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Android RecyclerView实现点击条目删除

2019年08月01日  | 移动技术网IT编程  | 我要评论

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本文实例为大家分享了recyclerview实现点击条目删除的具体代码，供大家参考，具体内容如下

mainactivity.java

public class mainactivity extends appcompatactivity implements view.onclicklistener{

  private button mbutton1;
  private button mbutton2;
  private button mbutton3;
  private button mbutton4;
  private button mbutton5;
  private recyclerview mrecyclerview;
  private arraylist<string> mlist;
  private linearlayoutmanager mlinearlayoutmanager;
  private rvadapter madapter;


  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);

    findviews();

    mlist = new arraylist<>();
    for (int i=0;i<20;i++){
      mlist.add(i+"item");
    }

    madapter = new rvadapter(mlist, this);
    mrecyclerview.setadapter(madapter);

    //设置分割线
    mrecyclerview.additemdecoration(new divideritemdecoration(this,divideritemdecoration.vertical));
    //设置默认布局
    mlinearlayoutmanager = new linearlayoutmanager(this, linearlayoutmanager.vertical, false);
    mrecyclerview.setlayoutmanager(mlinearlayoutmanager);

    madapter.setonitemclicklistener(new rvadapter.onitemclicklistener() {
      @override
      public void onitemclick(int position) {
        madapter.remove(position);
      }

      @override
      public void onitemlongclick(int position) {

        madapter.remove(position);
      }
    });

  }

  private void findviews() {

    mrecyclerview = findviewbyid(r.id.rv);

    mbutton1= findviewbyid(r.id.b1);
    mbutton2= findviewbyid(r.id.b2);
    mbutton3= findviewbyid(r.id.b3);
    mbutton4= findviewbyid(r.id.b4);
    mbutton5= findviewbyid(r.id.b5);

    mbutton1.setonclicklistener(this);
    mbutton2.setonclicklistener(this);
    mbutton3.setonclicklistener(this);
    mbutton4.setonclicklistener(this);
    mbutton5.setonclicklistener(this);


  }

  @override
  public void onclick(view view) {
    switch (view.getid()){
      case r.id.b1:

        madapter.adddata(3);
        mrecyclerview.scrolltoposition(0);
        break;
      case r.id.b2:

        madapter.remove(mlist.size()-1);
        break;
      case r.id.b3:

        mlinearlayoutmanager = new linearlayoutmanager(this, linearlayoutmanager.vertical, false);
        mrecyclerview.setlayoutmanager(mlinearlayoutmanager);
        break;
      case r.id.b4:

        mrecyclerview.setlayoutmanager(new gridlayoutmanager(this, 3));
        //mrecyclerview.additemdecoration(new android.support.v7.widget.divideritemdecoration(this, divideritemdecoration.horizontal));

        break;
      case r.id.b5:

        mrecyclerview.setlayoutmanager(new staggeredgridlayoutmanager(2,staggeredgridlayoutmanager.vertical));
        break;
    }
  }
}

activity_main.xml

<android.support.constraint.constraintlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".mainactivity">

  <linearlayout
    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">
      <button
        android:id="@+id/b1"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="添加"/>
      <button
        android:id="@+id/b2"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="删除"/>
      <button
        android:id="@+id/b3"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="list"/>
      <button
        android:id="@+id/b4"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="grid"/>
      <button
        android:id="@+id/b5"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="flow"/>
    </linearlayout>
    <android.support.v7.widget.recyclerview
      android:id="@+id/rv"
      android:layout_width="match_parent"
      android:layout_height="match_parent"/>
  </linearlayout>

</android.support.constraint.constraintlayout>

rvadapter.java

public class rvadapter extends recyclerview.adapter<rvadapter.viewholder>{

  private list<string> lists;
  private context mcontext;

  public rvadapter(list<string> lists, context context) {
    this.lists = lists;
    mcontext = context;
  }

  @override
  public viewholder oncreateviewholder(viewgroup parent, int viewtype) {
    view view = view.inflate(mcontext, r.layout.item, null);
    viewholder holder = new viewholder(view);
    return holder;
  }

  public void adddata(int position) {
    lists.add(position,"ff");
    notifyiteminserted(position);
  }

  public void remove(int i) {
    lists.remove(i);
    notifyitemremoved(i);
    notifydatasetchanged();

  }

  public interface onitemclicklistener{  //自定义接口回调设置点击事件
    void onitemclick(int position);
    void onitemlongclick(int position);
  }

  private onitemclicklistener monitemclicklistener;

  public void setonitemclicklistener(onitemclicklistener onitemclicklistener){
    monitemclicklistener=onitemclicklistener;
  }

  @override
  public void onbindviewholder(final viewholder holder, final int position) {
    holder.mtextview.settext(lists.get(position));

       holder.itemview.setonclicklistener(new view.onclicklistener() {
         @override
         public void onclick(view view) {

           int ps = holder.getlayoutposition();
           monitemclicklistener.onitemclick(ps);
         }
       });

       holder.itemview.setonlongclicklistener(new view.onlongclicklistener() {
         @override
         public boolean onlongclick(view view) {

           int ps=holder.getlayoutposition();
           monitemclicklistener.onitemlongclick(ps);
           return false;
         }
       });

  }


  @override
  public int getitemcount() {
    return lists.size();
  }

  public static class viewholder extends recyclerview.viewholder{
    public final textview mtextview;

    public viewholder(view itemview) {
      super(itemview);
      mtextview = (textview) itemview.findviewbyid(r.id.tv);
    }
  }
}

build.gradle

implementation 'com.android.support:recyclerview-v7:27.1.1'

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。

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