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Edwin Aboryo
Edwin Aboryo

Facebook SDK for Android: How to Generate and Use the Key Hash

What is a Facebook APK Hash and Why Do You Need It?

If you are developing an Android app that uses Facebook Login, you might have encountered the term "Facebook APK hash" or "key hash". But what does it mean and why do you need it?

In this article, we will explain what an APK file is, how to generate it, and how to create a key hash from it. We will also show you how to get a Facebook app ID and client token, how to register your app on Facebook developer portal, how to add your key hash to your Facebook developer profile, and how to integrate Facebook SDK for Android into your project. By the end of this article, you will be able to use Facebook Login in your Android app with ease.

facebook apk hash

What is an APK File and How to Generate It?

An APK file is an Android application package file that contains all the files and resources needed to run an Android app. It is essentially a zip file with a .apk extension. You can generate an APK file from your Android Studio project by following these steps:

  • Go to Android Studio Build Build Bundle(s) / APK(s) Build APK(s).

  • Wait for the build process to finish.

  • Find the generated APK file in the app/build/outputs/apk/debug folder of your project directory.

What is a Key Hash and How to Create It?

A key hash is a unique identifier that Facebook uses to authenticate interactions between your app and the Facebook app. It is a base64-encoded string that represents the SHA-1 fingerprint of your app's signing certificate. You can create a key hash from your APK file by using the keytool command-line tool that comes with Java Development Kit (JDK). Here are the commands for different operating systems:

On OS X:

keytool -exportcert -alias androiddebugkey -keystore /.android/debug.keystore openssl sha1 -binary openssl base64

On Windows:

keytool -exportcert -alias androiddebugkey -keystore %HOMEPATH%\.android\debug.keystore openssl sha1 -binary openssl base64

You will be prompted to enter the password for your keystore. The default password for the debug keystore is "android". The output of the command is your key hash. Copy it and save it somewhere for later use.

What are the Benefits of Using a Key Hash for Facebook Login?

Using a key hash for Facebook Login has several benefits, such as:

  • It ensures that only your app can access your Facebook app ID and client token.

  • It prevents unauthorized apps from impersonating your app and accessing user data.

  • It enhances the security and privacy of your app and your users.

How to Get a Facebo