adb is not available from command prompt (with correct path set). I think something failed in the original installation of the platform-tools. Studio is telling me to update but this happens every time:
it looks like adb.exe is missing from my machine
this is the android studio event log:
delete platform-tools from this location C:\Users\\AppData\Local\Android\Sdk
Then restart Android Studio. After gradle build finish it will ask for installation of missing tools. just click there. It should work fine.
i had the same problem the adb.exe was deleted i downloaded the adb shell from http://adbshell.com/downloads
and extracted the adb.exe in the android sdk location "AppData\Local\Android\sdk\platform-tools"
I had the same problem. My adb.exe has been deleted by my antivirus software. adb.exe couldn't be started and therefore couldn't be stopped. All i had to do to fix this problem was to restore the file with my antivirus software.I hope this helps future Viewers.
I was unable to repair the installation so I just completely uninstalled Android Studio and deleted ~/AppData/Local/Android folder. Then I reinstalled Android Studio and the necessary SDKs.
I believe my original installation failed and was missing parts (like adb) and this was causing the update to fail as well.
I had the same problem when I overwrite android studio directory (in Program Files) with new version and try to update the SDK.
I deleted the old version of android studio, replaced the entire directory with new version and unzip works.
