Answers for "install another sdk in my android studio"

install android sdk

Android SDK is bundled with Android Studio
(this is the easiest way to install and use the SDK)
https://developer.android.com/studio

Or you can install it seperately
https://developer.android.com/studio#command-tools

set android sdk directory from android studio

#SDK exporting - this will solve your issue
export ANDROID_HOME=/home/{user}/Android/Sdk 

#Tools exporting - it can be need in your case
export PATH=/home/{user}/Android/Sdk/platform-tools:$PATH
export PATH=/home/{user}/Android/Sdk/tools:$PATH
export PATH=/home/{user}/Android/ndk-build:$PATH

#Flutter binary exporting
export PATH=/home/{user}/flutter/bin:$PATH