Android-Java 列表到字符串，反之亦然

Question

I am new to Android programming and I wanted to create a function to take in a list and return a String. That's my code:

private String List_to_String(final ArrayList<String> list) {
String returnString = "{";
for (String _s : list) {

returnString = returnString + _s.replace(":","\\:") + ":";

}

if (returnString != null && returnString.length() > 0) {
returnString = returnString.substring(0, 
returnString.length() - 1);
}

returnString = returnString.concat("}");

return returnString;
}

It works but now I want to make a function that returns a ArrayList when I give a String generated with the function above also I think you need to take extra care of the ":". So if I have a String

HDJDJJDJ:JSJSJSJJSJS:SJJSHS\:\:JS

the function should return a list with these items

HDJDJJDJ
JSJSJSJJSJS
SJJSHS::JS

Can you understand me Thanks for your help

Answer 1

Maybe you can try something like this.

In Android Studio [File]->[Project Structure]->[Dependencies]->[Add Dependency]->[Library Dependency]-> choose 'app'(If you have multiple modules) -> search for 'GSON' -> choose implementation.

Initialize Gson in java class:

Private Gson gson = new Gson();

String to List:

List<T> myList = new ArrayList<T>();
String myString = gson.toJson(myList);

List to string:

Type myType = new TypeToken<List<T>>(){}.getType();
myList = gson.fromJson(myString, myType);