我从一个普通的用户定义对象数组创建了一个JSON数组。如何将JSONArray转换回一个普通的用户定义类型的数组..? 我在Android中使用Json进行共享首选项。使用我在网上找到的以下代码:
import org.json.JSONObject;
import org.json.JSONArray;
import org.json.JSONException;
import android.content.Context;
import android.content.SharedPreferences;
public class JSONSharedPreferences {
private static final String PREFIX = "json";
public static void saveJSONObject(Context c, String prefName, String key, JSONObject object) {
SharedPreferences settings = c.getSharedPreferences(prefName, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString(JSONSharedPreferences.PREFIX+key, object.toString());
editor.commit();
}
public static void saveJSONArray(Context c, String prefName, String key, JSONArray array) {
SharedPreferences settings = c.getSharedPreferences(prefName, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString(JSONSharedPreferences.PREFIX+key, array.toString());
editor.commit();
}
public static JSONObject loadJSONObject(Context c, String prefName, String key) throws JSONException {
SharedPreferences settings = c.getSharedPreferences(prefName, 0);
return new JSONObject(settings.getString(JSONSharedPreferences.PREFIX+key, "{}"));
}
public static JSONArray loadJSONArray(Context c, String prefName, String key) throws JSONException {
SharedPreferences settings = c.getSharedPreferences(prefName, 0);
return new JSONArray(settings.getString(JSONSharedPreferences.PREFIX+key, "[]"));
}
public static void remove(Context c, String prefName, String key) {
SharedPreferences settings = c.getSharedPreferences(prefName, 0);
if (settings.contains(JSONSharedPreferences.PREFIX+key)) {
SharedPreferences.Editor editor = settings.edit();
editor.remove(JSONSharedPreferences.PREFIX+key);
editor.commit();
}
}
}
我在尝试将一个用户定义的对象数组转换为JsonArray并将其存储在JsonSharedPreference中,然后尝试检索它。但是不知道如何检索它。谢谢。