Basic FireBase Skeleton Code

FireBase-Skeleton.java

package Firebase.Skeleton;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.util.Log;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

//FireData Is For All FireBase Management, Auth+Data
public class FireData extends Activity
{
    private static final String TAG = "TBug";
    private FirebaseAuth FireAuth;
    private String UserName,UserEmail,ImgSRC,UserPass;
    
    
    
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        FireAuth = FirebaseAuth.getInstance();
        
    }
    
    @Override
    public void onStart()
    {
        super.onStart();


        //Current User Info
        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
        if (user != null)
        {
            // Name, email address, and profile photo Url
            String UserName     = user.getDisplayName();
            String UserEmail    = user.getEmail();
            Uri    imgSRC = user.getPhotoUrl();
        
            // Check if user's email is verified
            boolean Verified = user.isEmailVerified();
        
            // The user's ID, unique to the Firebase project. Do NOT use this value to
            // authenticate with your backend server, if you have one. Use
            // FirebaseUser.getToken() instead.
            String UID = user.getUid();
    
            // Check if user is signed in (non-null) and update UI accordingly.
            FirebaseUser currentUser = FireAuth.getCurrentUser();
            updateUI(currentUser);
        }
    
        
        
    }
    private void Regestration()
    {
    
        FireAuth.createUserWithEmailAndPassword(UserName,UserPass)
             .addOnCompleteListener(this, new OnCompleteListener<AuthResult>()
             {
                 @Override
                 public void onComplete(@NonNull Task<AuthResult> task)
                 {
                     if (task.isSuccessful())
                     {
                         // Sign in success, update UI with the signed-in user's information
                         Log.d(TAG, "createUserWithEmail:success");
                         FirebaseUser user = FireAuth.getCurrentUser();
                         updateUI(user);
                     }
                     else
                     {
                         // If sign in fails, display a message to the user.
                         Log.w(TAG, "createUserWithEmail:failure", task.getException());
                         Toast.makeText(getBaseContext().getApplicationContext(), "Authentication failed.",
                                        Toast.LENGTH_SHORT).show();
                         updateUI(null);
                     }
            
                     // ...
                 }
             });
    }
    
    //Handle Google Login Here
    private void Authentication()
    {
    
    }
    
    //Update UserInfo Here
    private void updateUI(FirebaseUser currentUser)
    {
        //ToDo: RTL DB SYNCING
        
    }
}