Android实现MVVM架构数据刷新详解流程

效果图

示例结构图

代码解析

导入databinding

 databinding{
            enabled = true
        }

实体类

继承baseobservable

public class sensor extends baseobservable

为字段添加@bindable

 @bindable
    public string gettmpvalue() {
        return tmpvalue;
    }

显示图片

图片添加@bindingadapter

@bindingadapter( "tmpimage" )

示例采用本地图片，没有采用网络图片

@bindingadapter( "tmpimage" )
    public static void settmpimage(imageview view, int tmpimage) {
        view.setimagedrawable( view.getcontext().getresources().getdrawable( tmpimage ) );
    }

为图片路径绑定字段

@bindable
    public int gettmpimage() {
        return tmpimage;
    }

绑定实体类

<layout
    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">

    <data>
        <variable
            name="viewmodel"
            type="com.franzliszt.refreshdata.viewmodel.viewmodel" />
    </data>
    <layout/>

根据设置@bindingadapter( “tmpimage” )设置里的内容，设置属性

<imageview
    android:layout_width="0dp"
    android:layout_weight="1"
    android:layout_height="50dp"
    tmpimage="@{viewmodel.sensor.tmpimage}"
    android:scaletype="fitcenter"/>

实体类全部代码

public class sensor extends baseobservable {
    private string tmpvalue;
    private string humvalue;
    private string lightvalue;
    private string humanvalue;
    private string smokevalue;
    private string firevalue;
    private int tmpimage;
    private int humimage;
    private int lightimage;
    private int humanimage;
    private int smokeimage;
    private int fireimage;
    public sensor(){

    }
    public sensor(int tmpimage,int humimage,int lightimage,int humanimage,int smokeimage,int fireimage){
        this.tmpimage = tmpimage;
        this.humimage = humimage;
        this.lightimage = lightimage;
        this.humanimage = humanimage;
        this.smokeimage = smokeimage;
        this.fireimage = fireimage;
    }
    @bindable
    public string gettmpvalue() {
        return tmpvalue;
    }

    public void settmpvalue(string tmpvalue) {
        this.tmpvalue = tmpvalue;
        notifypropertychanged( br.tmpvalue );
    }
    @bindable
    public string gethumvalue() {
        return humvalue;
    }

    public void sethumvalue(string humvalue) {
        this.humvalue = humvalue;
        notifypropertychanged( br.humvalue );
    }
    @bindable
    public string getlightvalue() {
        return lightvalue;
    }

    public void setlightvalue(string lightvalue) {
        this.lightvalue = lightvalue;
        notifypropertychanged( br.lightvalue );
    }
    @bindable
    public string gethumanvalue() {
        return humanvalue;
    }

    public void sethumanvalue(string humanvalue) {
        this.humanvalue = humanvalue;
        notifypropertychanged( br.humanvalue );
    }
    @bindable
    public string getsmokevalue() {
        return smokevalue;
    }

    public void setsmokevalue(string smokevalue) {
        this.smokevalue = smokevalue;
        notifypropertychanged( br.smokevalue );
    }
    @bindable
    public string getfirevalue() {
        return firevalue;
    }

    public void setfirevalue(string firevalue) {
        this.firevalue = firevalue;
        notifypropertychanged( br.firevalue );
    }
    @bindable
    public int gettmpimage() {
        return tmpimage;
    }
    @bindingadapter( "tmpimage" )
    public static void settmpimage(imageview view, int tmpimage) {
        view.setimagedrawable( view.getcontext().getresources().getdrawable( tmpimage ) );
    }
    @bindable
    public int getlightimage() {
        return lightimage;
    }
    @bindingadapter( "lightimage" )
    public static void setlightimage(imageview view,int lightimage) {
        view.setimagedrawable( view.getcontext().getresources().getdrawable( lightimage ) );
    }
    @bindable
    public int gethumanimage() {
        return humanimage;
    }
    @bindingadapter( "humanimage" )
    public static void sethumanimage(imageview view,int humanimage) {
        view.setimagedrawable( view.getcontext().getresources().getdrawable( humanimage ) );
    }
    @bindable
    public int getsmokeimage() {
        return smokeimage;
    }
    @bindingadapter( "smokeimage" )
    public static void setsmokeimage(imageview view,int smokeimage) {
        view.setimagedrawable( view.getcontext().getresources().getdrawable( smokeimage ) );
    }
    @bindable
    public int getfireimage() {
        return fireimage;
    }
    @bindingadapter( "fireimage" )
    public static void setfireimage(imageview view,int fireimage) {
        view.setimagedrawable( view.getcontext().getresources().getdrawable( fireimage ) );
    }
    @bindable
    public int gethumimage() {
        return humimage;
    }
    @bindingadapter( "humimage" )
    public static void sethumimage(imageview view,int humimage) {
        view.setimagedrawable( view.getcontext().getresources().getdrawable( humimage ) );
    }
}

xml视图

<?xml version="1.0" encoding="utf-8"?>
<layout
    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">

    <data>
        <variable
            name="viewmodel"
            type="com.franzliszt.refreshdata.viewmodel.viewmodel" />
    </data>
<linearlayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".view.mainactivity"
    android:layout_margin="30dp">

<linearlayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:background="@drawable/item_bg_style"
    android:layout_margintop="20dp"
    android:paddingtop="10dp">
<imageview
    android:layout_width="0dp"
    android:layout_weight="1"
    android:layout_height="50dp"
    tmpimage="@{viewmodel.sensor.tmpimage}"
    android:scaletype="fitcenter"/>
   <textview
       android:layout_width="0dp"
       android:layout_weight="1"
       android:layout_height="50dp"
       android:text="温度值:"
       android:textcolor="#ffffff"
       android:textsize="20sp"
       android:gravity="center"/>
    <textview
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="50dp"
        android:text="@{viewmodel.sensor.tmpvalue}"
        android:textcolor="#ffffff"
        android:textsize="25sp"
        android:gravity="center"/>
</linearlayout>
        <linearlayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:background="@drawable/item_bg_style"
            android:layout_margintop="20dp"
            android:paddingtop="10dp">
            <imageview
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="50dp"
                humimage="@{viewmodel.sensor.humimage}"
                android:scaletype="fitcenter"/>
            <textview
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="50dp"
                android:text="湿度值:"
                android:textcolor="#ffffff"
                android:textsize="20sp"
                android:gravity="center"/>
            <textview
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="50dp"
                android:text="@{viewmodel.sensor.humvalue}"
                android:textcolor="#ffffff"
                android:textsize="25sp"
                android:gravity="center"/>
        </linearlayout>
    <linearlayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@drawable/item_bg_style"
        android:layout_margintop="20dp"
        android:paddingtop="10dp">
        <imageview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            lightimage="@{viewmodel.sensor.lightimage}"
            android:scaletype="fitcenter"/>
        <textview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            android:text="光照值:"
            android:textcolor="#ffffff"
            android:textsize="20sp"
            android:gravity="center"/>
        <textview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            android:text="@{viewmodel.sensor.lightvalue}"
            android:textcolor="#ffffff"
            android:textsize="25sp"
            android:gravity="center"/>
    </linearlayout>
    <linearlayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@drawable/item_bg_style"
        android:layout_margintop="20dp"
        android:paddingtop="10dp">
        <imageview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            smokeimage="@{viewmodel.sensor.smokeimage}"
            android:scaletype="fitcenter"/>
        <textview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            android:text="烟雾值:"
            android:textcolor="#ffffff"
            android:textsize="20sp"
            android:gravity="center"/>
        <textview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            android:text="@{viewmodel.sensor.smokevalue}"
            android:textcolor="#ffffff"
            android:textsize="25sp"
            android:gravity="center"/>
    </linearlayout>
    <linearlayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@drawable/item_bg_style"
        android:layout_margintop="20dp"
        android:paddingtop="10dp">
        <imageview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            fireimage="@{viewmodel.sensor.fireimage}"
            android:scaletype="fitcenter"/>
        <textview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            android:text="火焰值:"
            android:textcolor="#ffffff"
            android:textsize="20sp"
            android:gravity="center"/>
        <textview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            android:text="@{viewmodel.sensor.firevalue}"
            android:textcolor="#ffffff"
            android:textsize="25sp"
            android:gravity="center"/>
    </linearlayout>
    <linearlayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@drawable/item_bg_style"
        android:layout_margintop="20dp"
        android:paddingtop="10dp">
        <imageview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            humanimage="@{viewmodel.sensor.humanimage}"
            android:scaletype="fitcenter"/>
        <textview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            android:text="人体红外:"
            android:textcolor="#ffffff"
            android:textsize="20sp"
            android:gravity="center"/>
        <textview
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            android:text="@{viewmodel.sensor.humanvalue}"
            android:textcolor="#ffffff"
            android:textsize="25sp"
            android:gravity="center"/>
    </linearlayout>
    </linearlayout>
</layout>

vm

接收数据

调用handle类的接口，接收传感器数据(随机数据)

  private void initdata(){
       handle.sethandledta( new handle.handledata() {
           @override
           public void getsensorvalue(int[] value) {
                 new thread( ()->{
                  while (true){
                      try {
                          thread.sleep( 5000 );
                      } catch (interruptedexception e) {
                          e.printstacktrace();
                      }
                      sensor.settmpvalue( value[0]+"℃");
                      sensor.sethumvalue( value[1]+"rh" );
                      sensor.setlightvalue( value[2]+"lux" );
                      sensor.setsmokevalue( value[3]+"%" );
                      sensor.setfirevalue( value[4]+"%" );
                      sensor.sethumanvalue( value[5] == 1 ? "有人" : "无人" );
                  }
              } ).start();
          }
      });
  }

发送数据

建立接口，回调数据

  public interface handledata{
        void getsensorvalue(int[] value);
    }
    public void sethandledta(handledata handledta){
        int[] value = returndata();
        handledta.getsensorvalue(value);
    }

制造数据

private void refreshsensorvalue(){
          thread = new thread( ()->{
            while (true){
                try {
                    thread.sleep( 2000 );
                } catch (interruptedexception e) {
                    e.printstacktrace();
                }
                /*温度*/
                value[0] = randomrange(35,30);
                /*湿度*/
                value[1] = randomrange(80,75);
                /*光照值*/
                value[2] = randomrange(120,100);
                /*烟雾*/
                value[3] = randomrange(60,50);
                /*火焰*/
                value[4] = randomrange(30,25);
                /*红外*/
                value[5] = randomrange(2,0);
                log.d( "tag",value[5]+"" );
            }
        } );
        thread.start();
    }

绑定视图与数据层

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() );
    }
}

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