Replacing a fragment with another fragment inside activity group

Question

I have a fragment inside a group activity and I want to replace it with another fragment   FragmentTransaction ft   getActivity   getFragmentManager   beginTransaction    SectionDescriptionFragment bdf   new SectionDescriptionFragment    ft replace R id book description fragment  bdf   ft setTransition FragmentTransaction TRANSIT FRAGMENT OPEN   ft addToBackStack null   ft commit      It works fine when it is done as a seperate project without using activity group  every thing works fine in log cat as control goes inside getview    but no view is visible  not even any exception arises  I want the book detail fragment to be replaced by section detail fragment   Xml of book detail fragment has id book description fragment and xml for section description fragment has id section description fragment   The above code is in onClick method of an item  I want that when user taps on an item in horizontal scroll view  then the fragment changes

User · Answer

Use ViewPager  It s work for me   final ViewPager viewPager    ViewPager  getActivity   findViewById R id vp pager    button    Button result findViewById R id button   button setOnClickListener new View OnClickListener          Override     public void onClick View v            viewPager setCurrentItem 1

User · Answer

Use the below code in android support v4  FragmentTransaction ft1   getFragmentManager   beginTransaction    WebViewFragment w1   new WebViewFragment    w1 init linkData getLink     ft1 addToBackStack linkData getName     ft1 replace R id listFragment  w1   ft1 commit

User · Answer

This will work if you re trying to change the fragment from another fragment  Objects requireNonNull getActivity    getSupportFragmentManager    beginTransaction    replace R id home fragment container new NewFragment     NOTE As stated in the above answers  You need to have dynamic fragments

User · Answer

Use this code using v4               ExampleFragment newFragment   new ExampleFragment          FragmentTransaction transaction   getSupportFragmentManager   beginTransaction          Replace whatever is in the fragment container view with this fragment        and add the transaction to the back stack so the user can navigate back     transaction replace R id container  newFragment    transaction addToBackStack null         Commit the transaction     transaction commit

User · Answer

I ve made a gist with THE perfect method to manage fragment replacement and lifecycle    It only replace the current fragment by a new one  if it s not the same and if it s not in backstack  in this case it will pop it     It contain several option as if you want the fragment to be saved in backstack       See Gist here  Using this and a single Activity  you may want to add this to your activity    Override public void onBackPressed         int fragments   getSupportFragmentManager   getBackStackEntryCount        if  fragments    1                finish                return             super onBackPressed

User · Answer

Fragments that are hard coded in XML  cannot be replaced  If you need to replace a fragment with another  you should have added them dynamically  first of all    Note  R id fragment container is a layout or container of your choice in the activity you are bringing the fragment to      Create new fragment and transaction Fragment newFragment   new ExampleFragment    FragmentTransaction transaction   getSupportFragmentManager   beginTransaction        Replace whatever is in the fragment container view with this fragment     and add the transaction to the back stack if needed transaction replace R id fragment container  newFragment   transaction addToBackStack null       Commit the transaction transaction commit

User · Answer

In kotlin you can do      instantiate the new fragment val fragment  Fragment   ExampleFragment    val transaction   supportFragmentManager beginTransaction   transaction replace R id book description fragment  fragment  transaction addToBackStack  transaction name      Commit the transaction transaction commit

User · Answer

you can use simple code its work for transaction  Fragment newFragment   new MainCategoryFragment    FragmentTransaction ft   getSupportFragmentManager   beginTransaction    ft replace R id content frame NavButtom  newFragment   ft commit

User · Answer

You Can Use This code    AppCompatActivity  getActivity    getSupportFragmentManager   beginTransaction   replace R id YourFrameLayout  new YourFragment    commit      or You Can This Use Code  YourFragment fragments  YourFragment  getSupportFragmentManager   findFragmentById R id FrameLayout            if  fragments  null                getSupportFragmentManager   beginTransaction   replace R id FrameLayout  new Fragment News    commit

User · Answer

Please see this Question  You can only replace a  dynamically added fragment    So  if you want to add a dynamic fragment  see this example

User · Answer

I change fragment dynamically in single line code  It is work in any SDK version and androidx  I use navigation as BottomNavigationView      BottomNavigationView btn nav      FragmentFirst fragmentFirst      FragmentSecond fragmentSecond        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity search           fragmentFirst   new FragmentFirst            fragmentSecond   new FragmentSecond             changeFragment fragmentFirst      at first time load the fragmentFirst         btn nav   findViewById R id bottomNav           btn nav setOnNavigationItemSelectedListener new BottomNavigationView OnNavigationItemSelectedListener                  Override             public boolean onNavigationItemSelected  NonNull MenuItem menuItem                    switch menuItem getItemId                         case R id menu first frag                          changeFragment fragmentFirst      change fragmentFirst                         break                      case R id menu second frag                          changeFragment fragmentSecond      change fragmentSecond                         break                          default                              Toast makeText SearchActivity this   Click on wrong bottom SORRY    Toast LENGTH SHORT  show                                      return true                                    public void changeFragment Fragment fragment            getSupportFragmentManager   beginTransaction   replace R id fragment layout changer  fragment  commit

User · Answer

hope you are doing well when I started work with Android Fragments then I was also having the same problem then I read about  1- How to switch fragment with other  2- How to add fragment if Fragment container does not have any fragment   then after some R amp D  I created a function which helps me in many Projects till now and I am still using this simple function   public void switchFragment BaseFragment baseFragment        try           FragmentTransaction ft   getSupportFragmentManager   beginTransaction            ft setCustomAnimations android R anim slide in left  android R anim slide out right           if  getSupportFragmentManager   findFragmentById R id home frame     null                ft add R id home frame  baseFragment             else               ft replace R id home frame  baseFragment                     ft addToBackStack null           ft commit          catch  Exception e            e printStackTrace              enjoy your code time

[java] Replacing a fragment with another fragment inside activity group

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