android:interpolator="@android:anim/linear_interpolator"  
android:repeatMode="restart"  
android:repeatCount="infinite"

方法二：
①Animation設定setAnimationListener(new ReStartAnimationListener())
②ReStartAnimationListener()具體實現

    /**
     * 重複啟動動畫
     */
    private class ReStartAnimationListener implements
 
 Animation.AnimationListener {

        public void onAnimationEnd(Animation animation) {
            // TODO Auto-generated method stub
            animation.reset();
            animation.setAnimationListener(new ReStartAnimationListener());
            animation.start();
        }

        public void
 
 onAnimationRepeat(Animation animation) {
            // TODO Auto-generated method stub

        }

        public void onAnimationStart(Animation animation) {
            // TODO Auto-generated method stub

        }

    }