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
使用Kotlin和GSON:
fun <T> SharedPreferences.writeList(gson: Gson, key: String, data: List<T>) {
val json = gson.toJson(data)
edit { putString(key, json) }
}
inline fun <reified T> SharedPreferences.readList(gson: Gson, key: String): List<T> {
val json = getString(key, "[]") ?: "[]"
val type = object : TypeToken<List<T>>() {}.type
return try {
gson.fromJson(json, type)
} catch(e: JsonSyntaxException) {
emptyList()
}
}
其他回答
您可以将其转换为JSON字符串,并将字符串存储在SharedPreferences中。
正如@nirav所说,最好的解决方案是使用Gson实用工具类将其作为json文本存储在sharedpreferences中。下面是示例代码:
//Retrieve the values
Gson gson = new Gson();
String jsonText = Prefs.getString("key", null);
String[] text = gson.fromJson(jsonText, String[].class); //EDIT: gso to gson
//Set the values
Gson gson = new Gson();
List<String> textList = new ArrayList<String>(data);
String jsonText = gson.toJson(textList);
prefsEditor.putString("key", jsonText);
prefsEditor.apply();
请在kotlin中使用这两种方法将数据存储在ArrayList中
fun setDataInArrayList(list: ArrayList<ShopReisterRequest>, key: String, context: Context) {
val prefs = PreferenceManager.getDefaultSharedPreferences(context)
val editor = prefs.edit()
val gson = Gson()
val json = gson.toJson(list)
editor.putString(key, json)
editor.apply()
}
fun getDataInArrayList(key: String, context: Context): ArrayList<ShopReisterRequest> {
val prefs = PreferenceManager.getDefaultSharedPreferences(context)
val gson = Gson()
val json = prefs.getString(key, null)
val type = object : TypeToken<ArrayList<ShopReisterRequest>>() {
}.type
return gson.fromJson<ArrayList<ShopReisterRequest>>(json, type)
}
//Set the values
intent.putParcelableArrayListExtra("key",collection);
//Retrieve the values
ArrayList<OnlineMember> onlineMembers = data.getParcelableArrayListExtra("key");
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
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