问题
I read the answers "unable to locate adb" using Android Studio and Error:Unable to locate adb within SDK in Android Studio and it didn't solve my problem.
I use the 4.0 android-studio and Ubuntu 18.04
When I click on "launch this AVD in the emulator", I get an error message "Unable to locate adb". I did look in the Android/Sdk/platform-tools, I have an "adb" executable.
After the "unable to locate adb" error message, the AVD still launches. But, when I try to run my react native app on it, I get the error
error Failed to install the app. Make sure you have the Android development environment set up: https://facebook.github.io/react-native/docs/getting-started.html#android-development-environment. Run CLI with --verbose flag for more details. Error: Command failed: ./gradlew app:installDebug -PreactNativeDevServerPort=8081
I'm pretty sure the react-native part is fine, but that route to the emulator is not the same as before.
It was working before. Yesterday, out of the blue, when I launched my android-studio, it "restarted" (showing me the install wizard, etc), and it seems it messed up its configuration.
EDIT: [bad way] I created a new ubuntu user, re-install android studio + react-native. I still get the error message, still the AVD launches, but now React-native can install the app on it. So, now I can work with my new user, but I did not fix the problem.
EDIT2: [good way] @jpatmore fixed the android-studio part (see his answer). The react-native was still not working. There was probably some parameter of android-studio 3.6 still in the [my project]/android/[gradle or something] I cloned my repo in another folder, do another "npm install", "react-native link", and it was working.
回答1:
I started getting this error after updating Android Studio from version 3.6.3 to 4.0. It didn't stop the emulator working, but it was vaguely annoying.
I checked that adb.exe was in the folder C:\Users[username]\AppData\Local\Android\Sdk\platform-tools. I also ran it in a command-line to prove that the exe worked OK.
Finally after a bit of a struggle I found a solution:
Start the SDK Manager, File menu -> Settings -> Appearance & Behavior -> System Settings -> Android SDK, SDK Tools tab (Or click the cube with blue down arrow icon in the toolbar).
Firstly I updated the Android SDK Platform-Tools (now v30.0.2). This didn't fix the problem. I also tried manually deleting the platform tools folder and reinstalling.
Eventually I decided to click the "Edit" link next to the "Android SDK Location" box. This opens a new dialog for SDK Components Setup. How well hidden is that?!?! I had always assumed it was to edit the SDK path!
You should now see that Android SDK - (installed) has a tick in the checkbox, as do any SDK Platforms you have. Click on the Next button and your SDK will update. Problem solved.
HTH
回答2:
A couple of days after posting the above solution, the problem returned on my Windows system.
Finally after several hours of investigation I think I have another solution for everyone having issues with AVD Manager "Unable to locate adb".
I know we have the setting for the SDK in File -> Settings -> Appearance & Behavior -> System Settings -> Android SDK. This it seems is not enough! It appears that Android Studio (at least the new version 4) does not give projects a default SDK, despite the above setting.
So, you also (for each project) need to go to File -> Project Structure -> Project Settings -> Project, and select the Project SDK, which is set to [No SDK] by default.
If there's nothing in the drop-down box, then select New, select Android SDK, and navigate to your Android SDK location (normally C:\Users[username]\AppData\Local\Android\Sdk on Windows). You will then be able to select the Android API xx Platform. You now should not get this annoying adb error.
HTH
来源：https://stackoverflow.com/questions/62129354/android-studio-unable-to-locate-adb