Android实现MVVM架构数据刷新详解流程

目录

• 效果图
• 示例结构图
• 代码解析
• 导入dataBinding
• 实体类
• xml视图
• VM
• 绑定视图与数据层

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

根据设置@BindingAdapter( “tmpImage” )设置里的内容，设置属性

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

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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