完善缓存和状态恢复

Author: GcsSloop

diycode-app/src/main/java/com/gcssloop/diycode/fragment/RefreshRecyclerFragment.java

@@ -76,6 +76,8 @@ public abstract class RefreshRecyclerFragment<T, Event extends BaseEvent<List<T>
     private HeaderFooterAdapter mAdapter;
     private FooterProvider mFooterProvider;
 
+    protected boolean isFirstAddFooter = true;
+
     @Override
     protected int getLayoutId() {
         return R.layout.fragment_refresh_recycler;
@@ -88,7 +90,10 @@ protected void initViews(ViewHolder holder, View root) {
         mFooterProvider = new FooterProvider(getContext()) {
             @Override
             public void needLoadMore() {
-                super.needLoadMore();
+                if (isFirstAddFooter){
+                    isFirstAddFooter = false;
+                    return;
+                }
                 loadMore();
             }
         };
@@ -112,6 +117,7 @@ public void onRefresh() {
                 refresh();
             }
         });
+        initData(mAdapter);
     }
 
     protected void refresh() {

diycode-app/src/main/java/com/gcssloop/diycode/fragment/TopicListFragment.java

@@ -40,11 +40,10 @@
 import com.gcssloop.diycode_sdk.log.Logger;
 import com.gcssloop.recyclerview.adapter.multitype.HeaderFooterAdapter;
 
-public class TopicListFragment extends RefreshRecyclerFragment<Topic, GetTopicsListEvent> {
+import java.util.ArrayList;
+import java.util.List;
 
-    // RecyclerView 滚动位置保存与恢复
-    private int lastPosition = 0;
-    private int lastOffset = 0;
+public class TopicListFragment extends RefreshRecyclerFragment<Topic, GetTopicsListEvent> {
 
     private boolean isFirstLaunch = true;
     // 数据
@@ -69,20 +68,23 @@ public void onCreate(@Nullable Bundle savedInstanceState) {
 
     @Override
     public void initData(HeaderFooterAdapter adapter) {
-        /*
         List<Topic> topics = mDataCache.getTopicsList();
         if (null != topics && topics.size() > 0) {
-            // TODO 恢复Index
+            Logger.e("topics : " + topics.size());
+            pageIndex = mConfig.getTopicListPageIndex();
             adapter.addDatas(topics);
-            // 设置底部
             if (isFirstLaunch) {
-                // TODO 滚动到上次到位置
+                int lastPosition = mConfig.getTopicListLastPosition();
+                int lastOffset = mConfig.getTopicListLastOffset();
+                if (lastPosition != 0) {
+                    mRecyclerView.getLayoutManager().scrollToPosition(lastPosition);
+                }
+                isFirstAddFooter = false;
                 isFirstLaunch = false;
             }
         } else {
             loadMore();
-        }*/
-        loadMore();
+        }
     }
 
     @Override
@@ -110,12 +112,14 @@ protected void onRefresh(GetTopicsListEvent event, HeaderFooterAdapter adapter)
         adapter.clearDatas();
         adapter.addDatas(event.getBean());
         toast("刷新成功");
+        mDataCache.saveTopicsList(convert(adapter.getDatas()));
     }
 
     @Override
     protected void onLoadMore(GetTopicsListEvent event, HeaderFooterAdapter adapter) {
         adapter.addDatas(event.getBean());
         toast("加载更多成功");
+        mDataCache.saveTopicsList(convert(adapter.getDatas()));
     }
 
     @Override
@@ -127,6 +131,16 @@ protected void onError(GetTopicsListEvent event, String postType) {
         }
     }
 
+    @SuppressWarnings("unchecked")
+    public ArrayList<Topic> convert(List<Object> objects) {
+        ArrayList<Topic> topics = new ArrayList<>();
+        for (Object obj : objects) {
+            if (obj instanceof Topic)
+                topics.add((Topic) obj);
+        }
+        return topics;
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
@@ -136,10 +150,13 @@ public void onDestroyView() {
     // 保存状态
     private void saveState() {
         // 存储 PageIndex
+        mConfig.saveTopicListPageIndex(pageIndex);
+        // 存储 RecyclerView 滚动位置
         RecyclerView.LayoutManager layoutManager = mRecyclerView.getLayoutManager();
         View view = layoutManager.getChildAt(0);
-        lastPosition = layoutManager.getPosition(view);
-        lastOffset = view.getTop();
+        int lastPosition = layoutManager.getPosition(view);
+        int lastOffset = view.getTop();
+        mConfig.saveTopicListState(lastPosition, lastOffset);
         Logger.e("onDestroyView", lastPosition + " : " + lastOffset);
     }
 }

diycode-app/src/main/java/com/gcssloop/diycode/utils/Config.java

@@ -106,23 +106,29 @@ public Integer getMainViewPagerPosition() {
 
     //--- Topic状态 ------------------------------------------------------------------------------
 
-    private String Key_TopicList_LastScroll = "Key_TopicList_LastScroll";
+    private String Key_TopicList_LastPosition = "Key_TopicList_LastPosition";
+    private String Key_TopicList_LastOffset = "Key_TopicList_LastOffset";
 
-    public void saveTopicListScroll(Integer lastScrollY) {
-        saveData(Key_TopicList_LastScroll, lastScrollY);
+    public void saveTopicListState(Integer lastPosition, Integer lastOffset) {
+        saveData(Key_TopicList_LastPosition, lastPosition);
+        saveData(Key_TopicList_LastOffset, lastOffset);
     }
 
-    public Integer getTopicLastScroll() {
-        return getData(Key_TopicList_LastScroll, 0);
+    public Integer getTopicListLastPosition() {
+        return getData(Key_TopicList_LastPosition, 0);
+    }
+
+    public Integer getTopicListLastOffset() {
+        return getData(Key_TopicList_LastOffset, 0);
     }
 
     private String Key_TopicList_PageIndex = "Key_TopicList_PageIndex";
 
-    public void saveTopicListPageIndex(Integer pageIndex){
+    public void saveTopicListPageIndex(Integer pageIndex) {
         saveData(Key_TopicList_PageIndex, pageIndex);
     }
 
-    public Integer getTopicListPageIndex(){
+    public Integer getTopicListPageIndex() {
         return getData(Key_TopicList_PageIndex, 0);
     }
 
@@ -140,11 +146,11 @@ public Integer getNewsLastScroll() {
 
     private String Key_NewsList_PageIndex = "Key_NewsList_PageIndex";
 
-    public void saveNewsListPageIndex(Integer pageIndex){
+    public void saveNewsListPageIndex(Integer pageIndex) {
         saveData(Key_NewsList_PageIndex, pageIndex);
     }
 
-    public Integer getNewsListPageIndex(){
+    public Integer getNewsListPageIndex() {
         return getData(Key_NewsList_PageIndex, 0);
     }
 }