I'm creating a fragment which is supposed to act like a menu. I have successfully inflated it to the activity where I wanted it to be, however I now I realise that I cannot close the fragment. Furthermore I am able to scroll the contents of the activity which the fragment is placed over. How can I edit my code in such a way that the fragment will close after an action on the activity is detected, or one of it's contents is clicked?
I created the fragment by simply adding a fragment via new -> Fragment -> Fragment(Blank). I have not touched any of the code and have initialized the fragment like so in a on click:
findViewById(R.id.Menu).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.setCustomAnimations(R.anim.enter_from_left, R.anim.exit_to_left, R.anim.enter_from_left, R.anim.exit_to_left);
MenuFragment menuFragment = new MenuFragment();
fragmentTransaction.replace(android.R.id.content, menuFragment);
fragmentTransaction.commit();
}
});
This is what it looks like, ignore the horrendous design.
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.
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();
Please see this Question
You can only replace a "dynamically added fragment".
So, if you want to add a dynamic fragment, see this example.
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();
}
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();
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);
}
});
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&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 :)
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();
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();
}
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();
}
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()
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.
You can use fragment-ktx
// If you are in fragmet
childFragmentManager.beginTransaction()
// or if you are in activiry
supportFragmentManager.beginTransaction()
// Create and commit a new transaction
supportFragmentManager.commit {
setReorderingAllowed(true)
// Replace whatever is in the fragment_container view with this fragment
replace<ExampleFragment>(R.id.fragment_container)
}
To replace a fragment with another one do this, Note that R.id.fragment comes from the id that you give to the first tag of the fragment in the XML.
barAudioPlaying.setOnClickListener(view -> {
getActivity().getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment,new HomeFragment())
.commit();
I have this code for open some Message Fragment.
private void openMessage(int position) {
MessageRecord item = data.get(position);
item.setIsRead(true);
item.save();
List<MessageRecord> tmp = new ArrayList<>(data);
updateScreen(tmp);
MessagesActivity2 parentActivity = ((MessagesActivity2) context);
parentActivity.fab.hide();
FragmentTransaction ft = parentActivity.getSupportFragmentManager().beginTransaction();
ft.addToBackStack(null);
MessageFragment fragment1 = MessageFragment.newInstance(item);
ft.add(R.id.frame, fragment1);
ft.commit();
}
And this line hides my fab.
parentActivity.fab.hide();
But I can't figure out how to reopen my FAB after I press Back button and return to the view of the activity.
Override onBackPressed() in the activity and inside check if the fragment is null or not as per your requirement, then hide your FAB.
Instead of adding FAB on your Activity directly,add FAB on a fragment(FABFragment) and add another fragment(MessageFragment) for your message.
So whenever you want to show MessageFragment replace the FABFragment using following code:
MessageFragment fragment1 = MessageFragment.newInstance(item);
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.addToBackStack(null);
ft.replace(R.id.frame, fragment1);
To communicate between your fragments use interfaces(https://developer.android.com/training/basics/fragments/communicating.html)
I'm a beginner in Android programming.So i'm going through some Sample Projects and Blogs.I came up on this code , which i want to know why is it used ?
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
InterpolatorFragment fragment = new InterpolatorFragment();
transaction.replace(R.id.sample_content_fragment, fragment);
transaction.commit();
}
}
transaction.replace(R.id.sample_content_fragment, fragment);
This tells that in sample_content_fragment FrameLayout remove the current displaying fragment and show new fragment fragment (second parameter)
transaction.commit();
This tells that everything is done with fragment and this is right time to replace the fragment
for more details see this link
I have a Layout were i keep swapping my two Fragments MainFragment and SecondFragment
I have an Activity Level Button and with its onclick I swap these fragments in the layout.
But I need to keep the same instance of FragA every time I switch back from FragB.
Below is the code that i used but the application crashes with a NullPointerError.
// When journey button menu is clicked [INSIDE THE MAIN ACTIVITY]
OnClickListener journeyBtnClick = new OnClickListener() {
#Override
public void onClick(View arg0) {
if(currentType==0){
InitThisFragment(1);
}else{
InitThisFragment(0);
}
}
};
private int currentType=0;
public void InitThisFragment(int type){
if(type==0){
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
//get the previously added MainFragment from the BackStack
Fragment mainFragment= getSupportFragmentManager().findFragmentByTag("main");
transaction.replace(R.id.abs_fragment_container,mainFragment);
transaction.setTransition(FragmentTransaction.TRANSIT_ENTER_MASK);
transaction.commit();
}else{
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.abs_fragment_container, new SecondFragment());
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
transaction.commit();
}
currentType=type;
}
Before this I initialize the MainFragment in the OnCreate() of my Activity class;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.abs_fragment_container, new MainFragment());
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN); //add MainFragment in the BackStack
transaction.addToBackStack("main");
transaction.commit();
}
I the user clicks the Button
Initiate a New Fragment of the SecondFragment [No History of the
Previous Fragment]
Go Back to the MainFragment [In same state as it was while leaving
it]
Please help!
Thanks in advance.
If I have understood what you want to do, you can just call "FragmentManager.popBackStack()" if you are in the secondFragment.
So:
public void InitThisFragment(int type){
if(type==0){
getFragmentManager().popBackStack();
}else{
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.abs_fragment_container, new SecondFragment());
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
transaction.commit();
}
currentType=type;
}
Put "main" tag in replace method.
transaction.replace(R.id.abs_fragment_container, new MainFragment(),"main");
tag parameter would work different for addToBackStack and replace method. According to android for tag parameter :
addToBackStack: An optional name for this back stack state, or null.
replace: Optional tag name for the fragment, to later retrieve the fragment with FragmentManager.findFragmentByTag(String).