CODEWITHSUNDEEP
androidarraylist
user10501917
user10501917

Reputation:

How to make Array List use for the other Activity

I'm newcomer about the Android Studio so need to help from everyone.

I have an idea that, I want to make 1 ArrayList<>, and I will use this Array for the other Activity, but I don't know how to make.

For example MainActivity, I call this array. SecondActivity, I also call this array. In this case, I no need to make the same ArrayList for each Activity.

Is it possible to do like that? Please help

Example(); //I want to insert this to the other Activity instead of private void...
     test.setOnClick...

private void Example(){
    arrayList = new ArrayList<>();
    arrayList.add(...)

Upvotes: 0

Views: 825

Answers (3)

Mehrdad
Mehrdad

Reputation: 1637

you can use from this:

In first activity (for example MyActivity) :

public static ArrayList<String> myList=new ArrayList();

in other activity

MyActivity.myList.add("dddd");
MyActivity.myList.get(0);

Upvotes: 0

user1334621
user1334621

Reputation:

You could use Singleton pattern to share variable between your Activity.

public class AppData {
    private List list;
    private static AppData instance;

    private AppData(){};
    public List getList() {return this.list;}
    public void setList(List list) {this.list = list;}

    public static AppData getInstance() {
        if (instance == null) {
             instance = new AppData();
        }
        return instance;
    }
}
//Call this in your activity
List list = AppData.getInstace().getList();

Upvotes: 1

Intsab Haider
Intsab Haider

Reputation: 3561

May be this question is duplicate but as you are new contributor and as per Stack Overflow policy i am telling you!

There are Different ways you can use them accordingly..

1- Make list static and use it anywhere with class reference like MainActivity.list;

2- Pass in your Intent as intent.putExtra("en", list); but be sure that you implemented Serializable in your model as

 public class EN implements Serializable {
  //Your Model Getter setters
}

Upvotes: 3

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