Develop Reference

How to replace a fragment in jetpack navigation component?

val action = LoginFragmentDirections.actionLoginFragmentToHomeFragment(
User(
_binding.emailEt.editText?.text.toString(),
_binding.passwordEt.editText?.text.toString()
)
)
findNavController().navigate(action)
This is my Button press action
<?xml version="1.0" encoding="utf-8"?>
<navigation 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/nav_graph"
app:startDestination="#id/loginFragment">
<fragment
android:id="#+id/loginFragment"
android:name="com.example.passion.ui.LoginFragment"
android:label="fragment_logins"
tools:layout="#layout/fragment_logins">
<action
android:id="#+id/action_loginFragment_to_homeFragment"
app:destination="#id/homeFragment" />
</fragment>
<fragment
android:id="#+id/homeFragment"
android:name="com.example.passion.ui.HomeFragment"
android:label="fragment_home"
tools:layout="#layout/fragment_home" >
<argument
android:name="user"
app:argType="com.example.passion.data.models.User"
app:nullable="true"
android:defaultValue="#null" />
</fragment>
</navigation>
This is my navigation graph
Everytime I press button. it adds the fragment. I want to replace it with HomeFragment
Any help would be appreciated!. thanks

Reload Fragment after popBackStack

I need reload fragment after this process
Go from Fragment A to Fragment B and go from Fragment B to Fragment C, then do the registration process, and after the registration is correct, popBackStack Fragment A and my Fragment A will be reloaded.
My main problem is that Fragment A is not reloaded
Please help me

you can use navigation component library for solve this problem!
this will be your nav_graph.xml
<?xml version="1.0" encoding="utf-8"?>
<navigation 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/nav_graph"
app:startDestination="#id/AFragment">
<fragment
android:id="#+id/AFragment"
android:name="ir.inbo.navigationComponenetBug.AFragment"
android:label="AFragment"
tools:layout="#layout/fragment_a">
<argument
android:name="someLong"
app:argType="long" />
<action
android:id="#+id/action_AFragment_to_BFragment"
app:destination="#id/BFragment" />
</fragment>
<fragment
android:id="#+id/BFragment"
android:name="ir.inbo.navigationComponenetBug.BFragment"
android:label="BFragment"
tools:layout="#layout/fragment_b">
<argument
android:name="someLong"
app:argType="long" />
<action
android:id="#+id/action_BFragment_to_CFragment"
app:destination="#id/CFragment" />
</fragment>
<fragment
android:id="#+id/CFragment"
android:name="ir.inbo.navigationComponenetBug.CFragment"
android:label="CFragment"
tools:layout="#layout/fragment_c" >
<argument
android:name="someLong"
app:argType="long" />
<action
android:id="#+id/action_CFragment_to_AFragment"
app:destination="#id/AFragment"
app:popUpTo="#id/AFragment"
app:popUpToInclusive="true" />
</fragment>
</navigation>
and in AFragment you must move your logic to onViewCreated or onCreateView because of the fragment life cycle when you navigate from AFragment to Bfragment, Afragment's view will be destroyed and when you come back to Afragment from Cfragment, onViewCreated and onViewCreate will be called
and this is google example for your exact use case

NavHostFragment Manager backstack is not proper

I am using navigation architecture component in my application.
Suppose I have fragment A as start destination.
I have push fragment B and Fragment C via navigation controller.
My navigation back stack is A-> B-> C.
Then I navigate to Fragment A with below action
<action
android:id="#+id/fragment_A_type"
app:destination="#id/fragment_a"
app:popUpTo="#id/fragment_a"
app:popUpToInclusive="true" />
Now My navigation back stack should be A.
But if check
parentFragmentManager.fragments back stack is
A->A
Also the swipeBackDismiss of activity is not working.
my navigation.xml file
<?xml version="1.0" encoding="utf-8"?>
<navigation 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/nav_graph">
<fragment
android:id="#+id/FirstFragment"
android:name="com.example.wearexample1.FirstFragment"
android:label="#string/first_fragment_label"
tools:layout="#layout/fragment_first">
<action
android:id="#+id/action_FirstFragment_to_SecondFragment"
app:destination="#id/SecondFragment" />
</fragment>
<fragment
android:id="#+id/SecondFragment"
android:name="com.example.wearexample1.SecondFragment"
android:label="#string/second_fragment_label"
tools:layout="#layout/fragment_second">
</fragment>
<action
android:id="#+id/action_global_activity_type"
app:destination="#id/FirstFragment"
app:popUpTo="#id/FirstFragment"
app:popUpToInclusive="true" />
</navigation>

Android Navigation Components always returns to the start destination

I'm using the Navigation Component and I have 1 Activity with 3 fragments (startDestination: mainFragment , levelFragment and gameFragment). if I'm in levelFragment, it returns to mainFragment, and if I'm in gameFragment it should return to levelFragment, but it returns to mainFragment instead.
I followed the documentation in order to solve the problem but I didn't find any solutions and it's still happening, Why?
Note: gameFragment returns to levelFragment(it appears for just a split second) then immediately returns to mainFragment.
Here's my navigation.xml :
<navigation 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/main_nav"
app:startDestination="#id/mainFragment">
<fragment
android:id="#+id/mainFragment"
android:name="com.hroub.physicsapp.MainFragment"
android:label="fragment_main"
tools:layout="#layout/fragment_main" >
<action
android:id="#+id/action_mainFragment_to_levelFragment"
app:destination="#id/levelFragment"
app:enterAnim="#android:anim/fade_in"
app:exitAnim="#android:anim/fade_out"
app:popEnterAnim="#android:anim/fade_in"
app:popExitAnim="#android:anim/fade_out" />
</fragment>
<fragment
android:id="#+id/gameFragment"
android:name="com.hroub.physicsapp.GameFragment"
android:label="fragment_game"
tools:layout="#layout/fragment_game" >
<argument
android:name="index"
app:argType="integer"
android:defaultValue="0" />
<argument
android:name="concept"
app:argType="com.hroub.physicsapp.model.Concept" />
<action
android:id="#+id/action_gameFragment_to_levelFragment"
app:destination="#id/levelFragment"
app:popUpTo="#id/levelFragment"
app:popUpToInclusive="true"
/>
</fragment>
<fragment
android:id="#+id/levelFragment"
android:name="com.hroub.physicsapp.LevelFragment"
android:label="fragment_level"
tools:layout="#layout/fragment_level" >
<action
android:id="#+id/action_levelFragment_to_gameFragment"
app:destination="#id/gameFragment"
app:enterAnim="#android:anim/fade_in"
app:exitAnim="#android:anim/fade_out"
app:popEnterAnim="#android:anim/fade_in"
app:popExitAnim="#android:anim/fade_out" />
<argument
android:name="position"
app:argType="integer"
android:defaultValue="0" />
</fragment>
Code to navigate to levelFragment :
MainFragmentDirections.ActionMainFragmentToLevelFragment action = MainFragmentDirections.actionMainFragmentToLevelFragment();
action.setPosition(getLayoutPosition());
Navigation.findNavController((Activity)context, R.id.main_host).navigate(action);
Code to navigate to gameFragment :
LevelFragmentDirections.ActionLevelFragmentToGameFragment action = LevelFragmentDirections.actionLevelFragmentToGameFragment(concept);
action.setIndex(getLayoutPosition());
action.setConcept(concept);
Navigation.findNavController((Activity)context, R.id.main_host).navigate(action);
from gameFragment to levelFragment :
Navigation.findNavController(requireActivity(), R.id.main_host).navigate(R.id.action_gameFragment_to_levelFragment);

Navigate from one activity to another with Navigation Component

I am trying to navigate from one navigation graph (with the host fragment on the LoginActivity) to another navigation graph (with the host fragment on the HomeActivity). I know Google is advocating for single activity applications and thus I am only going to be using these two Activities (to keep it minimal).
My login_navigation.xml
<?xml version="1.0" encoding="utf-8"?>
<navigation 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/mobile_navigation"
app:startDestination="#id/nav_login">
<fragment
android:id="#+id/nav_login"
android:name="your.appname.LoginFragment"
android:label="#string/login_menu"
tools:layout="#layout/fragment_login" >
<action
android:id="#+id/action_nav_login_to_enterCellphone"
app:destination="#id/login_enter_cellphone"
app:popUpTo="#id/nav_login" />
</fragment>
<fragment
android:id="#+id/login_enter_cellphone"
android:name="your.appname.LoginEnterCellphoneFragment"
android:label="#string/enter_cellphone_fragment_label"
tools:layout="#layout/fragment_login_enter_cellphone" >
<action
android:id="#+id/action_enter_cellphone_to_enterOTPFragment"
app:destination="#id/enterOTPFragment"
app:popUpTo="#id/login_enter_cellphone" />
</fragment>
<fragment
android:id="#+id/enterOTPFragment"
android:name="your.appname.EnterOTPFragment"
android:label="#string/enter_otp_label"
tools:layout="#layout/fragment_enter_o_t_p" >
<action
android:id="#+id/action_enterOTPFragment_to_main_navigation"
app:destination="#id/main_navigation"
app:launchSingleTop="false" />
</fragment>
<include app:graph="#navigation/main_navigation" />
</navigation>
And main_navigation.xml
<?xml version="1.0" encoding="utf-8"?>
<navigation 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/main_navigation"
app:startDestination="#id/nav_home">
<fragment
android:id="#+id/nav_home"
android:name="your.appname.HomeFragment"
android:label="Home"
tools:layout="#layout/fragment_home" />
<fragment
android:id="#+id/nav_profile"
android:name="your.appname.ProfileFragment"
android:label="#string/profile_menu"
tools:layout="#layout/fragment_profile" />
</navigation>
I found this answer and implemented it as follows
private fun navigateToHomeActivity() {
val action = EnterOTPFragmentDirections.actionEnterOTPFragmentToMainNavigation()
findNavController().navigate(action)
(activity as LoginActivity).finish() <-- later commented out
}
but it gives me the following error E/InputMethodManager: prepareNavigationBarInfo() rootView is null
If I comment out the above line the error goes away but it only replaces the current fragment with the HomeFragment.
How do I navigate to another Activity so that the source Activity is removed (Can't navigate back to it) and the Destination Activity is used?

You can define 2 navigation graphs:
ActivityA with navigation Graph A
ActivityB with navigation Graph B
In the GraphA you can define a destination to start ActivityB
<!-- Graph A -->
<navigation
....
<activity
android:id="#+id/activityB"
android:name=".ActivityB"
...>
<argument
.... />
</activity>
</navigation>
Then you can navigate to that activity ( = startActivity(intent)) using it like a destination:
Navigation.findNavController(view).navigate(R.id.activityB);
More info here.