AspectRatioImageView.java

/*
 * The MIT License (MIT)
 * 
 * Copyright � 2013 Clover Studio Ltd. All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.cloverstudio.spikademo.view;

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

/**
 * AspectRatioImageView
 * 
 * ImageView that calculates it's height according to width and aspect ratio of it's image source.
 */

public class AspectRatioImageView extends ImageView {

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

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

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

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		
		if (getDrawable() != null) {
			int width = MeasureSpec.getSize(widthMeasureSpec);
			int height = width * getDrawable().getIntrinsicHeight()
					/ getDrawable().getIntrinsicWidth();
			setMeasuredDimension(width, height);
			
		} else {
			setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);
		}
	}
}