Can not resolve method 'findViewById(int)'

Question

I\'m having a trouble with findViewByid but I can\'t find where the problem is.

Here\'s my FirstFragment class code:

import and         


        

Answer 1

I had this problem when I downloaded sample project from github. This project had

compileSdkVersion 23
buildToolsVersion "23.0.0"
targetSdkVersion 23

in Activity context and findViewById() were in red color inside onCreate() method. So I updated the above versions to

compileSdkVersion 25
buildToolsVersion "25.0.3"
targetSdkVersion 25

and error got resolved.