I'm trying to make and app login page using firebase phone authentication on android. I have successfully sent a phone number to firebase and also received an OTP code. But whenever I input the otp code and hit the verify button I get the error. Please help.
package com.saywhat.tabdemo;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseException;
import com.google.firebase.FirebaseTooManyRequestsException;
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;
import java.util.concurrent.TimeUnit;
public class Login extends AppCompatActivity {
EditText MobileNumber, OTPEditTextview;
Button Submit, OTPButton;
String countryCode = "+63";
TextView countryCodeTV, enterPhoneTV, Otp;
private boolean mVerificationInProgress = false;
private FirebaseAuth mAuth;
private static final String TAG = "PhoneLogin";
private String mVerificationId;
private PhoneAuthProvider.ForceResendingToken mResendToken;
private PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallbacks;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
MobileNumber = (EditText) findViewById(R.id.mobileNumber);
Submit = (Button) findViewById(R.id.submit);
OTPEditTextview = (EditText) findViewById(R.id.otp_editText);
OTPButton = (Button) findViewById(R.id.otp_button);
countryCodeTV = (TextView) findViewById(R.id.countryCode);
enterPhoneTV = (TextView) findViewById(R.id.enterPhone);
Otp = (TextView) findViewById(R.id.otp);
//mCallbacks - start
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);
Toast.makeText(Login.this, "Verification Completed", Toast.LENGTH_SHORT).show();
}
@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);
Toast.makeText(Login.this, "Verification Failed", Toast.LENGTH_SHORT).show();
if (e instanceof FirebaseAuthInvalidCredentialsException) {
// Invalid request
Toast.makeText(Login.this, "Invalid Phone Number", Toast.LENGTH_SHORT).show();
// ...
} else if (e instanceof FirebaseTooManyRequestsException) {
// The SMS quota for the project has been exceeded
Toast.makeText(Login.this, "SMS Quota Exceeded", Toast.LENGTH_SHORT).show();
// ...
}
// Show a message and update the UI
// ...
}
@Override
public void onCodeSent(String verificationId,
PhoneAuthProvider.ForceResendingToken token) {
// The SMS verification code has been sent to the provided phone number, we
// now need to ask the user to enter the code and then construct a credential
// by combining the code with a verification ID.
Log.d(TAG, "onCodeSent:" + verificationId);
Toast.makeText(Login.this, "Verification code sent", Toast.LENGTH_SHORT).show();
// Save verification ID and resending token so we can use them later
mVerificationId = verificationId;
mResendToken = token;
// Send Phone Number views - start
MobileNumber.setVisibility(View.GONE);
Submit.setVisibility(View.GONE);
countryCodeTV.setVisibility(View.GONE);
enterPhoneTV.setVisibility(View.GONE);
// Send Phone Number views - end
// Verify OTP views - start
Otp.setVisibility(View.VISIBLE);
OTPButton.setVisibility(View.VISIBLE);
OTPEditTextview.setVisibility(View.VISIBLE);
// Verify OTP views - end
// ...
}
};
//mCallbacks - end
Submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, countryCode + MobileNumber.getText().toString());
PhoneAuthProvider.getInstance().verifyPhoneNumber(
countryCode + MobileNumber.getText().toString(),
60,
TimeUnit.SECONDS,
Login.this,
mCallbacks);
}
});
OTPButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// PhoneAuthCredential credential = PhoneAuthProvider.getCredential(verificationId, code); - ORIGINAL
PhoneAuthCredential credential = PhoneAuthProvider.getCredential(mVerificationId, OTPEditTextview.getText().toString());
Log.d(TAG, OTPEditTextview.getText().toString());
Log.d(TAG, credential.toString());
signInWithPhoneAuthCredential(credential);
}
});
}
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
Log.d(TAG, "signInWithCredential:success");
Toast.makeText(Login.this, "Signing in", Toast.LENGTH_SHORT).show();
startActivity(new Intent(Login.this, com.saywhat.tabdemo.MainActivity.class));
FirebaseUser user = task.getResult().getUser();
// ...
} else {
// Sign in failed, display a message and update the UI
Log.w(TAG, "signInWithCredential:failure", task.getException());
if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {
// The verification code entered was invalid
Toast.makeText(Login.this, "Verification code invalid", Toast.LENGTH_SHORT).show();
}
}
}
});
}
}
My Logcat shows
22:23:06.441 8184-8184/com.saywhat.tabdemo E/AndroidRuntime: FATAL EXCEPTION: main Process: com.saywhat.tabdemo, PID: 8184 java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.tasks.Task com.google.firebase.auth.FirebaseAuth.signInWithCredential(com.google.firebase.auth.AuthCredential)' on a null object reference at com.saywhat.tabdemo.Login.signInWithPhoneAuthCredential(Login.java:155) at com.saywhat.tabdemo.Login.access$300(Login.java:27) at com.saywhat.tabdemo.Login$3.onClick(Login.java:145) at android.view.View.performClick(View.java:5702) at android.widget.TextView.performClick(TextView.java:10888) at android.view.View$PerformClick.run(View.java:22541) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:158) at android.app.ActivityThread.main(ActivityThread.java:7229) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
