Animation image Aléatoire

Voici le code que j'ai pour l'instant :
Code:
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public SpinFragment(){}
 
	private Button btnRotate, btnstop;
    private ImageView imgview;
    AnimationListener listener;
    Random rand = new Random();
    int milis = (rand.nextInt(10) + 2)*1000;
 
 
	@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
 
        View rootView = inflater.inflate(R.layout.fragment_spin, container, false);
        TextView txt = (TextView) rootView.findViewById(R.id.textView1);
        Typeface font = Typeface.createFromAsset(getActivity().getAssets(), "fonts/harabara.ttf");
        txt.setTypeface(font);
 
        final ImageView iv = (ImageView) rootView.findViewById(R.id.image_arrow);
 
        btnRotate = (Button) rootView.findViewById(R.id.start);
        btnstop = (Button) rootView.findViewById(R.id.stop);
 
        final Animation rotation = AnimationUtils.loadAnimation(getActivity(), R.anim.button_rotate);
        rotation.setRepeatCount(Animation.INFINITE);
        rotation.setAnimationListener(listener);
 
        btnRotate.setOnClickListener(new OnClickListener() {
 
			@Override
			public void onClick(View v) {
 
				iv.startAnimation(rotation);
 
				new java.util.Timer().schedule( 
		                 new java.util.TimerTask() {
		                  @Override
		                  public void run() {
		                	  iv.clearAnimation();
		                  }
		             }, milis);
 
		}
	});
 
 
 
        return rootView;
    }
}