Problem Description:
In MainActivity.java, look for the checkbox by id, which can obviously display the id of this component, and Ctrl+click can also jump to the past, but it is popular, prompting @layout/activity_main does not contain a declaration with id XXX
jump successfully
Solution:
Turns out setContentView(R.layout.activity_main); did not change. Change setContentView(R.layout.activity_main); to the file name where the id you are looking for can be found.
