Android-无法解析符号 BaseObservable

我正在尝试在 android 中实现数据绑定示例并使用可绑定变量创建 POJO，但我收到此错误！请帮忙。我正在关注这个教程http://www.vogella.com/tutorials/AndroidDatabinding/article.html http://www.vogella.com/tutorials/AndroidDatabinding/article.html这是我的代码

import android.databinding.BaseObservable;
import android.databinding.Bindable;

public class TemperatureData extends BaseObservable {
    private String location;
    private String celsius;

    public TemperatureData(String location, String celsius) {
        this.location = location;
        this.celsius = celsius;
    }

    @Bindable
    public String getCelsius() {
        return celsius;
    }

    @Bindable
    public String getLocation() {
        return location;
    }

    public  void setLocation(String location){
        this.location = location;
        notifyPropertyChanged(BR.location);
    }

    public void setCelsius(String celsius) {
        this.celsius = celsius;
        notifyPropertyChanged(BR.celsius);
    }

}

您应该将这些代码行添加到您的应用程序级 gradle 文件中，如1.2节 http://www.vogella.com/tutorials/AndroidDatabinding/article.html#enable-data-binding-in-your-android-application

android {
    ....
    dataBinding {
        enabled = true
    }
}