Given the following .json file:
[
{
"name" : "New York",
"number" : "732921",
"center" : [
"latitude" : 38.895111,
"longitude" : -77.036667
]
},
{
"name" : "San Francisco",
"number" : "298732",
"center" : [
"latitude" : 37.783333,
"longitude" : -122.416667
]
}
]
I prepared two classes to represent the contained data:
public class Location {
public String name;
public int number;
public GeoPoint center;
}
...
public class GeoPoint {
public double latitude;
public double longitude;
}
In order to parse the content from the .json file I use Jackson 2.2.x and prepared the following method:
public static List<Location> getLocations(InputStream inputStream) {
ObjectMapper objectMapper = new ObjectMapper();
try {
TypeFactory typeFactory = objectMapper.getTypeFactory();
CollectionType collectionType = typeFactory.constructCollectionType(
List.class, Location.class);
return objectMapper.readValue(inputStream, collectionType);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
プロパティを省略すれば、centerすべてのコンテンツを解析できます。ただし、地理座標を解析しようとすると、次のエラー メッセージが表示されます。
com.fasterxml.jackson.databind.JsonMappingException: [ソース: android.content.res.AssetManager$AssetInputStream@416a5850; 行: 5、列: 25] の START_ARRAY トークンから com.example.GeoPointのインスタンスをデシリアライズできません
(参照チェーン: com.example.Location["center"] 経由)