fix(Android): fix memory leak

android/hummer-component/src/main/java/com/didi/hummer/component/list/HMListAdapter.java

@@ -20,6 +20,7 @@ public class HMListAdapter extends RecyclerView.Adapter<HMListAdapter.ViewHolder
     private JSCallback typeCallback;
     private JSCallback createCallback;
     private JSCallback updateCallback;
+    private RecycleViewPoolCallback recycleViewPoolCallback;
 
     private Context mContext;
 
@@ -42,6 +43,10 @@ public void destroy() {
         }
     }
 
+    public void setRecycleViewPoolCallback(RecycleViewPoolCallback callback){
+        recycleViewPoolCallback = callback;
+    }
+
     @Override
     public void onAttachedToRecyclerView(RecyclerView recyclerView) {
         super.onAttachedToRecyclerView(recyclerView);
@@ -56,16 +61,19 @@ public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
 
     @Override
     public int getItemViewType(int position) {
-        if (typeCallback == null) {
-            return super.getItemViewType(position);
+        int viewType = super.getItemViewType(position);;
+        if (typeCallback != null) {
+            Object retType = typeCallback.call(position);
+            if (retType != null) {
+                viewType = ((Number) retType).intValue();
+            }
         }
 
-        Object retType = typeCallback.call(position);
-        if (retType == null) {
-            return super.getItemViewType(position);
+        if(recycleViewPoolCallback != null){
+            recycleViewPoolCallback.updatePoolSize(viewType);
         }
 
-        return ((Number) retType).intValue();
+        return viewType;
     }
 
     @NonNull

android/hummer-component/src/main/java/com/didi/hummer/component/list/List.java

@@ -43,6 +43,7 @@
 
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.util.HashSet;
 import java.util.Map;
 
 /**
@@ -52,6 +53,8 @@
  */
 @Component("List")
 public class List extends HMBase<SmartRefreshLayout> {
+    private final static int MAX_RECYCLE_POOL_SIZE = 100;
+
     private static final int MODE_LIST = 1;
     private static final int MODE_GRID = 2;
     private static final int MODE_WATERFALL = 3;
@@ -92,6 +95,20 @@ public class List extends HMBase<SmartRefreshLayout> {
     private int scrollOffsetX = 0;
     private int scrollOffsetY = 0;
 
+    private HashSet<Integer> registeredViewType;
+    private RecycleViewPoolCallback recycleViewPoolCallback = new RecycleViewPoolCallback() {
+        @Override
+        public void updatePoolSize(int viewType) {
+            if(registeredViewType == null){
+                registeredViewType = new HashSet<>();
+            }
+            if(!registeredViewType.contains(viewType)){
+                recyclerView.getRecycledViewPool().setMaxRecycledViews(viewType, MAX_RECYCLE_POOL_SIZE);
+                registeredViewType.add(viewType);
+            }
+        }
+    };
+
     private RecyclerView.OnScrollListener mOnScrollListener = new RecyclerView.OnScrollListener() {
         @Override
         public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
@@ -171,6 +188,7 @@ public List(HummerContext context, JSValue jsValue, String viewID) {
     protected SmartRefreshLayout createViewInstance(Context context) {
         // 这里不用代码new一个RecyclerView，而是通过xml，是为了解决设置scrollerbar显示无效的问题
         recyclerView = (RecyclerView) LayoutInflater.from(context).inflate(R.layout.recycler_view, null, false);
+
         recyclerView.setOverScrollMode(View.OVER_SCROLL_NEVER);
         recyclerView.setClipChildren(false);
         recyclerView.setOnTouchListener((v, event) -> {
@@ -243,6 +261,7 @@ public void onCreate() {
         super.onCreate();
         recyclerView.addOnScrollListener(mOnScrollListener);
         adapter = new HMListAdapter(getContext(), instanceManager);
+        adapter.setRecycleViewPoolCallback(recycleViewPoolCallback);
         recyclerView.setAdapter(adapter);
 
         recyclerViewNode = YogaNodeUtil.createYogaNode();

android/hummer-component/src/main/java/com/didi/hummer/component/list/RecycleViewPoolCallback.java

@@ -0,0 +1,5 @@
+package com.didi.hummer.component.list;
+
+interface RecycleViewPoolCallback {
+    void updatePoolSize(int viewType);
+}