我想将一个对象传递给一个包。现在我用 GSON 做了一个 Json 对象的转换。
包已通过,包具有正确的字符串表示形式,但是当我从字符串创建对象时,出现了一个巨大的错误。
FATAL EXCEPTION: main
java.lang.RuntimeException: Failed to invoke private android.net.Uri() with no args
at com.google.gson.internal.ConstructorConstructor$3.construct(ConstructorConstructor.java:107)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:162)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.Gson.fromJson(Gson.java:803)
at com.google.gson.Gson.fromJson(Gson.java:768)
at com.google.gson.Gson.fromJson(Gson.java:717)
at com.google.gson.Gson.fromJson(Gson.java:689)
at com.test.fragment.QFragment.onCreateView(QFragment.java:54)
at android.app.Fragment.performCreateView(Fragment.java:1788)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:899)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1101)
at android.app.BackStackRecord.run(BackStackRecord.java:688)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1559)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:445)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5789)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:843)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.InstantiationException: can't instantiate class android.net.Uri
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
at com.google.gson.internal.ConstructorConstructor$3.construct(ConstructorConstructor.java:104)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:162)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.Gson.fromJson(Gson.java:803)
at com.google.gson.Gson.fromJson(Gson.java:768)
at com.google.gson.Gson.fromJson(Gson.java:717)
at com.google.gson.Gson.fromJson(Gson.java:689)
at com.test.fragment.QFragment.onCreateView(QFragment.java:54)
at android.app.Fragment.performCreateView(Fragment.java:1788)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:899)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1101)
at android.app.BackStackRecord.run(BackStackRecord.java:688)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1559)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:445)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5789)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:843)
at dalvik.system.NativeStart.main(Native Method)
我正在做这样的转换:
public static QFragment newInstance(FModel oModel) {
QFragment fragment = new QFragment();
fragment.mOModel = oModel;
Bundle bdl = new Bundle();
bdl.putString("oModel", new Gson().toJson(oModel));
fragment.setArguments(bdl);
return fragment;
}
在我的 createView fragment 中:
String jsonMyObject = null;
Bundle args = this.getArguments();
if (args != null) {
jsonMyObject = args.getString("oModel");
}
mOrderModel = new Gson().fromJson(jsonMyObject, FModel.class);
解决此问题的最佳方法是什么?我是否需要更改为可序列化或可打包?
最佳答案
发现问题在FModel里面确实有一个Uri。
通过编写解决了这个问题:
public class UriSerializer implements JsonSerializer<Uri> {
public JsonElement serialize(Uri src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive(src.toString());
}
}
public class UriDeserializer implements JsonDeserializer<Uri> {
@Override
public Uri deserialize(final JsonElement src, final Type srcType,
final JsonDeserializationContext context) throws JsonParseException {
return Uri.parse(src.getAsString());
}
}
并像这样进行 Gson 转换:
Gson gson = new GsonBuilder()
.registerTypeAdapter(Uri.class, new UriSerializer())
.create();
bdl.putString("oModel",gson.toJson(oModel));
并在 oncreate 中重建它:
Gson gson = new GsonBuilder()
.registerTypeAdapter(Uri.class, new UriDeserializer())
.create();
jsonMyObject = args.getString("oModel");
mOrderModel = gson.fromJson(jsonMyObject, FModel.class);
关于android - 从 Gson 字符串创建对象不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22533432/