存储ArrayList中去共享preference对象

存储ArrayList中去共享preference对象

本文介绍了存储ArrayList中去共享preference对象的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有对象的ArrayList。
每次我preSS一个按钮,我创建一个对象,并将其放置在ArrayList中。
我需要保存这个数组列表,当我退出该应用程序。当我来到又一次preSS的按钮,应该添加一个新的对象来保存到共享preference现有数组列表,

我不能够存储和接收数组列表。我用GSON但​​我不是很清楚它是如何工作的。

code段:

 公共静态的ArrayList<书签及GT; bkmarkList =新的ArrayList();
静态共享preferences键值=
    preferenceManager.getDefaultShared preferences(activity.getApplicationContext());
静态编辑器编辑= keyvalues​​.edit();
    最终按钮bkmarkButton =(按钮)view.findViewById(R.id.mark_button);
            bkmarkButton.setOnClickListener(新OnClickListener()
            {                @覆盖
                公共无效的onClick(查看为arg0){
                    // TODO自动生成方法存根
                    bkmarkButton.setBackgroundResource(R.drawable.bookmarked);
                    bkmarkButton.setEnabled(假);
                    bkmarkButton.invalidate();
                    字符串WSS = data.mWss;
                    字符串GUID = data.mGuid;
                    字符串title = data.mTitle;
                    //共享preferences键值= activity.getShared preferences(bookmark_list,Context.MODE_PRIVATE);
                    // bkmarkList =(ArrayList的<书签及GT;)ObjectSerializer.deserialize(keyvalues​​.getString(bookmark_list,ObjectSerializer.serialize(新的ArrayList<书签及GT;())));
                    //editor.getStringSet()
                    GSON GSON =新GSON();
                    editor.putString(bookmark_list,新GSON()的toJSON(bkmarkList)的ToString());
                    如果(keyvalues​​.getString(bookmark_list,)!= NULL);
                    {
                        ArrayList的<书签及GT; bkMark =新的ArrayList<书签及GT;();
                        // bkMark = gson.fromJson(bookmark_list的ArrayList<书签及GT;);
                        //字符串值= keyvalues​​.getString(bookmark_list,);
                        //keyvalues​​.getStringSet(gson.fromJson(bkmarkList))
                        // bkmarkList = gson.fromJson(价值,);
                    }
                    bkmarkList.add(新的书签(WSS,GUID,标题));                }
            });


解决方案

GSON是非常容易使用,请看这里:
<一href=\"http://stackoverflow.com/questions/7145606/how-android-shared$p$pferences-save-store-object\">How Android的共享preferences保存/存储对象

共享preferences米preFS = GET preferences(MODE_PRIVATE);
要保存

 编辑器prefsEditor = M prefs.edit();
     GSON GSON =新GSON();
     JSON字符串= gson.toJson(myObject的);
     prefsEditor.putString(MyObject来,JSON);
     prefsEditor.commit();

中检索

  GSON GSON =新GSON();
    JSON字符串= M prefs.getString(MyObject来,);
    为MyObject OBJ = gson.fromJson(JSON,MyObject.class);

I have an Arraylist of objects.Each time I press a button, I create an object and place it in the ArrayList.I need to save this array list when I exit the app. When I come and again press the button, it should add a new object to the existing array list saved to the Shared Preference,

I am not able to store and receive the array list. I used GSON but I am not very clear how it works.

Code Snippet:

    public static ArrayList <BookMark> bkmarkList = new ArrayList();
static SharedPreferences keyvalues =
    PreferenceManager.getDefaultSharedPreferences(activity.getApplicationContext());
static Editor editor = keyvalues.edit();
    final Button bkmarkButton = (Button) view.findViewById(R.id.mark_button);
            bkmarkButton.setOnClickListener(new OnClickListener()
            {

                @Override
                public void onClick(View arg0) {
                    // TODO Auto-generated method stub
                    bkmarkButton.setBackgroundResource(R.drawable.bookmarked);
                    bkmarkButton.setEnabled(false);
                    bkmarkButton.invalidate();
                    String wss = data.mWss;
                    String guid = data.mGuid;
                    String title = data.mTitle;
                    //SharedPreferences keyvalues = activity.getSharedPreferences("bookmark_list",  Context.MODE_PRIVATE);
                    //bkmarkList = (ArrayList<BookMark>) ObjectSerializer.deserialize(keyvalues.getString(bookmark_list, ObjectSerializer.serialize(new ArrayList<BookMark>())));
                    //editor.getStringSet()
                    Gson gson = new Gson();
                    editor.putString("bookmark_list", new Gson().toJson(bkmarkList).toString());
                    if(keyvalues.getString("bookmark_list","")!=null);
                    {
                        ArrayList<BookMark> bkMark = new ArrayList<BookMark>();
                        //bkMark = gson.fromJson("bookmark_list", ArrayList<BookMark>);
                        //String value = keyvalues.getString("bookmark_list","");
                        //keyvalues.getStringSet(gson.fromJson(bkmarkList))
                        //bkmarkList = gson.fromJson(value, "");
                    }
                    bkmarkList.add(new BookMark(wss,guid, title));

                }
            });
解决方案

GSON is very easy to use, look here:How Android SharedPreferences save/store object

SharedPreferences mPrefs = getPreferences(MODE_PRIVATE);To Save

  Editor prefsEditor = mPrefs.edit();
     Gson gson = new Gson();
     String json = gson.toJson(MyObject);
     prefsEditor.putString("MyObject", json);
     prefsEditor.commit();

To Retreive

  Gson gson = new Gson();
    String json = mPrefs.getString("MyObject", "");
    MyObject obj = gson.fromJson(json, MyObject.class);

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09-02 20:05