小编Mau*_*oja的帖子

我已经更新了一个 Android Studio 3.6，然后它向我显示了一个错误“未解析的引用：ActivityMainBinding”。但我想知道该项目仍然与以前的 android studio 版本一样工作。只是给了我一个错误“未解析的参考：ActivityMainBinding”。

您好，我目前正在准备一个带有协程的 MVVM 的简单演示示例，我面临以下问题。请查看代码以及代码有什么问题。

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.android.mvvmcoroutine.development, PID: 18974
    java.lang.RuntimeException: Failed to invoke public io.reactivex.Observable() with no args
        at com.google.gson.internal.ConstructorConstructor$3.construct(ConstructorConstructor.java:113)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:212)
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:39)
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:27)
        at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:225)
        at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:121)
        at okhttp3.RealCall$AsyncCall.run(RealCall.kt:138)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:919)
     Caused by: java.lang.InstantiationException: Can't instantiate abstract class io.reactivex.Observable
        at java.lang.reflect.Constructor.newInstance0(Native Method)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
        at com.google.gson.internal.ConstructorConstructor$3.construct(ConstructorConstructor.java:110)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:212) 
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:39) 
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:27) 
        at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:225) 
        at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:121) 
        at okhttp3.RealCall$AsyncCall.run(RealCall.kt:138) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:919)

依赖配置

'rxJavaVersion'           : 'io.reactivex.rxjava2:rxjava:2.1.15'
'rxAndroidVersion'        : 'io.reactivex.rxjava2:rxandroid:2.1.1' …