I need to change the width of a RelativeLayout from 0 to 600px programmatically, in an animated way. I'm using the following code:

Animation a = new Animation() {
    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        RelativeLayout.LayoutParams drawerParams = (LayoutParams) drawer.getLayoutParams();
        drawerParams.width = 600;
        drawer.setLayoutParams(drawerParams);
    }
};

a.setDuration(1000); //Animate for 1s
layout.startAnimation(a);

However, for some reason this isn't working. Can anyone point me in the right direction?

android animation
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