Droid Face ListView – The ListView and GridView are subclasses of AdapterView and they can be populated by binding them to an Adapter, which retrieves data from an external source and creates a View that represents each data entry.
Android provides several subclasses of Adapter that are useful for retrieving different kinds of data and building views for an AdapterView ( i.e. ListView or GridView). The common adapters are ArrayAdapter,Base Adapter, CursorAdapter, SimpleCursorAdapter,SpinnerAdapter and WrapperListAdapter. We will see separate examples for both the adapters.
Following is the content of the modified main activity file src/com.example.ListDisplay/ListDisplay.java. This file can include each of the fundamental life cycle methods.
import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.ArrayAdapter; import android.widget.ListView;
public class ListDisplay extends Activity { // Array of strings… String[] mobileArray = {“Android”,”IPhone”,”WindowsMobile”,”Blackberry”, “WebOS”,”Ubuntu”,”Windows7″,”Max OS X”};
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
ArrayAdapter adapter = new ArrayAdapter<String>(this, R.layout.activity_listview, mobileArray);
ListView listView = (ListView) findViewById(R.id.mobile_list); listView.setAdapter(adapter); } }
Following will be the content of res/layout/activity_main.xml file −
<ListView android:id=”@+id/mobile_list” android:layout_width=”match_parent” android:layout_height=”wrap_content” > </ListView>
</LinearLayout>
Following will be the content of res/values/strings.xml to define two new constants −
Following will be the content of res/layout/activity_listview.xml file −
<TextView xmlns:android=”http://schemas.android.com/apk/res/android” android:id=”@+id/label” android:layout_width=”fill_parent” android:layout_height=”fill_parent” android:padding=”10dip” android:textSize=”16dip” android:textStyle=”bold” > </TextView>
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