IssueTracker

Component used: lifecycle-livedata-kt
Version used: 2.3.0-alpha02
Devices/Android versions reproduced on: N/A

• Not published yet

According to the release note, a new lint check for the null value of MutableLiveData is released.
However, It seems not available yet.

• Lint check fails

In addition, I tried the lint check from AOSP source code, but it fails.

The lint check with a local variable is working. But, instance fields like below code is failed.

class Example {
    val foo = MutableLiveData<Boolean>()

    fun test() {
        foo.value = null
    }
}

Part of the stack trace. I will attach the full stack trace file.

(Run LINT_PRINT_STACKTRACE=true ./gradlew lint)

java.lang.ClassCastException: org.jetbrains.kotlin.asJava.elements.KtLightMethodImpl cannot be cast to com.intellij.psi.PsiVariable
        at androidx.lifecycle.lint.NonNullableMutableLiveDataDetector.visitMethodCall(NonNullableMutableLiveDataDetector.kt:83)
        at com.android.tools.lint.client.api.UElementVisitor$DelegatingPsiVisitor.visitMethodCallExpression(UElementVisitor.kt:1082)
        at com.android.tools.lint.client.api.UElementVisitor$DelegatingPsiVisitor.visitCallExpression(UElementVisitor.kt:1062)
        at org.jetbrains.uast.UCallExpression$DefaultImpls.accept(UCallExpression.kt:85)
        at org.jetbrains.uast.UCallExpressionEx$DefaultImpls.accept(UCallExpression.kt)

Thanks