[Android] Fix potential NPE (#2662)

apache · Jul 9, 2019 · 159ccdc · 159ccdc
1 parent ce01b5b
commit 159ccdc
Showing 1 changed file with 2 additions and 4 deletions.
diff --git a/android/sdk/src/main/java/com/taobao/weex/ui/view/WXHorizontalScrollView.java b/android/sdk/src/main/java/com/taobao/weex/ui/view/WXHorizontalScrollView.java
@@ -24,12 +24,10 @@
 import android.view.MotionEvent;
 import android.view.View;
 import android.widget.HorizontalScrollView;
-
 import com.taobao.weex.ui.view.gesture.WXGesture;
 import com.taobao.weex.ui.view.gesture.WXGestureObservable;
-
-import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 public class WXHorizontalScrollView extends HorizontalScrollView implements IWXScroller, WXGestureObservable {
 
@@ -77,7 +75,7 @@ public void destroy() {
 
   public void addScrollViewListener(ScrollViewListener scrollViewListener) {
     if (mScrollViewListeners == null) {
-      mScrollViewListeners = new ArrayList<>();
+      mScrollViewListeners = new CopyOnWriteArrayList<>();
     }
     if (!mScrollViewListeners.contains(scrollViewListener)) {
       mScrollViewListeners.add(scrollViewListener);