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[Java] Android控制双击返回按钮退出程序 →→→→→进入此内容的聊天室

来自 , 2019-05-11, 写在 Java, 查看 130 次.
URL http://www.code666.cn/view/70bb83c9
  1. private static long back_pressed;
  2.  
  3. @Override
  4. public void onBackPressed()
  5. {
  6.         if (back_pressed + 2000 > System.currentTimeMillis()) super.onBackPressed();
  7.         else Toast.makeText(getBaseContext(), "Press once again to exit!", Toast.LENGTH_SHORT).show();
  8.         back_pressed = System.currentTimeMillis();
  9. }
  10. //java/8472

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