Sign apk using certificate.pem and key.pk8 in Android Studio by using gradle

Question

how to use below commands in Android Studio? java -jar signapk.jar certificate.pem key.pk8 file.apk file-signed.apk

Answer 1

My reply comes probably too late for the question itself, but could be useful to someone else.

In order to sign an apk with Android studio you need to provide a .keystore file. Now, following this tutorial I found this tool that allows you to create a keystore file starting from your .pk8 and .pem files. All you have to do is:

1. Download keytool (from the link I gave you)
2. Generate your keystore file keytool-importkeypair -k ~/.android/key.keystore -p android -pk8 platform.pk8 -cert platform.x509.pem -alias platform
3. Use it to sign your app, either clicking on 'Build--> Generate Signed Bundle / APK' or using singingConfig in your app's .gradle:

signingConfigs {
    config {
        storeFile file("key.keystore")
        storePassword 'password'
        keyAlias 'alias'
        keyPassword 'password'
        }
}

buildTypes {
    release {
        signingConfig signingConfigs.config
    }
}

Answer 2

1. Copy APK and Key Files to the following folder: C:\Users%USERNAME%\AppData\Local\Android\Sdk\build-tools* (Any of the subfolders will do; for example: 27.0.3)

2. Sign the APK with the following command: apksigner.bat sign --key .pk8 --cert .x509.pem APKFILE.apk