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BottomNavigation.setVisibility doesn't work

I create an application and use a BottomNavigationView in it and one of the fragments calls the other fragment through the adapter. I am trying to make the BottomNavigationView disappear when this fragment is called, for this I use setVisibility (). But the problem is that it doesn’t disappear, maybe someone can tell me what I’m doing wrong
BottomNavigationView:
public class ProfileFragment extends Fragment {
private ImageView avatar;
private TextView nickname, bio, website;
private FirebaseMethods mFirebaseMethods;
private Context mContext;
private AppBarLayout mAppBarLayout;
private Menu mMenu;
private RecyclerView mRecyclerView;
private FirebaseUser mCurrentUser;
private TextView followers, followings;
private BottomNavigationView mBottomNavigationView;
private String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE};
private ActivityResultContracts.RequestMultiplePermissions mRequestMultiplePermissions= new ActivityResultContracts.RequestMultiplePermissions();
private DatabaseReference mDatabaseReference;
private DatabaseReference followingRef;
private DatabaseReference followersRef;
private ReadWritePermissions mReadWritePermissions;
private IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
private String mParam1;
private String mParam2;
public ProfileFragment() {
// Required empty public constructor
}
public static ProfileFragment newInstance(String param1, String param2) {
ProfileFragment fragment = new ProfileFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_profile2, container, false);
mContext = container.getContext();
mFirebaseMethods = new FirebaseMethods(mContext);
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
mBottomNavigationView = getActivity().findViewById(R.id.bottomNavigation);
followingRef = FirebaseDatabase.getInstance().getReference("Following");
followersRef = FirebaseDatabase.getInstance().getReference("Followers");
Toolbar toolbar = view.findViewById(R.id.toolbar);
mAppBarLayout = view.findViewById(R.id.app_bar);
mRecyclerView = view.findViewById(R.id.posts_recycler);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayShowTitleEnabled(false);
setHasOptionsMenu(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getActivity().finish();
}
});
loadPosts();
avatar = view.findViewById(R.id.profile_avatar);
nickname = view.findViewById(R.id.profile_nickname);
bio = view.findViewById(R.id.profile_bio);
website = view.findViewById(R.id.profile_website);
followers = view.findViewById(R.id.followers_count);
followings = view.findViewById(R.id.following_count);
setFollowingFollowers();
followers.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FollowersFollowingsFragment fragment = new FollowersFollowingsFragment();
Bundle args = new Bundle();
args.putString("uid", mCurrentUser.getUid());
args.putString("followingsOrFollowers", "followers");
fragment.setArguments(args);
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.frame_container,fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
});
followings.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FollowersFollowingsFragment fragment = new FollowersFollowingsFragment();
Bundle args = new Bundle();
args.putString("uid", mCurrentUser.getUid());
args.putString("followingsOrFollowers", "followers");
fragment.setArguments(args);
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.frame_container,fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
});
avatar.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
mFirebaseMethods.getUserDataProfile(avatar, nickname, bio);
return view;
}
private void loadPosts()
{
mReadWritePermissions = new ReadWritePermissions(getActivity().getLifecycle(), getActivity().getActivityResultRegistry());
getLifecycle().addObserver(mReadWritePermissions);
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
mDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Posts");
mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
FirebaseRecyclerOptions<Posts> options
= new FirebaseRecyclerOptions.Builder<Posts>()
.setQuery(mDatabaseReference.orderByChild("uid").equalTo(mCurrentUser.getUid()), Posts.class)
.build();
mReadWritePermissions = new ReadWritePermissions(getActivity().getLifecycle(), getActivity().getActivityResultRegistry());
getLifecycle().addObserver(mReadWritePermissions);
PostAdapter adapter = new PostAdapter(options, mContext, mReadWritePermissions);
mRecyclerView.setAdapter(adapter);
adapter.startListening();
}
private void setFollowingFollowers()
{
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
followersRef.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
followers.setText(Integer.toString((int)snapshot.child(mCurrentUser.getUid()).getChildrenCount()));
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
followingRef.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
followings.setText(Integer.toString((int)snapshot.child(mCurrentUser.getUid()).getChildrenCount()));
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
#Override
public void onPause() {
super.onPause();
}
#Override
public void onResume() {
super.onResume();
}
}

Use setVisibility(View.GONE) instead.
I had the same problem, for some reason it doesn't work, but in the docs they also use View.GONE.
EDIT: Use the method shown in the docs to hide/show BottomNavigationView depending on the Fragment.
navController.addOnDestinationChangedListener(new NavController.OnDestinationChangedListener() {
#Override
public void onDestinationChanged(#NonNull NavController controller,
#NonNull NavDestination destination, #Nullable Bundle arguments) {
if(destination.getId() == R.id.full_screen_destination) {
toolbar.setVisibility(View.GONE);
bottomNavigationView.setVisibility(View.GONE);
} else {
toolbar.setVisibility(View.VISIBLE);
bottomNavigationView.setVisibility(View.VISIBLE);
}
}
});
Use Navigation component like in this example.

I fixed this by using DataBinding and ObservableField for the visibility, I don't why it didn't work through the normal onDestinationChangedListener on the NavController, it just bluntly ignored that command, everything else in that block worked fine but not the visibility.
So an ObservableField in the databinding did the trick
android:visibility="#{hideBottomNav ? View.GONE : View.VISIBLE}"
And set the value to the observable field in the onDestinationChangedListener to your desired outcome
if(destination.id == R.id.navigation_your_notes){
hideBottomNav.set(true)
} else hideBottomNav.set(false)

Going from fragment to activity with a button. Android Studio

I'm trying to implent the next code in Android Studio and it does not work.
I want to pass from a Fragment (GalleryFragment) to an Activity (postropa) with a button.
I have linked the botton with the function (BotonPulsado) and I don't know what is wrong (In the design view).
Design View
Code:
import (...)
public class GalleryFragment extends Fragment {
private GalleryViewModel galleryViewModel;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
galleryViewModel =
ViewModelProviders.of(this).get(GalleryViewModel.class);
View root = inflater.inflate(R.layout.fragment_gallery, container, false);
final TextView textView = root.findViewById(R.id.text_gallery);
galleryViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
#Override
public void onChanged(#Nullable String s) {
textView.setText(s);
}
});
return root;
}
public void BotonPulsado(View view) {
Intent intent = new Intent(getContext(), postropa.class);
startActivity(intent);
}
}

You should create Button variаble as a class field.
private GalleryViewModel galleryViewModel;
Button button; <<-------
After that you need to define it in method onCreateView()
button = (Button) findViewById(R.id.button2);
And set onClickListener() on this button to handle the call.
There you must call the method that starts the activity.
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
BotonPulsado();
}
});
Your final code:
import (...)
public class GalleryFragment extends Fragment {
private GalleryViewModel galleryViewModel;
Button button;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
galleryViewModel =
ViewModelProviders.of(this).get(GalleryViewModel.class);
View root = inflater.inflate(R.layout.fragment_gallery, container, false);
final TextView textView = root.findViewById(R.id.text_gallery);
galleryViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
#Override
public void onChanged(#Nullable String s) {
textView.setText(s);
}
});
button = (Button) findViewById(R.id.button2);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
BotonPulsado();
}
});
return root;
}
public void BotonPulsado() {
Intent intent = new Intent(getContext(), postropa.class);
startActivity(intent);
}
}

How to Access Activity(except mainactivity) from Fragment?

I created my test project where i code to communicate between two fragments but actully I want to access activity from fragment.
Here is code to connect fragment to fragment, its working absolutely right without any error but now i want to change this code to connect activity from fragment instead of fragment to fragment communication.
So Please change this code to access activities from fragment. I stuck on this issue for than a week.So Guys please resolve this.
here is my mainaactivity:
public class MainActivity extends AppCompatActivity implements FragmentA.FragmentAListener, FragmentB.FragmentBListener {
private FragmentA fragmentA;
private FragmentB fragmentB;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentA = new FragmentA();
fragmentB = new FragmentB();
getSupportFragmentManager().beginTransaction()
.replace(R.id.container_a, fragmentA)
.replace(R.id.container_b, fragmentB)
.commit();
}
#Override
public void onInputASent(CharSequence input) {
fragmentB.updateEditText(input);
}
#Override
public void onInputBSent(CharSequence input) {
fragmentA.updateEditText(input);
}
Here is my FragmentA.java:
public class FragmentA extends Fragment {
private FragmentAListener listener;
private EditText editText;
private Button buttonOk;
public interface FragmentAListener {
void onInputASent(CharSequence input);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_a, container, false);
editText = v.findViewById(R.id.edit_text);
buttonOk = v.findViewById(R.id.button_ok);
buttonOk.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
CharSequence input = editText.getText();
listener.onInputASent(input);
}
});
return v;
}
public void updateEditText(CharSequence newText) {
editText.setText(newText);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof FragmentAListener) {
listener = (FragmentAListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement FragmentAListener");
}
}
#Override
public void onDetach() {
super.onDetach();
listener = null;
}
}
Here is my FragmentB.java:
public class FragmentB extends Fragment {
private FragmentBListener listener;
private EditText editText;
private Button buttonOk;
public interface FragmentBListener {
void onInputBSent(CharSequence input);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_b, container, false);
editText = v.findViewById(R.id.edit_text);
buttonOk = v.findViewById(R.id.button_ok);
buttonOk.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
CharSequence input = editText.getText();
listener.onInputBSent(input);
}
});
return v;
}
public void updateEditText(CharSequence newText) {
editText.setText(newText);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof FragmentBListener) {
listener = (FragmentBListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement FragmentBListener");
}
}
#Override
public void onDetach() {
super.onDetach();
listener = null;
}
}
Here is my Fertilizers.java file which i want to access from FragmentA.:
public class Fertilizers extends AppCompatActivity {
RecyclerView mRecyclerView;
List<FertilizerData> myFertilizersList;
FertilizerData mFertilizersData;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fertilizers);
mRecyclerView = (RecyclerView)findViewById(R.id.recyclerView);
GridLayoutManager gridLayoutManager;
gridLayoutManager = new GridLayoutManager(Fertilizers.this, 1);
mRecyclerView.setLayoutManager(gridLayoutManager);
myFertilizersList = new ArrayList<>();
mFertilizersData = new FertilizerData("Urea Fertilizer","Urea is a concent","Rs.1900",R.drawable.urea);
myFertilizersList.add(mFertilizersData);
myFertilizersList.add(mFertilizersData); }
}
please write here a block of code to call Fertilzers Activity from FragmentA, I,ll be very thankful to you.

Calling getActivity() in your fragment gives you the calling activity so if MainActivity started your fragment then you would do
(MainActivity(getActivity())).something_from_your_main_activity

Solution found by itself regarding this issue.
FragmentHome.java class should look like this:
public class FragmentHome extends Fragment {
private Button button;
public FragmentHome(){
}
public interface OnMessageReadListener
{
public void onMessageRead(String message);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_home, container, false);
button = (Button)v.findViewById(R.id.bn);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), Fertilizers.class);
intent.putExtra("some"," some data");
startActivity(intent);
}
});
return v;
}
}
FertilizersActivity.java should look like this:
public class Fertilizers extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fertilizers);
Bundle bundle = getIntent().getExtras();
if (bundle != null){
if(bundle.getStringArrayList("some") !=null){
Toast.makeText(getApplicationContext(),"data:" + bundle.getStringArrayList("some"),Toast.LENGTH_LONG).show();
}
}
}
}

setonclicklistener for a button in custom dialogfragment class

i have created a custom class extending dialog fragment and im using a layout to inflate into this dialog now when i want to set my onclicklistener in main activity but it returns null point exception when im setting my on click listener heres my main activity and my dialog fragment :
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button cancelDialog = (Button) findViewById(R.id.cancelDialogButton);
View.OnClickListener listenerDialog = new View.OnClickListener() {
#Override
public void onClick(View v) {
}
};
//this is where i get the null point exception
cancelDialog.setOnClickListener( listenerDialog );
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ViewGroup Addition = (ViewGroup) findViewById(R.id.activity_addition);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FragmentManager fm = getSupportFragmentManager();
DialogCards editNameDialogFragment = DialogCards.newInstance();
editNameDialogFragment.show(fm, "fragment_edit_name");
}
});
and now my costume class extending dialog fragment :
public class DialogCards extends DialogFragment {
public Dialog dialog;
#NonNull
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
Dialog dialog = super.onCreateDialog(savedInstanceState);
// request a window without the title
dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
return dialog;
}
#Override
public void onResume() {
// Store access variables for window and blank point
Window window = getDialog().getWindow();
Point size = new Point();
// Store dimensions of the screen in `size`
Display display = window.getWindowManager().getDefaultDisplay();
display.getSize(size);
// Set the width of the dialog proportional to 75% of the screen width
window.setLayout((int) (size.x * 0.75), WindowManager.LayoutParams.WRAP_CONTENT + 20);
window.setGravity(Gravity.CENTER);
// Call super onResume after sizing
super.onResume();
}
public DialogCards() {
}
public static DialogCards newInstance() {
DialogCards frag = new DialogCards();
Bundle args = new Bundle();
frag.setArguments(args);
return frag;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.carddialog, container);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getDialog().getWindow().setSoftInputMode(
WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
}}

You can replace this method in you DialogCards class
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getDialog().getWindow().setSoftInputMode(
WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
final Button cancelDialog = (Button)view.findViewById(R.id.cancelDialogButton);
View.OnClickListener listenerDialog = new View.OnClickListener() {
#Override
public void onClick(View v) {
}
};
cancelDialog.setOnClickListener( listenerDialog );
}}

How to add a button to viewpager with setOnClickListener

I have a layout with a buttons. I use FragmentActivity:
public class slidepage extends FragmentActivity {
private static final int NUM_PAGES = 5;
private ViewPager mPager;
private PagerAdapter mPagerAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_screen_slide);
mPager = (ViewPager) findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
Button Back = (Button) findViewById(R.id.back);
Back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
}
}
slide class:
public class slider extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
ViewGroup view;
if(GlobalConfig.tryb) {
view = (ViewGroup) inflater.inflate(R.layout.n_podglad, container, false);
} else {
view = (ViewGroup) inflater.inflate(R.layout.d_podglad, container, false);
}
/* Powrót */
Button Back = (Button) view.findViewById(R.id.back);
Back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//onBackPressed();
}
});
return view;
}
}
Unfortunately my button not works. I receive null reference in log. What is wrong? How can I set OnClickListener on my buttons in viewpager?

Inside ScreenSlidePagerAdapter in instantiateItem method write your button click not in your slidepage
#Override
public Object instantiateItem(View container, int position) {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater) act
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout= inflater.inflate(R.layout.pager_layout, null);
Button Back= (Button) layout.findViewById(R.id.back);
Back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
return layout;
}