Update BannerActivity.java

Author: chenqiuwei

app/src/main/java/com/huawei/hms/ads/sdk/BannerActivity.java

@@ -36,7 +36,7 @@
  * Activity for displaying a banner ad.
  */
 public class BannerActivity extends BaseActivity {
-    private static final int REFRESH_TIME = 30;
+    private static final int REFRESH_TIME = 60;
 
     private BannerView bannerView;