(#) Missing `PendingIntent` mutability flag !!! ERROR: Missing `PendingIntent` mutability flag This is an error, and is also enforced at build time when supported by the build system. For Android this means it will run during release builds. Id : `UnspecifiedImmutableFlag` Summary : Missing `PendingIntent` mutability flag Severity : Fatal Category : Security Platform : Android Vendor : Android Open Source Project Feedback : https://issuetracker.google.com/issues/new?component=192708 Since : 4.3.0-alpha01 (December 2020) Affects : Kotlin and Java files Editing : This check runs on the fly in the IDE editor See : https://developer.android.com/about/versions/12/behavior-changes-12#pending-intent-mutability See : https://goo.gle/UnspecifiedImmutableFlag 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/PendingIntentMutableFlagDetector.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/PendingIntentMutableFlagDetectorTest.kt) Apps targeting Android 12 and higher must specify either `FLAG_IMMUTABLE` or `FLAG_MUTABLE` when constructing a `PendingIntent`. `FLAG_IMMUTABLE` is available since target SDK 23, and is almost always the best choice. See https://developer.android.com/guide/components/intents-filters#CreateImmutablePendingIntents for a list of common exceptions to this rule. !!! 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 src/test/pkg/PendingIntentTest.java:7:Error: Missing PendingIntent mutability flag [UnspecifiedImmutableFlag] PendingIntent.getActivity(null, 0, null, 0); - src/test/pkg/PendingIntentTest.java:8:Error: Missing PendingIntent mutability flag [UnspecifiedImmutableFlag] PendingIntent.getActivities(null, 0, null, 0); - ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here is the source file referenced above: `src/test/pkg/PendingIntentTest.java`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers package test.pkg; import android.app.PendingIntent; public class PendingIntentTest { protected void test() { PendingIntent.getActivity(null, 0, null, 0); PendingIntent.getActivities(null, 0, null, 0); } } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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/PendingIntentMutableFlagDetectorTest.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, `PendingIntentMutableFlagDetector.testNoFlag`. 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 annotation like this on the enclosing element: ```kt // Kotlin @Suppress("UnspecifiedImmutableFlag") fun method() { getActivity(...) } ``` or ```java // Java @SuppressWarnings("UnspecifiedImmutableFlag") void method() { getActivity(...); } ``` * Using a suppression comment like this on the line above: ```kt //noinspection UnspecifiedImmutableFlag 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="UnspecifiedImmutableFlag" 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 'UnspecifiedImmutableFlag' } ``` In Android projects this should be nested inside an `android { }` block. * For manual invocations of `lint`, using the `--ignore` flag: ``` $ lint --ignore UnspecifiedImmutableFlag ...` ``` * Last, but not least, using baselines, as discussed [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).