Android利用RecyclerView实现全选、置顶和拖拽功能示例

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：

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:

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，谢谢大家对的支持。