=>signup wih Firebase and go to console
=>create a google-service.json file with your proper packagename
=>download and keep your google-service.json in app folder of your app
1. Adding in build.gradle (Module):
Add dependencies :
implementation 'com.google.firebase:firebase-auth:11.8.0'
implementation platform('com.google.firebase:firebase-bom:28.2.1')
implementation 'com.google.firebase:firebase-analytics'
Add plugin :
plugins {
id 'com.android.application'
}
2. Create text boxes for username and password, Button for signup and Login:
Signup validation
1.Check whether text boxes are not empty
==>get string :
String email=emailId.getText().toString();
String pass=password.getText().toString();
==>validate the string :
if(email.isEmpty()){
emailId.setError("Please enter emailid");
emailId.requestFocus();
}else if(pass.isEmpty()){
password.setError("Please enter password");
password.requestFocus();
}else if(email.isEmpty() && pass.isEmpty()){
Toast.makeText(act3.this,"Fields are empty",Toast.LENGTH_SHORT).show();
}else if(!(email.isEmpty() && pass.isEmpty())){
==>==>using firebase Auth createUserWithEmailAndPassword and addOnCompleteListener
mFirebaseAuth.createUserWithEmailAndPassword(email,pass).addOnCompleteListener(act3.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(Task<AuthResult> task) {
if(!task.isSuccessful()){
Toast.makeText(act3.this,"Signup error, please Try Again",Toast.LENGTH_SHORT).show();
}else{
startActivity(new Intent(act3.this,homeActivity.class));
}
}
});
}else{
Toast.makeText(act3.this,"Error Occurred",Toast.LENGTH_SHORT).show();
}
}
2. For Login
declare mAuthStateListener Object
private FirebaseAuth.AuthStateListener mAuthStateListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fblogin);
mFirebaseAuth =FirebaseAuth.getInstance();
emailId=findViewById(R.id.email);
password=findViewById(R.id.password);
btnsignIn=findViewById(R.id.signin);
tvsignIn=findViewById(R.id.textView2);
//===>creating a Firebase Auth listener
mAuthStateListener = new FirebaseAuth.AuthStateListener() {
// check for session using onAuthStateChanged
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser mFirebaseUser=mFirebaseAuth.getCurrentUser();
if(mFirebaseUser!=null){
Toast.makeText(fblogin.this,"logged in", Toast.LENGTH_SHORT).show();
Intent i =new Intent(fblogin.this, homeActivity.class);
startActivity(i);
}else{
Toast.makeText(fblogin.this,"Please Login", Toast.LENGTH_SHORT).show();
}
}
};
// signin Listener
btnsignIn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String email=emailId.getText().toString();
String pass=password.getText().toString();
//validating listener
if(email.isEmpty()){
emailId.setError("Please enter emailid");
emailId.requestFocus();
}else if(pass.isEmpty()){
password.setError("Please enter password");
password.requestFocus();
}else if(email.isEmpty() && pass.isEmpty()){
Toast.makeText(fblogin.this,"Fields are empty",Toast.LENGTH_SHORT).show();
}else if(!(email.isEmpty() && pass.isEmpty())){
//signin with username and password
mFirebaseAuth.signInWithEmailAndPassword(email,pass).addOnCompleteListener(fblogin.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if(!task.isSuccessful()){
Toast.makeText(fblogin.this,"Login Error Occurred, Please Try again",Toast.LENGTH_SHORT).show();
}else{
Intent i =new Intent(fblogin.this, homeActivity.class);
startActivity(i);
}
}
});
}else{
Toast.makeText(fblogin.this,"Error Occurred",Toast.LENGTH_SHORT).show();
}
}
});
tvsignIn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent =new Intent(fblogin.this, fb.class);
startActivity(intent);
}
});
}
@Override
protected void onStart(){
super.onStart();
mFirebaseAuth.addAuthStateListener(mAuthStateListener);
}
Logout Script:
in some home page
signout=findViewById(R.id.signout);
signout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FirebaseAuth.getInstance().signOut();
Intent i=new Intent(home.this, fblogin.class);
startActivity(i);
}
});
