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Android Build an Interactive Story App (Retired) User Input Introducing ImageViews

Can't Test App

So whenever I try to click Run to run my app, it always say "Unable to locate adb", and my app never shows up on the emulator. What's going on?

Your first knee-jerk reaction to any error message should be to just Google it and see if others are having the same problem and what their solution is. For instance: https://stackoverflow.com/questions/27301960/errorunable-to-locate-adb-within-sdk-in-android-studio