How can I edit the properties of elements in my activity?
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I am a complete noob and I am trying to decrease the padding of an image over time with my code. I have this so far:

        public void growPotato() {
    	long base = System.currentTimeMillis();
    	long WorkingNum = 0;
    	while(growing && WorkingNum > 5 ) {
    		WorkingNum = 150 - ((System.currentTimeMillis() - base)/100);
    		ImageView PotatoPicture = (ImageView) findViewById(R.id.imageView1);
    		PotatoPicture.SetPadding(WorkingNum);
    	}

I get an error on the 'WorkingNum = 150 -' line saying I am missing a ';' for 'LocalVariableDeclarationAssignment'. But my main problem is that I get the error: "The method  SetPadding(long) is undefined for the type ImageView"... How can I work around or fix this?