Example of square gridview items

gridViewItem.xml

<?xml version="1.0" encoding="utf-8"?>
<com.your.app.SquareView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <ImageView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/image"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:adjustViewBounds="true"
        android:contentDescription="@string/descr_image"
        android:scaleType="centerCrop" />

</com.your.app.SquareView>

SquareView.java

package pl.garnek;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

public class SquareView extends ViewGroup {

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

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

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

	@Override
	protected void onLayout(boolean changed, int l, int u, int r, int d) {
		getChildAt(0).layout(0, 0, r - l, d - u); // Layout with max size
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

		View child = getChildAt(0);
		child.measure(widthMeasureSpec, widthMeasureSpec);
		int width = resolveSize(child.getMeasuredWidth(), widthMeasureSpec);
		child.measure(width, width); // 2nd pass with the correct size
		setMeasuredDimension(width, width);
	}

}

i'm stilll confused , could you please make a full example? thanks