(#) KTX Extension Available !!! Tip: KTX Extension Available Advice from this check is just a hint; it's "weak" warning. Id : `KtxExtensionAvailable` Summary : KTX Extension Available Severity : Hint Category : Productivity Platform : Android Vendor : Android Open Source Project Feedback : https://issuetracker.google.com/issues/new?component=192708 Since : 4.1.0 (October 2020) Affects : Gradle build files Editing : This check runs on the fly in the IDE editor See : https://developer.android.com/kotlin/ktx Implementation : [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/GradleDetector.kt) Tests : [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/GradleDetectorTest.kt) Android KTX extensions augment some libraries with support for modern Kotlin language features like extension functions, extension properties, lambdas, named parameters, coroutines, and more. In Kotlin projects, use the KTX version of a library by replacing the dependency in your `build.gradle` file. For example, you can replace `androidx.fragment:fragment` with `androidx.fragment:fragment-ktx`. !!! Tip This lint check has an associated quickfix available in the IDE. (##) Example Here is an example of lint warnings produced by this check: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text build.gradle:7:Hint: Add suffix -ktx to enable the Kotlin extensions for this library [KtxExtensionAvailable] implementation "androidx.core:core:1.2.0" -------------------------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here is the source file referenced above: `build.gradle`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~groovy linenumbers plugins { id 'com.android.application' id 'kotlin-android' } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:1.0.0" implementation "androidx.core:core:1.2.0" implementation "androidx.core:core:999.2.0" // No KTX extensions for this version. implementation "androidx.core:fake-artifact:1.2.0" // No KTX extensions for this artifact. } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ You can also visit the [source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/GradleDetectorTest.kt) for the unit tests for this check to see additional scenarios. The above example was automatically extracted from the first unit test found for this lint check, `GradleDetector.testKtxExtensions`. To report a problem with this extracted sample, visit https://issuetracker.google.com/issues/new?component=192708. (##) Suppressing You can suppress false positives using one of the following mechanisms: * Using a suppression comment like this on the line above: ```kt //noinspection KtxExtensionAvailable problematicStatement() ``` * Using a special `lint.xml` file in the source tree which turns off the check in that folder and any sub folder. A simple file might look like this: ```xml <?xml version="1.0" encoding="UTF-8"?> <lint> <issue id="KtxExtensionAvailable" severity="ignore" /> </lint> ``` Instead of `ignore` you can also change the severity here, for example from `error` to `warning`. You can find additional documentation on how to filter issues by path, regular expression and so on [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html). * In Gradle projects, using the DSL syntax to configure lint. For example, you can use something like ```gradle lintOptions { disable 'KtxExtensionAvailable' } ``` In Android projects this should be nested inside an `android { }` block. * For manual invocations of `lint`, using the `--ignore` flag: ``` $ lint --ignore KtxExtensionAvailable ...` ``` * Last, but not least, using baselines, as discussed [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).