Single Choice Lists and onClick events

I have a CHOICE_MODE_SINGLE list with 3 rows. How do I place an onClick event that changes the value of an arbitrary variable, so that if Row 1 is clicked, say, the value of X = 1, and when Row 2 is clicked, the value of X = 2, etc.?

    public class List extends ListActivity {  
 @Override    
    public void onCreate(Bundle savedInstanceState) {        
        super.onCreate(savedInstanceState);        
        setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice, GENRES));        
        final ListView listView = getListView();        
        listView.setItemsCanFocus(false);        
        listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 开发者_如何学运维   
    }    

private static final String[] GENRES = new String[] {"Barre", "Buffumville","Hodges"};
}

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Its quite simple..rather than extending ListActivity extend it by Activity and just declare listview in your XML file as below:

<ListView 
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>

initialize listview in your activity:

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

And after setting adapter as you did,set the item click listener of the listview as below in your code:

listView.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> parent, View v, int position,
                    long id) {
                Toast.makeText(getBaseContext(), GENRES[position], Toast.LENGTH_SHORT).show();
            }
        });

By doing this you will get the desired value of that position of listview. You will surely get the result you want.

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You want to set the onItemClickListener on the list view.

listView.setOnItemClickListener(
     new OnItemClickListener(
          @Override
          onItemClick(AdapterView<?> listView, View cell, int position, long id) {
               // Code to change variables
          }
     });

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You can implement protected void onListItemClick (ListView l, View v, int position, long id) in your ListActivity, and the position variable lets you know which item was clicked.