SignUpActivity.java

package aviraj.firebaseapp;

import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.design.widget.TextInputLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;


import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.android.gms.common.SignInButton;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;
import com.google.firebase.auth.UserProfileChangeRequest;

public class SignUpActivity extends AppCompatActivity {

    private static final String TAG = "SignUpActivity";
    private FirebaseAuth auth;
    private ProgressBar progressBar;
    private EditText signupInputEmail;
    private EditText signupInputPassword;
    private EditText signupInputName;
    private TextInputLayout signupInputLayoutEmail;
    private TextInputLayout signupInputLayoutPassword;
    private SignInButton mGoogleBtn;
    private GoogleApiClient mGoogleApiClient;
    private static final int RC_SIGN_IN = 1;
    private TextInputLayout signupInputLayoutName;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_signup);
        auth = FirebaseAuth.getInstance();

        mGoogleBtn = findViewById(R.id.googleBtn);
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

        mGoogleApiClient = new GoogleApiClient.Builder(getApplicationContext())
                .enableAutoManage(this, new GoogleApiClient.OnConnectionFailedListener() {
                    @Override
                    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
                        Toast.makeText(SignUpActivity.this, "An error occurred.", Toast.LENGTH_LONG).show();
                    }
                })
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

        mGoogleBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                signIn();
            }
        });

        signupInputLayoutEmail = findViewById(R.id.signup_input_layout_email);
        signupInputLayoutPassword = findViewById(R.id.signup_input_layout_password);
        signupInputLayoutName = findViewById(R.id.signup_input_layout_name);
        progressBar = findViewById(R.id.progressBar);


        signupInputEmail = findViewById(R.id.signup_input_email);
        signupInputPassword = findViewById(R.id.signup_input_password);
        signupInputName = findViewById(R.id.signup_input_name);

        Button btnSignUp = findViewById(R.id.btn_signup);
        Button btnLinkToLogIn = findViewById(R.id.btn_link_login);


        btnSignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                submitForm();

            }
        });

        btnLinkToLogIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(SignUpActivity.this, LoginActivity.class);
                startActivity(intent);
            }
        });


    }

    private void submitForm() {
        String name = signupInputName.getText().toString().trim();
        String email = signupInputEmail.getText().toString().trim();
        String password = signupInputPassword.getText().toString().trim();

        if(!checkEmail()) {
            return;
        }
        if(!checkPassword()) {
            return;
        }
        signupInputLayoutEmail.setErrorEnabled(false);
        signupInputLayoutPassword.setErrorEnabled(false);

        progressBar.setVisibility(View.VISIBLE);
        //create user
        auth.createUserWithEmailAndPassword(email, password)
                .addOnCompleteListener(SignUpActivity.this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d(TAG,"createUserWithEmail:onComplete:" + task.isSuccessful());
                        progressBar.setVisibility(View.GONE);
                        // If sign in fails, Log the message to the LogCat. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {
                            Log.d(TAG,"Authentication failed." + task.getException());

                        } else {
                            startActivity(new Intent(SignUpActivity.this, UserActivity.class));
                            finish();
                        }
                    }
                });
        Toast.makeText(getApplicationContext(), "You are successfully Registered !!", Toast.LENGTH_SHORT).show();
    }

    private boolean checkEmail() {
        String email = signupInputEmail.getText().toString().trim();
        if (email.isEmpty() || !isEmailValid(email)) {

            signupInputLayoutEmail.setErrorEnabled(true);
            signupInputLayoutEmail.setError(getString(R.string.err_msg_email));
            signupInputEmail.setError(getString(R.string.err_msg_required));
            requestFocus(signupInputEmail);
            return false;
        }
        signupInputLayoutEmail.setErrorEnabled(false);
        return true;
    }

    private boolean checkPassword() {

        String password = signupInputPassword.getText().toString().trim();
        if (password.isEmpty() || !isPasswordValid(password)) {

            signupInputLayoutPassword.setError(getString(R.string.err_msg_password));
            signupInputPassword.setError(getString(R.string.err_msg_required));
            requestFocus(signupInputPassword);
            return false;
        }
        signupInputLayoutPassword.setErrorEnabled(false);
        return true;
    }

    private static boolean isEmailValid(String email) {
        return !TextUtils.isEmpty(email) && android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
    }

    private static boolean isPasswordValid(String password){
        return (password.length() >= 6);
    }

    private void requestFocus(View view) {
        if (view.requestFocus()) {
            getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        progressBar.setVisibility(View.GONE);
    }

    private void signIn() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }

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

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            if (result.isSuccess()){
                // Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = result.getSignInAccount();
                firebaseAuthWithGoogle(account);
                Intent intent = new Intent(SignUpActivity.this, UserActivity.class);
                startActivity(intent);
                finish();
            } else{
                setContentView(R.layout.activity_signup);
            }
        }
    }
    private void firebaseAuthWithGoogle(GoogleSignInAccount account){
        AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(), null);
        auth.signInWithCredential(credential)
                .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, "signInWithCredential:success");
                            FirebaseUser user = auth.getCurrentUser();
                            UserProfileChangeRequest profileUpdates = new UserProfileChangeRequest.Builder().setDisplayName("John Smith").build();

                            user.updateProfile(profileUpdates);

                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "signInWithCredential:failure", task.getException());
                            Toast.makeText(SignUpActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();

                        }

                        // ...
                    }
                });

    }

}