A GridView that uses the necessary height to wrap all of it's children, instead of scrolling

WrappingGridView.java

// http://www.jayway.com/2012/10/04/how-to-make-the-height-of-a-gridview-wrap-its-content/

public class WrappingGridView extends GridView {

    public WrappingGridView(Context context) {
        super(context);
    }

    public WrappingGridView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public WrappingGridView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int heightSpec = heightMeasureSpec;
        if (getLayoutParams().height == LayoutParams.WRAP_CONTENT) {
            // The great Android "hackatlon", the love, the magic.
            // The two leftmost bits in the height measure spec have
            // a special meaning, hence we can't use them to describe height.
            heightSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
        }
        super.onMeasure(widthMeasureSpec, heightSpec);
    }

}

Works on my nexus 7 (Android 4.4.4) but on my phone (ZTE z665c with android 4.1.1) all I see is "Header 1"

Hi dude, first of all thanks for sharing.
So could you please let us know which distribute license have you been associated to this class ?

Hey,I don't understand this line.
heightSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
How does it work?