private a :String ? = ""
赋值的时候
textView.text = a ?:"如果a是null,就将这行放进textView"
private a :String ? = ""
赋值的时候
textView.text = a ?:"如果a是null,就将这行放进textView"
private void addAnimation(){ img_show.startAnimation(scaleAnimation()); // img_show.clearAnimat