I have an ArrayList with custom objects. Each custom object contains a variety of strings and numbers. I need the array to stick around even if the user leaves the activity and then wants to come back at a later time, however I don't need the array available after the application has been closed completely. I save a lot of other objects this way by using the SharedPreferences but I can't figure out how to save my entire array this way. Is this possible? Maybe SharedPreferences isn't the way to go about this? Is there a simpler method?
当前回答
该方法用于存储/保存数组列表:-
public static void saveSharedPreferencesLogList(Context context, List<String> collageList) {
SharedPreferences mPrefs = context.getSharedPreferences("PhotoCollage", context.MODE_PRIVATE);
SharedPreferences.Editor prefsEditor = mPrefs.edit();
Gson gson = new Gson();
String json = gson.toJson(collageList);
prefsEditor.putString("myJson", json);
prefsEditor.commit();
}
该方法用于检索数组列表:-
public static List<String> loadSharedPreferencesLogList(Context context) {
List<String> savedCollage = new ArrayList<String>();
SharedPreferences mPrefs = context.getSharedPreferences("PhotoCollage", context.MODE_PRIVATE);
Gson gson = new Gson();
String json = mPrefs.getString("myJson", "");
if (json.isEmpty()) {
savedCollage = new ArrayList<String>();
} else {
Type type = new TypeToken<List<String>>() {
}.getType();
savedCollage = gson.fromJson(json, type);
}
return savedCollage;
}
其他回答
从SharedPreference中保存和检索ArrayList
public static void addToPreference(String id,Context context) {
SharedPreferences sharedPreferences = context.getSharedPreferences(Constants.MyPreference, Context.MODE_PRIVATE);
ArrayList<String> list = getListFromPreference(context);
if (!list.contains(id)) {
list.add(id);
SharedPreferences.Editor edit = sharedPreferences.edit();
Set<String> set = new HashSet<>();
set.addAll(list);
edit.putStringSet(Constant.LIST, set);
edit.commit();
}
}
public static ArrayList<String> getListFromPreference(Context context) {
SharedPreferences sharedPreferences = context.getSharedPreferences(Constants.MyPreference, Context.MODE_PRIVATE);
Set<String> set = sharedPreferences.getStringSet(Constant.LIST, null);
ArrayList<String> list = new ArrayList<>();
if (set != null) {
list = new ArrayList<>(set);
}
return list;
}
在API 11之后,SharedPreferences Editor接受set。您可以将List转换为HashSet或类似的东西,并像这样存储它。当你把它读回来时,把它转换成一个数组列表,如果需要的话对它排序,你就可以开始了。
//Retrieve the values
Set<String> set = myScores.getStringSet("key", null);
//Set the values
Set<String> set = new HashSet<String>();
set.addAll(listOfExistingScores);
scoreEditor.putStringSet("key", set);
scoreEditor.commit();
你也可以序列化你的数组列表,然后将它保存/读取到SharedPreferences。解决方案如下:
编辑: 下面是将ArrayList作为一个序列化对象保存到SharedPreferences的解决方案,然后从SharedPreferences中读取它。
因为API只支持在SharedPreferences中存储和检索字符串(在API 11之后,它更简单),我们必须序列化和反序列化ArrayList对象,它将任务列表变成一个字符串。
在TaskManagerApplication类的addTask()方法中,我们必须获取共享首选项的实例,然后使用putString()方法存储序列化的ArrayList:
public void addTask(Task t) {
if (null == currentTasks) {
currentTasks = new ArrayList<task>();
}
currentTasks.add(t);
// save the task list to preference
SharedPreferences prefs = getSharedPreferences(SHARED_PREFS_FILE, Context.MODE_PRIVATE);
Editor editor = prefs.edit();
try {
editor.putString(TASKS, ObjectSerializer.serialize(currentTasks));
} catch (IOException e) {
e.printStackTrace();
}
editor.commit();
}
类似地,我们必须从onCreate()方法中的首选项中检索任务列表:
public void onCreate() {
super.onCreate();
if (null == currentTasks) {
currentTasks = new ArrayList<task>();
}
// load tasks from preference
SharedPreferences prefs = getSharedPreferences(SHARED_PREFS_FILE, Context.MODE_PRIVATE);
try {
currentTasks = (ArrayList<task>) ObjectSerializer.deserialize(prefs.getString(TASKS, ObjectSerializer.serialize(new ArrayList<task>())));
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
您可以从Apache Pig项目ObjectSerializer.java中获得ObjectSerializer类
public void saveUserName(Context con,String username)
{
try
{
usernameSharedPreferences= PreferenceManager.getDefaultSharedPreferences(con);
usernameEditor = usernameSharedPreferences.edit();
usernameEditor.putInt(PREFS_KEY_SIZE,(USERNAME.size()+1));
int size=USERNAME.size();//USERNAME is arrayList
usernameEditor.putString(PREFS_KEY_USERNAME+size,username);
usernameEditor.commit();
}
catch(Exception e)
{
e.printStackTrace();
}
}
public void loadUserName(Context con)
{
try
{
usernameSharedPreferences= PreferenceManager.getDefaultSharedPreferences(con);
size=usernameSharedPreferences.getInt(PREFS_KEY_SIZE,size);
USERNAME.clear();
for(int i=0;i<size;i++)
{
String username1="";
username1=usernameSharedPreferences.getString(PREFS_KEY_USERNAME+i,username1);
USERNAME.add(username1);
}
usernameArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, USERNAME);
username.setAdapter(usernameArrayAdapter);
username.setThreshold(0);
}
catch(Exception e)
{
e.printStackTrace();
}
}
下面的代码是公认的答案,为新手(我)多写几行,例如。说明了如何将set类型对象转换回arrayList,并提供了关于`之前操作的附加指导。putStringSet'和。getstringset '。(谢谢你邪恶)
// shared preferences
private SharedPreferences preferences;
private SharedPreferences.Editor nsuserdefaults;
// setup persistent data
preferences = this.getSharedPreferences("MyPreferences", MainActivity.MODE_PRIVATE);
nsuserdefaults = preferences.edit();
arrayOfMemberUrlsUserIsFollowing = new ArrayList<String>();
//Retrieve followers from sharedPreferences
Set<String> set = preferences.getStringSet("following", null);
if (set == null) {
// lazy instantiate array
arrayOfMemberUrlsUserIsFollowing = new ArrayList<String>();
} else {
// there is data from previous run
arrayOfMemberUrlsUserIsFollowing = new ArrayList<>(set);
}
// convert arraylist to set, and save arrayOfMemberUrlsUserIsFollowing to nsuserdefaults
Set<String> set = new HashSet<String>();
set.addAll(arrayOfMemberUrlsUserIsFollowing);
nsuserdefaults.putStringSet("following", set);
nsuserdefaults.commit();
嘿,朋友们,我没有使用Gson库就得到了上述问题的解决方案。我在这里发布源代码。
1.变量声明,即
SharedPreferences shared;
ArrayList<String> arrPackage;
2.变量初始化,即
shared = getSharedPreferences("App_settings", MODE_PRIVATE);
// add values for your ArrayList any where...
arrPackage = new ArrayList<>();
3.使用packagesharedPreferences()将值存储到sharedPreference:
private void packagesharedPreferences() {
SharedPreferences.Editor editor = shared.edit();
Set<String> set = new HashSet<String>();
set.addAll(arrPackage);
editor.putStringSet("DATE_LIST", set);
editor.apply();
Log.d("storesharedPreferences",""+set);
}
4.使用retriveSharedValue()检索sharedPreference的值:
private void retriveSharedValue() {
Set<String> set = shared.getStringSet("DATE_LIST", null);
arrPackage.addAll(set);
Log.d("retrivesharedPreferences",""+set);
}
我希望这对你有帮助…
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