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Android Studio – Cannot resolve some classes in xml file and get red tag like TextView, FrameLayout and all tags that isn't androidx

i did clear project and rebuild, i did invalidate cache and restart, i did remove .idea folder and all of these things did’t work for me.

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2

Answers


  1. 0

    Please check if your parent layout contains these lines or not!

    xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"

    I was also getting this issue but I added the missing line from above and I resolved my issue. Please also check your layout file tags opening and proper closing. Thank you!

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  2. 0

    Please try to upgrade your gradle I faced the same issue, I resolved my issue by upgrading gradle plugin in project level build.gradle file from

    classpath 'com.android.tools.build:gradle:7.0.1'

    to

    classpath 'com.android.tools.build:gradle:7.0.4'
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