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分享程序员开发的那些事...
且构网 - 分享程序员编程开发的那些事

自定义对象的Andr​​oid的ArrayList - 保存到共享preferences - 序列化?

更新时间:2022-12-11 10:21:19

是的,你可以保存你的组合对象共享preferences.Let说:

 学生mStudentObject =新的学生();
 共享preferences appShared preFS = preferenceManager
  .getDefaultShared preferences(this.getApplicationContext());
  编辑prefsEditor = appShared prefs.edit();
  GSON GSON =新GSON();
  JSON字符串= gson.toJson(mStudentObject);
  prefsEditor.putString(为MyObject,JSON);
  prefsEditor.commit();
 

,现在你可以retreive你的对象为:

 共享preferences appShared preFS = preferenceManager
      .getDefaultShared preferences(this.getApplicationContext());
      编辑prefsEditor = appShared prefs.edit();
      GSON GSON =新GSON();
 JSON字符串= appShared prefs.getString(为MyObject,);
  学生mStudentObject = gson.fromJson(JSON,Student.class);
 

有关更多信息,请点击这里

如果你想取回任何类型的任何对象,例如数组列表学生,然后使用:

 输入型=新TypeToken<列表<学生>>(){}的getType()。
名单<学生>学生= gson.fromJson(JSON,类型);
 

I have an ArrayList of an object. The object contains the types 'Bitmap' and 'String' and then just getters and setters for both. First of all is Bitmap serializable?

How would I go about serializing this to store it in SharedPreferences? I have seen many people ask a similar question but none seem to give a good answer. I would prefer some code examples if at all possible.

If bitmap is not serializable then how do I go about storing this ArrayList?

many thanks.

Yes,you can save your composite object in shared preferences.Let say:

 Student mStudentObject=new Student();
 SharedPreferences appSharedPrefs = PreferenceManager
  .getDefaultSharedPreferences(this.getApplicationContext());
  Editor prefsEditor = appSharedPrefs.edit();
  Gson gson = new Gson();
  String json = gson.toJson(mStudentObject);
  prefsEditor.putString("MyObject", json);
  prefsEditor.commit(); 

and now you can retreive your object as:

     SharedPreferences appSharedPrefs = PreferenceManager
      .getDefaultSharedPreferences(this.getApplicationContext());
      Editor prefsEditor = appSharedPrefs.edit();
      Gson gson = new Gson();
 String json = appSharedPrefs.getString("MyObject", "");
  Student mStudentObject = gson.fromJson(json, Student.class);

for more information,click here.

If you want to get back Array List of type any any object e.g. student, then use:

Type type = new TypeToken<List<Student>>(){}.getType();
List<Student> students= gson.fromJson(json, type);