private a :String ? = ""
賦值的時候
textView.text = a ?:"如果a是null,就將這行放進textView"
private a :String ? = ""
賦值的時候
textView.text = a ?:"如果a是null,就將這行放進textView"
private void addAnimation(){ img_show.startAnimation(scaleAnimation()); // img_show.clearAnimat