Android利用RecyclerView实现全选、置顶和拖拽功能示例

发布时间：2020-08-23 16:26:42 来源：脚本之家阅读：789 作者：爱开发栏目：移动开发

前言

今天给大家分享是如何在RecyclerView实现全选，ItemTouchHelper实现侧滑删除,拖拽功能。比较基础。关于RecyclerView的强大，就不多说了。在Android L SDK发布的新API中最有意思的就是RecyclerView 和 CardView了，按照官方的说法， RecyclerView 一个ListView 的一个更高级更灵活的一个版本，可以自定义的东西太多了。

效果：

Android利用RecyclerView实现全选、置顶和拖拽功能示例
RecyclerView实现全选，ItemTouchHelper实现侧滑删除,拖拽功能

使用RecyclerView，首先我们需要依赖

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

项目结构:

Android利用RecyclerView实现全选、置顶和拖拽功能示例
项目结构

主要是把选择的存储在HashMap记录下来，通知用eventbus发送。下面我们一步一步来实现这种效果.

方法如下

1、我们新建一个MainActivity 布局

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);
 }
}

2、我们建一个ListAdapter适配器

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;
 }
}

3、我们新建实体Book和SelectEvent

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;
 }
}

4、建立checkbox_selector.xml选中样式

<?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>

5、建立一个activity_main.xml布局

<?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>

activity_main_item布局

<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>

这样关于RecyclerView实现全选，ItemTouchHelper实现侧滑删除,拖拽功能就完成了。

示例代码下载：

项目地址：https://github.com/88ios/RecyclerViewCheckAll

本地下载：点击这里

总结

以上就是这篇文章的全部内容了，希望本文的内容对各位Android开发者们能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对亿速云的支持。

向AI问一下细节

Android利用RecyclerView实现全选、置顶和拖拽功能示例

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