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My horizontalscrollview does not dynamically populate elements when my button is pressed

I have a horizontalScrollView in my android app that I am trying to dynamically put a cardview with an imageView and a textView inside of the Horizontal scrollView when a button is pressed. When my app is first started up you see just a button named on the bottom of the app "findCar". When the button is pressed a method called buildCarView is called tha should put a cardView, textview and another button inside the upper portion of the screen (above the findCar button). But for some reason when i press the button nothing appears even though when I debug it the method to inflate the View is being called and the cardview/textView and the other button is being populated.
Here are the two XML's
This is the first thing you see when you open the app. It called dailouge_container.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<Button
android:id="#+id/find_car_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="4dp"
android:layout_marginLeft="4dp"
android:layout_marginBottom="292dp"
android:text="Find Car"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/scrollView"
app:layout_constraintVertical_bias="0.0" />
<HorizontalScrollView
android:id="#+id/scrollView"
android:layout_width="310dp"
android:layout_height="300dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="#+id/container"
android:orientation="horizontal"></LinearLayout>
</HorizontalScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
Below is the XML am trying to dynamically add when the button findCar its called Card.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView android:layout_width="280dp"
android:layout_height="230dp"
android:id="#+id/cardView"
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<ImageView
android:id="#+id/imageViewScroll"
android:layout_width="270dp"
android:layout_height="90dp"
/>
<TextView
android:id="#+id/price"
android:layout_width="270dp"
android:layout_height="50dp"
android:text="Price"
android:textSize="25dp">
</TextView>
<TextView
android:id="#+id/makeandmodel"
android:layout_width="270dp"
android:layout_height="50dp"
android:text="Make and Model"
android:textSize="22dp">
</TextView>
<Button
android:id="#+id/rentCarButton"
android:layout_width="270dp"
android:layout_height="35dp"
android:layout_marginBottom="4dp"
android:text="Rent Car"
android:textColor="#color/cardview_dark_background"
android:textSize="14dp"
></Button>
</LinearLayout>
</androidx.cardview.widget.CardView>
Below is what im doing in the OnCreate
LinearLayout linearLayout;
HorizontalScrollView horizontalScrollView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dialoge_container);
mAuth = FirebaseAuth.getInstance();
FirebaseUser currentUser = mAuth.getCurrentUser();
userId = currentUser.getUid();
DatabaseReference lendersToRentFrom = FirebaseDatabase.getInstance().getReference().child("Users").child("Lenders");
GeoFire geoFire = new GeoFire(lendersToRentFrom);
horizontalScrollView = findViewById(R.id.scrollView);
linearLayout = findViewById(R.id.container);
linearLayout.setOrientation(LinearLayout.HORIZONTAL);
Below is the findCar method that should dynamically add the cardView/textveiw and other button the horizontal scrollView
public void buildCardView(){
View view = getLayoutInflater().inflate(R.layout.card,null);
CardView cardView = view.findViewById(R.id.cardView);
Button rentCarButton = view.findViewById(R.id.rentCarButton);
TextView price= view.findViewById(R.id.price);
TextView makeandmodel = view.findViewById(R.id.makeandmodel);
ImageView imageView =view.findViewById(R.id.imageViewScroll);
linearLayout.addView(view);
}

set.Visibility(View.GONE) not making the Button and EditText gone, and it's showing up like I didn't even add the code

Trying to make two login, one for admin, one for user. They share the same layout, but admin has additional TextFields and Buttons to add data to the menu. So when logging in with user credentials, the TextFields and Buttons will be setVisibility(View.GONE), but it's not working at all, in fact it's showing up like setVisibility(View.GONE) was added at all. Any advice would be appreciated.
loginpage.java
DatabaseHelper myDB;
EditText LoginEMail;
EditText LoginPassword;
Button LoginBtn;
LinearLayout linearLayout;
View add_image;
View add_name;
View add_desc;
View add_data;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.loginpage);
LoginEMail = findViewById(R.id.LoginEMail);
LoginPassword = findViewById(R.id.LoginPassword);
LoginBtn = findViewById(R.id.LoginBtn);
myDB = new DatabaseHelper(this);
linearLayout = findViewById(R.id.linearLayout);
linearLayout = new LinearLayout(this);
add_image = new View(this);
add_name = new View(this);
add_desc = new View(this);
add_data = new View(this);
}
public void Login(View view) {
Intent intent = new Intent(loginpage.this, MenuSelection.class);
if (LoginEMail.getText().toString().equals("admin") && (LoginPassword.getText().toString().equals("admin"))) {
startActivity(intent);
linearLayout.setVisibility(View.VISIBLE);
}
else if(LoginEMail.getText().toString().equals("user") && (LoginPassword.getText().toString().equals("user"))) {
startActivity(intent);
linearLayout.setVisibility(View.GONE);
add_image.setVisibility(View.GONE);
add_name.setVisibility(View.GONE);
add_desc.setVisibility(View.GONE);
add_data.setVisibility(View.GONE);
}
else
Toast.makeText(loginpage.this, "Incorrect E-mail or Password.", Toast.LENGTH_SHORT).show();
}
loginpage.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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">
<EditText
android:id="#+id/LoginEMail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="E-Mail"
android:inputType="textEmailAddress"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.504"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.204" />
<EditText
android:id="#+id/LoginPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Password"
android:inputType="textPassword"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.495"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.338" />
<Button
android:id="#+id/LoginBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Log In"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.502"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.602"
android:onClick="Login"/>
</androidx.constraintlayout.widget.ConstraintLayout>
menu_selection.xml
<androidx.constraintlayout.widget.ConstraintLayout
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:gravity="center_horizontal"
android:orientation="vertical">
<ListView
android:id="#+id/menu_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0">
<ImageButton
android:id="#+id/add_image"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="#color/black" />
<EditText
android:id="#+id/add_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Name" />
<EditText
android:id="#+id/add_desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Description" />
<Button
android:id="#+id/add_data"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

Instead of add_image = new View(this); you need to associate the variable add_image to the view in your XML layout using the findViewById(R.id.add_image) method. Similarly for the other 3 views that you have initialized this way.
You also need to delete the line linearLayout = new LinearLayout(this);. The previous line setting this variable is correct.

Constraint layout has space bottom and top

I'm building an app using Constraint layout, but it has extra space bottom and top. I can't find where they come from. I checked maybe ten times from top to bottom all code but there is no margin or padding or anything else for it.
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="#+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/black"
android:paddingLeft="0dp"
android:paddingTop="0dp"
android:paddingRight="0dp"
android:paddingBottom="0dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/Brand"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toTopOf="#id/guideline"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="#+id/brandname"
style="#style/viewParent.headerText"
android:text="Did"
android:textColor="#color/white" />
<TextView
android:id="#+id/brandname2"
style="#style/viewParent.headerText2"
android:layout_toRightOf="#id/brandname"
android:text="You"
android:textColor="#color/yellow" />
<TextView
style="#style/viewParent.headerText2"
android:layout_toRightOf="#id/brandname2"
android:text="Know!"
android:textColor="#color/red"
android:textStyle="bold|italic" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/container_main"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="4dp"
android:background="#drawable/card_bg"
android:paddingLeft="16dp"
android:paddingRight="16dp"
app:layout_constraintBottom_toTopOf="#id/guideline2"
app:layout_constraintEnd_toEndOf="#id/guidelineyazisag"
app:layout_constraintStart_toStartOf="#id/guidelineyazisol"
app:layout_constraintTop_toBottomOf="#id/guideline">
<TextView
android:id="#+id/activity_main_text_view_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="simple Title Text"
android:textColor="#5E4C4C"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/activity_main_did_u_know"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="Category"
android:textColor="#5E4C4C"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.core.widget.NestedScrollView
android:id="#+id/scrollview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:fillViewport="true"
app:layout_constraintBottom_toTopOf="#id/activity_main_image_view"
app:layout_constraintTop_toBottomOf="#id/activity_main_did_u_know">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="#id/activity_main_image_view"
app:layout_constraintTop_toBottomOf="#id/activity_main_did_u_know">
<TextView
android:id="#+id/factTextView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="8dp"
android:gravity="center_vertical|center_horizontal"
android:lineSpacingExtra="8dp"
android:padding="10dp"
android:text="Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged."
android:textColor="#000000"
android:textSize="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
<ImageView
android:id="#+id/activity_main_image_view"
android:layout_width="30dp"
android:layout_height="40dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:clickable="true"
android:src="#drawable/ic_share_black_24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/scrollview" />
<ImageView
android:id="#+id/activity_main_fav_button"
android:layout_width="30dp"
android:layout_height="40dp"
android:layout_margin="16dp"
android:clickable="true"
android:src="#drawable/ic_favorite_border_black_24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/scrollview" />
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/LeftRight"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toTopOf="#id/adView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/guideline2">
<ImageView
android:id="#+id/activity_main_left_button"
android:layout_width="60dp"
android:layout_height="60dp"
android:clickable="true"
android:src="#drawable/ic_previous"
android:elevation="3dp"
android:background="#drawable/okarka"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#id/guideline3"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/activity_main_right_button"
android:layout_width="60dp"
android:layout_height="60dp"
android:clickable="true"
android:src="#drawable/ic_next"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
android:background="#drawable/okarka"
app:layout_constraintStart_toEndOf="#+id/guideline3"
app:layout_constraintTop_toTopOf="parent" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.5" />
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="#+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111"
ads:layout_constraintBottom_toBottomOf="parent"
ads:layout_constraintLeft_toLeftOf="parent"
ads:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/LeftRight" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.076" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.7" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guidelineyazisol"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.07" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guidelineyazisag"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.93" />
</androidx.constraintlayout.widget.ConstraintLayout>
I tried adding guidelines to 0 points in the bottom but it also starts in that space. I gave -(minus) values to margin and padding but doesn't work. I don't know what else to do. You can see from screenshots how it looks.
public class MainActivity extends AppCompatActivity {
private ColorWheel colorWheel = new ColorWheel();
private TextView factTextView;
private TextView textViewId;
private TextView textViewTableName;
ImageView tableImageView;
AdView adView;
ImageView shareImageView;
ImageView favImageView;
float x1,x2,y1,y2;
int i = 1;
int adCounter = 0;
private ConstraintLayout constraintLayout;
String fact;
ArrayList<Fact> favList = new ArrayList<>();
private InterstitialAd mInterstitial;
AdRequest interAdRequest;
int favId;
String favTable;
Typeface typeface;
List<Fact> mData;
private DatabaseFacts db;
GradientDrawable shape;
#SuppressLint({"ClickableViewAccessibility", "SetTextI18n"})
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
db = new DatabaseFacts(this);
db.copyDbIfNotExists();
shape = new GradientDrawable();
shape.setCornerRadius(40);
mData = new ArrayList<>();
MobileAds.initialize(this, "ca-app-pub-2469721886989416~7390658870");
adView = findViewById(R.id.adView);
AdRequest bannerAdRequest = new AdRequest.Builder().build();
adView.loadAd(bannerAdRequest);
interAdRequest = new AdRequest.Builder().build();
mInterstitial = new InterstitialAd(this);
mInterstitial.setAdUnitId("ca-app-pub-2469721886989416/9441000894");
mInterstitial.loadAd(interAdRequest);
factTextView = findViewById(R.id.factTextView);
constraintLayout = (ConstraintLayout) findViewById(R.id.container_main);
textViewId = findViewById(R.id.activity_main_text_view_id);
favImageView = findViewById(R.id.activity_main_fav_button);
shareImageView = findViewById(R.id.activity_main_image_view);
textViewTableName = findViewById(R.id.activity_main_did_u_know);
// tableImageView = findViewById(R.id.img_user);
// if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
// typeface = getResources().getFont(R.font.sourceserifproregular);
// }
factTextView.setTypeface(typeface);
Intent intent = getIntent();
final int choice = intent.getIntExtra("choice",0);
switch (choice) {
case 1:
textViewTableName.setText("General Facts");
factTextView.setText(db.getFact((readFromShared("defaultKey") - 1), DatabaseFacts.TABLE_GENERAL_NAME).getFact());
textViewId.setText("Fact " + (readFromShared("defaultKey") - 1) + " of " + db.getFactsCount(DatabaseFacts.TABLE_GENERAL_NAME));
if (db.getFact((readFromShared("defaultKey") - 1), DatabaseFacts.TABLE_GENERAL_NAME).isFavorite() == 0) {
favImageView.setImageResource(R.drawable.ic_favorite_border_black_24dp);
} else {
favImageView.setImageResource(R.drawable.ic_favorite_black_24dp);
}
ImageView leftClick = (ImageView) findViewById(R.id.activity_main_left_button);
leftClick.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
leftClickMethod("defaultKey", DatabaseFacts.TABLE_GENERAL_NAME);
}
});
ImageView rightClick = (ImageView) findViewById(R.id.activity_main_right_button);
rightClick.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
rightClickMethod("defaultKey",DatabaseFacts.TABLE_GENERAL_NAME);
return;
}
});
favImageView.setOnClickListener(v -> handleFavorites("defaultKey", DatabaseFacts.TABLE_GENERAL_NAME));
break;

Remove app:layout_constraintBottom_toTopOf="#id/guideline" from Brand and app:layout_constraintTop_toBottomOf="#id/LeftRight" from adView. You can't put constraints for Top and Bottom because it will center your View between those two constraints. Same about left and right (start, end), but you have match_parent here, so this problem doesn't occur (visualy - if you set wrap_content, view will go to the center too).

EditText doesn't update its text

EDIT2:
Using
fragTransaction.add(fragment, tag);
instead of
fragTransaction.add(id, fragment);
OR
Removing all Fragments code in MainActivity makes the app works again, for some odd reason.
Getting the text via .getText().toString() returns null/empty when button is pressed.
Tried to manually .setText("something"), it works when .getText().toString() is called but,
when the text is modified, calling .getText().toString() will still return "something".
MainActivity.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragTransaction = fragmentManager.beginTransaction();
Fragment loginFrag = new LoginFragment();
fragTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out);
fragTransaction.add(R.id.mainFrag, loginFrag);
fragTransaction.commit();
}
LoginFragment.java
public class LoginFragment extends Fragment{
EditText fieldID;
EditText fieldPassword;
Button logButton;
private FirebaseAuth mAuth;
View view;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.login_menu, container, false);
}
#Override
public void onViewCreated(View v, Bundle savedInstanceState) {
super.onViewCreated(v, savedInstanceState);
mAuth = FirebaseAuth.getInstance();
view = v;
fieldID = v.findViewById(R.id.fieldID);
fieldPassword = v.findViewById(R.id.fieldPassword);
logButton = v.findViewById(R.id.button_login);
logButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
signIn(fieldID.getText().toString(), fieldPassword.getText().toString());
}
});
}
private void signIn(String email, String password) {
System.out.println("Email: " + email);
System.out.println("Pass: " + password);
if(!email.isEmpty() && !password.isEmpty()) {
mAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(getActivity(), 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("Auth", "signInWithEmail:success");
FirebaseUser user = mAuth.getCurrentUser();
//updateUI(user);
view.findViewById(R.id.logoMain).setVisibility(View.GONE);
} else {
// If sign in fails, display a message to the user.
Log.w("Auth", "signInWithEmail:failure", task.getException());
//updateUI(null);
}
}
});
}
}
}
Main Activity
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".presenter.Activity.MainActivity">
<fragment
android:id="#+id/mainFrag"
android:name="com.raze.mfa.presenter.Fragment.LoginFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Fragment Layout
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:background="#FFFFFF"
android:orientation="vertical">
<ImageView
android:id="#+id/imageView2"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="110dp"
android:adjustViewBounds="true"
android:scaleType="fitXY"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/logoMain"
app:layout_constraintVertical_bias="1.0"
app:srcCompat="#drawable/bak"
tools:srcCompat="#drawable/bak" />
<ImageView
android:id="#+id/iconlock"
android:layout_width="43dp"
android:layout_height="43dp"
android:layout_marginStart="8dp"
android:layout_marginTop="28dp"
android:layout_marginEnd="8dp"
app:layout_constraintEnd_toStartOf="#+id/fieldPassword"
app:layout_constraintHorizontal_bias="0.523"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/iconuser"
app:srcCompat="#mipmap/lockicon" />
<ImageView
android:id="#+id/iconuser"
android:layout_width="43dp"
android:layout_height="43dp"
android:layout_marginStart="8dp"
android:layout_marginTop="320dp"
android:layout_marginEnd="8dp"
app:layout_constraintEnd_toStartOf="#+id/fieldID"
app:layout_constraintHorizontal_bias="0.522"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#mipmap/usericon" />
<Button
android:id="#+id/button_login"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="#string/loginText"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/fieldPassword"
app:layout_constraintVertical_bias="0.188" />
<EditText
android:id="#+id/fieldPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:layout_marginEnd="72dp"
android:autofillHints=""
android:ems="10"
android:hint="#string/password"
android:inputType="textPassword"
android:singleLine="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#+id/fieldID" />
<EditText
android:id="#+id/fieldID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="320dp"
android:layout_marginEnd="72dp"
android:autofillHints=""
android:ems="10"
android:hint="#string/email"
android:inputType="textEmailAddress"
android:singleLine="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/logoMain"
android:layout_width="128dp"
android:layout_height="128dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="108dp"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
app:layout_constraintBottom_toTopOf="#+id/fieldID"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0"
app:srcCompat="#drawable/logoimg" />
<Button
android:id="#+id/button_register"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="#string/register"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button_login"
app:layout_constraintVertical_bias="0.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
Unrelated:
I've Googled mostly everything but it seems that I haven't understand the basics of using Fragments, Activites, context, Views, and etc.

Ok I see, you are using a <fragment/> tag already in your MainActivity layout, and then you add with the FragmentTransaction a fragment to it.
The transaction is for FrameLayout containers that are empty and take a fragment. When you add the fragment statically through the <fragment/> tag the fragment is already loaded into the screen.
Something weird was happening when you added a new fragment to a fragment tag, maybe it duplicated the fragment and it was reading the one that is behind the actual fragment and it wasn't getting the input from the user.
Read here for the proper use of FragmentTransaction: https://developer.android.com/training/basics/fragments/fragment-ui
Taken from the docs above, see how they use a FrameLayout as the container.
XML:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
Java:
public class MainActivity extends FragmentActivity {
#Override
public void onCreate(Bundle savedInstanceState?) {
super.onCreate(savedInstanceState);
setContentView(R.layout.news_articles);
// Check that the activity is using the layout version with
// the fragment_container FrameLayout
if (findViewById(R.id.fragment_container) != null) {
// However, if we're being restored from a previous state,
// then we don't need to do anything and should return or else
// we could end up with overlapping fragments.
if (savedInstanceState != null) {
return;
}
// Create a new Fragment to be placed in the activity layout
HeadlinesFragment firstFragment = new HeadlinesFragment();
// In case this activity was started with special instructions from an
// Intent, pass the Intent's extras to the fragment as arguments
firstFragment.setArguments(getIntent().getExtras());
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container, firstFragment).commit();
}
}
}

How to handle multiple intents on same activity?

Okay, I simply want to have multiple intents passing data into a single activity which will summarise all the user inputs into a nice easy to read form.
This is for a mock up school application form.
The following code works fine but will produce two activities: One showing the student's gender and one showing the students name. How to get it to display both in the same activity? Pulling my hair out over this!!
XML of studentInfoActivity:
<android.support.constraint.ConstraintLayout
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:background="#android:color/background_light"
tools:context=".studentInfoActivity">
<TextView
android:id="#+id/textView4"
android:layout_width="143dp"
android:layout_height="42dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="90dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:gravity="center"
android:text="Student Full Name"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView5"
android:layout_width="143dp"
android:layout_height="42dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:gravity="center"
android:text="Gender"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textInputLayout" />
XML of reviewScreenActivity:
<android.support.constraint.ConstraintLayout
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"
tools:context=".reviewScreenActivity">
<TextView
android:id="#+id/textView15"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="SUMMARY:"
android:textSize="30sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/summaryStudentFamilyName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="150dp"
android:layout_marginRight="150dp"
android:text="The student's name is: "
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView15" />
<TextView
android:id="#+id/summaryStudentGender"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="68dp"
android:layout_marginEnd="150dp"
android:layout_marginRight="150dp"
android:text="The student's gender is: "
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView15" />
<TextView
android:id="#+id/studentFullNameReviewScreen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="85dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="TextView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/summaryStudentFamilyName"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/studentGenderReviewScreen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="TextView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/summaryStudentGender"
app:layout_constraintTop_toBottomOf="#+id/studentFullNameReviewScreen" />
</android.support.constraint.ConstraintLayout>
Java code of studentInfoActivity:
public class studentInfoActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student_info);
//TAKEN FROM https://stackoverflow.com/questions/13377361/how-to-create-a-drop-down-list.
//AUTHOR: NICOLAS TYLER
//get the spinner from the xml.
Spinner dropdown = findViewById(R.id.genderSpinner);
//create a list of items for the spinner.
String[] items = new String[]{"Male", "Female", "Other"};
//create an adapter to describe how the items are displayed, adapters are used in several places in android.
//There are multiple variations of this, but this is the basic variant.
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, items);
//set the spinners adapter to the previously created one.
dropdown.setAdapter(adapter);
//TAKEN FROM https://stackoverflow.com/questions/13377361/how-to-create-a-drop-down-list.
//AUTHOR: NICOLAS TYLER
//get the spinner from the xml.
Spinner atsiDropdown = findViewById(R.id.atisSpinner);
//create a list of items for the spinner.
String[] atsiItems = new String[]{"Yes", "No"};
//create an adapter to describe how the items are displayed, adapters are used in several places in android.
//There are multiple variations of this, but this is the basic variant.
ArrayAdapter<String> atsiAdapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, atsiItems);
//set the spinners adapter to the previously created one.
atsiDropdown.setAdapter(atsiAdapter);
}
public void createCaregiverInfoSplash(View v){
//Send Student Full Name
EditText studentFullNameInput = (EditText) findViewById(R.id.studentFullNameInput);
String studentFullName = studentFullNameInput.getText().toString();
Intent studentIntent = new Intent(studentInfoActivity.this, reviewScreenActivity.class);
studentIntent.putExtra("studentFullName", studentFullName);
startActivity(studentIntent);
//Send Student Gender
Spinner genderSpinner = (Spinner) findViewById(R.id.genderSpinner);
String studentGender = genderSpinner.getSelectedItem().toString();
Intent genderIntent = new Intent(studentInfoActivity.this, reviewScreenActivity.class);
genderIntent.putExtra("studentGender", studentGender);
startActivity(genderIntent);
}
}
Java code of reviewScreenActivity:
public class reviewScreenActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_review_screen);
//Student Full Name reciever
Bundle sfnBundle = getIntent().getExtras();
String studentFullName = sfnBundle.getString("studentFullName");
if (studentFullName != null) {
TextView sfn = (TextView) findViewById(R.id.studentFullNameReviewScreen);
sfn.setText(studentFullName);
}
else {
TextView sfn = (TextView) findViewById(R.id.studentFullNameReviewScreen);
sfn.setText("Not showing right!");
}
//Student Gender Reciever
Bundle sgBundle = getIntent().getExtras();
String studentGender = sgBundle.getString("studentGender");
TextView sg = (TextView)findViewById(R.id.studentGenderReviewScreen);
sg.setText(studentGender);
}
}

Well you have a lot of mistakes such as incorrect class and method names.
You can pass as many as you want extra in one intent.
public void createCaregiverInfoSplash(View v){
//Send Student Full Name
EditText studentFullNameInput = (EditText) findViewById(R.id.studentFullNameInput);
String studentFullName = studentFullNameInput.getText().toString();
Spinner genderSpinner = (Spinner) findViewById(R.id.genderSpinner);
String studentGender = genderSpinner.getSelectedItem().toString();
Intent reviewIntent = new Intent(studentInfoActivity.this, reviewScreenActivity.class);
reviewIntent.putExtra("studentFullName", studentFullName);
reviewIntent.putExtra("studentGender", studentGender);
startActivity(studentIntent);
}