Step 1
Navigate to your Android Studio folder and find the keytool application. For me, this is in C:\Program Files\Android\Android Studio\jre\bin. Open a command window as administrator and navigate to this folder. You will now need to make use of keytool to generate a keystore for re-signing your APK. Next, type the following into the command window.
keytool -genkey -v -keystore C:\my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000
Replacing “my-release-key” with a name of your choice and “alias_name” with a name of your choice. You will be prompted to enter a username and password. Enter these and you’re good to go. Keep the folder and command Window open.
Step 2
Copy the application you want to sign to the folder you found keytool in.
Step 3
Open the APK of your choice with any zip viewer as an archive. I recommend 7Zip. Delete the “META-INF” folder inside of the APK and continue. META-INF contains the key signing files. Copy the APK to the folder containing jarsigner too if you want for ease of use. Jarsigner is used to re-sign your APK.
Step 4
Inside of the folder in a command window, type the following command to re-sign your APK.
jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore C:\my-release-key.keystore
my_application.apk alias_name
Replacing “my-release-key”, “my_application” and “alias_name” with the required information. You will be asked for the keystore password. Once entered, you will see the file has been signed.
Step 5
Copy the file to your phone and try it out! It should install fine and if you try to update it via the Play Store you will see it can’t.
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