Firebase Phone Number Authentication In Android Studio

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Firebase Phone Number Authentication In Android Studio.Hello Guys, Welcome to my new tutorial. Today we will learn how we can implement Phone Number Authentication/Verification using Firebase. Firebase is platform which allow to build web and mobile applications without server side programming language. It provides almost every features ( Authentication,Push Messaging Services,Real Time Database,Storage etc) which we need for our application.

You have seen Phone Number Authentication in most of the application. In which you enter your Phone Number and it send a OTP(One time password) to your number and you need to enter that OTP to authenticate.

Firebase provides simple way to authenticate user by using Phone Number Authentication and yet it is simple to implement. So lets start.

Previously we have already seen how we can implement this feature using Facebook Account Kit. You can check out that tutorial here – Facebook Account Kit SMS Authentication for Android

Firebase Phone Number Authentication In Android Studio – Video Demo

Firebase Phone Number Authentication In Android Studio

Now let’s learn how to implement Firebase Phone Authentication in our project.

Creating Android Project

Create a new project in Android Studio File–>New–>New Project.
Enter Application Name, Package Name, Select Empty Activity and click on finish.

Add Firebase To Our Project

Click on tools -> firebase.

Connect to Firebase – Click on Connect to Firebase and then you need to choose project you can also create new firebase project and press Connect to Firebase.
Add Firebase Authentication to your app – Next you need to add gradle to your project. Click “Add Firebase Authentication to your app” and Accept Changes.

Enable Firebase Phone Authentication –To do this go to Firebase Console and open the project that you are using.Then go to Sign In Method and enable Phone Authentication.

Designing UI (Firebase Phone Number Authentication In Android Studio)

Now lets Design the User Interface. In our project we will have two activity which are MainActivity and AuthActivity.
In Main Activity we will check whether user is login or not if he is not we will redirect him to Auth Activity.
Create AuthActivity.class and activity_auth.xml.

activity_main.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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.androidcodefinder.firebasephonenumberauth.MainActivity">

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="231dp"
        android:text="logout"
        app:layout_constraintTop_toTopOf="parent"
        tools:layout_editor_absoluteX="0dp" />

    <TextView
        android:id="@+id/userPhoneNumber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/button2"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="105dp"
        android:text="TextView" />
</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="com.androidcodefinder.firebasephonenumberauth.MainActivity">

<Button

android:id="@+id/button2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:layout_marginTop="231dp"

android:text="logout"

app:layout_constraintTop_toTopOf="parent"

tools:layout_editor_absoluteX="0dp" />

<TextView

android:id="@+id/userPhoneNumber"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBottom="@+id/button2"

android:layout_centerHorizontal="true"

android:layout_marginBottom="105dp"

android:text="TextView" />

</RelativeLayout>

activity_auth.xml-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:background="@color/colorAccent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    tools:context="com.androidcodefinder.firebasephonenumberauth.AuthActivity">

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:fontFamily="sans-serif-condensed"
        android:text="Firebase Phone Authentication"
        android:textColor="@android:color/white"
        android:textSize="25dp" />

    <LinearLayout
        android:id="@+id/phoneLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:background="@drawable/common_google_signin_btn_icon_light_normal_background"
        android:gravity="center_horizontal"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="Step 1" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Verify phone number"
            android:textColor="@android:color/black"
            android:textSize="20dp" />

        <EditText
            android:id="@+id/phoneText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:ems="10"
            android:hint="Phone Number"
            android:inputType="number" />

        <ProgressBar
            android:id="@+id/phoneBar"
            style="?android:attr/progressBarStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:visibility="invisible" />

        <Button
            android:id="@+id/sendButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:layout_weight="1"
            android:background="@android:color/holo_blue_dark"
            android:text="Send Code"
            android:textColor="@android:color/white" />

    </LinearLayout>

    <LinearLayout
        android:id="@+id/codeLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:background="@drawable/common_google_signin_btn_icon_light_normal_background"
        android:gravity="center_horizontal"
        android:orientation="vertical"
        android:visibility="gone">

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="Step 2" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Enter code sent to your phone"
            android:textColor="@android:color/black"
            android:textSize="20dp" />

        <EditText
            android:id="@+id/codeText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:ems="10"
            android:hint="Enter Code"
            android:inputType="number" />

        <ProgressBar
            android:id="@+id/codeBar"
            style="?android:attr/progressBarStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:visibility="invisible" />

        <Button
            android:id="@+id/verifyButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:layout_weight="1"
            android:background="@android:color/holo_blue_dark"
            android:text="Enter Code"
            android:textColor="@android:color/white" />
    </LinearLayout>


</LinearLayout>

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<?xml version="1.0" encoding="utf-8"?>

<LinearLayout 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"

android:background="@color/colorAccent"

android:gravity="center_horizontal"

android:orientation="vertical"

tools:context="com.androidcodefinder.firebasephonenumberauth.AuthActivity">

<TextView

android:id="@+id/textView4"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_margin="20dp"

android:fontFamily="sans-serif-condensed"

android:text="Firebase Phone Authentication"

android:textColor="@android:color/white"

android:textSize="25dp" />

<LinearLayout

android:id="@+id/phoneLayout"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="15dp"

android:background="@drawable/common_google_signin_btn_icon_light_normal_background"

android:gravity="center_horizontal"

android:orientation="vertical">

<TextView

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10dp"

android:text="Step 1" />

<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Verify phone number"

android:textColor="@android:color/black"

android:textSize="20dp" />

<EditText

android:id="@+id/phoneText"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:ems="10"

android:hint="Phone Number"

android:inputType="number" />

<ProgressBar

android:id="@+id/phoneBar"

style="?android:attr/progressBarStyle"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:visibility="invisible" />

<Button

android:id="@+id/sendButton"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="5dp"

android:layout_weight="1"

android:background="@android:color/holo_blue_dark"

android:text="Send Code"

android:textColor="@android:color/white" />

</LinearLayout>

<LinearLayout

android:id="@+id/codeLayout"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="15dp"

android:background="@drawable/common_google_signin_btn_icon_light_normal_background"

android:gravity="center_horizontal"

android:orientation="vertical"

android:visibility="gone">

<TextView

android:id="@+id/textView2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10dp"

android:text="Step 2" />

<TextView

android:id="@+id/textView3"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Enter code sent to your phone"

android:textColor="@android:color/black"

android:textSize="20dp" />

<EditText

android:id="@+id/codeText"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:ems="10"

android:hint="Enter Code"

android:inputType="number" />

<ProgressBar

android:id="@+id/codeBar"

style="?android:attr/progressBarStyle"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:visibility="invisible" />

<Button

android:id="@+id/verifyButton"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="5dp"

android:layout_weight="1"

android:background="@android:color/holo_blue_dark"

android:text="Enter Code"

android:textColor="@android:color/white" />

</LinearLayout>

Back End Code

First let us check whether user is logged In or not.
In our MainActivity.java first declare an Instance of FirebasAuth.

private FirebaseAuth mAuth;

1	private FirebaseAuth mAuth;

After that In onCreate() method , initialize the FirebaseAuth instance.

mAuth = FirebaseAuth.getInstance();

1	mAuth = FirebaseAuth.getInstance();

When initializing your Activity, check to see if the user is currently Logged in.If not redirect him to Auth Activity.

    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();

        if(currentUser==null){
            Intent notLoggedIn = new Intent(MainActivity.this,AuthActivity.class);
            startActivity(notLoggedIn);
            finish();
        }
    }

@Override

public void onStart() {

super.onStart();

// Check if user is signed in (non-null) and update UI accordingly.

FirebaseUser currentUser = mAuth.getCurrentUser();

if(currentUser==null){

Intent notLoggedIn = new Intent(MainActivity.this,AuthActivity.class);

startActivity(notLoggedIn);

finish();

}

We need to add one more function in our this activity which is LOGOUT. We will use Button to logout user.
Complete code for MainActivity.java is-

package com.androidcodefinder.firebasephonenumberauth;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class MainActivity extends AppCompatActivity {

    private FirebaseAuth mAuth;
    private Button logout;
    private TextView userPhoneNumber;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        logout = (Button)findViewById(R.id.button2);
        userPhoneNumber = (TextView)findViewById(R.id.userPhoneNumber);
        mAuth = FirebaseAuth.getInstance();

        logout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mAuth.signOut();
                redirect();
            }
        });
    }

    private void redirect(){
        Intent notLoggedIn = new Intent(MainActivity.this,AuthActivity.class);
        startActivity(notLoggedIn);
        finish();
    }

    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();

        if(currentUser==null){
            Intent notLoggedIn = new Intent(MainActivity.this,AuthActivity.class);
            startActivity(notLoggedIn);
            finish();
        }
        else{
            userPhoneNumber.setText("Verified number is- "+FirebaseAuth.getInstance().getCurrentUser().getPhoneNumber());

        }
    }
}

package com.androidcodefinder.firebasephonenumberauth;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import com.google.firebase.auth.FirebaseAuth;

import com.google.firebase.auth.FirebaseUser;

public class MainActivity extends AppCompatActivity {

private FirebaseAuth mAuth;

private Button logout;

private TextView userPhoneNumber;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

logout = (Button)findViewById(R.id.button2);

userPhoneNumber = (TextView)findViewById(R.id.userPhoneNumber);

mAuth = FirebaseAuth.getInstance();

logout.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

mAuth.signOut();

redirect();

}

});

}

private void redirect(){

Intent notLoggedIn = new Intent(MainActivity.this,AuthActivity.class);

startActivity(notLoggedIn);

finish();

}

@Override

public void onStart() {

super.onStart();

// Check if user is signed in (non-null) and update UI accordingly.

FirebaseUser currentUser = mAuth.getCurrentUser();

if(currentUser==null){

Intent notLoggedIn = new Intent(MainActivity.this,AuthActivity.class);

startActivity(notLoggedIn);

finish();

}

else{

userPhoneNumber.setText("Verified number is- "+FirebaseAuth.getInstance().getCurrentUser().getPhoneNumber());

}

Send a verification code to the user’s phone

For sending verification code we will use the following code when user will press Send Code button in AuthActivity.java.

PhoneAuthProvider.getInstance().verifyPhoneNumber(
                        phoneNumber,        // Phone number to verify
                        60,                 // Timeout duration
                        TimeUnit.SECONDS,   // Unit of timeout
                        AuthActivity.this,
                        mCallBacks);

PhoneAuthProvider.getInstance().verifyPhoneNumber(

phoneNumber, // Phone number to verify

60, // Timeout duration

TimeUnit.SECONDS, // Unit of timeout

AuthActivity.this,

mCallBacks);

mCallbacks: This is our callback that will help us to know the code is sent or not. It has three methods.

onCodeSent(): This is called when the code is sent successfully. The first parameter here is our verification id that is sent. So we are storing it in our mVerificationId object.
onVerificationFailed(): This method is called when the verification is failed for some reasons, so here we are only displaying a simple toast.
onVerificationCompleted(): This method is called when the verification is completed. Here we have the PhoneAuthCredential Object which will give us the code if it is automatically detected

        mCallBacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
            @Override
            public void onVerificationCompleted(PhoneAuthCredential phoneAuthCredential) {

                signInWithPhoneAuthCredential(phoneAuthCredential);

            }

            @Override
            public void onVerificationFailed(FirebaseException e) {

                Toast.makeText(AuthActivity.this,"error in verification",Toast.LENGTH_LONG).show();

            }


            @Override
            public void onCodeSent(String verificationId,
                                   PhoneAuthProvider.ForceResendingToken token) {
                mVerificationId = verificationId;
                mResendToken = token;
                phoneLayout.setVisibility(View.GONE);
                codeLayout.setVisibility(View.VISIBLE);
            }

mCallBacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {

@Override

public void onVerificationCompleted(PhoneAuthCredential phoneAuthCredential) {

signInWithPhoneAuthCredential(phoneAuthCredential);

}

@Override

public void onVerificationFailed(FirebaseException e) {

Toast.makeText(AuthActivity.this,"error in verification",Toast.LENGTH_LONG).show();

}

@Override

public void onCodeSent(String verificationId,

PhoneAuthProvider.ForceResendingToken token) {

mVerificationId = verificationId;

mResendToken = token;

phoneLayout.setVisibility(View.GONE);

codeLayout.setVisibility(View.VISIBLE);

}

Verifying Code and Sign In – To verify verification code we will use signInWithPhoneAuthCredential() method. If the verification is successful we will let the user sign in into the application.
Firebase phone authentication have two features if user is using same number on the device it will auto detect the code and verify but if user want to verify other number which he is using on other phone he needs enter manually for that we are using one button.
Complete code for AuthActivity.java is-

package com.androidcodefinder.firebasephonenumberauth;

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

import java.util.concurrent.TimeUnit;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseException;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseAuthInvalidCredentialsException;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.PhoneAuthCredential;
import com.google.firebase.auth.PhoneAuthProvider;

public class AuthActivity extends AppCompatActivity {

    private EditText phoneText,codeText;
    private LinearLayout phoneLayout,codeLayout;
    private ProgressBar phoneBar,codeBar;
    private Button sendButton,verifyButton;

    private PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallBacks;

    private FirebaseAuth mAuth;

    private String mVerificationId;
    private PhoneAuthProvider.ForceResendingToken mResendToken;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_auth);

        mAuth = FirebaseAuth.getInstance();

        phoneText = (EditText)findViewById(R.id.phoneText);
        codeText = (EditText)findViewById(R.id.codeText);

        phoneLayout = (LinearLayout) findViewById(R.id.phoneLayout);
        codeLayout = (LinearLayout) findViewById(R.id.codeLayout);

        phoneBar = (ProgressBar)findViewById(R.id.phoneBar);
        codeBar = (ProgressBar)findViewById(R.id.codeBar);

        sendButton = (Button) findViewById(R.id.sendButton);
        verifyButton = (Button) findViewById(R.id.verifyButton);

        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                phoneBar.setVisibility(View.VISIBLE);
                phoneText.setEnabled(false);
                sendButton.setEnabled(false);

                String phoneNumber = phoneText.getText().toString();

                PhoneAuthProvider.getInstance().verifyPhoneNumber(
                        phoneNumber,        // Phone number to verify
                        60,                 // Timeout duration
                        TimeUnit.SECONDS,   // Unit of timeout
                        AuthActivity.this,
                        mCallBacks);

            }
        });

        //When you press verify code button

        verifyButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                codeBar.setVisibility(View.VISIBLE);
                String code = codeText.getText().toString();

                PhoneAuthCredential credential = PhoneAuthProvider.getCredential(mVerificationId, code);
                signInWithPhoneAuthCredential(credential);

            }
        });

        mCallBacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
            @Override
            public void onVerificationCompleted(PhoneAuthCredential phoneAuthCredential) {

                signInWithPhoneAuthCredential(phoneAuthCredential);

            }

            @Override
            public void onVerificationFailed(FirebaseException e) {

                Toast.makeText(AuthActivity.this,"error in verification",Toast.LENGTH_LONG).show();

            }


            @Override
            public void onCodeSent(String verificationId,
                                   PhoneAuthProvider.ForceResendingToken token) {
                mVerificationId = verificationId;
                mResendToken = token;
                phoneLayout.setVisibility(View.GONE);
                codeLayout.setVisibility(View.VISIBLE);
            }

        };

    }

    private void signInWithPhoneAuthCredential(PhoneAuthCredential credential) {
        mAuth.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

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

                            Intent LoggedIn = new Intent(AuthActivity.this,MainActivity.class);
                            startActivity(LoggedIn);
                            finish();
                            // ...
                        } else {
                            // Sign in failed, display a message and update the UI

                            Toast.makeText(AuthActivity.this,"error",Toast.LENGTH_LONG).show();

                            if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {
                                // The verification code entered was invalid
                            }
                        }
                    }
                });
    }
}

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package com.androidcodefinder.firebasephonenumberauth;

import android.content.Intent;

import android.support.annotation.NonNull;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.text.Layout;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.LinearLayout;

import android.widget.ProgressBar;

import android.widget.Toast;

import java.util.concurrent.TimeUnit;

import com.google.android.gms.tasks.OnCompleteListener;

import com.google.android.gms.tasks.Task;

import com.google.firebase.FirebaseException;

import com.google.firebase.auth.AuthResult;

import com.google.firebase.auth.FirebaseAuth;

import com.google.firebase.auth.FirebaseAuthInvalidCredentialsException;

import com.google.firebase.auth.FirebaseUser;

import com.google.firebase.auth.PhoneAuthCredential;

import com.google.firebase.auth.PhoneAuthProvider;

public class AuthActivity extends AppCompatActivity {

private EditText phoneText,codeText;

private LinearLayout phoneLayout,codeLayout;

private ProgressBar phoneBar,codeBar;

private Button sendButton,verifyButton;

private PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallBacks;

private FirebaseAuth mAuth;

private String mVerificationId;

private PhoneAuthProvider.ForceResendingToken mResendToken;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_auth);

mAuth = FirebaseAuth.getInstance();

phoneText = (EditText)findViewById(R.id.phoneText);

codeText = (EditText)findViewById(R.id.codeText);

phoneLayout = (LinearLayout) findViewById(R.id.phoneLayout);

codeLayout = (LinearLayout) findViewById(R.id.codeLayout);

phoneBar = (ProgressBar)findViewById(R.id.phoneBar);

codeBar = (ProgressBar)findViewById(R.id.codeBar);

sendButton = (Button) findViewById(R.id.sendButton);

verifyButton = (Button) findViewById(R.id.verifyButton);

sendButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

phoneBar.setVisibility(View.VISIBLE);

phoneText.setEnabled(false);

sendButton.setEnabled(false);

String phoneNumber = phoneText.getText().toString();

PhoneAuthProvider.getInstance().verifyPhoneNumber(

phoneNumber, // Phone number to verify

60, // Timeout duration

TimeUnit.SECONDS, // Unit of timeout

AuthActivity.this,

mCallBacks);

}

});

//When you press verify code button

verifyButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

codeBar.setVisibility(View.VISIBLE);

String code = codeText.getText().toString();

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

signInWithPhoneAuthCredential(credential);

}

});

mCallBacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {

@Override

public void onVerificationCompleted(PhoneAuthCredential phoneAuthCredential) {

signInWithPhoneAuthCredential(phoneAuthCredential);

}

@Override

public void onVerificationFailed(FirebaseException e) {

Toast.makeText(AuthActivity.this,"error in verification",Toast.LENGTH_LONG).show();

}

@Override

public void onCodeSent(String verificationId,

PhoneAuthProvider.ForceResendingToken token) {

mVerificationId = verificationId;

mResendToken = token;

phoneLayout.setVisibility(View.GONE);

codeLayout.setVisibility(View.VISIBLE);

}

};

}

private void signInWithPhoneAuthCredential(PhoneAuthCredential credential) {

mAuth.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

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

Intent LoggedIn = new Intent(AuthActivity.this,MainActivity.class);

startActivity(LoggedIn);

finish();

// ...

} else {

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

Toast.makeText(AuthActivity.this,"error",Toast.LENGTH_LONG).show();

if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {

// The verification code entered was invalid

}

});

}

That’s it now run your application and enjoy.
I have tried to my best to explain if you have any doubts feel free to comment below or mail me at csesumeet@gmail.com

Firebase Phone Number Authentication In Android Studio

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2 Comments

Jugendra Bhati says:

March 4, 2019 at 4:46 pm

Sir, Help Me
When I try to run application as shown in your tutorial the application make bug.
And show me RuntimeExcutation Error. I’m mention the hole report in the down :-

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jdgames.aum/com.jdgames.aum.MainActivity}: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.jdgames.aum. Make sure to call FirebaseApp.initializeApp(Context) first.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2723)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2784)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1523)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:163)
at android.app.ActivityThread.main(ActivityThread.java:6238)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.jdgames.aum. Make sure to call FirebaseApp.initializeApp(Context) first.
at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.4:240)
at com.google.firebase.auth.FirebaseAuth.getInstance(Unknown Source)
at com.jdgames.aum.MainActivity.onCreate(MainActivity.java:39)
at android.app.Activity.performCreate(Activity.java:6868)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2676)
… 9 more

This is the hole bug report.
I use all of your codes.

1. Sumeet Jain says:
  
  March 13, 2019 at 6:52 pm
  
  Follow the steps as i did in my blog add “Firebase” direct from your project.

Firebase Phone Number Authentication In Android Studio

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Send a verification code to the user’s phone

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