Question

I want to make number of rows in Gridview dynamic depending upon the screen size of the android phone. so i need height of the Gridview in onCreate() to count number of rows.(height / colums) here is a code snippet::

public class GridActivity extends Activity
{
     GridView gridView;
     GridAdapter adapter;'

     public void onCreate(Bundle savedInstance state)
     {
          setContentView(R.layout.gridview);
          gridView = (GridView) findViewById(R.id.grid);

          adapter = new GridAdapter(this);
          gridView.setAdapter(adapter);

          int gridHeight = gridView.getMeasuredHeight();
          Log.d("tag"," height :: " + gridHeight);
     }
 }

In log cat it shows — height :: 0
I don’t understand y it gives zero after properly inflating.

Is this a bug? Or I am missing something?

Answer 1

GridView would return 0 measuredheight and 0 height unless it is drawn to window, so you can not get height of GridVIew at the point, A workaround of your problem may be:
Add your Nth view to gridView by comparing total height of device with height of GridView occupied after n-1 views has been drawn to screen.

public void addNCompareHeight(View view)
 {   
    ViewTreeObserver observer = grid.getViewTreeObserver();
    observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            //in here, place the code that requires you to know the dimensions.
            //this will be called as the layout is finished, prior to displaying.
            if(gridHeight<requiredHeight)
            {
                 grid.addView(view);
                 addNCompareHeight(next);
            }
        }
    }