not finding android sdk (Unity)

Error:

Invalid command android
UnityEditor.HostView:OnGUI()

CommandInvokationFailure:

Unable to list target platforms. Please make sure the android sdk path is correct. See the Console for more details. 
C:/Program Files/Java/jdk1.8.0_121\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="C:/Users/great/AppData/Local/Android/Sdk\tools" -Dfile.encoding=UTF8 -jar "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -

stderr[
Error:Invalid command android
]
stdout[

]
exit code: 64
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommandInternal (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommandSafe (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.HostView:OnGUI()

Error building Player:

CommandInvokationFailure: Unable to list target platforms. Please make sure the android sdk path is correct. See the Console for more details. 
C:/Program Files/Java/jdk1.8.0_121\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="C:/Users/great/AppData/Local/Android/Sdk\tools" -Dfile.encoding=UTF8 -jar "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -

stderr[
Error:Invalid command android
]
stdout[

]
exit code: 64

Screenshot:

I have same problem.

I fixed by android sdk tool version downgrade.

The steps.

1. Delete android sdk "tools" folder : [Your Android SDK root]/tools -> tools

2. Download SDK Tools: http://dl-ssl.google.com/android/repository/tools_r25.2.5-windows.zip

3. Extract that to Android SDK root

4. Build your project

The issue is due to incompatibility of unity with latest Android build tools. For MacOS here's a one liner that will get it working for you:

cd $ANDROID_HOME; rm -rf tools; wget http://dl-ssl.google.com/android/repository/tools_r25.2.5-ma‌​cosx.zip; unzip tools_r25.2.5-macosx.zip

1- Just open https://developer.android.com/studio/index.html

2- scroll down to the bottom of that page

3- download last version of tools for your OS (for example tools_r25.2.3-windows.zip)

4- Unzip it

5- Delete folder tools from previous Android Sdk folder

6- Copy new folder tools to Android SDK Folder like this image:

Unity 5.6.1 / 2017.1 fixes the Android SDK Tools 25.3.1+ compatibility issue. This is noted in Unity bug tracker under issue 888859 and their 5.6.1 release notes.

These are the steps that eventually worked for me...

• Install JDK jdk1.8.0_131 (yes, this specific version, not a later version) and set it as the JDK Path in Unity.

• Delete android sdk tools folder : [android_sdk_root]/tools

• Download SDK Tools v25.2.5 (this specific version) from http://dl-ssl.google.com/android/repository/tools_r25.2.5-windows.zip

• Extract the tools folder in that archive to Android SDK root

• Build your project

For Mac OS Users :

Go to your Android SDK folder and delete the tools folder (I recommend you to make a copy before deleting it, in case this solution does not solve the problem for you)

Then download the tools folder here :

http://dl-ssl.google.com/android/repository/tools_r25.2.5-macosx.zip

You can find all tools zip version here :

https://androidsdkoffline.blogspot.fr/p/android-sdk-build-tools.html

Then unzip the download file and place it in the Android sdk folder.

Hope it helps

Easier solution: set the environment variable USE_SDK_WRAPPER=1, or hack tools/android.bat to add the line "set USE_SDK_WRAPPER=1". This prevents android.bat from popping up a "y/n" prompt, which is what's confusing Unity.

1. Delete android sdk "tools" folder : [Your Android SDK root]/tools -> tools

2. Download SDK Tools: http://dl-ssl.google.com/android/repository/tools_r25.2.5-windows.zip

3. Extract that to Android SDK root

4. Build your project

After that it didn't work for me yet, I had to

5. Go to the Java archives (http://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html)

6. Search for the jdk-8u131 release.

7. Accept the Licence Agreement,make an account and download the release.

8. Install it and define it as JDK path in Unity.

source : https://www.reddit.com/r/Unity3D/comments/77azfb/i_cant_get_unity_to_build_run_my_game/

I solved the problem by uninstalling JDK 9.

Linux Users:

cp -r Android AndroidUnity
cd AndroidUnity/Sdk
rm -rf tools
wget http://dl-ssl.google.com/android/repository/tools_r25.2.5-windows.zip
unzip tools_r25.2.5-windows.zip

In Unity preferences change to this newly created sdk folder.

In my case, I was trying to build and get APK for an old Unity 3D project (so that I can play the game in my Android phone). I was using the most recent Android Studio version, and all the SDK packages I could download via SDK Manager in Android Studio. SDK Packages was located in

C:/Users/Onat/AppData/Local/Android/Sdk And the error message I got was the same except the JDK (Java Development Kit) version "jdk-12.0.2" . JDK was located in

C:\Program Files\Java\jdk-12.0.2 And Environment Variable in Windows was JAVA_HOME : C:\Program Files\Java\jdk-12.0.2

After 3 hours of research, I found out that Unity does not support JDK 10. As told in https://forum.unity.com/threads/gradle-build-failed-error-could-not-determine-java-version-from-10-0-1.532169/ . My suggestion is:

1.Uninstall unwanted JDK if you have one installed already. https://www.java.com/tr/download/help/uninstall_java.xml

2.Head to http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

3.Login to/Open a Oracle account if not already logged in.

4.Download the older but functional JDK 8 for your computer set-up(32 bit/64 bit, Windows/Linux etc.)

5.Install the JDK. Remember the installation path. (https://docs.oracle.com/cd/E19182-01/820-7851/inst_cli_jdk_javahome_t/)

6.If you are using Windows, Open Environment Variables and change Java Path via Right click My Computer/This PC>Properties>Advanced System Settings>Environment Variables>New>Variable Name: JAVA_HOME>Variable Value: [YOUR JDK Path, Mine was "C:\Program Files\Java\jdk1.8.0_221"]

7.In Unity 3D, press Edit > Preferences > External Tools and fill in the JDK path (Mine was "C:\Program Files\Java\jdk1.8.0_221").

8.Also, in the same pop-up, edit SDK Path. (Get it from Android Studio > SDK Manager > Android SDK > Android SDK Location.)

9.If needed, restart your computer for changes to take effect.