Question

我尝试使用 Gson 在 sharedPreferences 中存储地理位置列表。这是我到目前为止所做的事情

           ArrayListOfGeofence listOfGeofence = new ArrayListOfGeofence();

            listOfGeofence.setmGeofencesList(mGeofenceList);

            editor = goefenceIdsPreferences.edit();

            Gson gson = new Gson();

            String json = gson.toJson(listOfGeofence.mGeofencesList);

            Log.i(TAG, "Json Geofence Objects: " + json);

            editor.putString(fenceName, json).commit();

事情不应该是预期的。这就是我的日志显示的内容：

Json Geofence Objects: [{"Jo":"1","NU":3,"Oz":-1,"NX":12.93217,"NY":77.63186,"NZ":300.0,"Oa":0,"Ob":-1,"NW":1,"xH":1}]

我的实际地理围栏ArrayList是：

ArrayListOfGeofence: [Geofence[CIRCLE id:1 transitions:3 12.932490, 77.630830 300m, resp=0s, dwell=-1ms, @-1], Geofence[CIRCLE id:2 transitions:3 12.934540, 77.628650 300m, resp=0s, dwell=-1ms, @-1]]

这就是我为 ArrayListOfGeofence 类

撰写的内容

public class ArrayListOfGeofence implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = 1L;

List<Geofence> mGeofencesList = new ArrayList<Geofence>();


public List<Geofence> getmGeofencesList()
{
    return mGeofencesList;
}

public void setmGeofencesList(List<Geofence> mGeofencesList) 
{
    this.mGeofencesList = mGeofencesList;
}

}

但我无法取回我的Geofence Objects.所以它给了我一个错误：

GSON Generic: failed to deserialized json object

Answer 1

不要为此使用共享偏好。它不是为它而制造的，共享偏好的目的不是为了存储一切。你已经把它作为JSON，只需将json保存为文件

Answer 2

编辑该行： String json = gson.toJson（listOfGeofence.mGeofencesList）; 通过： String json = gson.toJson（listOfGeofence.getmGeofencesList（））;

如何存储自定义对象的ArrayList（Geofence）

2 个答案: