Authenticate with Firebase on Android using a Phone Number

You can use Firebase Authentication to sign in a user by sending an SMS message to the user’s phone. The user signs in using a one-time code contained in the SMS message.

Add Firebase to your Android project.
Add the dependency for Firebase Authentication to your app-level build.gradle file:

compile 'com.google.firebase:firebase-auth:11.0.1'

1

compile 'com.google.firebase:firebase-auth:11.0.1'
If you haven’t yet connected your app to your Firebase project, do so from the Firebase console.
If you haven’t already set your app’s SHA-1 hash in the Firebase console, do so. See Authenticating Your Client for information about finding your app’s SHA-1 hash.

Create a custom layout for register user contact number, user can verify the authentication code.

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="webkul.opencart.mobikul.PhoneNumberVerifier">
    <LinearLayout
        android:layout_width="match_parent"
        android:padding="20dp"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAlignment="center"
            android:id="@+id/contact"
            android:hint="@string/number"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAlignment="center"
            android:id="@+id/contact_btn"
            android:padding="@dimen/button_padding"
            android:layout_gravity="center"
            android:text="@string/continue1"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAlignment="center"
            android:id="@+id/verify_edt"
            android:hint="@string/verify"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAlignment="center"
            android:id="@+id/verify_btn"
            android:padding="@dimen/button_padding"
            android:layout_gravity="center"
            android:text="@string/continue1"/>
    </LinearLayout>

</RelativeLayout>

<?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:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="webkul.opencart.mobikul.PhoneNumberVerifier">

<LinearLayout

android:layout_width="match_parent"

android:padding="20dp"

android:layout_height="wrap_content"

android:orientation="vertical">

<EditText

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:textAlignment="center"

android:id="@+id/contact"

android:hint="@string/number"/>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textAlignment="center"

android:id="@+id/contact_btn"

android:padding="@dimen/button_padding"

android:layout_gravity="center"

android:text="@string/continue1"/>

<EditText

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:textAlignment="center"

android:id="@+id/verify_edt"

android:hint="@string/verify"/>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textAlignment="center"

android:id="@+id/verify_btn"

android:padding="@dimen/button_padding"

android:layout_gravity="center"

android:text="@string/continue1"/>

</LinearLayout>

</RelativeLayout>

Then pass the phone number to PhoneAuthProvider.verifyPhoneNumber method to request the Firebase to verify the contact number. For example:

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

PhoneAuthProvider.getInstance().verifyPhoneNumber(

phoneNumber, // Phone number to verify

60, // Timeout duration

TimeUnit.SECONDS, // Unit of timeout

this, // Activity (for callback binding)

mCallbacks); // OnVerificationStateChangedCallbacks

When you call PhoneAuthProvider.verifyPhoneNumber, you must also provide an instance of OnVerificationStateChangedCallbacks, which contains implementations of the callback functions that handle the results of the request. For example:

mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {

    @Override
    public void onVerificationCompleted(PhoneAuthCredential credential) {
        // This callback will be invoked in two situations:
        // 1 - Instant verification. In some cases the phone number can be instantly
        //     verified without needing to send or enter a verification code.
        // 2 - Auto-retrieval. On some devices Google Play services can automatically
        //     detect the incoming verification SMS and perform verificaiton without
        //     user action.
        Log.d(TAG, "onVerificationCompleted:" + credential);

        signInWithPhoneAuthCredential(credential);
    }

    @Override
    public void onVerificationFailed(FirebaseException e) {
        // This callback is invoked in an invalid request for verification is made,
        // for instance if the the phone number format is not valid.
        Log.w(TAG, "onVerificationFailed", e);

        if (e instanceof FirebaseAuthInvalidCredentialsException) {
            // Invalid request
            // ...
        } else if (e instanceof FirebaseTooManyRequestsException) {
            // The SMS quota for the project has been exceeded
            // ...
        }

        // Show a message and update the UI
        // ...
    }

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

        // Save verification ID and resending token so we can use them later
        mVerificationId = verificationId;
        mResendToken = token;

        // ...
    }
};

mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {

@Override

public void onVerificationCompleted(PhoneAuthCredential credential) {

// This callback will be invoked in two situations:

// 1 - Instant verification. In some cases the phone number can be instantly

// verified without needing to send or enter a verification code.

// 2 - Auto-retrieval. On some devices Google Play services can automatically

// detect the incoming verification SMS and perform verificaiton without

// user action.

Log.d(TAG, "onVerificationCompleted:" + credential);

signInWithPhoneAuthCredential(credential);

}

@Override

public void onVerificationFailed(FirebaseException e) {

// This callback is invoked in an invalid request for verification is made,

// for instance if the the phone number format is not valid.

Log.w(TAG, "onVerificationFailed", e);

if (e instanceof FirebaseAuthInvalidCredentialsException) {

// Invalid request

// ...

} else if (e instanceof FirebaseTooManyRequestsException) {

// The SMS quota for the project has been exceeded

// ...

}

// Show a message and update the UI

// ...

}

@Override

public void onCodeSent(String verificationId,

PhoneAuthProvider.ForceResendingToken token) {

Log.d(TAG, "onCodeSent:" + verificationId);

// Save verification ID and resending token so we can use them later

mVerificationId = verificationId;

mResendToken = token;

// ...

}

};

After the user enters the verification code that Firebase sent to the user’s phone, create a PhoneAuthCredential object, using the verification code to onCodeSent or onCodeAutoRetrievalTimeOut callback.

PhoneAuthCredential credential = PhoneAuthProvider.getCredential(verificationId, code);

1	PhoneAuthCredential credential = PhoneAuthProvider.getCredential(verificationId, code);

After user verify it’s authentication code pass the credential instanace of PhoneAuthProvider to signInWithPhoneAuthCredential(credential) method.

  private void signInWithPhoneAuthCredential(PhoneAuthCredential credential) {
     FirebaseAuth.getInstance().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("PhoneVERifier", "signInWithCredential:success");
           startActivity(new Intent(PhoneNumberVerifier.this,MainActivity.class));
           finish();
           FirebaseUser user = task.getResult().getUser();
           FirebaseAuth.getInstance().signOut();
           // ...
           } else {
           // Sign in failed, display a message and update the UI
           Log.w("PhoneVERifier", "signInWithCredential:failure", task.getException());
           if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {
           // The verification code entered was invalid
         }
        }
        }
      });
    }

private void signInWithPhoneAuthCredential(PhoneAuthCredential credential) {

FirebaseAuth.getInstance().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("PhoneVERifier", "signInWithCredential:success");

startActivity(new Intent(PhoneNumberVerifier.this,MainActivity.class));

finish();

FirebaseUser user = task.getResult().getUser();

FirebaseAuth.getInstance().signOut();

// ...

} else {

// Sign in failed, display a message and update the UI

Log.w("PhoneVERifier", "signInWithCredential:failure", task.getException());

if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {

// The verification code entered was invalid

}

});

}

Keep Coding and Keep Sharing 🙂

manish choudhary 23 June 2017

. . .

Discuss on Helpdesk

3 comments

sam s Jul 26, 2017 at 10:05 am

how to retrive hose phone number from authentication to databse

Oneil Bogle Jul 23, 2018 at 12:15 pm

how can i extend this to create a 2 page verification

Manish Jul 23, 2018 at 12:16 pm
Either you can create two separte activity for that or two fragment.

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Authenticate with Firebase on Android using a Phone Number

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