(#) Missing density folder !!! WARNING: Missing density folder This is a warning. Id : `IconMissingDensityFolder` Summary : Missing density folder Severity : Warning Category : Usability: Icons Platform : Android Vendor : Android Open Source Project Feedback : https://issuetracker.google.com/issues/new?component=192708 Since : Initial Affects : Resource files Editing : This check can *not* run live in the IDE editor See : https://developer.android.com/guide/practices/screens_support.html 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/IconDetector.java) 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/IconDetectorTest.java) Copyright Year : 2011 Icons will look best if a custom version is provided for each of the major screen density classes (low, medium, high, extra-high, extra-extra-high). This lint check identifies folders which are missing, such as `drawable-hdpi`. Low density is not really used much anymore, so this check ignores the ldpi density. To force lint to include it, set the environment variable `ANDROID_LINT_INCLUDE_LDPI=true`. For more information on current density usage, see https://developer.android.com/about/dashboards. (##) Example Here is an example of lint warnings produced by this check: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text res/drawable-nodpi/frame.xml:Warning: Missing density variation folders in res: drawable-hdpi, drawable-xhdpi, drawable-xxhdpi [IconMissingDensityFolder] 0 errors, 3 warnings ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here is the source file referenced above: `res/drawable-nodpi/frame.xml`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:color="#ff000000"/> <!-- WRONG, SHOULD BE LAST --> <item android:state_pressed="true" android:color="#ffff0000"/> <!-- pressed --> <item android:state_focused="true" android:color="#ff0000ff"/> <!-- focused --> </selector> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ You can also visit the source code ([IconDetectorTest.java](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/IconDetectorTest.java) [LintBaselineTest.kt](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/client/api/LintBaselineTest.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, `IconDetector.testNoDpiMix`. 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 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="IconMissingDensityFolder" 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 'IconMissingDensityFolder' } ``` In Android projects this should be nested inside an `android { }` block. * For manual invocations of `lint`, using the `--ignore` flag: ``` $ lint --ignore IconMissingDensityFolder ...` ``` * Last, but not least, using baselines, as discussed [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).