关于android：无法解析符号\\’MediaSessionCompat \\’

Cannot resolve symbol 'MediaSessionCompat'

我无法导入MediaSessionCompat。
用于导入整个android.support.v4.media库的import语句未显示在Android Studio" IntelliSense"中，并且无法解析其中的任何符号。

我是否需要进行某种额外的配置才能实现此导入，例如在应用程序build.gradle中？

将这些添加到您的依赖项并同步Gradle：

AndroidX之前的版本

1 2	implementation"com.android.support:support-compat:28.0.0" implementation"com.android.support:support-media-compat:28.0.0"

后AndroidX

1 2	implementation 'androidx.core:core:1.3.1' implementation 'androidx.media:media:1.2.0'

官方文档中的注释：

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.