无法调用类的无参数构造函数。向 Gson 注册此类型的 InstanceCreator 可能会解决此问题

Question

java.lang.RuntimeException: Unable to invoke no-args constructor for class com.arch.example.network.models.NetworkPagingList. Registering an InstanceCreator with Gson for this type may fix this problem.\n                    at com.google.gson.internal.ConstructorConstructor$14.construct(ConstructorConstructor.java:228)\n                    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:212)\n                    at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:40)\n                    at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:27)\n                    at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:243)\n                    at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:153)\n                    at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519)\n                    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)\n                    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)\n                    at java.lang.Thread.run(Thread.java:1012)\n                 Caused by: java.lang.UnsupportedOperationException: Abstract class can't be instantiated! Class name: com.arch.example.network.models.NetworkPagingList\n                    at com.google.gson.internal.UnsafeAllocator.assertInstantiable(UnsafeAllocator.java:120)\n                    at com.google.gson.internal.UnsafeAllocator$1.newInstance(UnsafeAllocator.java:49)\n                    at com.google.gson.internal.ConstructorConstructor$14.construct(ConstructorConstructor.java:225)\n                    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:212)\xc2\xa0\n                    at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:40)\xc2\xa0\n                    at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:27)\xc2\xa0\n                    at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:243)\xc2\xa0\n                    at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:153)\xc2\xa0\n                    at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519)\xc2\xa0\n                    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)\xc2\xa0\n                    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)\xc2\xa0\n                    at java.lang.Thread.run(Thread.java:1012)\xc2\xa0\n

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实体：

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import com.google.gson.annotations.SerializedName\n\ndata class NetworkPagingList<T>(\n    @SerializedName("data")\n    val data: List<T>\n)\n

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使用地点：

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    @GET("worker/shifts")\n    suspend fun getShifts(\n        @Query("page") page: Int,\n        @Query("perPage") perPage: Int\n    ): NetworkPagingList<NetworkShift>\n

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那么这里到底出了什么问题呢？

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以前工作正常，但似乎最新的 Android gradle 插件停止与发布版本一起工作，R8 的一些 mb

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Answer 1

尝试添加@Keep您的数据类，如下所示：

import com.google.gson.annotations.SerializedName

@Keep
data class NetworkPagingList<T>(
    @SerializedName("data")
    val data: List<T>
)