(#) Missing Disposable handling: Apply AutoDispose or cache the Disposable instance manually and enable lenient mode !!! ERROR: Missing Disposable handling: Apply AutoDispose or cache the Disposable instance manually and enable lenient mode This is an error. Id : `AutoDispose` Summary : Missing Disposable handling: Apply AutoDispose or cache the Disposable instance manually and enable lenient mode Severity : Error Category : Correctness Platform : Any Vendor : Uber Identifier : AutoDispose Feedback : https://github.com/uber/AutoDispose/issues Min : Lint 8.0 and 8.1 Compiled : Lint 8.0 and 8.1 Artifact : [com.uber.autodispose2:autodispose-lint](com_uber_autodispose2_autodispose-lint.md.html) Since : 2.1.0 Affects : Kotlin and Java files and test sources Editing : This check runs on the fly in the IDE editor Implementation : [Source Code](https://github.com/uber/AutoDispose/tree/main/static-analysis/autodispose-lint/src/main/kotlin/autodispose2/lint/AutoDisposeDetector.kt) Tests : [Source Code](https://github.com/uber/AutoDispose/tree/main/static-analysis/autodispose-lint/src/test/kotlin/autodispose2/lint/AutoDisposeDetectorTest.kt) Copyright Year : 2019 You're subscribing to an observable but not handling its subscription. This can result in memory leaks. You can avoid memory leaks by appending `.as(autoDisposable(this))` before you subscribe or cache the Disposable instance manually and enable lenient mode. More: https://github.com/uber/AutoDispose/wiki/Lint-Check. (##) Example Here is an example of lint warnings produced by this check: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text src/foo/ExampleClass.java:8:Error: Missing Disposable handling: Apply AutoDispose or cache the Disposable instance manually and enable lenient mode. [AutoDispose] obs.subscribe(); --------------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here is the source file referenced above: `src/foo/ExampleClass.java`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers package foo; import io.reactivex.rxjava3.core.Observable; import androidx.fragment.app.Fragment; class ExampleClass extends Fragment { void names() { Observable obs = Observable.just(1, 2, 3, 4); obs.subscribe(); } } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ You can also visit the [source code](https://github.com/uber/AutoDispose/tree/main/static-analysis/autodispose-lint/src/test/kotlin/autodispose2/lint/AutoDisposeDetectorTest.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, `AutoDisposeDetector.observableErrorsOutOnOmittingAutoDispose`. To report a problem with this extracted sample, visit https://github.com/uber/AutoDispose/issues. (##) Including !!! This is not a built-in check. To include it, add the below dependency to your project. This lint check is included in the lint documentation, but the Android team may or may not agree with its recommendations. ``` // build.gradle.kts lintChecks("com.uber.autodispose2:autodispose-lint:2.2.1") // build.gradle lintChecks 'com.uber.autodispose2:autodispose-lint:2.2.1' // build.gradle.kts with version catalogs: lintChecks(libs.autodispose.lint) # libs.versions.toml [versions] autodispose-lint = "2.2.1" [libraries] # For clarity and text wrapping purposes the following declaration is # shown split up across lines, but in TOML it needs to be on a single # line (see https://github.com/toml-lang/toml/issues/516) so adjust # when pasting into libs.versions.toml: autodispose-lint = { module = "com.uber.autodispose2:autodispose-lint", version.ref = "autodispose-lint" } ``` 2.2.1 is the version this documentation was generated from; there may be newer versions available. [Additional details about com.uber.autodispose2:autodispose-lint](com_uber_autodispose2_autodispose-lint.md.html). (##) Suppressing You can suppress false positives using one of the following mechanisms: * Using a suppression annotation like this on the enclosing element: ```kt // Kotlin @Suppress("AutoDispose") fun method() { subscribe(...) } ``` or ```java // Java @SuppressWarnings("AutoDispose") void method() { subscribe(...); } ``` * Using a suppression comment like this on the line above: ```kt //noinspection AutoDispose 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="AutoDispose" 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 'AutoDispose' } ``` In Android projects this should be nested inside an `android { }` block. * For manual invocations of `lint`, using the `--ignore` flag: ``` $ lint --ignore AutoDispose ...` ``` * Last, but not least, using baselines, as discussed [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).