自定义对象的Android的ArrayList - 保存到共享preferences - 序列化? [英] Android ArrayList of custom objects - Save to SharedPreferences - Serializable?
问题描述
我有一个对象的ArrayList。该对象包含类型位图和字符串',然后就getter和setter两者。首先是位图可序列化的?
我怎么会去这个序列,将其存储在共享preferences?我见过很多人问过类似的问题,但没有一个似乎给了一个很好的答案。我想preFER一些code的例子,如果在所有可能的。
如果位图不是序列化的话我怎么去有关存储此ArrayList <?/ P>
非常感谢。
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&LT;列表&LT;学生&GT;&GT;(){}的getType()。
名单&LT;学生&GT;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);
这篇关于自定义对象的Android的ArrayList - 保存到共享preferences - 序列化?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!