@ public class MapView extends SurfaceView {
         mNativeMapView.setClasses(classes);
     }
 
+    public void addClass(String clazz) {
+        mNativeMapView.addClass(clazz);
+    }
+
+    public void removeClass(String clazz) {
+        mNativeMapView.removeClass(clazz);
+    }
+
+    public boolean hasClass(String clazz) {
+        return mNativeMapView.hasClass(clazz);
+    }
+
+    public void removeAllClasses() {
+        removeAllClasses(0);
+    }
+
+    public void removeAllClasses(long transitionDuration) {
+        mNativeMapView.setDefaultTransitionDuration(transitionDuration);
+        ArrayList<String> classes = new ArrayList<String>(0);
+        setClasses(classes);
+    }
+
     //
     // Lifecycle events
     //
@@ -1145,7 +1168,6 @@ public class MapView extends SurfaceView {
         }
     }
 
-
     // Called when our Internet connectivity has changed
     private void onConnectivityChanged(boolean isConnected) {
         Log.v(TAG, "onConnectivityChanged: " + isConnected);