I completed the first 8 steps of the Facebook Login for Android - Quickstart available at https://developers.facebook.com/docs/facebook-login/android/. After that, I continued with the remaining steps shared below.
I added the following code to my SignIn.java file:
package ...;
...
import java.util.Arrays;
...
import com.facebook.CallbackManager;
public class SignIn ...{
private CallbackManager callbackManager;
private static final String EMAIL = "email";
private LoginButton fbLoginButton;
...
protected void onCreate(...){
...
callbackManager = CallbackManager.Factory.create();
fbLoginButton = (LoginButton) findViewById(R.id.fbLoginButton);
fbLoginButton.setReadPermissions(Arrays.asList(EMAIL));
fbLoginButton.registerCallback(callbackManager, new FacebookCallback() {
@Override
public void onSuccess(LoginResult loginResult) {
// App code
handleFacebookAccessToken(loginResult.getAccessToken());
}
@Override
public void onCancel() {
// App code
}
@Override
public void onError(@NonNull FacebookException e) {
// App code
e.printStackTrace();
}
});
...
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
callbackManager.onActivityResult(requestCode, resultCode, data);
super.onActivityResult(requestCode, resultCode, data);
}
...
private void handleFacebookAccessToken(AccessToken token) {
System.out.println("Facebook AccessToken: "+token);
}
...
}
I added the following code to my sign_in.xml file:
<com.facebook.login.widget.LoginButton
android:id="@+id/fbLoginButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:layout_marginBottom="20dp" />