What is wrong in my code

No I am using editor.appybuilder.com

Use ide.niotron.com

It's very fast, compiling time takes hardly 9 seconds.

its better to use visual studio code to debug error and get a clean code because it completes your code by a simple pop up

Visual Studio Code - Code Editing. Redefined

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Thankyou very much

remove this

if you know java then only give solution you are totally giving the wrong solution

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and @Faraz_Firoz i already said first import the class you are using to make cardview the CustomCardView is nothing you just made it up android does not recognize it it is not giving error on it because your extension (class) name is CustomCardView

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