How to dynamically change ImageView Height

Question

I have a simple linear layout used for ListView\'s cell, and it has an imageview. The image will be downloaded from internet, so the size can be different sizes.

How

Answer 1

You will need to subclass ImageView

Override the onMeasure, I haven't tested this but all the variables you need are there and the idea is correct. You just perform the apply the aspect ratio of the image to the imageviews height, and if it's greater than the width, set it to the width.

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
    Drawable drawable = getDrawable();
    if (drawable != null)
    {
        //get imageview width
        int width =  MeasureSpec.getSize(widthMeasureSpec);


        int diw = drawable.getIntrinsicWidth();
        int dih = drawable.getIntrinsicHeight();
        float ratio = (float)diw/dih; //get image aspect ratio

        int height = width * ratio;

        //don't let height exceed width
        if (height > width){
            height = width;
        }


        setMeasuredDimension(width, height);    
    }
    else
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}