title: android studio platform-tools missing adb.exe
body: <p>Today, I clicked some update when I launch Android Stodio. I forgot what it is. Then, I run some code when there is a error 
  "8:34 PM    IllegalArgumentException: Unable to locate adb"</p>
  
  <p>Then, I google for few hours and still cannot solve my problem. And I found that there is no "adb.exe" under my platform-tools folder.</p>
  
  <p>Can someone help?</p>
  
  <p>my os is Window 10.
  I have tried uninstall Android Studio and install it back. It doesn't help.</p>
  
  <p>Edit 1: After I re-install the platform-tools, I get back the adb.exe.But, I run my program again, it does the "ADB initialization", my adb.exe file lose again.</p>