SignUpActivity.java

package com.druve.druve;

import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

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;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import java.util.Objects;

public class SignUpActivity extends AppCompatActivity implements View.OnClickListener {
    private static final String TAG = "SignUpActivity";
    Button signUpBtn;
    EditText fullName, emailAddress, passwordOne, confirmPassword;
    AlertDialog.Builder builder;
    AlertDialog alertDialog;

    private FirebaseDatabase mFirebaseDatabase;
    private FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener mAuthStateListener;
    private DatabaseReference mDatabaseReference;
    private String userID;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sign_up);
        Objects.requireNonNull(getSupportActionBar()).hide();
        initViews();
        mAuth = FirebaseAuth.getInstance();
        mFirebaseDatabase = FirebaseDatabase.getInstance();
        mDatabaseReference = mFirebaseDatabase.getReference("users");
        FirebaseUser user = mAuth.getCurrentUser();

        dataBaseCalls();
    }

    public void dataBaseCalls() {
        mAuthStateListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    Log.d(TAG, "onAuthStateChanged: signed_in");
                    Toast.makeText(SignUpActivity.this,
                            "Successfully sign in with" + user.getUid(), Toast.LENGTH_SHORT).show();
                } else {
                    Log.d(TAG, "onAuthStateChanged: Signed_out");
                    Toast.makeText(SignUpActivity.this, "Signed out", Toast.LENGTH_SHORT).show();
                }
            }
        };

        mDatabaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                Toast.makeText(SignUpActivity.this, "Added data to database", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });
    }

    //init views
    public void initViews() {
        //EditText Field
        fullName = findViewById(R.id.full_name_text);
        emailAddress = findViewById(R.id.email_text);
        passwordOne = findViewById(R.id.password_edit);
        confirmPassword = findViewById(R.id.confirm_password_text);

        //Buttons
        signUpBtn = findViewById(R.id.signup_button);
        signUpBtn.setOnClickListener(this);
    }

    public void validateFields() {
        String name = fullName.getText().toString().trim();
        String eAddress = emailAddress.getText().toString().trim();
        String passOne = passwordOne.getText().toString().trim();
        String passTwo = confirmPassword.getText().toString().trim();
        if (name.isEmpty()) {
            Toast.makeText(this, "Enter Full name.", Toast.LENGTH_SHORT).show();
        } else if (eAddress.isEmpty()) {
            Toast.makeText(this, "Enter a valid Email address", Toast.LENGTH_SHORT).show();
        } else if (passOne.isEmpty()) {
            Toast.makeText(this, "Enter Password.", Toast.LENGTH_SHORT).show();
        } else if (!passOne.equals(passTwo)) {
            Toast.makeText(this, "Passwords do not match", Toast.LENGTH_SHORT).show();
        } else {
            createUser(eAddress, passOne, name);
        }
    }

    private void createUser(final String eAddress, String passwordCode, final String name) {



        showDialog();

        mAuth.createUserWithEmailAndPassword(eAddress, passwordCode)
                .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");
                            emailVerification();
                            userID = mDatabaseReference.push().getKey();
                            User user = new User(name, eAddress);
                            mDatabaseReference.child("users").child(userID).setValue(user);
                            Toast.makeText(SignUpActivity.this,
                                    user.getEmail(), Toast.LENGTH_SHORT).show();
                            alertDialog.hide();
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "createUserWithEmail:failure", task.getException());
                            Toast.makeText(SignUpActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                            alertDialog.hide();
                        }
                    }
                });
    }

    public void emailVerification() {
        final FirebaseUser user = mAuth.getCurrentUser();
        if (user != null) {
            user.sendEmailVerification()
                    .addOnCompleteListener(this, new OnCompleteListener<Void>() {
                        @Override
                        public void onComplete(@NonNull Task<Void> task) {
                            if (task.isSuccessful()) {
                                //                            String mail = user.getEmail();
                                mailSent();

                            } else {
                                Log.e(TAG, "sendEmailVerification", task.getException());
                                Toast.makeText(SignUpActivity.this,
                                        "Failed to send verification email.",
                                        Toast.LENGTH_SHORT).show();
                            }
                        }
                    });
        }
    }

    @Override
    public void onClick(View v) {
        int id = v.getId();
        if (id == R.id.signup_button) {
            validateFields();
        }

    }

    public void showDialog() {
        //Now we need an AlertDialog.Builder object
        builder = new AlertDialog.Builder(this);

        LayoutInflater layoutInflater = getLayoutInflater();
        @SuppressLint("InflateParams")
        View dialogView = layoutInflater.inflate(R.layout.alert_dialog, null);

        //setting the view of the builder to our custom view that we already inflated
        builder.setView(dialogView);

        TextView textView = dialogView.findViewById(R.id.progress_text);
        textView.setText(getResources().getString(R.string.signin_dialog));

        //finally creating the alert dialog and displaying it
        alertDialog = builder.create();
        alertDialog.show();
    }

    public void mailSent() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage
                ("Verify your Email address in the mail sent to you.");
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                finish();
                startActivity(new Intent(SignUpActivity.this, SignInActivity.class));
            }
        });

        AlertDialog alertDialog = builder.create();
        alertDialog.show();
    }

    @Override
    protected void onStart() {
        super.onStart();
        mAuth.addAuthStateListener(mAuthStateListener);
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mAuthStateListener != null) {
            mAuth.removeAuthStateListener(mAuthStateListener);
        }
    }
}