How to Build Signed APK from Android Studio for Flutter

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>
  

Generate Signed Bundle/APK option is missing in Android Studio

Try open project with android icon. and then generate signed bundle apk will be showing on the build bar

how generate signed apk in flutter

Try these steps

1. Go to in your project & then Tools -> Flutter -> Open for Editing in Android Studio
2. Then Select New Window option
3. Wait for the project synchronization to finish. After that
   Go to Build -> GenerateSigned Bundle/APK...
4. Select Android App Bundle or APK Option as per your need. (usually app bundle is the best option) and click Next button.
5. Select Create new.. option to generate new Signed key (When you release your app First Time)

you will have to fill the form to create it

Key store Path -

Path where your key store file i.e .jks file stored (as shown in above image). [Best way Select the path within your project directory.]

Key store password -

Enter password e.g. 123456

Key alias -

Enter Key alias (Name of .jks file) e.g. key

Key Password -

Enter Key password (Choose different password than Key store password) e.g. key123456

Validity(years) - Keep it as it is or change as per your requirements.

Certificate -

Fill certificate information (Not all fields are mandatory)

6. Select build variants - release and Signature versions both V1 and V2 respectively and click Finish button.

After all this you should have the output of the build process

How to get signed apk for flutter with existing app keystore?

If you generated previous fresh Signed APK using Android Studio as steps given in bellow link then don't worry.

For more info check this link

stackoverflow.com/questions/55536637/how-to-build-signed-apk-from-android-studio-for-flutter/60163484#60163484

Now just follow the following steps to build signed apk with existing keystore details.

IMPORTANT

Before generating Signed APK with existing keystore details make sure upgrade each time your Flutter Version from pubspec.yaml file and Version Code from local.properties file.

For example

If previous flutter version code in pubspec.yaml file is

version: 1.0.0+1 then change it or upgrade it to the version: 1.0.0+2 or any other greater number than previous after + sign.

And if flutter.versionCode in Project -> android -> local.properties is

flutter.versionCode=1 then change it or upgrade it to the flutter.versionCode=2 or any other greater number than previous code.
[This Version Code is important while releasing your app on Google Play Console with existing app i.e. for release New Update]

After that follow the steps bellow -

Step 1:

Go to in your project & then Tools -> Flutter -> Open for Editing in Android Studio as shown below

Then Select New Window option as shown below

Step 2 :

Wait for while until project synchronization. After that
Go to Build -> GenerateSigned Bundle/APK... option from menu bar as shown bellow

Step 3 :

Select Android App Bundle or APK Option as per your need. (Android App Bundle is best solution) and click Next button.

Step 4 :

Select Choose existing... option to generate Signed APK with existing keystore details. (When you upload flutter app in place of existing application with same package.)

Select Key store path where your key store file .jks file stored. [The path within your project directory.] (as mentioned above link)]

Then fill the all options i.e.

Key store password

Key alias

Key Password

and Click Next button as shown bellow...

Step 5 :

Select options

Build variants - release and

Signature versions both V1 and V2 respectively as shown above screen shot and click Finish button as shown bellow.

Step 8 :

Wait for a while until Gradle Build Running process.

and finally you will get the Generate Signed APK : (APKs) generated successfully. from that click on Locate option to get Location of your Generate Signed APK File. as shown bellow.

That's it you generated Signed APK successfully for update your flutter app in place of existing application with same package.

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