Android MVVM架构实现RecyclerView列表详解流程

效果图

导入引用

导入recyclerview依赖

 implementation 'androidx.recyclerview:recyclerview:1.1.0'

导入databinding引用

 databinding {
            enabled = true
        }

代码解析

建立实体类

继承被观察者模式baseobservable

@bindable绑定字段

刷新数据 notifypropertychanged( br.mname );//br自动生成

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 );
    }
}

将视图层与数据层绑定

@{information.mname}

建立recyclerview子项

导入实体类

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

<layout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://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="名字"
            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>

适配器

建立适配器

引入数据源

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

插入布局文件

 @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 );
    }

设置数据

 @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();
    }

自定义viewholder类

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;
        }

设置子项点击事件

定义接口

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

继承view.onclicklistener点击事件

class viewholder extends recyclerview.viewholder implements view.onclicklistener

获取接口实例

public viewholder(@nonnull viewdatabinding binding,onitemclicklistener listener)

调用接口

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

开放接口

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

adapter全部代码

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() );
            }
        }
    }
}

建立vm层

子项点击事件的使用

实现onitemclicklistener接口

@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();
            }
        } );
    }

vm层代码

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();
            }
        } );
    }
}

数据与视图交互

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) );
    }
}

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