(#) Mixing screenOrientation and translucency !!! WARNING: Mixing screenOrientation and translucency This is a warning. Id : `TranslucentOrientation` Summary : Mixing screenOrientation and translucency Severity : Warning Category : Correctness Platform : Android Vendor : Android Open Source Project Feedback : https://issuetracker.google.com/issues/new?component=192708 Since : 3.2.0 (September 2018) Affects : Kotlin and Java files, manifest files and resource files Editing : This check can *not* run live 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/TranslucentViewDetector.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/TranslucentViewDetectorTest.kt) Specifying a fixed screen orientation with a translucent theme isn't supported on apps with `targetSdkVersion` O or greater since there can be an another activity visible behind your activity with a conflicting request. For example, your activity requests landscape and the visible activity behind your translucent activity request portrait. In this case the system can only honor one of the requests and currently prefers to honor the request from non-translucent activities since there is nothing visible behind them. Devices running platform version O or greater will throw an exception in your app if this state is detected. (##) Example Here is an example of lint warnings produced by this check: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text res/values/styles.xml:7:Warning: Should not specify screen orientation with translucent or floating theme [TranslucentOrientation] <item name="android:windowIsFloating">true</item> ------------------------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here are the relevant source files: `src/AndroidManifest.xml`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="test.pkg"> <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="26" /> <application android:icon="@mipmap/ic_launcher" android:label="@string/app_name"> <activity android:name=".MainActivity" android:screenOrientation="landscape" android:theme="@style/AppTheme" /> </application> </manifest> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ `res/values/styles.xml`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers <resources> <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"> <item name="colorPrimary">@color/colorPrimary</item> <item name="colorPrimaryDark">@color/colorPrimaryDark</item> <item name="colorAccent">@color/colorAccent</item> <item name="android:windowIsFloating">true</item> <item name="android:windowIsTranslucent">true</item> </style> <style name="SubTheme" parent="AppTheme"> </style> </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/TranslucentViewDetectorTest.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, `TranslucentViewDetector.testThemeInActivityManifest`. 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="TranslucentOrientation"` 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"> ... <style screenOrientation="..." tools:ignore="TranslucentOrientation" .../> ... </manifest> ``` * Using a suppression annotation like this on the enclosing element: ```kt // Kotlin @Suppress("TranslucentOrientation") fun method() { setTheme(...) } ``` or ```java // Java @SuppressWarnings("TranslucentOrientation") void method() { setTheme(...); } ``` * Using a suppression comment like this on the line above: ```kt //noinspection TranslucentOrientation 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="TranslucentOrientation" 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 'TranslucentOrientation' } ``` In Android projects this should be nested inside an `android { }` block. * For manual invocations of `lint`, using the `--ignore` flag: ``` $ lint --ignore TranslucentOrientation ...` ``` * Last, but not least, using baselines, as discussed [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).