Send-OTP using Java with Firebase Connectivity

By Akshay Kumar

A one-time password (OTP), also known as a one-time PIN or dynamic password, is a password that is valid for only one login session or transaction, on a computer system or other digital device.

Send OTP using Java with Firebase Connectivity

The first screen will be our Verification screen on which the user has to add his phone number. After adding his phone number, the user will click on the Get OTP button after that Firebase will send OTP on that number which is mentioned above. After receiving that OTP user has to enter that OTP in the below text filed and click on the below button to verify with entered OTP. After clicking on the verify button Firebase will verify that OTP and allow the user to enter into the home screen only when entered OTP is correct else the user will get an error message.

 

Step 1: To create a new project and select Java as the programming language.

Step 2: Connect our system to Firebase 

Step 3: Add permissions for the internet in our Manifest.xml file

now write the bellow code and run our program.

 

package com.example.verifiyotp;


import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.android.volley.Cache;
import com.android.volley.Network;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.BasicNetwork;
import com.android.volley.toolbox.DiskBasedCache;
import com.android.volley.toolbox.HurlStack;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.firebase.FirebaseException;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.PhoneAuthCredential;
import com.google.firebase.auth.PhoneAuthProvider;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import org.jetbrains.annotations.NotNull;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.concurrent.TimeUnit;

public class SendOtpActivity extends AppCompatActivity {
private EditText enternumber;
private Button getotp;
ProgressBar progressBar;
FirebaseAuth auth;


String url="http://clients.jprportal.com/sarju/api/user_login/?api_key=w0fp55cIdJ6lLuOqVEd251zKw6lnNd";




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

enternumber = findViewById(R.id.enterNumber);
getotp = findViewById(R.id.getotp);
progressBar = findViewById(R.id.prograssbars);

getData();

getotp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!enternumber.getText().toString().trim().isEmpty()) {
if (enternumber.getText().toString().trim().length() == 10) {
progressBar.setVisibility(View.VISIBLE);
enternumber.setVisibility(v.INVISIBLE);


PhoneAuthProvider.getInstance().verifyPhoneNumber("+91"+enternumber.getText().toString(), 60
, TimeUnit.SECONDS, SendOtpActivity.this, new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
@Override
public void onVerificationCompleted(@NonNull @org.jetbrains.annotations.NotNull PhoneAuthCredential phoneAuthCredential) {
progressBar.setVisibility(View.GONE);
enternumber.setVisibility(v.VISIBLE);
}

@Override
public void onVerificationFailed(@NonNull @org.jetbrains.annotations.NotNull FirebaseException e) {

progressBar.setVisibility(View.GONE);
enternumber.setVisibility(v.VISIBLE);
Toast.makeText(SendOtpActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();

}

@Override
public void onCodeSent(@NonNull @NotNull String backendotp, @NonNull @NotNull PhoneAuthProvider.ForceResendingToken forceResendingToken) {
Toast.makeText(SendOtpActivity.this, "Verify your OTP", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(SendOtpActivity.this, VerificationActivity.class);
intent.putExtra("mobile", enternumber.getText().toString());
intent.putExtra("backendotp", backendotp);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
});
} else {
Toast.makeText(SendOtpActivity.this, "Please enter correct number", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(SendOtpActivity.this, "Enter mobile number", Toast.LENGTH_SHORT).show();
}

}
});
}

private void getData() {

RequestQueue requestQueue= Volley.newRequestQueue(this);
JsonObjectRequest jsonObjectRequest=new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener() {
@Override
public void onResponse(JSONObject response) {

try {
Toast.makeText(SendOtpActivity.this, "status :"+response.getInt("status")
+"," +"message :"+response.getString("message"), Toast.LENGTH_SHORT).show();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {

Toast.makeText(SendOtpActivity.this, error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
requestQueue.add(jsonObjectRequest);

}
}

 

Output