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How to Sign and Align apk files for the playstore using Cordova
In this video I show you how to sign an apk file before it can be published to the appstore...
Before you start following this tutorial you will need to know that I have used Cordova as the platform to build this app...
Below are the most important steps to get this done...
Step 1:
Now we can tell cordova to generate our release build:
D:\projects\Phonegap\Example> cordova build --release android
Then, we can find our unsigned APK file in platforms/android/ant-build. In our example, the file was platforms/android/ant-build/Example-release-unsigned.apk
Step 2:
Create your keystore file.Note that you will need to create your keystore file and keep it safely as it will be useful for future uploads for your app on the playstore...
Key Generation:
Syntax:
keytool -genkey -v -keystore <keystoreName>.keystore -alias <Keystore AliasName> -keyalg <Key algorithm> -keysize <Key size> -validity <Key Validity in Days>Egs:
keytool -genkey -v -keystore NAME-mobileapps.keystore -alias NAMEmobileapps -keyalg RSA -keysize 2048 -validity 10000
keystore password? : xxxxxxx
What is your first and last name? : xxxxxx
What is the name of your organizational unit? : xxxxxxxx
What is the name of your organization? : xxxxxxxxx
What is the name of your City or Locality? : xxxxxxx
What is the name of your State or Province? : xxxxx
What is the two-letter country code for this unit? : xxx
Then the Key store has been generated with name as NAME-mobileapps.keystore
Step 3:
Place the generated keystore and released apk in the ant build folder for instance
D:\projects\Phonegap\Example\platforms\android\ant-build
D:\projects\Phonegap\Example\platforms\android\ant-build
You will need to Create the ant-build folder if its not created in the android folder...
To sign the unsigned APK, run the jarsigner tool which is also included in the JDK:
Syntax:
jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore <keystorename <Unsigned APK file> <Keystore Alias name>Egs:
D:\projects\Phonegap\Example\platforms\android\ant-build> jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore NAME-mobileapps.keystore Example-release-unsigned.apk xxxxxmobileapps
Enter KeyPhrase as 'xxxxxxxx'
This signs the apk in place.
Step 4:
Finally, we need to run the zip align tool to optimize the APK:
D:\projects\Phonegap\Example\platforms\android\ant-build> zipalign -v 4 Example-release-unsigned.apk Example.apk
OR
D:\projects\Phonegap\Example\platforms\android\ant-build> C:\Phonegap\adt-bundle-windows-x86_64-20140624\sdk\build-tools\android-4.4W\zipalign -v 4 Example-release-unsigned.apk Example.apk
Now we have our final release binary called example.apk and we can release this on the Google Play.
Comment below if you have any doubts or questions thank you!
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