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I'm repairing my friend's code and got confused.
My friend wants to fetch entered text (in EditText). Seems easy, right? Well, it is but instead of user input, he gets this warning/error:
To be honest I'm not sure how to fix it. He is coding in Kotlin (Android 10).
Activity that contains EditText:
And XML:
This is how it looks when debugging:
The app started working just fine after running "File -> invalidate Cashes/Restart" option, I just don't understand where this warning came from and how to fix it because the error remained unchanged (even though the app works). Do you have an idea how to solve it?
All the best!
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Use the is operator or its negated form !is to perform a runtime check that identifies whether an object conforms to a given type: In most cases, you don't need to use explicit cast operators in Kotlin because the compiler tracks the is -checks and explicit casts for immutable values and inserts (safe) casts automatically when necessary:
Usually, the cast operator throws an exception if the cast isn't possible. And so, it's called unsafe. The unsafe cast in Kotlin is done by the infix operator as. Note that null cannot be cast to String, as this type is not nullable. If y is null, the code above throws an exception.
This issue occurs because Android Studio was not able to detect the default MainActivity in your Android Studio Project. In this article, we will take a look at four different ways with which we can fix this error in your Android Project.
Type erasure and generic type checks Kotlin ensures type safety for operations involving generics at compile time, while, at runtime, instances of generic types don't hold information about their actual type arguments. For example, List<Foo> is erased to just List<*>.
fyi lambda expression like setOnClickListener from kotlin is not debuggable, see here.
if you want to debug variables inside setOnClickListener you should use the normal one e.g. setOnClickListener(object: View.OnClickListener {..})
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sometimes there will be problem in auto generated binding files, if so it will be solved after invalidate cache and restart ide. sometimes the warning/error show but the project and complied without errors. so no need to worry about that. for next time post the code as code not screen shots.
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