E/CameraX: No default CameraXConfig.Provider specified in meta-data. The most likely cause is you did not include a default implementation in your build such as 'camera-camera2'. D/AndroidRuntime: Shutting down VM E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.mycamerax, PID: 7966 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mycamerax/com.example.mycamerax.MainActivity}: java.lang.IllegalStateException: CameraX is not configured properly. The most likely cause is you did not include a default implementation in your build such as 'camera-camera2'. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)

这个错误提示是因为你没有在 AndroidManifest.xml 文件中的 meta-data 标签中指定 CameraXConfig.Provider，导致 CameraX 没有被正确配置。解决方法是在 AndroidManifest.xml 文件中的 meta-data 标签里指定 CameraXConfig.Provider，例如：

<meta-data
    android:name="androidx.camera.camera2.extension.Camera2Extension"
    android:resource="@xml/camera2_extension_config" />

其中，android:name 指定了 CameraXConfig.Provider 的实现类，android:resource 指定了该实现类的配置文件。你需要根据你的实际情况来配置它们。同时，确保你的 build.gradle 文件中已经添加了 CameraX 的依赖。