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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 Facebook App ID and Client Token?




A Facebook app ID is a unique identifier that represents your app on Facebook. A client token is a secret key that you use to access Facebook APIs from your app. To get a Facebook app How to Integrate Facebook SDK for Android into Your Project?




After you have created your Facebook app ID, client token, and key hash, you need to integrate the Facebook SDK for Android into your project. The Facebook SDK for Android enables you to use Facebook Login, Sharing, App Events, and other features in your app. Here are the steps to integrate the Facebook SDK for Android into your project:


How to Add the SDK as a Build Dependency and Import It?




To use the Facebook SDK in an Android Studio project, you need to add the SDK as a build dependency and import it. You can do this by following these steps:


  • Go to Android Studio New Project Minimum SDK. Select API 15: Android 4.0.3 (IceCreamSandwich) or higher and create your new project.



  • Open the file Gradle Scripts build.gradle (Project: ) and add the following:



mavenCentral()


  • Save and close the build.gradle (Project: ) file.



  • Open the file Gradle Scripts build.gradle (Module: app) and add the following to the dependencies section:



implementation 'com.facebook.android:facebook-android-sdk:latest.release'


  • Save and close the build.gradle (Module: app) file.



  • Build your project.



  • Now you can import com.facebook.FacebookSdk into your app.



How to Update Your Manifest File with Your App ID and Client Token?




You need to add your app ID and client token to your project's string file and update the manifest file. You can do this by following these steps:


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  • Open the file res/values/strings.xml and add the following:



<string name="facebook_app_id">YOUR_APP_ID</string> <string name="fb_login_protocol_scheme">fbYOUR_APP_ID</string> <string name="facebook_client_token">YOUR_CLIENT_TOKEN</string>


  • Replace YOUR_APP_ID and YOUR_CLIENT_TOKEN with your information.



  • Save and close the strings.xml file.



  • Open the file AndroidManifest.xml and add the following inside the tag:



<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/> <meta-data android:name="com.facebook.sdk.ClientToken" android:value="@string/facebook_client_token"/>


  • Add the following inside the tag that contains your main activity:



<intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="@string/fb_login_protocol_scheme" /> </intent-filter>


  • Save and close the AndroidManifest.xml file.



How to Initialize the SDK and Log App Events?




You need to initialize the SDK and log app events in your main activity. You can do this by following these steps:


  • Import com.facebook.FacebookSdk and com.facebook.appevents.AppEventsLogger in your main activity class.



  • Add the following code in the onCreate() method of your main activity class:



// Initialize Facebook SDK FacebookSdk.sdkInitialize(getApplicationContext()); // Log app activation event AppEventsLogger.activateApp(this);


  • Add the following code in the onResume() method of your main activity class:



// Log app resume event AppEventsLogger logger = AppEventsLogger.newLogger(this); logger.logEvent("app_resume");


  • Add the following code in the onPause() method of your main activity class:



// Log app pause event AppEventsLogger logger = AppEventsLogger.newLogger(this); logger.logEvent("app_pause");


How to Use Login Button and Login Manager for Facebook Login?




You can use Login Button or Login Manager for Facebook Login in your app. Login Button is a UI element that wraps functionality available in Login Manager. When someone clicks on Login Button, they will be prompted to log in with their Facebook credentials. Login Manager allows you to perform login programmatically without using a UI element You can use Login Button or Login Manager for Facebook


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