Android实现MVVM架构数据刷新流程是什么

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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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