Question

Following shows the code and screenshot for displaying data in listview containing 3 textview.

I tried the following code in getView() method of Adapter class to give background image to alternate rows i.e. row no. 0,2,4,etc.

When I try to implement this, I get the output as shown in screen-shots i.e. row are not getting effected appropriately.

Also, refer to below xml in which alignTop and alignBottom parameters are used, still on Index button click, 2nd and 3rd textview are not getting background color appropriately.

EDIT – If I use colour instead of image for background, it works well for all cases except for Index button.

if (count % 2 == 0) {

    try {

        InputStream is = ctx.getAssets().open("cellbg.png");
        Drawable d = Drawable.createFromStream(is, "cellbg");
        holder.txtFirst.setBackgroundDrawable(d);
        holder.txtSecond.setBackgroundDrawable(d);
        holder.txtThird.setBackgroundDrawable(d);
        Log.v("count=", "" + (count++));

    } catch (Exception e) {
        throw new Error(" exception in TableListAdapter " + e.getMessage());
    }
} else {
    Log.v("else count==", "" + (count++));
}      

list structure(xml)

<TextView
        android:id="@+id/FirstText"
        android:layout_width="80dp"
        android:layout_height="wrap_content"/>
    
    <TextView
        android:id="@+id/SecondText"
        android:layout_width="55dp"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/FirstText"
        android:layout_alignBottom="@+id/FirstText"/>
    
    <TextView
        android:id="@+id/ThirdText"
        android:layout_width="40dp"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/FirstText"
        android:layout_alignBottom="@+id/FirstText"/>

1st screen shows the list structure at the time of application launch, where by default, Gainers button is pressed.

2nd shows an instance of pressing Index button.

3rd shows an instance of pressing Gainers button again after pressing index button.

4th shows the layout when List item is clicked.

What am I doing wrong?

ANY HELP WILL BE LIFE-SAVER !!!

Answer 1

Couple of things…. not sure what the different buttons are and what they do, but it should not matter…

You should set the background also when (count % 2 != 0) because the views can be reused in the list, so better be safe.

Also, instead of setting the background for the different TextViews individually, why not set it only for the ViewGroup that contains all those TextViews (I imagine a LinearLayout or something like that) ?

Just to double check, count is the argument you get when getView gets called ?
Maybe you could post a bit more code of your getView method, that would probably help (to get a better answer).