@Override
 protected void onRestart() {
   // TODO Auto-generated method stub
   super.onRestart();
   System.out.println("重新开始");
   saveData();
 }
 @Override
 protected void onRestart() {
   super.onRestart();
   Log.d(TAG, "onRestart");
 }
 /** @see android.app.Activity#onRestart() */
 @Override
 protected void onRestart() {
   super.onRestart();
   showList();
 }