How to change ImageView source in Activity onCreate

I am working 开发者_如何学JAVAon a android app and I have 3 diff images in my res/drawable and I would like to change which images gets displayed from writing code in my OnCreate in the Acitvity. can this be done?

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Its very easy to set the change the image of an imageview at runtime:

imgView.setImageResource(R.drawable.newImage);