Android 保存列表<String>
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Android save List<String>
提问by Luke Taylor
Is there anyway I can save a List variable to the Androids phone internal or external memory? I know I can save primitive data, yet not sure about this one.
无论如何我可以将 List 变量保存到 Androids 手机的内部或外部存储器中吗？我知道我可以保存原始数据，但不确定这个。
Thanks in advance.
提前致谢。
回答by Blundell
Yes exactly you can only save primitives so you could something like this:
是的，您只能保存原语，因此您可以这样做：
List<String> list = new ArrayList<String>();
list.add("one");
list.add("two");
list.add("three");
StringBuilder csvList = new StringBuilder();
for(String s : list){
csvList.append(s);
csvList.append(",");
}
sharedPreferencesEditor.put("myList", csvList.toString());
Then to create your listagain you would:
然后再创建你的list，你会：
String csvList = sharedPreferences.getString("myList");
String[] items = csvList.split(",");
List<String> list = new ArrayList<String>();
for(int i=0; i < items.length; i++){
list.add(items);
}
You could encapsulate this "serializing" into your own class wrapping a list to keep it nice and tidy. Also you could look at converting your listto JSON.
您可以将此“序列化”封装到您自己的包含列表的类中，以使其保持整洁。您也可以考虑将您list的JSON.
回答by Pir Fahim Shah
If you want to store/retrieve/delete some string value in your program, then Listis better than Array. Here below I will show you that how to use it.
如果你想在你的程序中存储/检索/删除一些字符串值，那么List比Array. 下面我将向您展示如何使用它。
// Declaring List Variable
List<String> Mylist = new ArrayList<String>();
// Adding item to List
Mylist.add(list.size(), "MyStringValue"); //this will add string at the next index
// Removing element form list
Mylist.remove(list.size()-1); //this will remove the top most element from List
