Android RecyclerView仿新闻头条的频道管理功能

需要在build里添加依赖

 compile 'com.android.support:recyclerview-v7:25.3.1'

布局文件activity_main

<android.support.v7.widget.recyclerview
    android:layout_weight="1"
    android:id="@+id/recyclerview_up"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
  </android.support.v7.widget.recyclerview>
  <!--用来划分上下的频道-->
  <view
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="#999999">
  </view>
  <android.support.v7.widget.recyclerview
    android:layout_weight="1"
    android:id="@+id/recyclerview_down"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
  </android.support.v7.widget.recyclerview>

在layout下定义一个message.xml布局文件,用来显示recyclerview里的文字,跟listview的意义差不多

 <textview
    android:id="@+id/textview"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    android:padding="3dp"
    android:text="123123123" />

写一个 myitemonclicklistener 接口用来监听点击事件,在里边传入两个参数,第一个是试图,第二是点击的下标

public interface myitemonclicklistener {
  void onclick(view view,int position);
}

recyclerview的适配器类

//recyclerview.adapter<?>里写的是优化继承viewholder的帮助类
public class viewadapter extends recyclerview.adapter<viewadapter.myviewholder> {
  private context mcontext;
  /**
  *特别注意一下mlist后面一定要默认赋值,不然运行的时候会报错,因为我们默认上面的recyclerview是没有添加数据的 
  */
  private list<string> mlist=new arraylist<>();
  private myitemonclicklistener myitemonclicklistener;
  public viewadapter(context context) {
    this.mcontext = context;
  }
  //传数组的方法
  public void setmessage(list<string> list) {
    this.mlist = list;
  }
  //写个方法把接口传过来
  public void setmyitemonclicklistener(myitemonclicklistener myitemonclicklistener) 
  {
    this.myitemonclicklistener = myitemonclicklistener;
  }
  @override
  public myviewholder oncreateviewholder(viewgroup parent, int viewtype) {
    //打气筒填充我们自定义的message.xml的试图
    view view = view.inflate(mcontext, r.layout.messgae, null);
    //优化
    final myviewholder holder = new myviewholder(view);
    //监听
    view.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        //调用我们自定义接口的方法
        myitemonclicklistener.onclick(v, holder.getlayoutposition());
      }
    });
    return holder;
  }
  @override
  public void onbindviewholder(myviewholder holder, int position) {
    myviewholder viewholder = holder;
    viewholder.textview.settext(mlist.get(position));
  }
  @override
  public int getitemcount() {
    return mlist.size();
  }
  //viewholder优化
  static class myviewholder extends recyclerview.viewholder {
    private textview textview;
    public myviewholder(view itemview) {
      super(itemview);
      textview = (textview) itemview.findviewbyid(r.id.textview);
    }
  }
}

在mainactivity的实现

public class mainactivity extends appcompatactivity {
  private recyclerview recyclerview_up;
  private recyclerview recyclerview_down;
  private list<string> listup = new arraylist<>();
  private list<string> listdown = new arraylist<>();
  private viewadapter adapterup;
  private viewadapter adapterdown;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    //添加数据
    initdata();
    initview();
  }
  //添加数据
    for (int i = 0; i < 15; i++) {
    //默认的我们只给下面的recyclerview添加了数据
      listdown.add("频道管理" + i);
    }
  }
  private void initview() {
    recyclerview_up = (recyclerview) findviewbyid(r.id.recyclerview_up);
    recyclerview_down = (recyclerview) findviewbyid(r.id.recyclerview_down);
    initup();
    initdown();
  }
  private void initup() {
    //创建适配器
    adapterup = new viewadapter(mainactivity.this);
    //添加数据,我们默认创建的时候是空的
    adapterup.setmessage(listup);
    recyclerview_up.setadapter(adapterup);
    //recyclerview显示样式
    gridlayoutmanager gridlayoutmanagerup = new gridlayoutmanager(this, 3);
    recyclerview_up.setlayoutmanager(gridlayoutmanagerup);
    //点击监听
    adapterup.setmyitemonclicklistener(new myitemonclicklistener() {
      @override
      public void onclick(view view, int position) {
        log.e("up", "上" + position);
        //下面的recyclerview添加当前点击的条目信息并刷新数组
        listdown.add(listup.get(position));
        adapterdown.setmessage(listdown);
        adapterdown.notifydatasetchanged();
        //从当前数组移除数据并刷新数组
        listup.remove(position);
        adapterup.setmessage(listup);
        adapterup.notifydatasetchanged();
      }
    });
  }
  private void initdown() {
    adapterdown = new viewadapter(mainactivity.this);
    adapterdown.setmessage(listdown);
    recyclerview_down.setadapter(adapterdown);
    gridlayoutmanager gridlayoutmanagerdown = new gridlayoutmanager(this, 3);
    recyclerview_down.setlayoutmanager(gridlayoutmanagerdown);
    adapterdown.setmyitemonclicklistener(new myitemonclicklistener() {
      @override
      public void onclick(view view, int position) {
        log.e("down", "下" + position);
        //下面的recyclerview添加当前点击的条目信息并刷新数组
        listup.add(listdown.get(position));
        adapterup.setmessage(listup);
        adapterup.notifydatasetchanged();
        //从当前数组移除数据并刷新数组
        listdown.remove(position);
        adapterdown.setmessage(listdown);
        adapterdown.notifydatasetchanged();
      }
    });
  }
}

以上所述是小编给大家介绍的android recyclerview仿新闻头条的频道管理功能，希望对大家有所帮助