Integrate Facebook Login with your Android Application

Follow this QuickStart for Facebook Login for Android
https://developers.facebook.com/docs/facebook-login/android

Link the Facebook SDK

mavenCentral()

compile 'com.facebook.android:facebook-login:[4,5)'

Edit Your Manifest

Open your /app/src/main/res/values/strings.xml file

<string name="facebook_app_id">id</string>
<string name="fb_login_protocol_scheme">protocol</string>

Open the /app/manifest/AndroidManifest.xml file.

<uses-permission android:name="android.permission.INTERNET"/>

Add the following meta-data element, an activity for Facebook, and an activity and intent filter for Chrome Custom Tabs after the application element. Replace @string/appname with the name of your Facebook App:

<meta-data android:name="com.facebook.sdk.ApplicationId" 
        android:value="@string/facebook_app_id"/>
    
    <activity android:name="com.facebook.FacebookActivity"
        android:configChanges=
                "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
        android:label="@string/app_name" />
    <activity
        android:name="com.facebook.CustomTabActivity"
        android:exported="true">
        <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>
    </activity>

Provide the Development and Release Key Hashes for Your App

Download OpenSSL which is Requisite
https://slproweb.com/products/Win32OpenSSL.html

Add OpenSSL to path, so you can access it from command line

Go to JDK bin folder

cd C:\Program Files\Java\jdk1.8.0_151\bin

Add debug key hash

keytool -exportcert -alias androiddebugkey -keystore C:\Users\Mahmood\.android\debug.keystore | openssl sha1 -binary | openssl base64

Add release key hash

keytool -exportcert -alias lastlab -keystore C:\Projects\lastlab\keys\store.jks | openssl sha1 -binary | openssl base64

Read QuickStart to Add Facebook Custom Login Button

        buttonSignupFacebook = findViewById(R.id.buttonSignupFacebook);

        facebookLoginManager = LoginManager.getInstance();
        facebookCallbackManager = CallbackManager.Factory.create();

        facebookLoginManager.registerCallback(facebookCallbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                Toast.makeText(SelectSignupActivity.this, loginResult.getAccessToken().toString(),
                        Toast.LENGTH_LONG).show();
            }

            @Override
            public void onCancel() {

            }

            @Override
            public void onError(FacebookException error) {
                Toast.makeText(SelectSignupActivity.this, error.getMessage(),
                        Toast.LENGTH_LONG).show();
                error.printStackTrace();
            }
        });

        buttonSignupFacebook.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                facebookLoginManager.logInWithReadPermissions(SelectSignupActivity.this,
                        Arrays.asList("email", "public_profile", "user_birthday"));
            }
        });

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        facebookCallbackManager.onActivityResult(requestCode, resultCode, data);
        super.onActivityResult(requestCode, resultCode, data);
    }

References
https://developers.facebook.com
https://www.youtube.com/watch?v=SrAXmZkOpJI
https://developers.facebook.com/docs/facebook-login/android
https://stackoverflow.com/questions/16965058/where-is-debug-keystore-in-android-studio
https://developer.android.com/studio/publish/app-signing.html
https://github.com/facebook/facebook-android-sdk
https://developers.facebook.com/docs/facebook-login/permissions/
https://androidammy.blogspot.com/2015/09/facebook-login-with-custom-button.html

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