1 @Override
2 public boolean onKeyDown(int keyCode, KeyEvent event) {
3 if (keyCode == KeyEvent.KEYCODE_BACK)
4 {
5 if ((System.currentTimeMillis() - mExitTime) > 2000) { //第一种：判断2次按后退键间隔是否在2秒内
6 /*if(event.getRepeatCount() == 0) //第二种，判断是否重复按后退键
7 {*/
8 System.out.println(mExitTime);
9 Object mHelperUtils;
10 showTips(R.drawable.tips_smile, "再按一次返回桌面");
11 mExitTime = System.currentTimeMillis();
12
13 } else {
14 finish();
15 }
16 return true;
17 }
18 return super.onKeyDown(keyCode, event);
19 }
