I'm trying to achieve register a user in firestore and at the same time save the user's details into the firestore. I have successfully registered a user, but I'm unable to save the user information as a collection in Firebase I'm getting an error like the one below,
FATAL EXCEPTION: main Process: com.example.loginapp, PID: 4826 java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.firebase.firestore.CollectionReference com.google.firebase.firestore.FirebaseFirestore.collection(java.lang.String)' on a null object reference
Register.java
package com.example.loginapp;
import static android.content.ContentValues.TAG;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
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.android.material.textfield.TextInputEditText;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.FirebaseFirestore;
import java.util.HashMap;
import java.util.Map;
public class Register extends AppCompatActivity {
TextInputEditText editTextEmail,editTextPassword;
EditText nameEditText;
Button buttonReg;
ProgressBar progressBar;
TextView textView;
FirebaseAuth mAuth;
FirebaseFirestore fStore;
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 intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
finish();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
editTextEmail = findViewById(R.id.email);
editTextPassword = findViewById(R.id.password);
nameEditText = findViewById(R.id.regi_name);
buttonReg = findViewById(R.id.btn_register);
progressBar = findViewById(R.id.progressBar);
mAuth = FirebaseAuth.getInstance();
textView = findViewById(R.id.loginNow);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), Login.class);
startActivity(intent);
finish();
}
});
buttonReg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
progressBar.setVisibility(View.VISIBLE);
String email, password;
email = String.valueOf(editTextEmail.getText());
password = String.valueOf(editTextPassword.getText());
if (TextUtils.isEmpty(email)){
Toast.makeText(Register.this, "Enter Email | NO Email", Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)){
Toast.makeText(Register.this, "Enter Password", Toast.LENGTH_SHORT).show();
return;
}
mAuth.createUserWithEmailAndPassword(email, password)
.addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
progressBar.setVisibility(View.GONE);
if (task.isSuccessful()) {
Toast.makeText(Register.this, "Account successfully created",
Toast.LENGTH_SHORT).show();
// save the user details to DB
FirebaseUser user = mAuth.getCurrentUser();
FirebaseUser currentFirebaseUser = FirebaseAuth.getInstance().getCurrentUser() ;
DocumentReference df = fStore.collection("User").document(user.getUid());
Map<String, Object>userInfo = new HashMap<>();
userInfo.put("Name",nameEditText.getText().toString());
userInfo.put("UserEmail",editTextEmail.getText().toString());
// access level
userInfo.put("isAdmin", "0");
df.set(userInfo);
Intent intent = new Intent(getApplicationContext(), Login.class);
startActivity(intent);
finish();
} else {
// If sign in fails, display a message to the user.
Log.w(TAG, "createUserWithEmail:failure", task.getException());
Toast.makeText(Register.this, "Authentication failed.",
Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
}
activity_register.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:orientation="vertical"
android:padding="15dp"
android:gravity="center"
tools:context=".Register">
<TextView
android:text="@string/register"
android:textSize="28sp"
android:textStyle="bold"
android:gravity="center"
android:layout_marginBottom="15dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/regi_name"
android:hint="@string/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/email"
android:hint="@string/email"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/password"
android:hint="@string/password"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</com.google.android.material.textfield.TextInputLayout>
<ProgressBar
android:id="@+id/progressBar"
android:visibility="gone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/btn_register"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_register"
android:layout_margin="10dp"/>
<TextView
android:id="@+id/loginNow"
android:text="@string/click_to_login"
android:textSize="20sp"
android:textStyle="bold"
android:gravity="center"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
Can anyone help me with this?
