What is the best way to work with android fragment backstack?

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I am working with multiple fragments with only one Activity and I want to know how to manage fragment backstack on back press (the best way)

Any link or little explanation with some code can be helpful

Example fragment backstack on back press :

FragmentsActivity is the activity which will be the container for all your fragments, so override FragmentsActivity's onBackPressed() like this -

override fun onBackPressed() {
        val fm = supportFragmentManager
        if (fm.backStackEntryCount > 0) { //if backstack contain any fragment than pop it
            fm.popBackStack()
        } else {                          // call super function normally 
            super.onBackPressed()
        }
    }

Now whenever launch a fragment like this -

//If you don't want it in backstack
supportFragmentManager.beginTransaction()
.replace(R.id.fragment_container, FragmentA())
.commit() 

//If you want it in backstack
supportFragmentManager.beginTransaction()
.replace(R.id.fragment_container, FragmentA())
.addToBackStack(null)           //null or any String TAG you want
.commit() 

Simplified Fragment Navigation, using a custom backstack and , This is no good. Look up fragment backstack doesn't work site:stackoverflow.​com. from http://hahack.com/wiki/android-fragment.html and FragmentTransaction have a few convenient methods, more than just your typical​  We use the addToBackStack method of the FragmentTrasaction and we add every fragment to the backstack. In this way when we tap the back button we have the correct behavior. In this post, you learned how to handle Android fragment transaction and how to manage fragments.

All you need to make sure you call .addToBackStack(null) in Fragment Manager and Fragment Transaction

What is the best way to work with android fragment backstack , Example fragment backstack on back press : FragmentsActivity is the activity which will be the container for all your fragments, so override  One scenario where this matters is if Fragment A links to Fragment B1 which is replaced by Fragment B2. THEN if want "Back" button to go back to Fragment A (instead of to B1), we have to code that manually, because Android's back will [incorrectly IMHO] do "remove B1, add A" - the opposite of the original link from A to B1. B2 lurks in viewbehind.

I'll suggest you to use Android Jetpack Navigation. A new and improved way to handle fragment transactions. This is way better than the old FragmentTransaction class method. It is highly recommended by Google itself. And I'm also learning it nowadays. There's a tutorial below.

Android Jetpack - Navigation

Fragments - Part 5, Story of back stack, Android introduced Fragments in order to support better view navigation across and how to use FragmentOperator to make your life as an Android developer a  Android set clickable text to go one fragment to another fragment. java,android,android-fragments,spannablestring. If LoginActivity is a fragment class then it would be okay is you use setOnClickListener on textview.

Backpress on Fragments

Need your fragment to be notified when user presses back button?

The Dumb Way :

MyFragment.kt

requireActivity().onBackPressedDispatcher.addCallback(this,
    object : OnBackPressedCallback(true) {
        override fun handleOnBackPressed() {
            // user pressed back button
        }
    })

The Rockstar Developer Way :

Add this dependency:

https://developer.android.com/reference/kotlin/androidx/activity/OnBackPressedDispatcher.html

implementation 'androidx.activity:activity-ktx:1.0.0-rc01'

requireActivity().onBackPressedDispatcher.addCallback(this) {
    // user pressed back button
}

Managing Android Fragment Backstack Through Tags, Android OS provide back stack function for Activity, it also provide back stack function for Fragment. You can use below code to put a fragment into back stack. This is a util java class which provide methods to get exist fragment by it's Studio Android UI Best Practice CentOS CSV Eclipse File Fragment  @Akki if you are using add to backstack it will already pop the last fragment added when you hit the back navigation item. So no extra steps are necessary to perform a normal navigation back. Only time you need to override on back button pressed is when you want to do something other than a normal one step back navigation. – ocross Jul 9 '14 at 19:44

The common answer for this query is to pop the backstack or navigate up to previous activity. What if you dont want to pop the backstack on a certain fragment?

Override your onbackpressed to handle these conditions:

override fun onBackPressed() {

    when(supportFragmentManager.fragments[0].javaClass.simpleName){
        "FragmentOne" -> doActionOne()
        "FragmentTwo" -> doActionTwo()
        ...
        else -> supportFragmentManager.popBackStack()
    }
}

this gets your name of your current fragment and then you decide what you would want to do. For example maybe for one of the fragments you want a dialog to ask "are you sure you want to leave?" ect.

Android Fragment Back Stack Example, For more information about these methods and others, refer to the FragmentManager class documentation. As demonstrated in the previous  private void animateToFragment(Fragment newFragment, String tag) { FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.replace(R.id.fragment_container, newFragment, tag); ft.addToBackStack(null); ft.commit(); } What is the best way to return to the previous fragment that was visible?

Fragments, I am having troules understanding how fragments work in saving and restoring data and other things. what would be the difference between  Fragments are a powerful feature of good Android UI that allow you to approach app design in a modular manner. These are distinct views that can contain entire layouts and that come with their own

Fragments backstack working, Fragments in Android are many things to different people. In my experience, the best way to work with such fully featured and complex APIs  As was already mentioned you are stacking items up on a backstack so it’s expected that there will be at least a little bit of a memory footprint but you can minimize the footprint by cleaning up resources when the fragment is out of view with the above technique.

Simplifying the FragmentManager API: Multiple Fragment , and then you can use the FragmentManager to create a FragmentTransaction a fragment perform an action after initialization, the easiest way is by having the  The way Android manages tasks and the back stack, as described above—by placing all activities started in succession in the same task and in a "last in, first out" stack—works great for most apps and you shouldn't have to worry about how your activities are associated with tasks or how they exist in the back stack.