Building a simple android app >learning the language> extra credit I want diff random background images for each answer

There are several approaches you can take to achieve the desired result. I recommend storing your images in the respective drawable resource folder(s). Then, create a reference to the imageView within the void onCreate(View) method. To change the background image with every random prediction, in your void onCreate(View) method, use a series of if or a switch statement to determine the value of the String answer variable by comparing it to the desired element within the set of answers declared in your CrystalBall class. Finally, set the image resource of the imageView to the appropriate drawable resource. Your code may look something like this:

public void onCreate(View arg0)
{
  String answer = mCrystalBall.getAnAnswer();
  // Reference the existing ImageView within you layout.
  ImageView imageView = (ImageView)findViewById(R.id.imageView1);

  switch(true) {
    // Check if the random answer return by the `getAnAnswer()` method is equal to the desired answer.
    case answer.equals(mCrystalBall.mAnswer[0]):
      // Set the desired drawable (image) as the content of the `imageView`
      imageView.setImageResource(R.drawable.someImageName);
      break;
    … 
    default:
       // Declare any fall-through cases
       break;
  }

  answerLabel.setText(answer);
}