问题
I cannot import MediaSessionCompat.
The import statement for importing the whole android.support.v4.media library does not show up in the Android Studio "IntelliSense" and it cannot resolve the symbol for anything inside it.
Do I have to make some kind of extra configuration to get this import, like in app build.gradle?
回答1:
Add these to your dependencies and sync Gradle:
Pre-AndroidX
implementation "com.android.support:support-compat:28.0.0"
implementation "com.android.support:support-media-compat:28.0.0"
Post-AndroidX
implementation 'androidx.core:core:1.1.0'
implementation 'androidx.media:media:1.1.0'
Note from official documentation:
With the release of Android 9.0 (API level 28) there is a new version of the support library called AndroidX which is part of Jetpack. The AndroidX library contains the existing support library and also includes the latest Jetpack components. You can continue to use the support library. Historical artifacts (those versioned 27 and earlier, and packaged as android.support.*) will remain available on Google Maven. However, all new library development will occur in the AndroidX library. We recommend using the AndroidX libraries in all new projects. You should also consider migrating existing projects to AndroidX as well.
回答2:
The latest dependencies are:
implementation 'androidx.core:core:1.1.0'
implementation 'androidx.media:media:1.1.0'
来源：https://stackoverflow.com/questions/52019841/cannot-resolve-symbol-mediasessioncompat