How to Populate a ListView with an ArrayList in Android?

Populating a ListView with an ArrayList in Android

Problem:

You seek assistance in populating a ListView with data retrieved from an ArrayList in your Android application.

Solution:

To populate a ListView with an ArrayList, you will need to use an ArrayAdapter. The ArrayAdapter bridges the gap between your ArrayList and the items in your layout's ListView, Spinner, etc. It expects a single TextView as the default resource ID.

According to the Android developer guide:

"The ListAdapter manages a ListView backed by an array of arbitrary objects. It assumes the provided resource ID references a single TextView. Override getView(int, View, ViewGroup) to return the type of view you want."

Code Example:

public class YourActivity extends Activity {

    private ListView lv;

    public void onCreate(Bundle saveInstanceState) {
         setContentView(R.layout.your_layout);

         lv = (ListView) findViewById(R.id.your_list_view_id);

         // ArrayList instantiation (you might already have one)
         List<String> your_array_list = new ArrayList<String>();
         your_array_list.add("foo");
         your_array_list.add("bar");

         // ArrayAdapter creation
         ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(
                 this, 
                 android.R.layout.simple_list_item_1,
                 your_array_list );

         lv.setAdapter(arrayAdapter); 
    }
}

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