Authenticate with Firebase on Android (Phone Number) JAVA

Sign-in for your Firebase project

1. In the Firebase Console ,Open the Authenticate Section
2. On the Sign -in-method ,Enable the Phone Number Sign-in-method

Download Source code Link

usually app/build.gradle ADD GRADLE -implementation ‘com.google.firebase:firebase-auth:19.4.0’

Send Verification code to the phone (JAVA)

PhoneAuthProvider.getInstance().verifyPhoneNumber(
        phoneNumber,        // Phone number to verify
        60,                 // Timeout duration
        TimeUnit.SECONDS,   // Unit of timeout
        this,               // Activity (for callback binding)
        mCallbacks);        // OnVerificationStateChangedCallbacks

Firebase can also be localized by specifying the auth language via the setLanguageCode method -auth.setLanguageCode(“fr”);

When you call PhoneAuthProvider.verifyPhoneNumber, you must also provide an instance of OnVerificationStateChangedCallbacks

mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {

    @Override
    public void onVerificationCompleted(PhoneAuthCredential credential) {
     
        Log.d(TAG, "onVerificationCompleted:" + credential);

        signInWithPhoneAuthCredential(credential);
    }

    @Override
    public void onVerificationFailed(FirebaseException e) {
       verification is made,
     
        Log.w(TAG, "onVerificationFailed", e);

        if (e instanceof FirebaseAuthInvalidCredentialsException) {
            
        } else if (e instanceof FirebaseTooManyRequestsException) {
            
        }
    }

    @Override
    public void onCodeSent(@NonNull String verificationId,
                           @NonNull PhoneAuthProvider.ForceResendingToken token) {
   
        Log.d(TAG, "onCodeSent:" + verificationId);
        mVerificationId = verificationId;
        mResendToken = token;
    }
};

Sign in the user

private void signInWithPhoneAuthCredential(PhoneAuthCredential credential) {
    mAuth.signInWithCredential(credential)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
   if (task.isSuccessful()) {
                        signed-in user's information
                        Log.d(TAG, "signInWithCredential:success");

  FirebaseUser user = task.getResult().getUser();
                      
 } 
else
 {

 Log.w(TAG, "signInWithCredential:failure", task.getException());
 if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {
                           invalid
                        }
                    }
                }
            });
}

To sign out a user, call signout

FirebaseAuth.getInstance().signOut();

THANK YOU