App has Viewpager that has four tab with fragment. Second fragment has framelayout "FL" where I put fragment with listview. And when user click listview item opened new fragment with listview in this framelayout "FL" and and so on.
I am going to do catalog with prudacts with multilevel category.
My quation: How can I implement that in second fragment when I opened fragment level 3 than by clicking Toolbar home button go back to fragment level 2 and to another click back to fragment level 1 (popBackStack) and finally when click Toolbar home button go to first Tab. Any help be usefull for me. Thanks
There is what I fecit:
I use home button for go First Tab from other Tabs:
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
MainActivity.this.setCurrentItem(0, true);
}
});
To replace fragment use the below code
#Override
public void replaceFragment(Fragment fragment, String title) {
String backStateName = fragment.getClass().getName();
FragmentManager manager = getSupportFragmentManager();
boolean fragmentPopped = manager.popBackStackImmediate(backStateName, 0);
if (!fragmentPopped) { //fragment not in back stack, create it.
FragmentTransaction ft = manager.beginTransaction();
ft.replace(R.id.container_body, fragment);
ft.addToBackStack(backStateName);
ft.commit();
// getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setTitle("");
}
}
Add the below mentioned code in your fragment class
Add the below line in your Fragment onCreateView
setHasOptionsMenu(true);
Use the below code to go back the previous fragment.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
if (getActivity().getSupportFragmentManager().getBackStackEntryCount() > 1) {
getFragmentManager().popBackStack();
return true;
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#Override
public void onDetach() {
super.onDetach();
if (getActivity().getSupportFragmentManager().getBackStackEntryCount() > 1) {
getFragmentManager().popBackStack();
}
}
Related
Hello im trying to navigate between some fragments with addToBaackStack but having issues with it ,
Ok i will explain it in detail so there should be no confusuion
1 :- I have only one activity (main activity) which consist of all the other fragments and a fragment container to hold the fragments in it , i have implemented bottom navigation in the main activity ,where the bottom navigation have 5 main fragments home,following,upload,notification and profile my issues is related to the profile fragment
2 :- In the profile fragment i have some buttons like edit profile button which opens edit profile fragment but now when i presse back it should navigate back to the profile fragment which it is not doing ,its is navigating to the last fragment of the bottomnavigation (which can be any other of the main fragments for eg if my last fragment is following fragment then when i press back from the edit profile fragment it goes to the following fragment )but this not happens if i put a back arrow icon in edit profile fragment then when i click the back arrow it perfectly navigate me to the profile fragments as it is not related to addToBackStack
It shows that the issue is related with my bottom navigation but i dont know how to exactly fix it
Prifile_Fragment.java
editProfileButton.setOnClickListener(v -> {
Fragment edit_profile = new Edit_Profile();
assert getFragmentManager() != null;
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, edit_profile);
transaction.addToBackStack(null);
transaction.commit();
});
MainActivity.java // where the bottom navigation is implemented
public class MainActivity extends AppCompatActivity {
public BottomNavigationView bottomNavigationView;
Deque<Integer> integerDeque = new ArrayDeque<>(4);
boolean flag = true;
#RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
setContentView(R.layout.activity_main);
Window window = this.getWindow();
window.setStatusBarColor(this.getResources().getColor(R.color.black));
bottomNavigationView = findViewById(R.id.bottom_navigation_view);
integerDeque.push(R.id.nav_home);
loadFragments(new Home_Fragment());
bottomNavigationView.setSelectedItemId(R.id.nav_home);
bottomNavigationView.setOnNavigationItemSelectedListener(
item -> {
int id = item.getItemId();
if (integerDeque.contains(id)) {
if (id == R.id.nav_home) {
integerDeque.size();
if (flag) {
integerDeque.addFirst(R.id.nav_home);
flag = false;
}
}
integerDeque.remove(id);
}
integerDeque.push(id);
loadFragments(getFragment(item.getItemId()));
return false;
}
);
}
#SuppressLint("NonConstantResourceId")
private Fragment getFragment(int itemId) {
switch (itemId) {
case R.id.nav_home:
bottomNavigationView.getMenu().getItem(0).setChecked(true);
return new Home_Fragment();
case R.id.nav_following:
bottomNavigationView.getMenu().getItem(1).setChecked(true);
return new Following_Fragment();
case R.id.nav_upload:
bottomNavigationView.getMenu().getItem(2).setChecked(true);
return new Upload_Fragment();
case R.id.nav_notification:
bottomNavigationView.getMenu().getItem(3).setChecked(true);
return new Notification_Fragment();
case R.id.nav_profile:
bottomNavigationView.getMenu().getItem(4).setChecked(true);
return new Profile_Fragment();
}
bottomNavigationView.getMenu().getItem(0).setChecked(true);
return new Home_Fragment();
}
public void loadFragments(Fragment fragment) {
if (fragment != null) {
getSupportFragmentManager().beginTransaction()
.replace(R.id.fragment_container, fragment, fragment.getClass().getSimpleName())
.commit();
}
}
#Override
public void onBackPressed() {
integerDeque.pop();
if (!integerDeque.isEmpty()) {
loadFragments(getFragment(integerDeque.peek()));
} else {
finish();
}
}
}
Have you consider to use popBackStack ? You can try this.
#Override
public void onBackPressed() {
final FragmentManager fragmentManager = getSupportFragmentManager();
if (fragmentManager.getBackStackEntryCount() > 0) {
fragmentManager.popBackStack();
} else {
finish();
}
}
I have 3 fragments, Home, Menu and orders they can be loaded by bottomnavigtioview items and the title shown by it as well
once navigate from Home to Orders then if you want to go back to Home From Orders the title still "Orders"
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment fragment;
switch (item.getItemId()) {
case R.id.navigation_home:
toolbar.setTitle(getResources().getString(R.string.title_home));
fragment = new HomeFragment();
loadFragment(fragment);
return true;
case R.id.navigation_menu:
toolbar.setTitle(getResources().getString(R.string.fragment_title_menu));
fragment = new ProductFragment();
loadFragment(fragment);
return true;
case R.id.navigation_orders:
toolbar.setTitle(getResources().getString(R.string.title_orders));
fragment = new OrdersFragment();
loadFragment(fragment);
return true;
}
return false;
}
};
private void loadFragment(Fragment fragment) {
// load fragment
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_container, fragment);
transaction.addToBackStack(null);
transaction.commit();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
navigation = findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
// attaching bottom sheet behaviour - hide / show on scroll
CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) navigation.getLayoutParams();
layoutParams.setBehavior(new BottomNavigationBehavior());
toolbar.setTitle(getResources().getString(R.string.title_home));
Fragment f = HomeFragment.newInstance();
getSupportFragmentManager().beginTransaction()
.replace(R.id.frame_container, f)
.commit();
}`
I have Also Tried this but its not working
`
fragmentmanger.addOnBackStackChangedListener -> public void onBackStackChanged() {
}`
Instead of calling toolbar.setTitle in your onNavigationItemSelected method, move it to onCreateView of each fragment. When you navigate back to a Fragment, onCreateView is executed again.
It worked for me when calling it in onResume like this in each fragment:
if(getActivity()!=null) {
((MainActivity)getActivity()).setActionBarTitle
(context.getResources().getString(R.string.YOUR_TITLE));
this is the function setActionBarTitle in MainActivity
public void setActionBarTitle(String title) {
toolbar.setTitle(title);
}
I have a bottom navigation bar that contains 4 fragments and when a tab is selected a new instance of that fragment is loaded.
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment fragment = null;
switch (item.getItemId()) {
case R.id.navigation_home:
fragment = HomeFragment.newInstance();
break;
case R.id.navigation_cards:
fragment = CardsFragment.newInstance();
break;
case R.id.navigation_deals:
fragment = DealsFragment.newInstance();
break;
case R.id.navigation_settings:
fragment = SettingsFragment.newInstance();
break;
}
if (fragment != null) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.content, fragment);
fragmentTransaction.commit();
}
return true;
}
};
Now in my HomeFragment there is a RecyclerView that On Item Select it opens a new Fragment:
myViewHolder.cardView.setOnClickListener(view -> {
System.out.println("clicked");
Fragment fragment = new TargetDetailsFragment();
FragmentTransaction ft = ((AppCompatActivity) context).getSupportFragmentManager()
.beginTransaction();
ft.replace(R.id.content, fragment).addToBackStack(null);
ft.commit();
});
I want to add a back button to the TargetDetails Fragments that takes you back to the home page when selected and I attempted doing that by implementing OnBackStackChangedListener in the Main activity
#Override
public void onBackStackChanged() {
shouldDisplayHomeUp();
}
public void shouldDisplayHomeUp(){
//Enable Up button only if there are entries in the back stack
boolean canback = getSupportFragmentManager().getBackStackEntryCount()>0;
getSupportActionBar().setDisplayHomeAsUpEnabled(canback);
}
#Override
public boolean onSupportNavigateUp() {
//This method is called when the up button is pressed. Just the pop back stack.
getSupportFragmentManager().popBackStack();
return true;
}
}
but the problem is when I click on it its reloads the HomeFragment Again but I simply want it to go back to the saved instance of that Fragment
Here is my code that I have used for the ViewPager, the idea is to see if the current page number is 0 than to proceed super.onBackPressed(); otherwise go to the previous fragment:
#Override
public void onBackPressed() {
if(vpPager.getCurrentItem()!=0) {
vpPager.setCurrentItem(vpPager.getCurrentItem()-1, true);
} else {
super.onBackPressed();
}
}
By adding below code in your Activity.
The fragment back stack can be managed.
#Override
public void onBackPressed() {
int count = getFragmentManager().getBackStackEntryCount();
if (count == 0) {
super.onBackPressed();
//additional code
} else {
getFragmentManager().popBackStack();
}
}
Hello #Bolu Okunaiya i think you should try this it will help you to manage backstack to desired fragment without loading same fragment again.
For Stop loading previous fragment you should use "add" instead of "replace" with your FragmentTransaction
Inside your MainActivity
#Override
public void onBackStackChanged() {
//shouldDisplayHomeUp();
Fragment currentFragment = getActivity().getFragmentManager()
.findFragmentById(R.id.fragment_container);
if (currentFragment instanceof TargetDetails) {
Log.v(TAG, "your current fragment is TargetDetails");
popBackStackImmediate(); //<<<< immediate parent fragment will open,which is your HomeFragement
}
}
To use popBackStackImmediate() you need to *replace FragmentA with FragmentB and use addToBackstack() before commit().
I have an AppCompatActivity with
Android.Support.V7.Widget.Toolbar myToolbar = (Android.Support.V7.Widget.Toolbar)FindViewById(Resource.Id.my_toolbar);
SetSupportActionBar(myToolbar);
SupportActionBar.SetDisplayHomeAsUpEnabled(true);
I use fragments in this activity to change what is displayed under the toolbar. I want each fragment (on SupportFragmentManager.BeginTransaction().Replace(Resource.Id.content, myFragment).Commit()) to be pushed on a stack so on toolbar back button touch or android back button press previous fragment is popped and displayed. How to do that?
I solved that by overriding OnOptionsItemSelected in my activity:
public override bool OnOptionsItemSelected(IMenuItem item)
{
if (SupportFragmentManager.BackStackEntryCount == 0)
{
return base.OnOptionsItemSelected(item);
}
SupportFragmentManager.PopBackStack();
return true;
}
Note: No need to override OnBackPressed.
use this :
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(containerId, fragment, fragment.getClass().getSimpleName());
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
#Override
public void onBackPressed() { //or use on menu item clicked
FragmentManager fragmentManager = getSupportFragmentManager();
if (fragmentManager.getBackStackEntryCount() > 0) {
fragmentManager.popBackStack();
}else {
super.onBackPressed();
}
}
I'm using this tutorial to implement facebook login etc.
Facebook Login
I have added new fragment in this to show list of friends. Now when I press back button on my newly added fragment it takes me to the SPLASH fragment, I want same behaviour on back button on action bar. Means when I'm on my new fragment it shows me a back button on action bar. And pressing that back button takes me back to the SPLASH screen.
private void showFragment(int fragmentIndex, boolean addToBackStack) {
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
for (int i = 0; i < fragments.length; i++) {
if (i == fragmentIndex) {
transaction.show(fragments[i]);
} else {
transaction.hide(fragments[i]);
}
}
if (addToBackStack) {
transaction.addToBackStack(null);
}
transaction.commit();
}
You can do that by two ways :
1. Inside your fragment
#Override
public void onDetach()
{
super.onDetach();
PUT YOUR CODE HERE
}
This will called when fragment will be finished.
2. Just add addToBackStack while you are transitioning between your fragments like below:
fragmentManager.beginTransaction().replace(R.id.content_frame,fragment).addToBackStack("tag").commit();
if you write addToBackStack(null) , it will handle it by itself but if you give a tag , you should handle it manually.
EDITED:
for doing transactions
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
Fragment scheduleFragment = new ScheduleFragment();
fragmentTransaction.replace(R.id.content_container, scheduleFragment, "scheduleFragment");
fragmentTransaction.addToBackStack("scheduleFragment");
fragmentTransaction.commit();
#Yawar actionbar is on activity only and this will added on activity it will be called evertime when u press actionbar home button-->
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// app icon in action bar clicked; goto parent activity.
this.finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
i got this code on stackoverflow after searching hard hope this may help you
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);// in on Create()
search for code onOptionsItemSelected(MenuItem item)
and edit it in this way
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// change your behaviour here
Intent intent = new Intent(this, yourclass.class);// i started new activity here
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
return true;
}
return super.onOptionsItemSelected(item);
}