RecyclerView 和 ListView 使用对比分析

Author: D-clock

README.md

@@ -2,16 +2,16 @@
 
 本代码库整理总结 Android 系统自身UI特性，主要包含**代码实践**和**特性总结**两方面的内容。有兴趣的朋友欢迎fork、star、watch。
 
-## 最新更新 （最后编辑于 2016-07-29）
+## 最新更新 （最后编辑于 2016-08-08）
 
-- 新增 Material Design 系列控件的体验，其中包括 RecyclerView、SnackBar、FloatingActionButton、AppBarLayout、CardView、CoordinatorLayout、CollapsingToolbarLayout、BottomSheets 等
-- 写一点个人感想，Android L 之后，嵌套滚动机制的应用越发重要了都。。。。。。。。
+- 新增 RecyclerView 和 ListView 使用对比分析
 
 ## 实践总结
 
 - [Translucent System Bar 的最佳实践](note/00_AndroidSystemUI：TranslucentBar特性的使用.md)
 - [最详细的 Toolbar 开发实践总结](note/01_AndroidSystemUI：ToolBar特性的使用.md)
 - [最详细的 NavigationDrawer 开发实践总结](note/02_AndroidSystemUI：NavigationDrawe特性的使用.md)
+- [RecyclerView 和 ListView使用对比分析](note/03_AndroidSystemUI：RecyclerView和ListView使用对比分析.md)
 
 ## 参考文章
 

note/03_AndroidSystemUI：RecyclerView和ListView使用对比分析.md

@@ -6,9 +6,11 @@
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.StaggeredGridLayoutManager;
+import android.support.v7.widget.helper.ItemTouchHelper;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
+import android.view.MotionEvent;
 
 import com.clock.systemui.R;
 import com.clock.systemui.adapter.AuthorRecyclerAdapter;
@@ -69,6 +71,21 @@ public boolean onOptionsItemSelected(MenuItem item) {
         } else if (itemId == R.id.delete_item) {
             mRecyclerAdapter.notifyItemChanged(3);
 
+        } else if (itemId == R.id.update_item) {
+            RecyclerView.LayoutManager layoutManager = mRecyclerView.getLayoutManager();
+            if (layoutManager instanceof LinearLayoutManager) {
+                LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
+                int position = linearLayoutManager.findFirstCompletelyVisibleItemPosition();//获取第一个完全可见的Item的位置
+                if (RecyclerView.NO_POSITION != position) {
+                    AuthorInfo authorInfo = mAuthorInfoList.get(position);
+                    authorInfo.setNickName("Android");
+                    authorInfo.setMotto("I am Android Man!");
+                    authorInfo.setPortrait(R.mipmap.ic_launcher);
+                    mRecyclerAdapter.notifyItemChanged(position);
+                }
+
+            }
+
         }
         return super.onOptionsItemSelected(item);
     }
@@ -101,5 +118,68 @@ private void initView() {
         mRecyclerView.setLayoutManager(linearLayoutManager);
         mRecyclerAdapter.setSmallType(false);
         mRecyclerView.setAdapter(mRecyclerAdapter);
+        //ItemTouchHelper 用于实现 RecyclerView Item 拖曳效果的类
+        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
+
+            @Override
+            public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
+                //actionState : action状态类型，有三类 ACTION_STATE_DRAG （拖曳），ACTION_STATE_SWIPE（滑动），ACTION_STATE_IDLE（静止）
+                int dragFlags = makeFlag(ItemTouchHelper.ACTION_STATE_DRAG, ItemTouchHelper.UP | ItemTouchHelper.DOWN
+                        | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT);//支持上下左右的拖曳
+                int swipeFlags = makeMovementFlags(ItemTouchHelper.ACTION_STATE_SWIPE, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT);//表示支持左右的滑动
+                return makeMovementFlags(dragFlags, swipeFlags);//直接返回0表示不支持拖曳和滑动
+            }
+
+            /**
+             * @param recyclerView attach的RecyclerView
+             * @param viewHolder 拖动的Item
+             * @param target 放置Item的目标位置
+             * @return
+             */
+            @Override
+            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
+                int fromPosition = viewHolder.getAdapterPosition();//要拖曳的位置
+                int toPosition = target.getAdapterPosition();//要放置的目标位置
+                mRecyclerAdapter.moveItem(fromPosition, toPosition);
+                return true;
+            }
+
+            /**
+             * @param viewHolder 滑动移除的Item
+             * @param direction
+             */
+            @Override
+            public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
+                int position = viewHolder.getAdapterPosition();//获取要滑动删除的Item位置
+                mRecyclerAdapter.removeItem(position);
+            }
+
+            @Override
+            public boolean isLongPressDragEnabled() {
+                return super.isLongPressDragEnabled();//不支持长按拖曳效果直接返回false
+            }
+
+            @Override
+            public boolean isItemViewSwipeEnabled() {
+                return super.isItemViewSwipeEnabled();//不支持滑动效果直接返回false
+            }
+        });
+        itemTouchHelper.attachToRecyclerView(mRecyclerView);
+        mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
+            @Override
+            public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
+                return false;
+            }
+
+            @Override
+            public void onTouchEvent(RecyclerView rv, MotionEvent e) {
+
+            }
+
+            @Override
+            public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
+
+            }
+        });
     }
 }

note/03_AndroidSystemUI：当ListView遇上RecyclerView.md

@@ -1,5 +1,6 @@
 package com.clock.systemui.adapter;
 
+import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
@@ -49,7 +50,8 @@ public long getItemId(int position) {
     public View getView(int position, View convertView, ViewGroup parent) {
         ViewHolder viewHolder = null;
         if (convertView == null) {
-            convertView = View.inflate(parent.getContext(), R.layout.author_info_layout, null);
+            LayoutInflater inflater = LayoutInflater.from(parent.getContext());
+            convertView = inflater.inflate(R.layout.author_info_layout, parent, false);
             viewHolder = new ViewHolder();
             viewHolder.mPortrait = (ImageView) convertView.findViewById(R.id.iv_portrait);
             viewHolder.mNickName = (TextView) convertView.findViewById(R.id.tv_nickname);

src/main/java/com/clock/systemui/activity/recycler/RecyclerDemoActivity.java

@@ -10,6 +10,7 @@
 import com.clock.systemui.R;
 import com.clock.systemui.bean.AuthorInfo;
 
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -62,6 +63,27 @@ public int getItemCount() {
         return mAuthorInfoList.size();
     }
 
+    /**
+     * 移动Item
+     *
+     * @param fromPosition
+     * @param toPosition
+     */
+    public void moveItem(int fromPosition, int toPosition) {
+        Collections.swap(mAuthorInfoList, fromPosition, toPosition);//做数据的交换
+        notifyItemMoved(fromPosition, toPosition);
+    }
+
+    /**
+     * 滑动Item
+     *
+     * @param position
+     */
+    public void removeItem(int position) {
+        mAuthorInfoList.remove(position);//删除数据
+        notifyItemRemoved(position);
+    }
+
     class AuthorViewHolder extends RecyclerView.ViewHolder {
 
         ImageView mPortraitView;

src/main/java/com/clock/systemui/adapter/AuthorListAdapter.java

@@ -20,4 +20,8 @@
     <item
         android:id="@+id/delete_item"
         android:title="删一条" />
+
+    <item
+        android:id="@+id/update_item"
+        android:title="局部刷新" />
 </menu>