Android利用RecyclerView实现全选、置顶和拖拽功能示例

 compile 'com.android.support:recyclerview-v7:23.+'

public class MainActivity extends Activity { private RecyclerView recyclerView; private CheckBox checkbox; private TextView selected; private ListAdapter adapter; private EventBus event; private boolean isChange = false; private ArrayList<Book> list = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  initView();  initData(); } private void initView() {  event = EventBus.getDefault();  event.register(this);  recyclerView = (RecyclerView) findViewById(R.id.recyclerview);  checkbox = (CheckBox) findViewById(R.id.checkbox);  selected = (TextView) findViewById(R.id.selected); } private void initData() {  for (int i = 0; i < 20; i++) {   Book model = new Book();   model.setId(i);   model.setName("商品" + i);   model.setDesc("描述" + i);   list.add(model);  }  adapter = new ListAdapter(list, event);  recyclerView.setHasFixedSize(true);  recyclerView.setAdapter(adapter);  recyclerView.setLayoutManager(new GridLayoutManager(this, 3));  checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {   @Override   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {    try {     HashMap<Integer, Boolean> map = new HashMap<Integer, Boolean>();     int count = 0;     if (isChecked) {      isChange = false;     }     for (int i = 0, p = list.size(); i < p; i++) {      if (isChecked) {       map.put(i, true);       count++;      } else {       if (!isChange) {        map.put(i, false);        count = 0;       } else {        map = adapter.getMap();        count = map.size();       }      }     }     selected.setText("已选" + count + "项");     adapter.setMap(map);    } catch (Exception e) {     e.printStackTrace();    }   }  });  adapter.setOnItemClickListener(new ListAdapter.ItemClickListener() {   @Override   public void onItemClick(RecyclerView.ViewHolder holder, int positon) {    Log.e("onItemClick", "" + positon);   }   @Override   public void onItemLongClick(final RecyclerView.ViewHolder holder, final int positon) {    Log.e("onItemLongClick", "" + positon);   }  }); } public void onEventMainThread(SelectEvent event) {  int size = event.getSize();  if (size < list.size()) {   isChange = true;   checkbox.setChecked(false);  } else {   checkbox.setChecked(true);   isChange = false;  }  selected.setText("已选" + size + "项"); } @Override protected void onDestroy() {  super.onDestroy();  event.unregister(this); }}

public class ListAdapter extends RecyclerView.Adapter<ListAdapter.ItemViewHolder> { private List<Book> mItems; private List<Book> selected; public HashMap<Integer, Boolean> map; private EventBus eventBus; public ListAdapter(List<Book> mItems, EventBus eventBus) {  this.mItems = mItems;  this.eventBus = eventBus;  map = new HashMap<>();  selected = new ArrayList<>();  init(); } private void init() {  if (null == mItems || mItems.size() <= 0) {   return;  }  for (int i = 0, p = mItems.size(); i < p; i++) {   map.put(i, false);  } } @Override public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {  View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_main_item, parent, false);  ItemViewHolder itemViewHolder = new ItemViewHolder(view);  return itemViewHolder; } @Override public void onBindViewHolder(final ItemViewHolder holder, final int position) {  if (null == mItems || mItems.size() <= 0) {   return;  }  holder.name.setText(mItems.get(position).getName());  holder.desc.setText(mItems.get(position).getDesc());  holder.checkBox.setTag(new Integer(position));//防止划回来时选中消失  if (map != null) {   ((ItemViewHolder) holder).checkBox.setChecked((map.get(position)));  } else {   ((ItemViewHolder) holder).checkBox.setChecked(false);  }  holder.checkBox.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View view) {    int mFlags = (Integer) view.getTag();    if (map != null) {     if (map.get(position)) {      map.put(position, false);      eventBus.post(new SelectEvent(selected(map)));     } else {      map.put(mFlags, Boolean.TRUE);      eventBus.post(new SelectEvent(selected(map)));     }    }   }  });  holder.itemView.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    mItemClickListener.onItemClick(holder,holder.getAdapterPosition());   }  });  holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {   @Override   public boolean onLongClick(View v) {    mItemClickListener.onItemLongClick(holder,holder.getAdapterPosition());    return true;   }  }); } private int selected(HashMap<Integer, Boolean> map) {  int size = 0;  for (Integer key : map.keySet()) {   if(map.get(key)){    size++;   }  }  return size; } @Override public int getItemCount() {  return mItems == null? 0 :mItems.size(); } public static class ItemViewHolder extends RecyclerView.ViewHolder{  public final CheckBox checkBox;  public final TextView name;  public final TextView desc;  public ItemViewHolder(View itemView) {   super(itemView);   checkBox = (CheckBox) itemView.findViewById(R.id.checkbox);   name = (TextView) itemView.findViewById(R.id.tv_name);   desc = (TextView) itemView.findViewById(R.id.tv_desc);  } } public HashMap<Integer, Boolean> getMap() {  return map; } public void setMap(HashMap<Integer, Boolean> map) {  this.map = map;  notifyDataSetChanged(); } /**  * 点击事件和长按事件  */ public interface ItemClickListener{  void onItemClick(RecyclerView.ViewHolder holder , int position);  void onItemLongClick(RecyclerView.ViewHolder holder , int position); } private ItemClickListener mItemClickListener; public void setOnItemClickListener(ItemClickListener listener){  this.mItemClickListener=listener; }}

package com.aikaifa.checkall.bean;public class Book { private int id; private String name; private String desc; public String getDesc() {  return desc; } public void setDesc(String desc) {  this.desc = desc; } public String getName() {  return name; } public void setName(String name) {  this.name = name; } public int getId() {  return id; } public void setId(int id) {  this.id = id; } public Book() { }}public class SelectEvent { private int size; public SelectEvent(int size) {  this.size = size; } public int getSize() {  return size; }}

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@mipmap/checkbox_pressed" android:state_checked="true"/> <item android:drawable="@mipmap/checkbox_normal" android:state_checked="false"/> <item android:drawable="@mipmap/checkbox_normal"/></selector>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <LinearLayout  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:orientation="horizontal">  <CheckBox   android:id="@+id/checkbox"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:drawablePadding="10dp"   android:text="全选"   android:textColor="#969696"   android:textSize="12sp" />  <TextView   android:id="@+id/selected"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_marginLeft="10dp"   android:gravity="center_vertical"   android:text="已选0项" /> </LinearLayout> <android.support.v7.widget.RecyclerView  android:id="@+id/recyclerview"  android:layout_width="match_parent"  android:layout_height="match_parent" /></LinearLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/item" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:clickable="true" android:focusable="true"> <RelativeLayout  android:id="@+id/rl_app"  android:layout_width="50dp"  android:layout_height="50dp"  android:layout_centerHorizontal="true">  <ImageView   android:id="@+id/iv"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:src="@mipmap/ic_launcher" />  <CheckBox   android:id="@+id/checkbox"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_alignParentRight="true"   android:layout_gravity="center_vertical"   android:button="@drawable/checkbox_selector" /> </RelativeLayout> <TextView  android:id="@+id/tv_name"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:layout_below="@+id/rl_app"  android:gravity="center"  android:text="name"  android:textColor="#ffffff" /> <TextView  android:id="@+id/tv_desc"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:layout_below="@+id/tv_name"  android:gravity="center"  android:textColor="#f5f5f5"  android:textSize="9sp" /></RelativeLayout>