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Toolbar disappears while replacing fragment when Data Binding in Android

I'm replacing my main activity's layout with fragments in order to keep the same navigation menu. However I've done data binding to fragment_home.xml and now the toolbar no longer shows up, even though I still switch to the intended fragment. After some debugging, I believe it has something to do with the setContentView in HomeFragment.java.
Any ideas?
Here's my activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
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/drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity"
tools:openDrawer="start">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#000"
android:elevation="4dp"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<FrameLayout
android:id="#+id/frag_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<com.google.android.material.navigation.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="#layout/nav_header"
app:menu="#menu/side_navbar"
app:itemTextColor="#color/black"
app:itemIconTint="#color/black"/>
</androidx.drawerlayout.widget.DrawerLayout>
Replacing frame layout with the fragment
getSupportFragmentManager().beginTransaction().replace(R.id.frag_container, new HomeFragment()).commit(); ```
And the fragment_home.xml
<?xml version="1.0" encoding="utf-8"?>
<layout 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"
tools:context=".HomeFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/viewCities"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:padding="4dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</layout>
And finally the HomeFragment.java
public class HomeFragment extends Fragment {
private CityViewModel cityViewModel;
private RetrofitAdapter retrofitAdapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
View view = inflater.inflate(R.layout.fragment_home, container, false);
FragmentHomeBinding activityMainBinding =
DataBindingUtil.setContentView(getActivity(), R.layout.fragment_home);
RecyclerView recyclerView = activityMainBinding.viewCities;
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setHasFixedSize(true);
cityViewModel = new ViewModelProvider(requireActivity()).get(CityViewModel.class);
retrofitAdapter = new RetrofitAdapter();
recyclerView.setAdapter(retrofitAdapter);
return view;
}
}

You do not have to set the content view again from the fragment. From the HomeFragnent for using the data-binding just do something as follows.
FragmentHomeBinding binding; // declare the binding variable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil
.inflate(inflater, R.layout.fragment_home, container, false);
/* FragmentHomeBinding activityMainBinding =
DataBindingUtil.setContentView(getActivity(), R.layout.fragment_home); */
RecyclerView recyclerView = binding.viewCities; // use the binding here
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setHasFixedSize(true);
cityViewModel = new ViewModelProvider(requireActivity()).get(CityViewModel.class);
retrofitAdapter = new RetrofitAdapter();
recyclerView.setAdapter(retrofitAdapter);
return binding.getRoot();
}

I am trying open a Fragment From onOptionsItemSelected Method

I am trying to call a fragment from an activity. But unable. This is what I tried.
#Override
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
if (item.getItemId()==R.id.action_search){
SearchFragment searchFragment=new SearchFragment();
getSupportFragmentManager().beginTransaction().add(R.id.container,searchFragment,null).commit();
}
return true;
}
And My main_activity.xml
<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/container"
tools:context=".Controllers.MainActivity">
After trying the app does crash but its also not opening the fragment which I want.
The fragment xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/searchFragment"
tools:context=".SearchFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerViewSearchFrag"
android:layout_width="match_parent"
android:layout_height="match_parent">
</androidx.recyclerview.widget.RecyclerView>
And Fragment java is
public class SearchFragment extends Fragment {
private RecyclerView mRecyclerViewSearch;
private RecyclerViewAdpater mAdpater;
public SearchFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.fragment_search, container, false);
mRecyclerViewSearch=view.findViewById(R.id.recyclerViewSearchFrag);
mRecyclerViewSearch.setLayoutManager(new LinearLayoutManager(getContext()));
mAdpater=new RecyclerViewAdpater(DataSevices.mChineseColors,getActivity());
return view;
}
}
Please correct me if I am doing anything wrong

You can use Framlayout instead of Linear-layout
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/frame"
android:layout_width="match_parent"
android:layout_height="match_parent">

if you want some other components in your MainActivity , create a fragment for that.
and replace it.
in activity_main.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/frameLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" />
in your fragment xml:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SearchFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerViewSearchFrag"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
create new fragment fragment_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
...
</LinearLayout>
and MainFragment.java
public class MainFragment extends Fragment {
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup
container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_main, container, false);
//...
return view;
}
}

Create Switch and add it to Layout

I have a Fragment
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
android:id="#+id/switchLayout">
</LinearLayout>
</FrameLayout>
and want to add switches to the LinearLayout as soon as the Fragment is loaded
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootview = inflater.inflate(R.layout.fragment, container, false);
LinearLayout switchLayout = (LinearLayout) rootview.findViewById(R.id.switchLayout);
Switch new_switch = new Switch(getActivity());
new_switch.setText("test");
new_switch.setChecked(true);
switchLayout.addView(new_switch);
return rootview;
}
but when the Fragment gets loaded nothing happens, the LinearLayout is displayed but the switch doesn't appear and I don't get any error messages.
I already tried adding
new_switch.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT)
);
but it makes no difference
note: this is my first question here, hopefully it's not too stupid ^^

I've tried to perform the same what you are doing and it works.
Main activity layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
<FrameLayout
android:id="#+id/containerFragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
Then in MainActivity.java:
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(R.id.containerFragment,
new MyFragment()).commit();
MyFragment and fragment layout is the same as you described.
Result:

Android: Fragment with tabs

How can I put tabs inside of my fragment? I have been struggling with this and would greatly appreciate some help.
Currently I am getting this error: Did you forget to call 'public void setup(LocalActivityManager activityGroup)'?
However, even when I add a call to this I still get a fatal crash with an error:
Must call setup() that takes a Context and FragmentManager
This seems to be contradictory....
Below is the relevant Java and XML:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View v = inflater.inflate(R.layout.fragment_profile, container, false);
mTabHost = new FragmentTabHost(getActivity());
mTabHost.setup(getActivity().getApplicationContext(), getChildFragmentManager(), R.layout.testtabhost1);
//LocalActivityManager mLocalActivityManager = new LocalActivityManager(getActivity(), false);
//mLocalActivityManager.dispatchCreate(savedInstanceState);
//mTabHost.setup(mLocalActivityManager);
//LocalActivityManager mLocalActivityManager = new LocalActivityManager(getActivity(), false);
//mTabHost.setup(mLocalActivityManager);
Intent q_intent = new Intent (getActivity(), QuestionTabActivity.class);
Intent a_intent = new Intent (getActivity(), AnswerTabActivity.class);
View questionIndicator = createTabView(mTabHost.getContext(), "Questions");
View answerIndicator = createTabView(mTabHost.getContext(), "Answers");
mTabHost.addTab(mTabHost.newTabSpec("questions").setIndicator(questionIndicator).setContent(q_intent));
mTabHost.addTab(mTabHost.newTabSpec("answers").setIndicator(answerIndicator).setContent(a_intent));
mTabHost.setCurrentTab(0);
// Inflate the layout for this fragment
return v;
}
And the XML:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.juryroom.qollege_android_v1.ProfileFragment">
.........
...ETC...
.........
<android.support.v4.app.FragmentTabHost
android:id="#+id/testtabhost1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/edit_profile_picture_fragment_circView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TabWidget
android:id="#android:id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:showDividers="none"></TabWidget>
<FrameLayout
android:id="#android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
</android.support.v4.app.FragmentTabHost>
.........
...ETC...
.........
</FrameLayout>
Here is the design look I'm making:

mTabHost = (FragmentTabHost) v.findViewById(android.R.id.tabhost);
mTabHost.setup(getActivity(), getChildFragmentManager(), R.id.realtabcontent);
mTabHost.addTab(mTabHost.newTabSpec(Constant.BuildingPicture.FRONT_PHOTOS).setIndicator(Constant.BuildingPicture.FRONT_PHOTOS),SiteDataFrontPhotoTab.class, null);
mTabHost.addTab(mTabHost.newTabSpec(Constant.BuildingPicture.SATELLITE_PHOTOS).setIndicator(Constant.BuildingPicture.SATELLITE_PHOTOS),SiteDataSatellitePhotoTab.class, null);

In order to display tabs we don’t have to use any other UI element like TabHost. Action bar has the inbuilt capability of adding tabs. All we have to do is enable it using setNavigationMode(ActionBar.NAVIGATION_MODE_TABS).
Here is a good description of what you are looking for.

Align layout to parent bottom not working - After setting layout height programatically

I am trying to place the fragment at the bottom of the screen. By setting the property android:layout_alignParentBottom="true", the fragment is placed as my requirements.
Now I'm trying to specify the height of the fragment programatically. The height is being set properly. But the fragment is not placed at the bottom of the parent.
Here is me code:
fragment_main.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_gravity="bottom"
android:layout_alignParentBottom="true"
android:layout_marginTop="30dp"
android:background="#4e534d"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.gokul.myprogram.MainActivity$PlaceholderFragment" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
</LinearLayout>
MainActivity.java:
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(screenWidth, screenHeight/2); // Commented
layoutParams.gravity = Gravity.BOTTOM; // Commented
rootView.setLayoutParams(layoutParams); // Commented
return rootView;
}
}
Screenshot Without Commenting:
Screenshot With Commenting: (See // Commented)