* [android] fix flicker caused by coexistence of box-shadow and borde…

android/sdk/src/main/java/com/taobao/weex/ui/component/WXComponent.java

@@ -43,6 +43,7 @@
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewGroup.MarginLayoutParams;
+import android.view.ViewOverlay;
 import android.widget.FrameLayout;
 
 import com.alibaba.fastjson.JSONArray;
@@ -509,6 +510,8 @@ private void setComponentLayoutParams(int realWidth, int realHeight, int realLef
       setWidgetParams(widget, UIImp, rawOffset, realWidth, realHeight, realLeft, realRight, realTop,
           realBottom);
     } else if (mHost != null) {
+      // clear box shadow before host's size changed
+      clearBoxShadow();
       if (mDomObj.isFixed()) {
         setFixedHostLayoutParams(mHost, realWidth, realHeight, realLeft, realRight, realTop,
             realBottom);
@@ -520,6 +523,8 @@ private void setComponentLayoutParams(int realWidth, int realHeight, int realLef
       mPreRealLeft = realLeft;
       mPreRealTop = realTop;
       onFinishLayout();
+      // restore box shadow
+      updateBoxShadow();
     }
   }
 
@@ -759,22 +764,9 @@ protected boolean setProperty(String key, Object param) {
       case Constants.Name.BORDER_TOP_RIGHT_RADIUS:
       case Constants.Name.BORDER_BOTTOM_RIGHT_RADIUS:
       case Constants.Name.BORDER_BOTTOM_LEFT_RADIUS:
-        final Float radius = WXUtils.getFloat(param,null);
-        final String finalKey = key;
+        Float radius = WXUtils.getFloat(param,null);
         if (radius != null) {
-          if (this instanceof WXDiv && mHost != null) {
-            /* Hacked by moxun
-               Set border radius on ViewGroup will cause the Overlay to be cut and don't know why
-               Delay setting border radius can avoid the problem, and don't know why too, dog science…… */
-            mHost.postDelayed(new Runnable() {
-              @Override
-              public void run() {
-                setBorderRadius(finalKey, radius);
-              }
-            }, 64);
-          } else {
-            setBorderRadius(finalKey, radius);
-          }
+          setBorderRadius(key, radius);
         }
         return true;
       case Constants.Name.BORDER_WIDTH:
@@ -872,6 +864,15 @@ protected void updateBoxShadow() {
         return;
       }
 
+      View target = mHost;
+      if (this instanceof WXVContainer) {
+        target = ((WXVContainer) this).getBoxShadowHost();
+      }
+
+      if (target == null) {
+        return;
+      }
+
       float[] radii = new float[] {0, 0, 0, 0, 0, 0, 0, 0};
       WXStyle style = getDomObject().getStyles();
       if (style != null) {
@@ -898,12 +899,27 @@ protected void updateBoxShadow() {
           }
         }
       }
-      BoxShadowUtil.setBoxShadow(mHost, boxShadow.toString(), radii, getInstance().getInstanceViewPortWidth());
+
+      BoxShadowUtil.setBoxShadow(target, boxShadow.toString(), radii, getInstance().getInstanceViewPortWidth());
     } else {
       WXLogUtils.w("Can not resolve styles");
     }
   }
 
+  protected void clearBoxShadow() {
+    View target = mHost;
+    if (this instanceof WXVContainer) {
+      target = ((WXVContainer) this).getBoxShadowHost();
+    }
+
+    if (target != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
+      ViewOverlay overlay = target.getOverlay();
+      if (overlay != null) {
+        overlay.clear();
+      }
+    }
+  }
+
   @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
   protected void setAriaHidden(boolean isHidden) {
     View host = getHostView();

android/sdk/src/main/java/com/taobao/weex/ui/component/WXVContainer.java

@@ -18,15 +18,19 @@
  */
 package com.taobao.weex.ui.component;
 
+import android.content.Context;
 import android.content.Intent;
-import android.util.Pair;
 import android.support.annotation.Nullable;
+import android.util.Pair;
 import android.view.Menu;
 import android.view.View;
 import android.view.ViewGroup;
+
 import com.taobao.weex.WXSDKInstance;
 import com.taobao.weex.common.Constants;
 import com.taobao.weex.dom.WXDomObject;
+import com.taobao.weex.utils.WXViewUtils;
+
 import java.util.ArrayList;
 
 /**
@@ -36,6 +40,7 @@ public abstract class WXVContainer<T extends ViewGroup> extends WXComponent<T> {
 
   private static final String TAG="WXVContainer";
   protected ArrayList<WXComponent> mChildren = new ArrayList<>();
+  private BoxShadowHost mBoxShadowHost;
 
   @Deprecated
   public WXVContainer(WXSDKInstance instance, WXDomObject dom, WXVContainer parent, String instanceId, boolean isLazy) {
@@ -474,4 +479,22 @@ public void onRenderFinish(@RenderState int state) {
   /********************************
    *  end hook Activity life cycle callback
    ********************************************************/
+
+  public @Nullable View getBoxShadowHost() {
+    if (mBoxShadowHost == null) {
+      mBoxShadowHost = new BoxShadowHost(getContext());
+      WXViewUtils.setBackGround(mBoxShadowHost, null);
+      mBoxShadowHost.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
+      getHostView().addView(mBoxShadowHost);
+    }
+    getHostView().removeView(mBoxShadowHost);
+    getHostView().addView(mBoxShadowHost);
+    return mBoxShadowHost;
+  }
+
+  private class BoxShadowHost extends View {
+    public BoxShadowHost(Context context) {
+      super(context);
+    }
+  }
 }