Android 在 SharedPreferences 中存储数组列表对象
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Storing Array List Object in SharedPreferences
提问by usrNotFound
This method add new object into ArrayList
此方法将新对象添加到 ArrayList
//get text from textview
time = date.getText().toString();
entry_d = entry.getText().toString();
dayName = day.getText().toString();
arrayList.add( new ArrayObject( dayName, entry_d ,time));
I am trying to add these 3 strings in SharedPrefrences. Here is my code:
我正在尝试将这 3 个字符串添加到SharedPrefrences. 这是我的代码：
private void savePreferences(String key, String value) {
SharedPreferences sharedPreferences = PreferenceManager
.getDefaultSharedPreferences(this);
Editor editor = sharedPreferences.edit();
editor.putBoolean(key, value);
editor.commit();
}
This method only add one string at a time where as I want to add 3 strings in one go. Is there any method I can implement.
这种方法一次只添加一个字符串，因为我想一次添加 3 个字符串。有什么方法可以实现。
回答by Sinan Kozak
Convert your array or object to Json with Gson library and store your data as String in json format.
使用 Gson 库将您的数组或对象转换为 Json，并将您的数据存储为 json 格式的字符串。
Save;
节省;
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
Editor editor = sharedPrefs.edit();
Gson gson = new Gson();
String json = gson.toJson(arrayList);
editor.putString(TAG, json);
editor.commit();
Read;
读;
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
Gson gson = new Gson();
String json = sharedPrefs.getString(TAG, "");
Type type = new TypeToken<List<ArrayObject>>() {}.getType();
List<ArrayObject> arrayList = gson.fromJson(json, type);
回答by Hari krishna Andhra Pradesh
Store Arraylist Using Shared Preferences
使用共享首选项存储 Arraylist
SharedPreferences prefs=this.getSharedPreferences("yourPrefsKey",Context.MODE_PRIVATE);
Editor edit=prefs.edit();
Set<String> set = new HashSet<String>();
set.addAll(your Arraylist Name);
edit.putStringSet("yourKey", set);
edit.commit();
Retrieve Arraylist from Shared Preferences
从共享首选项中检索 Arraylist
Set<String> set = prefs.getStringSet("yourKey", null);
List<String> sample=new ArrayList<String>(set);
回答by usrNotFound
Don't use Hashsetfor this. It will change the ordering of Arraylist. Use Gsoninstead.
If you wish to use Hashset, you will have to serialize and deserialize which will take up resources.
不要Hashset用于此。它将改变 的顺序Arraylist。使用Gson来代替。如果您想使用Hashset，则必须进行序列化和反序列化，这将占用资源。
