创建对象从GSON字符串不起作用 [英] Create object from Gson string doesn't work
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问题描述
我想一个对象传递给包。现在我做了转换与GSON JSON对象。
I want to pass an object to a bundle. Now I did the conversion to a Json object with GSON.
该包通过，包有正确的字符串重新presentation但是当我创建的字符串对象，我得到一个巨大的错误。
The bundle is passed, the bundle has the right string representation but when I create the object from the string I get a huge error.
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)
我做的转换是这样的：
I'm doing the conversion like this:
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的片段：
and in my fragment on the createView:
String jsonMyObject = null;
Bundle args = this.getArguments();
if (args != null) {
jsonMyObject = args.getString("oModel");
}
mOrderModel = new Gson().fromJson(jsonMyObject, FModel.class);
最新最好的方式来解决这一问题？我是否需要更改为序列化或parcelable？
Whats the best way to fix this? Do I need to change to serializable or parcelable?
推荐答案
发现于FModel确实有一个开放的问题。
Found the problem in the FModel there was indeed a Uri.
通过书面形式解决了这个：
Solved this by writing:
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());
}
}
和做GSON转换是这样的：
and doing the Gson conversion like this:
Gson gson = new GsonBuilder()
.registerTypeAdapter(Uri.class, new UriSerializer())
.create();
bdl.putString("oModel",gson.toJson(oModel));
和在OnCreate重建这样的：
and in the oncreate to rebuild this:
Gson gson = new GsonBuilder()
.registerTypeAdapter(Uri.class, new UriDeserializer())
.create();
jsonMyObject = args.getString("oModel");
mOrderModel = gson.fromJson(jsonMyObject, FModel.class);
这篇关于创建对象从GSON字符串不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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