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How to switch between activities on Android using the Java programming language?

I want to make a login program using Firebase authentication using an email and password. First, I created a register page with the class name "RegisterActivity." When the user successfully registers, the user will then be thrown to the login page. Everything was running smoothly until I wrote the following code in the LoginActivity class.
mAuthListener = new FirebaseAuth.AuthStateListener() {
#Override
public void onAuthStateChanged(#NonNull FirebaseAuth firebaseAuth) {
// Check whether there are users who have logged in or not logged out.
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null){
Intent intent = new Intent(LoginActivity.this, HomeActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(intent);
finish();
}
}
};
After I apply the code above, when the user successfully registers on the register page, the user is automatically thrown to the home page instead of the login page again.
I know maybe I have to delete the code above, but if the code is deleted, then every time the user closes the application, the user will be asked to re-login. So, how do solve this issue without removing the preceding code?
This is the code snippet in the RegisterActivity class.
mAuth.createUserWithEmailAndPassword(email, password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
progressBar.setVisibility(View.GONE);
if (task.isSuccessful()){
Toast.makeText(RegisterActivity.this, "Register succces", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(RegisterActivity.this, LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}else{
Toast.makeText(RegisterActivity.this, "Register failed", Toast.LENGTH_SHORT).show();
}
}
});

why Unable to upload a picture on firebase storage?

There's a mistake in this code:
String download_url=task.getResult.getStorage.getDownloadUrl.toString);
When I run the program, I choose a picture from the gallery and I post it, and I get a message:
User is not authenticated, please authenticate using Firebase Authentication and try again
final StorageReference newPhoto=mPhotosStrorage.child(imageUri.getLastPathSegment());
newPhoto.putFile(imageUri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
#Override
public void onComplete(#NonNull Task<UploadTask.TaskSnapshot> task) {
if (task.isSuccessful())
{
final String myKey=mPhotosDatabase.push().getKey();
//this error String download_url=task.getResult().getDownloadUrl().toString();
String datem=getDateTime();
DatabaseReference newDatabase=mPhotosDatabase.child(myKey);
newDatabase.child("postid").setValue(myKey);
newDatabase.child("postedby").setValue(userId);
newDatabase.child("postedon").setValue(datem);
newDatabase.child("postdetails").setValue(post);
newDatabase.child("postlikes");
newDatabase.child("postviews");
newDatabase.child("postcomments");
newDatabase.child("postimage").setValue(download_url).addOnCompleteListener(new OnCompleteListener<Void>() {
#RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
#Override
public void onComplete(#NonNull Task<Void> task) {
if (task.isSuccessful())
{
pb.setVisibility(View.GONE);
Pair[] pairs=new Pair[1];
pairs[0]=new Pair<View,String>(homeLayout,"etTransition");
ActivityOptions options=ActivityOptions.makeSceneTransitionAnimation(PostActivity.this,pairs);
startActivity(new Intent(PostActivity.this,HomeActivity.class),options.toBundle());
}
}
});
}else {
Toast.makeText(PostActivity.this, "Error:"+task.getException().getMessage(), Toast.LENGTH_SHORT).show();
}
}
});
Please help solve it and rewrite the code for me.

According to your last comment, the problem is at the following line of code:
String download_url=task.getResult().getDownloadUrl().toString();
Please note that this is not how you get the download URL nowadays. Converting that Task object to String isn't helpful at all. To solve this, please use the following lines of code:
storageRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
#Override
public void onSuccess(Uri uri) {
String url = uri.toString();
//Do what you need to do with the URL
}
});
Besides that, always make sure to have the user authenticated, as that error occurs only when the user is not authenticated and the rules are set to reject the operations.

Why is firebase failing to create a new user?

I am trying to make it so that the user can enter in various importation and that firebase can enter this information into the Runtime DB. However, when I press the button that makes the code below happen, it results in the progress bar loading forever. I tried throwing in the log to try to catch some exception, but no exceptions came up. On the firebase console, the user was not created in the authentication and nothing was added to the RunTime DB. I am not sure what is causing this to happen, and I would appreciate any and all help.
Code:
User user = new User(fullName, email, bio, username,location,realstatus,profilePic);
FirebaseDatabase db = FirebaseDatabase.getInstance();
DatabaseReference root = db.getReference().child("Users");
progressBar.setVisibility(ViewStub.VISIBLE);
mAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if(task.isSuccessful()) {
Toast.makeText(Register.this, "Create User Succeeded", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(Register.this, "Failed to Authenticate :( ", Toast.LENGTH_SHORT).show();
}
}
});
root.push().setValue(user).addOnCompleteListener(new OnCompleteListener<Void>() {
#Override
public void onComplete(#NonNull Task<Void> task) {
if(task.isSuccessful()) {
progressBar.setVisibility(ViewStub.GONE);
Toast.makeText(Register.this, "Data Saved", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(Register.this, "Failed to Register User :( ", Toast.LENGTH_SHORT).show();
Log.e("Create user", "Failed to create user", task.getException());
}
}
});
Error:
com.google.firebase.FireBaseException:
An internal error has occured. [ socket failed EPERM:(Operation not permitted) ]

Add a completion listener to the createUser so you can know why it isn't working.
mAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(LoginActivity.this, task -> {
binding.progressBar.setVisibility(View.GONE);
if (!task.isSuccessful()) {
//get the error here with task.toString();
} else {
save your database data here
}
});
That will at least help you get to the bottom of why it is failing. Also make sure you have
enabled email auth in firebase console
Have properly set up your app, the SHA-1s, the google-services json and all

Firebase not firing a success or unsuccess

I've followed the instructions exactly, in fact, I even used the code from the Firebase helper in android studio. My issue is as such, nor login or failure to login is occurring with my code! What am I missing?
public void toSubscribe(View v) {
Log.d("OK", "this part first");
String strUsername, strPassword;
strUsername = ((EditText) findViewById(R.id.username)).getText().toString();
strPassword = ((EditText) findViewById(R.id.password)).getText().toString();
if (strUsername.matches("")) {
Toast.makeText(MainActivity.this, "You did not enter a username.", Toast.LENGTH_SHORT).show();
return;
}
if (strPassword.matches("")) {
Toast.makeText(MainActivity.this, "You did not enter a password.", Toast.LENGTH_SHORT).show();
return;
}
mAuth.signInWithEmailAndPassword(strUsername, strPassword)
.addOnCompleteListener(MainActivity.this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
Log.d("TAG", "signInWithEmail:onComplete:" + task.isSuccessful());
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
Log.w("TAG", "signInWithEmail", task.getException());
Toast.makeText(MainActivity.this, "Authentication failed.",
Toast.LENGTH_SHORT).show();
}
}
});
}
Not much else to say... I tried using a new JSON file and it still doesn't work. I've Googled tons of stuff but nothing really worked.

please check the following:
1-you install and add Gson file correctly from firebase console
2- you enable firebase authentication from firebase console
3- you mAuth initialized correctly

Firebase reflect changes directly from database?

In my Firebase application I created a fragment that allows users to update their information like namn & email and so far all is going well, however my issue is after the user have updated the information - the changes are not visible untill next relaunch of the application.
How can I reflect the changes directly from the databse without promoting the User to relaunch the app?
I have created a Method called restart(); that will like the name says says restart the application - But still the changes are not being reflected!
/**
* Update Name Only
*/
private void updateDisplayNameOnly() {
showProgress();
AuthCredential credential = EmailAuthProvider
.getCredential(FirebaseAuth.getInstance().getCurrentUser().getEmail(), mConfirm.getText().toString());
FirebaseAuth.getInstance().getCurrentUser().reauthenticate(credential)
.addOnCompleteListener(new OnCompleteListener<Void>() {
#Override
public void onComplete(#NonNull Task<Void> task) {
if (task.isSuccessful()) {
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
UserProfileChangeRequest profileUpdate = new UserProfileChangeRequest.Builder()
.setDisplayName(mName.getText().toString())
//.setPhotoUri(Uri.parse("https://avatarfiles.alphacoders.com/862/86285.jpg"))
.build();
user.updateProfile(profileUpdate);
Log.d(TAG, "onComplete: User Profile updated");
Toast.makeText(getActivity(), "Name is updated", Toast.LENGTH_SHORT).show();
restartApp();
} else {
Toast.makeText(getActivity(), "Name was not updated", Toast.LENGTH_SHORT).show();
}
hideProgress();
}
})
.addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
hideProgress();
Toast.makeText(getActivity(), "You have entered wrong password", Toast.LENGTH_SHORT).show();
}
});
}
Restart Method
public void restartApp() {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
finish();
}

Firebase has a listener onDataChange(), so when you query data from firebase, make sure you implement that, see doc. If you want to reflect the change, implement it in this method (like resetting the text fields). There is no need for a restart method.

Update profile call is asynchronous, and its results are not available immediately, so for some time you'll still observe "obsolete" data.
When you call updateProfile, you get a task as a result. You can subscribe on completion of this task, and if it's completed successfully, then you will be able to get updated data from user instance. E.g.:
final FirebaseUser currentUser = FirebaseAuth.getInstance().getCurrentUser();
Log.i("MyActivity", "before updateProfile: username=" + currentUser.getDisplayName());
UserProfileChangeRequest profileUpdate = new UserProfileChangeRequest.Builder()
.setDisplayName("UPDATED_NAME")
.build();
final Task<Void> task = currentUser.updateProfile(profileUpdate);
Log.i("MyActivity", "after updateProfile: username=" + currentUser.getDisplayName());
task.addOnCompleteListener(new OnCompleteListener<Void>() {
#Override
public void onComplete(#NonNull Task<Void> task) {
Log.i("MyActivity", "onComplete: username=" + currentUser.getDisplayName());
}
});
And here is an output:
I/MyActivity: before updateProfile: username=old name
I/MyActivity: after updateProfile: username=old name
I/MyActivity: onComplete: username=UPDATED_NAME
Also there is a method user.reload(), which force reload user data from Firebase server. This is useful when your client user cache is obsolete for some reason. It is also an asynchronous method, which gives you Task and you need to subscribe on its completion.