Android双击两次返回键退出应用

Posted 2021-07-28 小zhong

activity里添加如下代码：

 //重写onKeyUp(),实现连续两次点击可退出当前应用
private long firstTime = 0;
@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        long secondTime = System.currentTimeMillis();

        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (secondTime - firstTime < 2000) {
                System.exit(0);
			} else {
                MyToast.makeText(MainActivity.this, "再按一次退出程序");
                firstTime = System.currentTimeMillis();
            }

            return true;
        }

        return super.onKeyDown(keyCode, event);
    }