Android Listview Example

Android Listview Example

Android ListView is a view which groups several items and display them in vertical scrollable list. The list items are automatically inserted to the list using an Adapter that pulls content from a source such as an array or database.

An adapter actually bridges between UI components and the data source that fill data into UI Component. Adapter holds the data and send the data to adapter view, the view can takes the data from adapter view and shows the data on different views like as spinner, list view, grid view etc.

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.



activity_list_view_android_example.xml File

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

         <ListView

              android:id="@+id/list"

              android:layout_height="wrap_content"

              android:layout_width="match_parent">

         </ListView>

</LinearLayout>

ListViewAndroidExample.java File

public class ListViewAndroidExample extends Activity {

        ListView listView ;

        

        @Override

        protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.activity_list_view_android_example);

            

            // Get ListView object from xml

            listView = (ListView) findViewById(R.id.list);

            

            // Defined Array values to show in ListView

            String[] values = new String[] { "Android", 

                                             "iPhone",
                                             "WindowsMobile",
                                             "BlackBerry",
                                             "WebOS",
                                             "Ubuntu",
                                             "Windows7",
                                             "Max OS X"

                                            };

    

            // Define a new Adapter

            // First parameter - Context

            // Second parameter - Layout for the row

            // Third parameter - ID of the TextView to which the data is written

            // Forth - the Array of data

    

            ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,

              android.R.layout.simple_list_item_1, android.R.id.text1, values);

    

    

            // Assign adapter to ListView

            listView.setAdapter(adapter); 

            

            // ListView Item Click Listener

            listView.setOnItemClickListener(new OnItemClickListener() {

                  @Override

                  public void onItemClick(AdapterView<?> parent, View view,

                     int position, long id) {

                    

                   // ListView Clicked item index

                   int itemPosition     = position;

                   

                   // ListView Clicked item value

                   String  itemValue    = (String) listView.getItemAtPosition(position);

                      

                    // Show Alert 

                    Toast.makeText(getApplicationContext(),

                      "Position :"+itemPosition+"  ListItem : " +itemValue , Toast.LENGTH_LONG)

                      .show();

                 

                  }

    

             }); 

        }

    

    }