How to combine two array list and show in a listview in android

Question

I want to combine two ArrayList into a single one.

My first arraylist looks like this:

{a,s,d,f,g,h,......}

My second arraylist lo

Answer 1

Combine two ArrayList into a single one

firstname1.addAll(first);

Please refer this article for sample code to concat two lists.

How to show these items in list view :

your layout should be ( as I used main.xml)

and now Activity as CustomListView.java

public class CustomListView extends Activity {

    ArrayList firstname1;
    ArrayList first;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        firstname1 = new ArrayList();
        first = new ArrayList();
        //Let both array list having some data

        firstname1.add("firstname1_data1");
        firstname1.add("firstname1_data2");
        firstname1.add("firstname1_data3");
        firstname1.add("firstname1_data4");
        firstname1.add("firstname1_data5");
        firstname1.add("firstname1_data6");
        firstname1.add("firstname1_data7");
        firstname1.add("firstname1_data8");
        firstname1.add("firstname1_data9");
        firstname1.add("firstname1_data10");

        first.add("first_data1");
        first.add("first_data2");
        first.add("first_data3");
        first.add("first_data4");
        first.add("first_data5");
        first.add("first_data6");
        first.add("first_data7");
        first.add("first_data8");
        first.add("first_data9");
        first.add("first_data10");

        //Now copying value of first to firstname, as your requirement
        //Please refer http://www.java-examples.com/append-all-elements-other-collection-java-arraylist-example for sample code to concat two lists.
        firstname1.addAll(first);

        //Lets show your data into list view

        // Get a handle to the list view
        ListView lv = (ListView) findViewById(R.id.custom_list_view);

        lv.setAdapter(new ArrayAdapter(CustomListView.this,
                android.R.layout.simple_list_item_1, firstname1));
        //Please refer http://developer.android.com/reference/android/widget/ListView.html for details of setAdapter()
    }
}

Happy coding.