Making square relative layouts based on height or width of layout.

square_layout.xml

<SquareRelativeLayoutByHeight xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content>
  </SquareRelativeLayoutByHeight>
<!-- similarly SquareRelativeLayoutByWidth can be used -->

SquareRelativeLayoutByHeight.java

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

/**
 * A RelativeLayout that will always be square -- same width and height,
 * where the width is based off the height.
 */
public class SquareRelativeLayoutByHeight extends RelativeLayout {

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

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

    public SquareRelativeLayoutByHeight(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public SquareRelativeLayoutByHeight(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // Set a square layout based on height value
        super.onMeasure(heightMeasureSpec, heightMeasureSpec);
    }

}

SquareRelativeLayoutByWidth.java

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

/**
 * A RelativeLayout that will always be square -- same width and height,
 * where the height is based off the width.
 */
public class SquareRelativeLayoutByWidth extends RelativeLayout {

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

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

    public SquareRelativeLayoutByWidth(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public SquareRelativeLayoutByWidth(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // set square layout based on width value
        super.onMeasure(widthMeasureSpec, widthMeasureSpec);
    }

}