Android problem related OnItemClickListener of ListView

Question

I have a ListView in my layout. Here is the layout for list item.

shopitem.xml

<?xml version="1.0" encoding="utf-8"?>
<TwoLineListItem xmlns:android="http://schemas.android.com/apk/res/android" 
    android:paddingTop="2dip"
    android:paddingBottom="2dip"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:mode="twoLine"> 
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/text1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingTop="6dip"
        android:paddingLeft="44dip"
        android:textStyle="bold" 
        android:lines="1"
        android:textColor="#FFFFFF"/>
    <ImageView
            android:id="@+id/playBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="3dip"
            android:layout_alignRight="@android:id/text1"
            android:src="@drawable/btnplaypreview"/>            
</TwoLineListItem>

Now I want to set some change of image in playBtn OnItemClickListener. For that I am using the following code.

ListView shopActivityListView = (ListView) findViewById(R.id.shopActivityListView);
shopActivityListView.setCacheColorHint(Color.TRANSPARENT);
shopActivityListView.setAdapter(new ArrayAdapter<String>(getApplicationContext(), R.layout.shopitem, trackArr[1]));

shopActivityListView.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View vItem, int position, long id) {
    // TODO Auto-generated method stub
    ImageView playBtn = (ImageView) vItem.findViewById(R.id.playBtn);
    playBtn.setImageResource(R.drawable.eq12);
}                
});

But nothing is happening on itemclick. I have checked that onItemClick method is executing without any exception. But nothing is changing. What is the problem in my code?

Answer 1

The image in any item of Listview cannot change directly as it is controlled by Adapter. Only getView() method of the adapter can set any view in the items. Therefore, in onItemClick method, we have to set a position specific flag and then call the notifyDataSetChanged() for the adapter. Moreover, a custom adapter is needed, where we have to define the getView() method so that we have set the image depending on the above position specific flag.