Android基础--Android Studio报错信息：Can only use lower 16 bits for requestCode

Caused by: java.lang.IllegalArgumentException: Can only use lower 16 bits for requestCode

 startActivityForResult(intent, R.id.scan);

startActivityForResult(Intent intent, int requestCode)
以上我的代码是以R.id.R.id.scan作为requestCode的值，这个值是超过了16字节数

原因是RequestCode不能为负值,也不能大于16位bit值65536

判断RequestCode的源码:

@Override      public void startActivityForResult(Intent intent, int requestCode) {          if (requestCode != -1 && (requestCode&0xffff0000) != 0) {              throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");          }          super.startActivityForResult(intent, requestCode);      }