Passing ArrayList of an object from one activity to another in android

Question

So the case is i want to send data from one activity to another with the help of ArrayList of objects. Below is the class code which i want to use as object. So please tell me t

Answer 1

1st Activity

        Arraylist<String> values;

        Intent it=new Intent(MainActivity.this,Next.class);
        it.putExtra("value", values);
        startActivity(it);

2nd Activity

  Arraylist<String> list;

list=(ArrayList<String>) getIntent().getSerializableExtra("value");

Answer 2

Try this, put you arraylist using putStringArrayListExtra

Intent i = new Intent(MainActivity.this,Nextactivity.class);
i.putStringArrayListExtra("arraylist", arraylist);

And get arraylist.

Intent i = getIntent();
list = i.getIntegerArrayListExtra("arraylist");

Answer 3

First in your custom Class create two methods

public class Qabir {

public int age;
public String name;

Qabir(){
}

Qabir(int age,String name){
    this.age=age; this.name=name;
}   

// method for sending object
public String toJSON(){
    return "{age:" + age + ",name:\"" +name +"\"}";
}

// method for get back original object
public void initilizeWithJSONString(String jsonString){

    JSONObject json;        
    try {
        json =new JSONObject(jsonString );
        age=json.getInt("age");
        name=json.getString("name");
    } catch (JSONException e) {
        e.printStackTrace();
    } 
}

}

then create a function to send object list

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Qabir q1 = new Qabir(22, "KQ");
    Qabir q2 = new Qabir(23, "K Q");
    Qabir q3 = new Qabir(24, "K_Q");

    ArrayList<Qabir> list = new ArrayList<Qabir>();

    list.add(q1);
    list.add(q2);
    list.add(q3);

    Intent in = new Intent(this, SubActivity.class);
    in.putExtra("obj", arrayListToJSON(list));
    startActivity(in);
}

private String arrayListToJSON(ArrayList<Qabir> al) {
    JSONArray array = new JSONArray();
    try {
        for (int i = 0; i < al.size(); i++) {
            array.put(new JSONObject(al.get(i).toJSON()));
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }
    return array.toString();
}

and create another function on receiver

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ArrayList<Qabir> list = new ArrayList<Qabir>();

    list = getObjectList(getIntent().getStringExtra("obj"));

    Log.e("Activity 2", "" +list.size());
}

private ArrayList<Qabir> getObjectList(String st) {

    ArrayList<Qabir> list = new ArrayList<Qabir>();
    JSONArray array = null;
    try {
        array = new JSONArray(st);
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    for (int i = 0; i < array.length(); i++) {
        try {
            Qabir q= new Qabir();
             q.initilizeWithJSONString(""+array.get(i));
             list.add(q);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
    return list;
}

Enjoy....