Я относительно новичок в разработке Java и Android, поэтому извините, если это глупый вопрос. Я создаю простое приложение, просто для изучения веревок Android, которое будет отображать список самых последних фотографий, загруженных на Flickr. Приложение создано, но оно перестает работать, когда оно пытается десериализовать json, который я получил от flickr. Вот моя ошибка:
06-23 21:11:25.560: WARN/System.err(298): com.google.gson.JsonParseException: The JsonDeserializer com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter@43e28168 failed to deserialized json object {"page":1,"pages":100,"perpage":10,"total":1000,"photo":[{"id":"4728507833","owner":"59492791@N00","secret":"496b96968d","server":"1407","farm":2,"title":"DSCN2733","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1407/4728507833_496b96968d_s.jpg","height_sq":75,"width_sq":75},{"id":"4728507883","owner":"30728507@N07","secret":"ab80a5bdf4","server":"1194","farm":2,"title":"Sultan","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1194/4728507883_ab80a5bdf4_s.jpg","height_sq":75,"width_sq":75},{"id":"4728507955","owner":"30311414@N00","secret":"7d6ea1cd08","server":"1377","farm":2,"title":"DSC04455","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1377/4728507955_7d6ea1cd08_s.jpg","height_sq":75,"width_sq":75},{"id":"4728507979","owner":"24737003@N04","secret":"c76cfe4afb","server":"1162","farm":2,"title":"IMGP1429","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1162/4728507979_c76cfe4afb_s.jpg","height_sq":75,"width_sq":75},{"id":"4728508009","owner":"62084706@N00","secret":"76b858efe7","server":"1366","farm":2,"title":"DSC_2459.JPG","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1366/4728508009_76b858efe7_s.jpg","height_sq":75,"width_sq":75},{"id":"4729153856","owner":"50879555@N02","secret":"843d4f56ec","server":"1129","farm":2,"title":"IMG_1585","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1129/4729153856_843d4f56ec_s.jpg","height_sq":75,"width_sq":75},{"id":"4729153942","owner":"43941986@N08","secret":"f7ea2d3037","server":"1257","farm":2,"title":"IMG_1126","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1257/4729153942_f7ea2d3037_s.jpg","height_sq":75,"width_sq":75},{"id":"4729153952","owner":"50634775@N07","secret":"af6d937dcd","server":"1129","farm":2,"title":"069_69","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1129/4729153952_af6d937dcd_s.jpg","height_sq":75,"width_sq":75},{"id":"4729153962","owner":"34771042@N07","secret":"71f6c321eb","server":"1014","farm":2,"title":"Snapshot_010","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1014/4729153962_71f6c321eb_s.jpg","height_sq":75,"width_sq":75},{"id":"4729153964","owner":"14318596@N08","secret":"6ab627b565","server":"1364","farm":2,"title":"DSC_0679","ispublic":1,"isfriend":0,"isfamily":0,"url_sq":"http://farm2.static.flickr.com/1364/4729153964_6ab627b565_s.jpg","height_sq":75,"width_sq":75}]} given the type com.google.gson.ParameterizedTypeImpl@3dd03b7
06-23 21:11:25.580: WARN/System.err(298): at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:63)
06-23 21:11:25.580: WARN/System.err(298): at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:88)
06-23 21:11:25.600: WARN/System.err(298): at com.google.gson.JsonObjectDeserializationVisitor.visitFieldUsingCustomHandler(JsonObjectDeserializationVisitor.java:117)
06-23 21:11:25.600: WARN/System.err(298): at com.google.gson.ObjectNavigator.navigateClassFields(ObjectNavigator.java:150)
06-23 21:11:25.610: WARN/System.err(298): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:123)
...
06-23 21:11:25.851: WARN/System.err(298): Caused by: java.lang.IllegalStateException: This is not a JSON Array.
06-23 21:11:25.901: WARN/System.err(298): at com.google.gson.JsonElement.getAsJsonArray(JsonElement.java:100)
06-23 21:11:25.911: WARN/System.err(298): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:468)
06-23 21:11:25.921: WARN/System.err(298): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:435)
06-23 21:11:25.921: WARN/System.err(298): at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:50)
06-23 21:11:25.931: WARN/System.err(298): ... 26 more
Исходя из этого, я предполагаю, что в нем есть что-то, что не нравится GSON в отношении возвращаемого json, но я недостаточно знаю, как java преобразует объекты и другие типы переменных в течение всей операции.
Я не уверен, понадобится ли вам это, но вот часть кода из проекта:
String response = client.getResponse();
response = response.replace("jsonFlickrApi(", "");
response = response.substring(0,response.length()-2);
Gson gson = new Gson();
FlickrPhotos flickrphotos = new FlickrPhotos();
try {
flickrphotos = gson.fromJson(response, FlickrPhotos.class);
} catch(Exception e) {
e.printStackTrace();
}
Вот FlickrPhotos:
public class FlickrPhotos {
private String page, pages, perpage, total;
private List<FlickrPhoto> photos;
public List<FlickrPhoto> getPhotos() {
return photos;
}
// More getters
}
Вот FlickrPhoto:
public class FlickrPhoto {
private String id, owner, secret, server, title, width_sq, url_sq;
// getters
}
Есть идеи? Большое спасибо за ваше время и, возможно, за терпение ... (Если я подхватываю это!)