(#) Use Mipmap Launcher Icons !!! WARNING: Use Mipmap Launcher Icons This is a warning. Id : `MipmapIcons` Summary : Use Mipmap Launcher Icons Severity : Warning Category : Usability: Icons Platform : Android Vendor : Android Open Source Project Feedback : https://issuetracker.google.com/issues/new?component=192708 Since : 1.1.0 (February 2015) Affects : Manifest files Editing : This check runs on the fly in the IDE editor 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/ManifestDetector.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/ManifestDetectorTest.kt) Launcher icons should be provided in the `mipmap` resource directory. This is the same as the `drawable` resource directory, except resources in the `mipmap` directory will not get stripped out when creating density-specific APKs. In certain cases, the Launcher app may use a higher resolution asset (than would normally be computed for the device) to display large app shortcuts. If drawables for densities other than the device's resolution have been stripped out, then the app shortcut could appear blurry. To fix this, move your launcher icons from `drawable-`dpi to `mipmap-`dpi and change references from @drawable/ and R.drawable to @mipmap/ and R.mipmap. In Android Studio this lint warning has a quickfix to perform this automatically. !!! 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/main/AndroidManifest.xml:8:Warning: Should use @mipmap instead of @drawable for launcher icons [MipmapIcons] android:icon="@drawable/ic_launcher" ------------------------------------ src/main/AndroidManifest.xml:13:Warning: Should use @mipmap instead of @drawable for launcher icons [MipmapIcons] android:icon="@drawable/activity1" ---------------------------------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here are the relevant source files: `src/main/AndroidManifest.xml`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="test.mipmap" android:versionCode="1" android:versionName="1.0" > <!-- Wrong icon resource type --> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <!-- Wrong icon resource type --> <activity android:name=".Activity1" android:icon="@drawable/activity1" android:label="@string/activity1" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <!-- Already a @mipmap resource --> <activity android:name=".Activity2" android:icon="@mipmap/activity2" android:label="@string/activity2" > </activity> <!-- Not a launchable activity --> <activity android:name=".Activity3" android:icon="@drawable/activity3" android:label="@string/activity3" > </activity> </application> </manifest> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ `build.gradle`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~groovy linenumbers android { defaultConfig { resConfigs "cs" } flavorDimensions "pricing", "releaseType" productFlavors { beta { dimension "releaseType" resConfig "en", "de" resConfigs "nodpi", "hdpi" } normal { dimension "releaseType" } free { dimension "pricing" } paid { dimension "pricing" } } } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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/ManifestDetectorTest.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, `ManifestDetector.testMipMapWithDensityFiltering`. 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: * Adding the suppression attribute `tools:ignore="MipmapIcons"` on the problematic XML element (or one of its enclosing elements). You may also need to add the following namespace declaration on the root element in the XML file if it's not already there: `xmlns:tools="http://schemas.android.com/tools"`. ```xml <?xml version="1.0" encoding="UTF-8"?> <manifest xmlns:tools="http://schemas.android.com/tools"> ... <application tools:ignore="MipmapIcons" .../> ... </manifest> ``` * 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="MipmapIcons" 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 'MipmapIcons' } ``` In Android projects this should be nested inside an `android { }` block. * For manual invocations of `lint`, using the `--ignore` flag: ``` $ lint --ignore MipmapIcons ...` ``` * Last, but not least, using baselines, as discussed [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).