Add following line to root build.gradle

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

and line to modul level build.gradle

dependencies {
    implementation 'com.github.DimaKron:Android-MultiStacks:1.2'
}

Initialize component with Builder in your main navigation activity

multiStacks = MultiStacks.Builder(supportFragmentManager, R.id.containerLayout)
            .setState(savedInstanceState)
            .setRootFragmentInitializers(fragmentInitializers)
            .setSelectedTabIndex(0)
            .setTabHistoryEnabled(true)
            .setTransactionListener(this)
            .build()

Override method of navigation activity

override fun onSaveInstanceState(outState: Bundle) {
        multiStacks.saveInstanceState(outState)
        super.onSaveInstanceState(outState)
}

Call method to perform back action (close fragment or back to other tab)

...
 multiStacks.onBackPressed()
...

Use following methods for navigation managent

• setSelectedTabIndex(Int) change tab
• push(Fragment) add new fragment to current tab
• replace(Fragment) replace current with new fragment
• popFragments(Int) remove X last fragments of current stack
• clearStack(Class?) remove all fragments of current stack until first or specified fragment

Your fragment should implements getIdentifierInStack() of IMultiStackFragmentinterface

Enable tabs history with MultiStack.Builder.setTabHistoryEnabled(true)