gson.toJson() 在 android 8 及更低版本的设备中不起作用

Question

当应用程序启动时，它会给出以下致命异常

2020-09-28 17:56:22.145 5895-5895/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.nagra.uk.jado, PID: 5895
    java.lang.RuntimeException: Unable to resume activity {com.nagra.uk.jado/com.nagra.uk.jado.MainActivity}: java.lang.IllegalArgumentException: class android.content.res.ColorStateList declares multiple JSON fields named mChangingConfigurations
        at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3581)
        at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3621)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2862)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
     Caused by: java.lang.IllegalArgumentException: class android.content.res.ColorStateList declares multiple JSON fields named mChangingConfigurations
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:172)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
        at com.google.gson.Gson.getAdapter(Gson.java:458)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:117)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:166)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
        at com.google.gson.Gson.getAdapter(Gson.java:458)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:117)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:166)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
        at com.google.gson.Gson.getAdapter(Gson.java:458)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:56)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245)
        at com.google.gson.internal.bind.ObjectTypeAdapter.write(ObjectTypeAdapter.java:107)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:97)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:61)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69)
        at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.write(MapTypeAdapterFactory.java:208)
        at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.write(MapTypeAdapterFactory.java:145)
        at com.google.gson.Gson.toJson(Gson.java:704)
        at com.google.gson.Gson.toJson(Gson.java:683)
        at com.google.gson.Gson.toJson(Gson.java:638)
        at com.google.gson.Gson.toJson(Gson.java:618)
        at com.nagra.uk.jado.MainActivity.sendUpdatedData(MainActivity.java:410)
        at com.nagra.uk.jado.MainActivity.onResume(MainActivity.java:392)
        at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1355)
        at android.app.Activity.performResume(Activity.java:7117)
        at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3556)
        at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3621) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2862) 
        at android.app.ActivityThread.-wrap11(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6494) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 

 任何人都可以提供相同的帮助吗.. 相同的代码适用于 Android 9 和其他设备

Answer 1

您似乎正在尝试序列化 ColorStateList。序列化您无法控制的类是有风险的，但在这种情况下它不起作用，因为它有一个名为mChangingConfigurations 的字段，而抽象基类ComplexColor 也有一个名为mChangingConfigurations 的字段。 GSON 无法处理序列化具有相同名称的两个不同字段，因此它会失败。

在不了解您的具体用例的情况下，我的一般建议是避免序列化您无法控制的类。如果您需要能够从序列化数据重新创建它们，那么您可以序列化构造它们所需的特定数据（例如，特定颜色 int(s) 和 state(s)）。