1.配置 build.gradle 开启databinding

dataBinding {
        enabled = true
    }

2.xml新增layout data variable然后build回主界面 LayoutActivityMainBinding activityMainBinding = DataBindingUtil.setContentView(this, R.layout.layout_activity_main);

<?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">
    <data>
        <variable
            name="user"
            type="com.lei.bindview.User"/>

        <variable
            name="progress"
            type="com.lei.bindview.Progress"/>
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text='@{user.name,default="name"}'/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text='@{user.age+@string/percent,default="age"}'/>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:imageUrl="@{user.picUrl}"/>

        <com.lei.bindview.LandleafView
            app:progress='@{progress}'
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:cBoundSize="3"
            app:cLevelText="舒适"
            app:cLevelTextSize="18"
            app:cLineWidth="12"
            app:cMaxText="30"
            app:cMinText="0"
            app:cProgressText="24"
            app:cProgressTextSize="75"
            app:cRadius="115"
            app:cRangeTextSize="15"
            app:cTriangleWidth="12"
            />
    </LinearLayout>
</layout>

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LayoutActivityMainBinding activityMainBinding = DataBindingUtil.setContentView(this, R.layout.layout_activity_main);
        User user = new User("zn", "25","http://www.landleafservice.cn:8080/pics/icon_cloudy.png");
        Progress progress = new Progress(20, 0, 36, Color.GREEN, "优");
        activityMainBinding.setUser(user);
        activityMainBinding.setProgress(progress);
    }

    @BindingAdapter("imageUrl")
    public static void bindImage(ImageView imageView, String url){
        Log.d("ImageLoadAdaptersss", url);
        Picasso.with(imageView.getContext()).load(url).into(imageView);
    }
}

坑1变量引入

<data>
        <import type="com.landleaf.httpplugin.bean.WeatherModel"/>
        <import type="com.landleaf.httpplugin.bean.Yinchaun"/>
        <variable
            name="weatherModel"
            type="WeatherModel" />

        <variable
            name="yinchuan"
            type="Yinchaun"/>
    </data>

坑2设置默认值&使用引用value属性

android:text='@{yinchuan.voc+@string/tv_unit_mg,default="暂无"}'

坑3图片绑定

    //绑定一个下载图片的方法：需要图片URL和ImageView来显示，让这个方法能直接调用，最简单的就先定义为static  可放在Activity中或者新开一个class丢进去，会自动调用，照格式写就行
    @BindingAdapter({"imageUrl"})
    public static void loadImage(ImageView view, String url) {
        Glide.with(view.getContext()).load(url).into(view);
    }
    app:imageUrl='@{weatherModel.picUrl}'

坑4绑定自定义控件

<com.lei.bindview.LandleafView
   app:progress="@{progress}"
public void setProgress(Progress pro) {}  单属性设置,此处为单参数

//多属性需要自定义
@BindingAdapter({"bind:imageUrl", "bind:error"})
public static void loadImage(ImageView view, String url, Drawable error) {
   Picasso.with(view.getContext()).load(url).error(error).into(view);
}
<ImageView 
    app:imageUrl=“@{venue.imageUrl}”
    app:error=“@{@drawable/venueError}”/>

坑5绑定点击事件

 <variable
            name="onClickListener"
            type="android.view.View.OnClickListener" />

        binding.setOnClickListener(this);
    @Override
    public void onClick(View v) {
        switch (v.getId()) {}
    }

留作纪念。。。