Make GridView or GridLayoutManager items square.

gallery_item.xml

<net.twisterrob.android.view.SquareFrameLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	android:id="@id/adapterRoot"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:layout_margin="@dimen/margin"
	android:padding="@dimen/margin"
	>
	<ImageView
		android:id="@id/image"
		android:layout_width="fill_parent"
		android:layout_height="fill_parent"
		android:focusable="false"
		android:scaleType="fitCenter"
		/>
	<ImageView
		android:id="@id/type"
		android:layout_width="@dimen/icon_size"
		android:layout_height="@dimen/icon_size"
		android:layout_gravity="bottom|end"
		android:layout_marginRight="@dimen/margin"
		android:layout_marginBottom="@dimen/margin"
		android:layout_marginEnd="@dimen/margin"
		android:scaleType="fitCenter"
		/>

SquareFrameLayout.java

package net.twisterrob.android.view;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.FrameLayout;

public class SquareFrameLayout extends FrameLayout {
	public SquareFrameLayout(Context context) {
		super(context);
	}

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

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

	@Override
	public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		//noinspection SuspiciousNameCombination
		super.onMeasure(widthMeasureSpec, widthMeasureSpec);
	}
}

Nice work dude.