text: Hi. I'm totally new on Android. I downloaded and installed Android 3.1.3 and try to run the first app. Pre Phone and Tablet API 28: Android, Basic Activity, Nexus 5X API27, Android 8.1 (Google Play), and I still report this error: "Unable to locate adb". Can you please advise me how to go? Well thank you.
  Open the "Standalone SDK manager" and uninstall the Android SDK platform-tools, delete the [your sdk directory]/platform-tools directory completely and install it again using the SDK manager.
  The resource @string/appbar_scrolling_view_behavior is marked as private in com.android.support:design Private resources should not be referenced; the may not be present everywhere, and even where they are they may disappear without notice. To fix this, copy the resource into your own project instead.
  In "C: \ Users \ User \ AppData \ Local \ Android \ Sdk \ platform-tools" folder was missing adb.exe. One I got from developer.android.com/studio/releases/platform-tools#download "SDK Platform-Tool for Windows" I've copied and pasted adb.exe, AdbWinApi.dll, AdbWinUsbApi.dll. And app runs perfectly.
  Just missing some executable files in SDK folder rarely happened. Maybe they were moved by accident. Any way, you have fixed the issue by yourself and you can continue your Android exercise now.
  Btw, excuse me, it will be appreciated if you would like to refer to my exercise app on Google Play. It's great if you would like to leave a 5-star rating. Thank you in advance.
  Do you have in direct "C: \ Users \ User \ AppData \ Local \ Android \ Sdk \ platform-tools" adb.exe?