SignIn/SignUp/SignOut using Google Firebase on Android Studio :
In our last tutorial, we learned how to create a Firebase Project and how to make ready Android Studio for Firebase . In this tutorial , we will check how to create a new user account using email/password and login/logout to the account. 1. Create a new Project in Android Studio File -> New -> New Project. Remember to use same package name for this project as we have defined in our last tutorial. For me it was “com.codevscolor.firebasedemo”. Create this project with a Simple activity MainActivity.
2. Paste the** google-services.json** file you have downloaded previously to the “app/” folder.
3. We will need internet connection for our project to connect to google Firebase . Add internet permission inside your “AndroidManifest.xml” file
<uses-permission android:name="android.permission.INTERNET" />4. Add the following dependencies inside your build.gradle file located in your home directory.
classpath 'com.android.tools.build:gradle:2.2.2'
classpath 'com.google.gms:google-services:3.0.0'
- Now add firebase auth dependency on your app/build.gradle file. You can always find out latest dependencies for firebase here
For my project , final build.gradle file looks like :
apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
android {
compileSdkVersion 25
buildToolsVersion "25.0.1"
defaultConfig {
applicationId "com.codevscolor.firebasedemo"
minSdkVersion 9
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:25.0.1'
compile "com.google.firebase:firebase-auth:10.0.1"
}
Note : If your gradle sync is failing , click on Tools -> Android -> SDK Manager , Click on SDK Tools tab and install “Google Play Services” and “Google Repository” both.
SignUp to Google Firebase using email and password :
-
Firebase provides a method createUserWithEmail to create a new user with email and password.
-
Create one FirebaseAuth variable
private FirebaseAuth auth;- Get the instance of the variable
auth = FirebaseAuth.getInstance();- Collect email and password and create one user :
auth.createUserWithEmailAndPassword(emailText, pwdText).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (!task.isSuccessful()) {
//failed
} else {
//success
});
}
}- Create one new Activity SignupActivity with layout file as** activity_signup.xml** :
Before signup, We will first check if any of the field is empty, is the email valid and password is more than 6 characters or not.If these checks are true, we will try to create one user on firebase database.
**SignupActivity.java **
public class SignupActivity extends AppCompatActivity {
private EditText etEmail;
private EditText etPassword;
private Button signUpButton;
private String emailText;
private String pwdText;
private TextInputLayout emailLayout;
private TextInputLayout pwdLayout;
private FirebaseAuth auth;
private Context context;
private ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
context = this;
etEmail = (EditText) findViewById(R.id.signup_editTextEmail);
etPassword = (EditText) findViewById(R.id.signup_editTextPassword);
signUpButton = (Button) findViewById(R.id.signup_button);
emailLayout = (TextInputLayout) findViewById(R.id.signup_layout_email);
pwdLayout = (TextInputLayout) findViewById(R.id.signup_layout_password);
progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
getSupportActionBar().setTitle("Sign Up");
auth = FirebaseAuth.getInstance();
signUpButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
hideSoftKeyboard();
progressDialog.show();
signUp();
}
});
}
private void hideSoftKeyboard(){
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(this.getCurrentFocus().getWindowToken(), 0);
}
private void signUp() {
emailText = etEmail.getText().toString().trim();
pwdText = etPassword.getText().toString().trim();
if (emailText.isEmpty()) {
emailLayout.setError(getString(R.string.hint_empty));
} else if (!android.util.Patterns.EMAIL_ADDRESS.matcher(emailText).matches()) {
emailLayout.setError(getString(R.string.error_email));
} else {
emailLayout.setErrorEnabled(false);
}
if (pwdText.isEmpty()) {
pwdLayout.setError(getString(R.string.hint_empty));
} else if (pwdText.length() < 6) {
pwdLayout.setError(getString(R.string.hint_pwd_min));
} else {
pwdLayout.setErrorEnabled(false);
}
if (!emailLayout.isErrorEnabled() && !pwdLayout.isErrorEnabled()) {
auth.createUserWithEmailAndPassword(emailText, pwdText).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (!task.isSuccessful()) {
progressDialog.dismiss();
AlertDialog.Builder builder = new AlertDialog.Builder(context, R.style.DialogStyle);
builder.setMessage("Oops..please try again !!");
builder.setPositiveButton("OK", null);
builder.show();
} else {
progressDialog.dismiss();
AlertDialog.Builder builder = new AlertDialog.Builder(context, R.style.DialogStyle);
builder.setMessage("Yeah..one new user is created !!");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
finish();
}
});
builder.show();
}
}
});
}else {
progressDialog.dismiss();
}
}
}****activity_signup.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorBack"
android:focusable="true"
android:focusableInTouchMode="true"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.codevscolor.firebasedemo.activity.MainActivity">
<android.support.design.widget.TextInputLayout
android:id="@+id/signup_layout_email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColorHint="@color/colorHint">
<EditText
android:id="@+id/signup_editTextEmail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/hint_email"
android:inputType="textEmailAddress"
android:textColor="@color/textColor" />
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout
android:id="@+id/signup_layout_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/signup_layout_email"
android:textColorHint="@color/colorHint">
<EditText
android:id="@+id/signup_editTextPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="45dp"
android:hint="@string/hint_password"
android:inputType="textPassword"
android:textColor="@color/textColor" />
</android.support.design.widget.TextInputLayout>
<Button
android:id="@+id/signup_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/signup_layout_email"
android:layout_marginTop="104dp"
android:background="@color/buttoncolor"
android:text="SignUp"
android:textColor="@color/textColor" />
</RelativeLayout>Run this application, signup one new user and check on Firebase Account :
Sign in :
Sign in is similar to Sign Up. Following method is used for Sign in to Google firebase :
- Suppose the user logged in to the application, closed it and start it again. In this scenario, we need to check if the user is already logged in, and if true, show a different activity .
In our example,
MainActivity will work as SignIn Activity.We will add a login screen to our MainActivity.
Update your MainActivity file as below :
public class MainActivity extends AppCompatActivity {
private EditText etEmail;
private EditText etPassword;
private Button loginButton;
private String emailText;
private String pwdText;
private FirebaseAuth auth;
private TextInputLayout emailLayout;
private TextInputLayout pwdLayout;
private TextView signUp;
private ProgressDialog progressDialog;
private TextView realTimeDataText;
private TextView storageDatabase;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etEmail = (EditText) findViewById(R.id.editTextEmail);
etPassword = (EditText) findViewById(R.id.editTextPassword);
loginButton = (Button) findViewById(R.id.button);
progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
emailLayout = (TextInputLayout) findViewById(R.id.layout_email);
pwdLayout = (TextInputLayout) findViewById(R.id.layout_password);
signUp = (TextView) findViewById(R.id.signUp);
realTimeDataText = (TextView)findViewById(R.id.realTimeDatabase);
realTimeDataText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(MainActivity.this, RealTimeActivity.class);
startActivity(i);
}
});
storageDatabase = (TextView)findViewById(R.id.storageDatabase);
storageDatabase.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(MainActivity.this, StorageActivity.class);
startActivity(i);
}
});
auth = FirebaseAuth.getInstance();
loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
hideSoftKeyboard();
progressDialog.show();
login();
}
});
signUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(MainActivity.this, SignupActivity.class);
startActivity(i);
}
});
if(auth.getCurrentUser() != null){
//user is logged in
Intent i = new Intent(this,LogoutActivity.class);
startActivity(i);
}
}
private void hideSoftKeyboard(){
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(this.getCurrentFocus().getWindowToken(), 0);
}
private void login() {
emailText = etEmail.getText().toString().trim();
pwdText = etPassword.getText().toString().trim();
if (emailText.isEmpty()) {
emailLayout.setError(getString(R.string.hint_empty));
} else if (!android.util.Patterns.EMAIL_ADDRESS.matcher(emailText).matches()) {
emailLayout.setError(getString(R.string.error_email));
} else {
emailLayout.setErrorEnabled(false);
}
if (pwdText.isEmpty()) {
pwdLayout.setError(getString(R.string.hint_empty));
} else if (pwdText.length() < 6) {
pwdLayout.setError(getString(R.string.hint_pwd_min));
} else {
pwdLayout.setErrorEnabled(false);
}
if (!emailLayout.isErrorEnabled() && !pwdLayout.isErrorEnabled()) {
auth.signInWithEmailAndPassword(emailText, pwdText).addOnCompleteListener(MainActivity.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (!task.isSuccessful()) {
progressDialog.dismiss();
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.DialogStyle);
builder.setMessage("Login Failed !!");
builder.setPositiveButton("OK", null);
builder.show();
} else {
progressDialog.dismiss();
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.DialogStyle);
builder.setMessage("Login Successfull !!");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Intent intent = new Intent(MainActivity.this, LogoutActivity.class);
startActivity(intent);
}
});
builder.show();
}
}
});
}else {
progressDialog.dismiss();
}
}
}and layout_activitymain as below :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorBack"
android:focusable="true"
android:focusableInTouchMode="true"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.codevscolor.firebasedemo.activity.MainActivity">
<android.support.design.widget.TextInputLayout
android:id="@+id/layout_email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColorHint="@color/colorHint">
<EditText
android:id="@+id/editTextEmail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/hint_email"
android:inputType="textEmailAddress"
android:textColor="@color/textColor" />
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout
android:id="@+id/layout_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/layout_email"
android:textColorHint="@color/colorHint">
<EditText
android:id="@+id/editTextPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="45dp"
android:hint="@string/hint_password"
android:inputType="textPassword"
android:textColor="@color/textColor" />
</android.support.design.widget.TextInputLayout>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/layout_email"
android:layout_marginTop="104dp"
android:background="@color/buttoncolor"
android:text="Login"
android:textColor="@color/textColor" />
<TextView
android:text="Sign Up"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button"
android:layout_centerHorizontal="true"
android:layout_marginTop="35dp"
android:id="@+id/signUp" />
<TextView
android:text="Test RealTime Database"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/signUp"
android:layout_centerHorizontal="true"
android:layout_marginTop="35dp"
android:id="@+id/realTimeDatabase" />
<TextView
android:text="Test Storage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/realTimeDatabase"
android:layout_centerHorizontal="true"
android:layout_marginTop="35dp"
android:id="@+id/storageDatabase" />
</RelativeLayout>That’s it. Same as SignUpActivity.
If “Login” button is clicked, One new activity LogOutActivity will appear .
LogOutActivity contains a “SignOut” button .
LogOutActivity.java:
public class LogoutActivity extends AppCompatActivity {
private Button logout;
private FirebaseAuth auth;
private ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_logout);
getSupportActionBar().setTitle("Log Out");
logout = (Button)findViewById(R.id.logout_button);
auth = FirebaseAuth.getInstance();
progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
logout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
logout();
}
});
}
private void logout(){
progressDialog.show();
auth.signOut();
FirebaseAuth.AuthStateListener listener = new FirebaseAuth.AuthStateListener(){
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
progressDialog.dismiss();
if(firebaseAuth.getCurrentUser() == null){
//logout successful
AlertDialog.Builder builder = new AlertDialog.Builder(LogoutActivity.this, R.style.DialogStyle);
builder.setMessage("Logout successful !!");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
finish();
}
});
builder.show();
}else{
AlertDialog.Builder builder = new AlertDialog.Builder(LogoutActivity.this, R.style.DialogStyle);
builder.setMessage("Oops..please try again !!");
builder.setPositiveButton("OK", null);
builder.show();
}
}
};
auth.addAuthStateListener(listener);
}
}
** activity_logout.xml **
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_logout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.codevscolor.firebasedemo.account.LogoutActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:background="@color/buttoncolor"
android:text="Log out"
android:textColor="@color/textColor"
android:id="@+id/logout_button" />
</RelativeLayout>
That’s it. Source code is shared on Github. If you love this tutorial, don’t forget to subscribe to our newsletter for new updates.