Reputation: 1754
I have a List
of Non-Generic type which i want to store in SharedPreferences
. For this, I am using Gson to convert the List
to String and then storing it to SharedPreferences
like this :
Gson gson = new Gson();
Type fooType = new TypeToken<ArrayList<UserFeedMaster>>() {}.getType();
// feedTempList is the ArrayList of type UserFeedMaster class
String gsonFeeds = gson.toJson(feedTempList,fooType);
prefs.edit().putString("recent_feedlist", gsonFeeds).commit();
And later on I am trying to get back the values as ArrayList<UserFeedMaster>
in this way :
String gsonFeed = prefs.getString("recent_feedlist", null);
Gson gson = new Gson();
Type type = new TypeToken<ArrayList<UserFeedMaster>>(){}.getType();
List<UserFeedMaster> historyFeeds = gson.fromJson(gsonFeed,type);
For Serializing the data, it is working fine. But the problem here is when I am De-serializing it, I get error java.lang.IllegalArgumentException: invalid value for field
at line List<UserFeedMaster> historyFeeds = gson.fromJson(gsonFeed,type);
Error Log :
java.lang.IllegalArgumentException: invalid value for field
at java.lang.reflect.Field.setField(Native Method)
at java.lang.reflect.Field.set(Field.java:588)
at com.google.api.client.util.FieldInfo.setFieldValue(FieldInfo.java:245)
at com.google.api.client.util.FieldInfo.setValue(FieldInfo.java:206)
at com.google.api.client.util.GenericData.put(GenericData.java:103)
at com.google.api.client.util.GenericData.put(GenericData.java:47)
at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:189)
at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146)
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.Gson.fromJson(Gson.java:755)
at com.google.gson.Gson.fromJson(Gson.java:721)
at com.google.gson.Gson.fromJson(Gson.java:670)
at com.myapp.sample.RecentFeedsFragment.onActivityCreated(RecentFeedsFragment.java:178)`
UserFeedMaster.java
public class UserFeedMaster {
@Id
private String feedBlobKey;
private Date feedDateTime;
private int feedLikes;
private boolean feedIsPrivate;
private boolean userIsAnonymous;
private String feedTags;
private boolean isFeedDeleted;
private double latitude;
private double longitude;
public double getLatitude() {
return latitude;
}
public void setLatitude(double latitude) {
this.latitude = latitude;
}
public double getLongitude() {
return longitude;
}
public void setLongitude(double longitude) {
this.longitude = longitude;
}
public String getFeedBlobKey() {
return feedBlobKey;
}
public void setFeedBlobKey(String feedBlobKey) {
this.feedBlobKey = feedBlobKey;
}
public Date getFeedDateTime() {
return feedDateTime;
}
public void setFeedDateTime(Date feedDateTime) {
this.feedDateTime = feedDateTime;
}
public int getFeedLikes() {
return feedLikes;
}
public void setFeedLikes(int feedLikes) {
this.feedLikes = feedLikes;
}
public boolean isFeedIsPrivate() {
return feedIsPrivate;
}
public void setFeedIsPrivate(boolean feedIsPrivate) {
this.feedIsPrivate = feedIsPrivate;
}
public boolean isUserIsAnonymous() {
return userIsAnonymous;
}
public void setUserIsAnonymous(boolean userIsAnonymous) {
this.userIsAnonymous = userIsAnonymous;
}
public String getFeedTags() {
return feedTags;
}
public void setFeedTags(String feedTags) {
this.feedTags = feedTags;
}
public boolean isFeedDeleted() {
return isFeedDeleted;
}
public void setFeedDeleted(boolean isFeedDeleted) {
this.isFeedDeleted = isFeedDeleted;
}
}
JSON response :
[
{
"feedBlobKey": "AMIfv944GCtKglU0zOhVTq6F0dG9Aj1LxtIN5Qz0d3CuaRWO3MWIXd_1eCBxVJA_T6FNjx83hq-ORmnAoivTz2IxL120iQYtePBUPoTru6sxKj5iLZmkRxqaIodwEgknUQPvrkEG_37rlUIoycRHUwnPJlmc_6lmtN32tw9-b5NW60wP7u5AHZY",
"feedDateTime": {
"value": 1396953609433,
"tzShift": 0,
"dateOnly": false
},
"feedDeleted": false,
"feedIsPrivate": false,
"feedLikes": 0,
"kind": "userfeedmasterendpoint#resourcesItem"
},
{
"feedBlobKey": "AMIfv944GCtKglU0zOhVTq6F0dG9Aj1LxtIN5Qz0d3CuaRWO3MWIXd_1eCBxVJA_T6FNjx83hq-ORmnAoivTz2IxL120iQYtePBUPoTru6sxKj5iLZmkRxqaIodwEgknUQPvrkEG_37rlUIoycRHUwnPJlmc_6lmtN32tw9-b5NW60wP7u5AHZY",
"feedDateTime": {
"value": 1396953609433,
"tzShift": 0,
"dateOnly": false
},
"feedDeleted": false,
"feedIsPrivate": false,
"feedLikes": 0,
"kind": "userfeedmasterendpoint#resourcesItem"
}
]
I don't know what is going wrong. Please help me on why I am getting this error and how can I resolve it. Thanks in advance.
Upvotes: 3
Views: 4319
Reputation: 76918
Your JSON has this:
"feedDateTime": {
"value": 1396953609433,
"tzShift": 0,
"dateOnly": false
}
Your Java class has this:
private Date feedDateTime;
Which one of these is not like the other? That is what is producing the error.
GSON isn't going to magically convert that JSON into a Date
object. You either need to create a Java class (FeedDateTime
) that matches that JSON object or write a custom deserializer for your UserFeedMaster
class.
Upvotes: 2