* [android] fix : list OOM cause by viewHolder cache，set the upper limit for the viewHolder cache pool

android/sdk/src/main/java/com/taobao/weex/dom/WXRecyclerDomObject.java

@@ -91,10 +91,14 @@ public void preCalculateCellWidth(){
             } else if (Constants.Value.AUTO != mColumnWidth && Constants.Value.AUTO == mColumnCount) {
                 mColumnCount = Math.round((mAvailableWidth + mColumnGap) / (mColumnWidth + mColumnGap)-0.5f);
                 mColumnCount = mColumnCount > 0 ? mColumnCount :1;
+                if (mColumnCount <= 0)
+                    mColumnCount = Constants.Value.COLUMN_COUNT_NORMAL;
                 mColumnWidth =((mAvailableWidth + mColumnGap) / mColumnCount) - mColumnGap;
             } else if(Constants.Value.AUTO != mColumnWidth && Constants.Value.AUTO != mColumnCount){
                 int columnCount = Math.round((mAvailableWidth + mColumnGap) / (mColumnWidth + mColumnGap)-0.5f);
                 mColumnCount = columnCount > mColumnCount ? mColumnCount :columnCount;
+                if (mColumnCount <= 0)
+                    mColumnCount = Constants.Value.COLUMN_COUNT_NORMAL;
                 mColumnWidth= ((mAvailableWidth + mColumnGap) / mColumnCount) - mColumnGap;
             }
             mIsPreCalculateCellWidth = true;

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

@@ -317,16 +317,9 @@ protected T initComponentHostView(@NonNull Context context) {
       public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
         super.onScrollStateChanged(recyclerView, newState);
 
-        if (newState == RecyclerView.SCROLL_STATE_IDLE) {
-          for (ListBaseViewHolder holder : recycleViewList) {
-            if (holder != null
-                && holder.getComponent() != null
-                && !holder.getComponent().isUsing()) {
-               holder.recycled();
-            }
-          }
-          recycleViewList.clear();
-        }
+        if (newState == RecyclerView.SCROLL_STATE_IDLE)
+          recycleViewHolderList();
+
         List<OnWXScrollListener> listeners = getInstance().getWXScrollListeners();
         if (listeners != null && listeners.size() > 0) {
           for (OnWXScrollListener listener : listeners) {
@@ -382,6 +375,17 @@ public void onGlobalLayout() {
     return bounceRecyclerView;
   }
 
+  private void recycleViewHolderList() {
+    for (ListBaseViewHolder holder : recycleViewList) {
+      if (holder != null
+              && holder.getComponent() != null
+              && !holder.getComponent().isUsing()) {
+        holder.recycled();
+      }
+    }
+    recycleViewList.clear();
+  }
+
   @Override
   public void bindStickStyle(WXComponent component) {
     stickyHelper.bindStickStyle(component, mStickyMap);
@@ -833,6 +837,12 @@ public void onViewRecycled(ListBaseViewHolder holder) {
     holder.setComponentUsing(false);
     if(holder.canRecycled()) {
       recycleViewList.add(holder);
+
+      /**
+       * Recycle cache{@link recycleViewList} when recycleViewList.size() > list max child count
+       */
+      if (recycleViewList.size() > getChildCount() + 1)
+        recycleViewHolderList();
     } else {
       WXLogUtils.w(TAG, "this holder can not be allowed to  recycled" );
     }

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

@@ -90,6 +90,14 @@ public void addChild(WXComponent child, int index) {
       return;
     }
     setRefreshOrLoading(child);
+
+    // Synchronize DomObject's attr to Component and Native View
+    if(mDomObject.getColumnWidth() != mColumnWidth ||
+            mDomObject.getColumnCount() != mColumnCount ||
+            mDomObject.getColumnGap() != mColumnGap) {
+      updateRecyclerAttr();
+      getHostView().getInnerView().initView(getContext(), mLayoutType,mColumnCount,mColumnGap,getOrientation());
+    }
   }