How to Build a 'Release' APK in Android Studio

How to build signed apk from Android Studio for Flutter

You can build the Apk/AppBundle using IDE and command line.

• Building APK/AppBundle through IDE:

  Step-1

  In Android Studio's tab bar, click on Tools and then Flutter and then Open Android module in Android Studio:

  

  Step-2

  Open Project it in New Window:

  

  Step-3

  Having opened the project, click on Build and then Generate Signed Bundle / APK ...

  

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• Building APK/AppBundle through command:

  Step-1:

  Modify your build.gradle(app) file and include your key information there:

  android {
      compileSdkVersion 31
      signingConfigs {
          release {
              storeFile file("<path-to-keys.jks>")
              storePassword "********"
              keyAlias "<key-alias>"
              keyPassword "********"
          }
      }
      buildTypes {
          release {
              signingConfig signingConfigs.release
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  

  Step-2:

  Build AppBundle:

  flutter build appbundle --target-platform android-arm,android-arm64,android-x64 --obfuscate --split-debug-info=/<directory>
  

  Build APK:

  flutter build apk --target-platform android-arm,android-arm64,android-x64 --split-per-abi --obfuscate --split-debug-info=/<directory>
  

Build android studio signed apk with release build type

Pick Build Variants tab at the bottom-left panel and choose a release type:

P.S. Don't forget to give a credit to the @MatPag's comment.

Generating unsigned, release apk with Android Studio

In the release build type, don't specify a signingConfig at all, and your build won't be signed. Release builds don't pick up the default signing config that debug builds get, so it should work for those.

There's a discussion on the adt-dev mailing list about it.

Bear in mind that to build from Android Studio, you'll need to go to the Gradle tasks window and choose the assembleRelease task; normal builds via "Make Project" don't actually build the final APK.

Flutter build apk on release mode cannot generate updated version

I think you need

flutter clean

(I'd consider it a bug that this is necessary, but I'm encountering it as well)

and

flutter build apk --release

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