1：Unknown AVD name, use -list-avds to see valid list.
下午1:26 Emulator: emulator: ERROR: Unknown AVD name [Pixel_2_API_26], use -list-avds to see valid list.
下午1:26 Emulator: Process finished with exit code 1
解决办法：
I experienced the same issue, regardless of the AVD. I'm too new to understand why, but it seems that Android Studio created /.android/avd directories in two locations:
/root/.android/avd/home/USERNAME/.android/avd
The .avd and .ini created when creating a new AVD were stored in the 1st location, and the 2nd location was empty. To resolve it, I copied and pasted both the .avd and .ini files for each AVD from 1 to 2 (they needed to be in both in order for AS to see and run the AVD). The emulator then ran successfully.
https://stackoverflow.com/questions/48996437/process-finished-with-exit-code-1-unknown-avd-name
2:循环依FAILURE: Build failed with an exception.
* What went wrong: Circular dependency between the following tasks: :app:checkManifestChangesDebug \--- :app:instantRunMainApkResourcesDebug \--- :app:transformClassesAndDexWithShrinkResForDebug \--- :app:transformDexArchiveWithDexMergerForDebug +--- :app:preColdswapDebug | \--- :app:incrementalDebugTasks | +--- :app:transformClassesAndClassesEnhancedWithInstantReloadDexForDebug | | \--- :app:transformClassesWithInstantRunForDebug | | \--- :app:checkManifestChangesDebug (*) | \--- :app:transformClassesWithInstantRunForDebug (*) \--- :app:transformClassesWithDexBuilderForDebug +--- :app:preColdswapDebug (*) \--- :app:transformClassesWithInstantRunForDebug (*) (*) - details omitted (listed previously)
解决办法：
Disable instant run from settings
Settings > search for instant run > uncheck "Enable Instant Run to hot swap code/resource changes on display"
https://stackoverflow.com/questions/52779618/circular-dependency-between-the-following-tasks-in-gradle/53582242