(#) Android App links should only use http(s) schemes !!! ERROR: Android App links should only use http(s) schemes This is an error. Id : `AppLinkSplitToWebAndCustom` Summary : Android App links should only use http(s) schemes Severity : Error Category : Correctness Platform : Android Vendor : Android Open Source Project Feedback : https://issuetracker.google.com/issues/new?component=192708 Since : 8.8.0 (January 2025) Affects : Manifest files Editing : This check runs on the fly in the IDE editor See : https://developer.android.com/training/app-links/verify-android-applinks#add-intent-filters 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/AppLinksValidDetector.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/AppLinksValidDetectorTest.kt) In order for Android App Links to open in your app, Android must perform domain verification. However, Android only sends domain verification requests for ``s that only contain http(s) schemes. To ensure correct behavior, please split your http(s) schemes and other schemes into two different ``s. !!! 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 AndroidManifest.xml:7:Error: Split your http(s) and custom schemes into separate intent filters [AppLinkSplitToWebAndCustom] <intent-filter android:autoVerify="true" android:order="-1" android:priority="-1"> ------------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here are the relevant source files: `AndroidManifest.xml`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.helloworld" > <uses-sdk android:minSdkVersion="31" android:targetSdkVersion="34" /> <application> <activity android:name=".SplitWebAndCustomActivity" android:exported="true"> <intent-filter android:autoVerify="true" android:order="-1" android:priority="-1"> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <uri-relative-filter-group> <data android:path="/path" /> <data android:query="queryparam=value" /> </uri-relative-filter-group> <data android:scheme="http" /> <data android:scheme="custom" /> <data android:host="example.com" /> <data android:path="@string/path" /> <data android:path="/<&''" /> <data android:path='/single"quote' /> <data android:path="" /> <!-- Test having tags underneath the host elements as well --> <action android:name="android.intent.action.SEND"/> <uri-relative-filter-group> <data android:path="/path" /> <data android:query="queryparam=value" /> </uri-relative-filter-group> </intent-filter> </activity> </application> </manifest> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ `res/values/strings.xml`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers <resources> <string name="path">/path</string> </resources> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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/AppLinksValidDetectorTest.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, `AppLinksValidDetector.test_splitToWebAndCustomSchemes`. 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="AppLinkSplitToWebAndCustom"` 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"> ... <activity tools:ignore="AppLinkSplitToWebAndCustom" .../> ... </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="AppLinkSplitToWebAndCustom" 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 'AppLinkSplitToWebAndCustom' } ``` In Android projects this should be nested inside an `android { }` block. * For manual invocations of `lint`, using the `--ignore` flag: ``` $ lint --ignore AppLinkSplitToWebAndCustom ...` ``` * Last, but not least, using baselines, as discussed [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).