AspectRatioImageView.java

package de.htwdd;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class AspectRatioImageView extends ImageView
{

    public AspectRatioImageView(Context context)
    {
        super(context);
        // TODO Auto-generated constructor stub
    }

    public AspectRatioImageView(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }

    public AspectRatioImageView(Context context, AttributeSet attrs,
                                int defStyle)
    {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        Drawable d = getDrawable();

        if (d != null)
        {
            // ceil not round - avoid thin vertical gaps along the left/right edges
            int width = MeasureSpec.getSize(widthMeasureSpec);
            int height = (int) Math.ceil((float) width * (float) d.getIntrinsicHeight() / (float) d.getIntrinsicWidth());
            setMeasuredDimension(width, height);
        }
        else
        {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

}