避免重复调用

lzjin · Apr 4, 2020 · 561ac58 · 561ac58
1 parent e55a1df
commit 561ac58
Show file tree

Hide file tree

Showing 3 changed files with 46 additions and 42 deletions.
diff --git a/app/src/androidTest/java/com/lzj/gallery/ExampleInstrumentedTest.java b/app/src/androidTest/java/com/lzj/gallery/ExampleInstrumentedTest.java
@@ -19,7 +19,7 @@ public class ExampleInstrumentedTest {
     @Test
     public void useAppContext() throws Exception {
         // Context of the app under test.
-        Context appContext = InstrumentationRegistry.getTargetContext();
+        Context appContext = InstrumentationRegistry.getInstrumentation().getContext();
 
         assertEquals("com.lzj.gallery", appContext.getPackageName());
     }

diff --git a/app/src/main/java/com/lzj/gallery/adapter/RecyclerViewAdpter.java b/app/src/main/java/com/lzj/gallery/adapter/RecyclerViewAdpter.java
@@ -14,31 +14,25 @@
 
 import java.util.List;
 
-public class RecyclerViewAdpter extends RecyclerView.Adapter<RecyclerViewAdpter.ViewHolder> {
+public class RecyclerViewAdpter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
     public Context context;
     public List<String> datas;
     public List<String> urls;
-    private  BannerViewPager banner = null;
-
+    private boolean isShow;
     public static final int TYPE_HEADER = 0;
     public static final int TYPE_NORMAL = 1;
-    private View mHeaderView;
+
 
     public RecyclerViewAdpter(Context context, List<String> datas, List<String> url) {
         this.context = context;
         this.datas = datas;
         this.urls = url;
     }
 
-    public void addHeaderView(View headerView) {
-        mHeaderView = headerView;
-        notifyItemInserted(0);
-    }
-
 
     @Override
     public int getItemViewType(int position) {
-        if (mHeaderView != null && position == 0) {
+        if (position == 0) {
             return TYPE_HEADER;
         } else {
             return TYPE_NORMAL;
@@ -47,49 +41,59 @@ public int getItemViewType(int position) {
 
     @NonNull
     @Override
-    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
         //头部轮播
-        if (mHeaderView != null && viewType == TYPE_HEADER) {
-            mHeaderView = LayoutInflater.from(context).inflate(R.layout.tab_item_header, parent, false);
-            return new ViewHolder(mHeaderView);
+        if (viewType==TYPE_HEADER){
+            View headerView = LayoutInflater.from(context).inflate(R.layout.tab_item_header, parent, false);
+            return new HeaderViewHolder(headerView);
         }
+
         View view = LayoutInflater.from(context).inflate(R.layout.tab_item, parent, false);
-        ViewHolder viewHolder = new ViewHolder(view);
-        return viewHolder;
+        return new ViewHolder(view);
     }
 
-    @Override
-    public void onBindViewHolder(@NonNull ViewHolder viewHolder, final int position) {
-        if (getItemViewType(position) == TYPE_HEADER) {
-            if (banner == null) {
-                banner = mHeaderView.findViewById(R.id.item_header_banner);
-                banner.initBanner(urls, true)//关闭3D画廊效果
-                        .addPageMargin(10, 50)//参数1page之间的间距,参数2中间item距离边界的间距
-                        .addPointMargin(6)//添加指示器
-                        .addPointBottom(7)
-                        .finishConfig()//这句必须加
-                        .addBannerListener(new BannerViewPager.OnClickBannerListener() {
-                            @Override
-                            public void onBannerClick(int position) {
-                            }
-                        });
-            }
-            return;
 
-        } else {
-            viewHolder.tv.setText(datas.get(position - 1));
+    @Override
+    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, final int position) {
+        switch (getItemViewType(position)){
+            case TYPE_HEADER:
+                if (!isShow) {
+                    ((HeaderViewHolder) viewHolder).bannerx.initBanner(urls, true)//关闭3D画廊效果
+                            .addPageMargin(10, 50)//参数1page之间的间距,参数2中间item距离边界的间距
+                            .addPointMargin(6)//添加指示器
+                            .addPointBottom(7)
+                            .finishConfig()//这句必须加
+                            .addBannerListener(new BannerViewPager.OnClickBannerListener() {
+                                @Override
+                                public void onBannerClick(int position) {
+                                }
+                            });
+                    isShow=true;
+                }
+                break;
+            case TYPE_NORMAL:
+                ((ViewHolder)viewHolder).tv.setText(datas.get(position - 1));
+                break;
         }
     }
 
     @Override
     public int getItemCount() {
-        return mHeaderView == null ? datas.size() : datas.size() + 1;
+        return  datas.size() + 1;
+    }
+
+
+    static  class HeaderViewHolder extends RecyclerView.ViewHolder {
+        BannerViewPager bannerx;
+        HeaderViewHolder(@NonNull View itemView) {
+            super(itemView);
+            bannerx=itemView.findViewById(R.id.item_header_banner);
+        }
     }
 
     //继承RecyclerView.ViewHolder抽象类的自定义ViewHolder
     static class ViewHolder extends RecyclerView.ViewHolder {
         TextView tv;
-
         ViewHolder(View itemView) {
             super(itemView);
             tv = itemView.findViewById(R.id.tv);

diff --git a/app/src/main/java/com/lzj/gallery/fragment/TabFragmentOne.java b/app/src/main/java/com/lzj/gallery/fragment/TabFragmentOne.java
@@ -73,10 +73,10 @@ private void initAdpter() {
         mViewAdpter=new RecyclerViewAdpter(getActivity(),list,urlList);
         recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));//listview效果
         recyclerView.setAdapter(mViewAdpter);
-
-        View header=LayoutInflater.from(getActivity()).inflate(R.layout.tab_item_header,recyclerView,false);
-        mViewAdpter.addHeaderView(header);
-        mViewAdpter.notifyDataSetChanged();
+//
+//        View header=LayoutInflater.from(getActivity()).inflate(R.layout.tab_item_header,recyclerView,false);
+//        mViewAdpter.addHeaderView(header);
+//        mViewAdpter.notifyDataSetChanged();
 
     }
 }