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
使用这个自定义类:
public class SharedPreferencesUtil {
public static void pushStringList(SharedPreferences sharedPref,
List<String> list, String uniqueListName) {
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt(uniqueListName + "_size", list.size());
for (int i = 0; i < list.size(); i++) {
editor.remove(uniqueListName + i);
editor.putString(uniqueListName + i, list.get(i));
}
editor.apply();
}
public static List<String> pullStringList(SharedPreferences sharedPref,
String uniqueListName) {
List<String> result = new ArrayList<>();
int size = sharedPref.getInt(uniqueListName + "_size", 0);
for (int i = 0; i < size; i++) {
result.add(sharedPref.getString(uniqueListName + i, null));
}
return result;
}
}
使用方法:
SharedPreferences sharedPref = getPreferences(Context.MODE_PRIVATE);
SharedPreferencesUtil.pushStringList(sharedPref, list, getString(R.string.list_name));
List<String> list = SharedPreferencesUtil.pullStringList(sharedPref, getString(R.string.list_name));
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();
您可以使用序列化或Gson库将列表转换为字符串,反之亦然,然后将字符串保存在首选项中。
使用谷歌的Gson库:
//Converting list to string
new Gson().toJson(list);
//Converting string to list
new Gson().fromJson(listString, CustomObjectsList.class);
使用Java序列化:
//Converting list to string
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(list);
oos.flush();
String string = Base64.encodeToString(bos.toByteArray(), Base64.DEFAULT);
oos.close();
bos.close();
return string;
//Converting string to list
byte[] bytesArray = Base64.decode(familiarVisitsString, Base64.DEFAULT);
ByteArrayInputStream bis = new ByteArrayInputStream(bytesArray);
ObjectInputStream ois = new ObjectInputStream(bis);
Object clone = ois.readObject();
ois.close();
bis.close();
return (CustomObjectsList) clone;
您可以将其转换为Map Object来存储它,然后在检索SharedPreferences时将值更改回ArrayList。
以上答案都是正确的。:)我自己就用了其中一个。然而,当我读到这个问题时,我发现这篇文章实际上是在谈论一个不同的场景,如果我没有弄错的话。
"我需要这个数组一直存在即使用户离开了活动然后想要在稍后的时间回来"
实际上,他希望数据一直存储到应用程序打开为止,而不管用户在应用程序中更换屏幕。
“然而,我不需要阵列可用后,应用程序已完全关闭”
但是一旦应用程序关闭,数据就不应该被保存。因此,我觉得使用SharedPreferences并不是最优的方式。
对于这个需求,我们可以创建一个扩展Application类的类。
public class MyApp extends Application {
//Pardon me for using global ;)
private ArrayList<CustomObject> globalArray;
public void setGlobalArrayOfCustomObjects(ArrayList<CustomObject> newArray){
globalArray = newArray;
}
public ArrayList<CustomObject> getGlobalArrayOfCustomObjects(){
return globalArray;
}
}
通过setter和getter,可以从应用程序中的任何地方访问ArrayList。最好的部分是一旦应用程序关闭,我们不必担心数据被存储。:)
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