android开发分享Android MVVM架构实现RecyclerView列表详解流程

目录

• 效果图
• 导入引用
• 导入recyclerview依赖
• 导入databinding引用
• 代码解析
• 建立实体类
• 建立recyclerview子项
• 适配器
• 建立适配器
• 设置子项点击事件
• adapter全部代码
• 建立vm层
• 子项点击事件的使用
• vm层代码
• 数据与视图交互

   implementation 'androidx.recyclerview:recyclerview:1.1.0'  

   databinding {              enabled = true          }  

  public class information extends baseobservable {      public string mname;      public string msex;      public string mage;      public list<information> informationlist;      public information(){        }      public information(string mname,string msex,string mage){          this.mname = mname;          this.msex = msex;          this.mage = mage;      }      @bindable      public string getmage() {          return mage;      }      @bindable      public string getmname() {          return mname;        }      @bindable      public string getmsex() {          return msex;      }      /**       * @param mname*/      public void setmname(string mname) {          this.mname = mname;          notifypropertychanged( br.mname );      }      @bindable      public list<information> getinformationlist() {          return informationlist;      }        /**       * @param msex */      public void setmsex(string msex) {          this.msex = msex;          notifypropertychanged( br.msex );      }     /**      * @param mage */      public void setmage(string mage) {          this.mage = mage;          notifypropertychanged( br.mage );      }      /**       * @param informationlist */      public void setinformationlist(list<information> informationlist) {          this.informationlist = informationlist;          notifypropertychanged( br.informationlist );      }  }  

   <data>          <variable              name="information"              type="com.franzliszt.mvvmrecyclerview.model.information" />      </data>  

  <layout      xmlns:android="https://schemas.android.com/apk/res/android"      xmlns:app="https://schemas.android.com/apk/res-auto">      <data>          <variable              name="information"              type="com.franzliszt.mvvmrecyclerview.model.information" />      </data>  <linearlayout      android:orientation="vertical"      android:layout_width="match_parent"      android:layout_height="wrap_content"      android:layout_marginleft="30dp"      android:layout_marginright="30dp"      android:background="#f5f5f5">      <linearlayout          android:layout_width="match_parent"          android:layout_height="50dp"          android:orientation="horizontal"          android:layout_margintop="20dp"          android:background="@drawable/item_bg_style"          android:gravity="center"          android:paddingleft="20dp">          <textview              android:layout_width="0dp"              android:layout_weight="1"              android:layout_height="wrap_content"              android:hint="免费精选名字大全"              android:text="@{information.mname}"/>          <textview              android:layout_width="0dp"              android:layout_weight="1"              android:layout_height="wrap_content"              android:hint="性别"              android:text="@{information.msex}"/>          <textview              android:layout_width="0dp"              android:layout_weight="1"              android:layout_height="wrap_content"              android:hint="年龄"              android:text="@{information.mage}"/>      </linearlayout>    </linearlayout>  </layout>  

  public myrecyclerview(list<information> informationlist){          this.informationlist = informationlist;      }  

   @nonnull      @override      public viewholder oncreateviewholder(@nonnull viewgroup parent, int viewtype) {          viewdatabinding binding = databindingutil.inflate( layoutinflater.from( parent.getcontext()) , r.layout.recyclerview_item,parent,false);          return new viewholder( binding,monitemclicklistener );      }  

   @override      public void onbindviewholder(@nonnull viewholder holder, int position) {          information information = informationlist.get( position );          holder.binding.setvariable( br.information,informationlist.get( position ));          holder.binding.executependingbindings();      }  

  class viewholder extends recyclerview.viewholder implements view.onclicklistener{          viewdatabinding binding = null;          onitemclicklistener listener;          public viewholder(@nonnull viewdatabinding binding,onitemclicklistener listener) {              super( binding.getroot() );              this.listener = listener;              this.binding = binding;              binding.getroot().setonclicklistener( this );          }          public viewdatabinding getbinding(){              return binding;          }  

  public interface onitemclicklistener {          void onitemclick(view view, int position);      }  

  class viewholder extends recyclerview.viewholder implements view.onclicklistener  

  public viewholder(@nonnull viewdatabinding binding,onitemclicklistener listener)  

   @override          public void onclick(view v) {              if (listener != null){                  listener.onitemclick( v,getposition() );              }          }  

  public void setonitemclicklistener(onitemclicklistener listener) {          this.monitemclicklistener = listener;      }  

  public class myrecyclerview extends recyclerview.adapter<myrecyclerview.viewholder>{      private list<information> informationlist;      private onitemclicklistener monitemclicklistener;      public myrecyclerview(list<information> informationlist){          this.informationlist = informationlist;      }        public interface onitemclicklistener {          void onitemclick(view view, int position);      }        public void setonitemclicklistener(onitemclicklistener listener) {          this.monitemclicklistener = listener;      }      @nonnull      @override      public viewholder oncreateviewholder(@nonnull viewgroup parent, int viewtype) {          viewdatabinding binding = databindingutil.inflate( layoutinflater.from( parent.getcontext()) , r.layout.recyclerview_item,parent,false);          return new viewholder( binding,monitemclicklistener );      }        @override      public void onbindviewholder(@nonnull viewholder holder, int position) {          information information = informationlist.get( position );          holder.binding.setvariable( br.information,informationlist.get( position ));          holder.binding.executependingbindings();      }        @override      public int getitemcount() {          return informationlist.size();      }          class viewholder extends recyclerview.viewholder implements view.onclicklistener{          viewdatabinding binding = null;          onitemclicklistener listener;          public viewholder(@nonnull viewdatabinding binding,onitemclicklistener listener) {              super( binding.getroot() );              this.listener = listener;              this.binding = binding;              binding.getroot().setonclicklistener( this );          }          public viewdatabinding getbinding(){              return binding;          }            @override          public void onclick(view v) {              if (listener != null){                  listener.onitemclick( v,getposition() );              }          }      }  }  

  @override      public void initlistener(){          adapter.setonitemclicklistener( new myrecyclerview.onitemclicklistener() {              @override              public void onitemclick(view view, int position) {                  toast.maketext( context,"位数："+position,toast.length_short ).show();              }          } );      }  

  public class viewmodel implements iviewmodel{      public information information;      public list<information> mlist = new arraylist<>(  );      private recyclerview recyclerview;      private context context;      private myrecyclerview adapter;      public viewmodel(information information, recyclerview recyclerview, context context){          this.information = information;          this.recyclerview = recyclerview;          this.context = context;          initrecyclerview();          initdata();          initlistener();      }      private void initrecyclerview(){          recyclerview.setlayoutmanager( new linearlayoutmanager( context ) );          adapter = new myrecyclerview( mlist );          recyclerview.setadapter( adapter );      }      @override      public void initdata() {          for (int i = 0; i < 10; i++) {              mlist.add( new information( "张三"+i,"男",i+"" ) );              log.d( "tag",mlist.get( i ).mname+"" );          }          information.setinformationlist( mlist );      }      @override      public void initlistener(){          adapter.setonitemclicklistener( new myrecyclerview.onitemclicklistener() {              @override              public void onitemclick(view view, int position) {                  toast.maketext( context,"位数："+position,toast.length_short ).show();              }          } );      }  }  

  public class mainactivity extends appcompatactivity {      private activitymainbinding binding;      @override      protected void oncreate(bundle savedinstancestate) {          super.oncreate( savedinstancestate );          binding = databindingutil.setcontentview( this,r.layout.activity_main );          binding.setviewmodel( new viewmodel(new information(  ),binding.myrecyclerview,mainactivity.this) );      }  }