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