Android: strange crash on grid scroll-Collection of common programming errors

I’m creating a grid by a standard scheme: GridView is set with a custom BaseAdapter-derivate:

class EventGridAdapter extends BaseAdapter {

    private GregorianCalendar gregorianCalendar;
    Context context;
    GridView gridView;

    public EventGridAdapter(Context context, GridView gridView) {
        this.context = context;
        this.gridView = gridView;
    }


    public int getCount() {
        return 31;
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {

        CalendarItem cell = null;
        if (convertView == null) {
            cell = new CalendarItem(context);
            int viewHeight = gridView.getHeight();
            int spacing = 1;
            int height = viewHeight / 5 - spacing; 
            cell.setMinimumHeight(height);
        } else {
            cell = (CalendarItem) convertView;
        }
        return cell;
    }
} 

About this line:

cell = new CalendarItem(context)

By now CalendarItem is pure View, e.g. everything is commented out, so nothing to cause crash there…

And standard GridView output:

public class CalendarActivity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.calendar);

    GridView g = (GridView) findViewById(R.id.gridCalendar);
    g.setAdapter(new EventGridAdapter(this, g));        
}
}

Layout:

What is the problem:

When I run this code in emulator on ICS 4.0.3, grid is shown perfectly, but when I try to scroll it – program crashes with strange exception:

D/AndroidRuntime( 1087): Shutting down VM W/dalvikvm( 1087): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) E/AndroidRuntime( 1087): FATAL EXCEPTION: main E/AndroidRuntime( 1087): java.lang.IllegalArgumentException: bitmap size exceeds 32bits E/AndroidRuntime( 1087): at android.graphics.Bitmap.nativeCreate(Native Method) E/AndroidRuntime( 1087): at android.graphics.Bitmap.createBitmap(Bitmap.java:605) E/AndroidRuntime( 1087): at android.graphics.Bitmap.createBitmap(Bitmap.java:585) E/AndroidRuntime( 1087): at android.view.View.buildDrawingCache(View.java:10626) E/AndroidRuntime( 1087): at android.view.View.getDrawingCache(View.java:10476) E/AndroidRuntime( 1087): at android.view.ViewGroup.drawChild(ViewGroup.java:2743) E/AndroidRuntime( 1087): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489) E/AndroidRuntime( 1087): at android.widget.AbsListView.dispatchDraw(AbsListView.java:2092) E/AndroidRuntime( 1087): at android.view.View.draw(View.java:11083) E/AndroidRuntime( 1087): at android.widget.AbsListView.draw(AbsListView.java:3398) E/AndroidRuntime( 1087): at android.view.ViewGroup.drawChild(ViewGroup.java:2887) E/AndroidRuntime( 1087): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489) E/AndroidRuntime( 1087): at android.view.ViewGroup.drawChild(ViewGroup.java:2885) E/AndroidRuntime( 1087): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489) E/AndroidRuntime( 1087): at android.view.ViewGroup.drawChild(ViewGroup.java:2885) E/AndroidRuntime( 1087): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489) E/AndroidRuntime( 1087): at android.view.View.draw(View.java:10981) E/AndroidRuntime( 1087): at android.widget.FrameLayout.draw(FrameLayout.java:450) E/AndroidRuntime( 1087): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2126) E/AndroidRuntime( 1087): at android.view.ViewRootImpl.draw(ViewRootImpl.java:2026) E/AndroidRuntime( 1087): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1634) E/AndroidRuntime( 1087): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442) E/AndroidRuntime( 1087): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime( 1087): at android.os.Looper.loop(Looper.java:137) E/AndroidRuntime( 1087): at android.app.ActivityThread.main(ActivityThread.java:4424) E/AndroidRuntime( 1087): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 1087): at java.lang.reflect.Method.invoke(Method.java:511) E/AndroidRuntime( 1087): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) E/AndroidRuntime( 1087): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) E/AndroidRuntime( 1087): at dalvik.system.NativeStart.main(Native Method)

When I run the same code in emulator on 2.3.3 – everything is fine!

After some investigation I found the “source” of the problem (-. Look again at getView method in EventGridAdapter:

        int viewHeight = gridView.getHeight();
        int spacing = 1;
        int height = viewHeight / 5 - spacing; 
        cell.setMinimumHeight(height);

The problem line is:

cell.setMinimumHeight(height);

When I change it to:

cell.setMinimumHeight(10);

… crashes dissapear

But I don’t know what do I do wrong? Everything looks logically correct: I need 5 rows. Also, making height lower doesn’t help (when all rows are in a view area, e.g. no scroll needed):

int height = viewHeight / 7 - spacing;

Your advices?

1. the problem is hear…

   gridView.getHeight()
   

   why? because you will not have the height of the gridview @ the time it just created

   you can use this method in either onWindowfocuschanged or by using viewTreeobserver

   like the one below

   ViewTreeObserver vto1 = gridView.getViewTreeObserver();
           vto1.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
   
               public void onGlobalLayout() {
                   // write hear for height
   
                   Log.i(TAG, "from VTO" + gridView.getHeight());
                   ViewTreeObserver obs = gridView.getViewTreeObserver();
                   obs.removeGlobalOnLayoutListener(this);
               }
           });