Today I am going to start my first post on Codepedia.info.

1. Generate Key Hash Facebook Android Windows
2. How To Generate Key Hash For Facebook In Ionic
3. Generate Key Hash For Facebook Account
4. Generate Key Hash Facebook Android Mac

MD5 hashes are also used to ensure the data integrity of files. Because the MD5 hash algorithm always produces the same output for the same given input, users can compare a hash of the source file with a newly created hash of the destination file to check that it is intact and unmodified. An MD5 hash is NOT encryption. MD5 hashes are also used to ensure the data integrity of files. Because the MD5 hash algorithm always produces the same output for the same given input, users can compare a hash of the source file with a newly created hash of the destination file to check that it is intact and unmodified. Therefore, you want to make sure you create a Release Key Hash and add this to the Android settings for Facebook App ID. To generate a hash of your release key, run the following command on Mac or Windows substituting your release key alias and the path to your keystore. Key Hash is on Facebook. Join Facebook to connect with Key Hash and others you may know. Facebook gives people the power to share and makes the world more open and connected. Worst case time complexity for search with hashing is when all keys collide. Which means the search can take N comparisons. So, O(N). time complexity of calculating the hash. time complexity of doing a single comparison. However, for good enough hash functions the worst case is extremely rare and is almost never encountered with random data. Jan 18, 2018  Go to Facebook Developers and set the hash key to Settings Basic - add Android platform and put the key in Key Hashes field and save it. BUT the problem is to authenticate after this configuration. In the RN the authentication returns error message containing the key hash yyyyyyyyyyyyyyyyy= does not match any stored key hashes.

Overview: This article explains how to generate `Android key hash` for FACEBOOK App and LINKEDIN App as in Login Authentication i.e. Facebook SDK integration to android require an key hash configuration same for LinkedIn App.

Android key hash facebook

So Are you working on Social Login ? From Android to LinkedIn App or Android to Facebook App? Whichever it may be you will need an android hash key facebook and package name to login using social elements.

I hope you all are familiar with android studio or eclipse and required java and SDK required to run an android application.

Let us start with the steps

• Go to your `keytools` directory using command prompt.

Now what is keytools and where will you get it in your system.Generate an ssh key linux.

What is Java Keytool ?

Java Keytool is a key and certificate management utility. It allows users to manage their own public/private key pairs and certificates. It also allows users to cache certificates.

Java Keytool stores the keys and certificates in what is called a Keystore. By default, the Java Keystore is implemented as a file.

It protects private keys with a password. A Keytool Keystore contains the private key and any certificates necessary to complete a chain of trust and establish the trustworthiness of the primary certificate.

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Where will you get or what is its directory?-

Generally Java folder is in C:/Program Files/then move inside that folder to jre6 or jre7. and then move to bin folder. To make things more clear i will post a image/screenshot of it.

• Go to this directory and then enter the following command

Now after you enter the above code you may get the following error

openssl is not recognized as an internal or external command

Below screenshot will make things more clear

Now this error may be because of two things

1. OPENSSL path may be different.
2. OPENSSL may not have been installed in your system.

For first error the solution is to change the path of OpenSSL for eg

C:Usersabcopensslbinopenssl.exe

and for second error the solution is you can download the

To download OPENSSL

After you have downloaded the zip file. Just extract the file to you required path. Preferably (program files) for eg.

C:Program Filesopenssl

• After this, you need to tweak the previous command in the command prompt a bit.

Generate Key Hash Facebook Android Windows

If you have saved the `OpenSSL` folder in example path

• Then you will be asked for password

Enter android as password then you will get the hash key. And then use the hash key wherever you need.

Hope you enjoyed this tutorial. If you have any recommendations, please let us know what you think in the comment section below! See you again next time!

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In our last tutorial we discussed about adding Google Login to Android App which was very well received by all our readers. Without doubt Google Login is the most preferred authentication method for every Android App, but there is one more authentication which is very popular among users- Facebook Login. Facebook is the biggest social media network in the world with more that 2 billion users. Adding Facebook Login in your app will open its doors to a wide range of users and this facebook login example will teach you the same

In this Facebook Login example you will learn how to register your application with Facebook and implement Login and logout in your Android Application

Step 1 : Add gradle dependency

Add the following dependency to app level build.gradle

Step 2 : Register with Facebook

• Before beginning with Facebook Login Example first we need to go to Facebook Developer Platform . Then click on My Apps on top right side and select “Add new App”

• A pop-up dialog appears where we enter “Display Name” and “Contact email” and click “Create App ID”

• On clicking “Create App ID” you are taken to a dashboard. Now select Settings from the left side pane and click “Add Platform” and select Android as the platform.
• Enter package name and class name of your app. You can get the package name for your AndroidManifest.xml file.
• Now we need to generate key- hash for our app.Generating a Development Key Hash
  To generate a development key hash, run the following command in a command prompt in the Java SDK folder:

  This command will generate a 28-character key hash unique to your development environment. Copy and paste it into the field below. You will need to provide a development key hash for the development environment of each person who works on your app.

  Generating a Release Key Hash
  Android apps must be digitally signed with a release key before you can upload them to the store. To generate a hash of your release key, run the following command on Mac or Windows substituting your release key alias and the path to your keystore:

Step 3: Adding Facebook App ID

• We will now enter the App ID created in the above step in our app’s strings.xml. Apart from the App ID we alse create one more string resource by appending ‘fb’ at the beginning of app-id by the name fb_login_protocol_scheme.
• Add the following in your app’s AndroidManifest.xml

Step 4 : Designing the Layout

• We have a simple layout with a two TextViews and an ImageView for our activity. TextViews are to display name and email whereas ImageView is to display the picture of the user.
• More importantly, we also add the facebook login button to the the layout file. This Login button is from the facebook library we added for this project.

Step 5

• With all the setup done, this is the most important step of Facebook Login example. Now we initialize the LoginButton in our java file and set the read permissions as shown below. The LoginButton is a UI element that wraps functionality available in the Facebook’s LoginManager. When someone clicks on the button, the login is initiated with the permissions set.
• The Login button follows the login state, and displays the correct text based on someone’s authentication state. This means that the text on the login button changes when the user has already logged in and it acts as a logout button.

CallbackManager

• CallbackManager is registered to handled the response when the user clicks login button. CallbackManager can be created by calling CallbackManager.Factory.create() as shown below. Once created it should then be registered with the login button.
• On successfully logging in, a LoginResult parameter is received via CallbackManager. This has the new AccessTokenwith the most recently granted or declined permissions. You can get access token from LoginResult using the getAccessToken() API as shown below
• Finally in your onActivityResult method, call callbackManager.onActivityResult to pass the login results to the FacebookSDK via callbackManager.
• Once we have the AccessToken after user logs in we can easily query for his personal details (for which he has granted permissions).
• Basically we create a new GraphRequest using the Access Token and register a listener to handle the response. We parse the JSON response received and get the facebook username, email, user id and picture URL. You can now use these details to register the user in your app.
• This useLoginInformation() method is called from the CallbackManager listener to display details once the user has successfully logged in. Look at the code snippet below for reference

Above screenshots represents app’s state after the user has logged in, as you can see the login button changes to logout and we fetch his username and email

Checking Login Status

• Only one Facebook user at a time can be logged in into your app. Also once a user has logged in he is not logged out unless the access token expires. This basically means that the login status remains intact even if the app is killed.
• As already mentioned the login status is automatically reflected in the LoginButton. The text on the button automatically changes to “Logout” and button acts as the logout button once the user has logged in. Similarly you need to modify the behavior of your app if the user is already logged in.
• In this section we will be checking if the user has already logged in in the onStart() method. If user is already logged in we directly send a request using the saved Access Token and display the details.
• We use AccessToken.getCurrentAccessToken() below. This API will return the current access token for the application if the user is logged in. If not it will return null.

Logout Implementation

• As already mentioned above, once then user successfully logs in the LoginButton works as a Logout button and the user is logged out after clicking it.
• You can also have a custom button for logout and implement user logout using the LoginManager as shown in the snippet below

How To Generate Key Hash For Facebook In Ionic

AccessTokenTracker implementation

Generate Key Hash For Facebook Account

• CallbackManager implementation works fine when you only want to handle user login. Issue with its implementation is that CallbackManager registered with LoginButton is not invoked when the user logs out .
• To be notified when the user logs out we can use AccessTokenTracker. AccessTokenTracker is a class provided by FacebookSDK and is used to receive notification for any changes in Access Token. Basically when the user logs out the access token changes to null and your AccessTokenTracker implementation is notified.
• First step is to extend AccessTokenTracker class and override the onCurrentAccessTokenChanged() method. This method is invoked everytime the access token changes.

• Just extending AccessTokenTracker wont start the tracking. You need to explicitly call accessTokenTracker.startTracking() for the tracking to start . We call it in the onStart() method to initiate the tracking.
• Also its important to stop the tracking before the activity is destroyed . This is done using accessTokenTracker.stopTracking() in the onDestroy() method.
• If you are using AccessTokenTracker you don’t need to implement CallbackManager at all. As already mentioned AccessTokenTracker implementation will be triggered for any change in Access-Token. This means even when the user logs in the tracker will be triggered with the new AccessToken. You just need to handle it as shown below

Conclusion

This finishes our Facebook Login example. Feel free to ask any questions in the comments and if you would like to read more tutorials like these please visit Android Examples. We publish a new Android tutorial every week

Generate Key Hash Facebook Android Mac