There are many answers to that question in Java language, but I can not apply it
using Kotlin.
I use ViewPager to switch between tabs and I want MainActivity title to be changed every time when I swipe.
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
container.adapter = TabPagerAdapter(supportFragmentManager)
container.addOnPageChangeListener(TabLayout.TabLayoutOnPageChangeListener(tabs))
tabs.addOnTabSelectedListener(TabLayout.ViewPagerOnTabSelectedListener(container))
}
override fun setTitle(title: CharSequence?) {
supportActionBar?.title = title
}
}
I use "kotlin-android-extensions", so container is id of ViewPager and tabs is id of TabLayout. I also created class TabPagerAdapter that extends FragmentPagerAdapter. It returns correct tab, which is Fragment derivative, with getItem method. I tried to achieve my goal by overriding getPageTitle method but it doesn't work.
class TabPagerAdapter(fragmentManager: FragmentManager) :
FragmentPagerAdapter(fragmentManager) {
override fun getItem(p0: Int): Fragment {
return when (p0) {
else -> TestTab.newInstance()
}
}
override fun getPageTitle(position: Int): CharSequence? {
return "test title"
}
override fun getCount(): Int {
return 1
}
}
My tab example:
class NotificationsTab : Fragment() {
private val _title = "Notifications"
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_notifications, container, false)
}
companion object {
fun newInstance(): NotificationsTab {
return NotificationsTab()
}
}
}
I want variable _title to be the MainActivity title.
XMLs that I use:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.androidtest.activities.MainActivity"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="63"
app:elevation="0dp">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="50"
android:background="#ffffff"
app:layout_scrollFlags="scroll|enterAlways"
app:title="#string/app_name">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:background="#ffffff"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="50"
app:tabIndicatorColor="#color/tabIndicatorColor"
app:tabIndicatorHeight="3dp">
<android.support.design.widget.TabItem
android:id="#+id/tab_profile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"/>
<android.support.design.widget.TabItem
android:id="#+id/tab_notifications"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"/>
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_weight="390"
android:background="#ffffff"
android:layout_width="match_parent"
android:layout_height="0dp"/>
</LinearLayout>
fragment_notifications.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:text="notifications"
android:layout_gravity="center"
android:textAlignment="center"
android:textSize="56sp"
android:layout_height="wrap_content"/>
</LinearLayout>
As I understand when users swipe between tabs, you will set the tab's text as title of the activity. Here is a solution
First remove all TabItem tags from activity_main.xml layout file because you are using TabLayout with ViewPager. The ViewPager will handle how to setup tab (number of tabs, fragment at each tab, title at each tab, etc).
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:background="#ffffff"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="50"
app:tabIndicatorHeight="3dp">
<!--<android.support.design.widget.TabItem-->
<!--android:id="#+id/tab_profile"-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:text="1"/>-->
<!--<android.support.design.widget.TabItem-->
<!--android:id="#+id/tab_notifications"-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:text="2"/>-->
</android.support.design.widget.TabLayout>
Then change your code in MainActivity
container.adapter = TabPagerAdapter(supportFragmentManager)
// Comment-out or remove these lines
// container.addOnPageChangeListener(TabLayout.TabLayoutOnPageChangeListener(tabs))
// tabs.addOnTabSelectedListener(TabLayout.ViewPagerOnTabSelectedListener(container))
// Pass viewpager to tablayout to setup tabs.
tabs.setupWithViewPager(container)
// Handle event when users swipe to a tab, here we set tab's text as title of the activity.
tabs.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
override fun onTabSelected(tab: TabLayout.Tab) {
title = tab.text // the value of tab's text is the returned value from `getPageTitle` method in TabPagerAdapter class.
}
override fun onTabUnselected(tab: TabLayout.Tab?) {
}
override fun onTabReselected(tab: TabLayout.Tab?) {
}
})
// For the first time open the app, we set first tab's title as title of this activity
title = container.adapter!!.getPageTitle(0)
viewPagerAtmosphericInfo.addOnPageChangeListener(object: ViewPager.OnPageChangeListener{
override fun onPageScrollStateChanged(state: Int) {
}
override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
}
override fun onPageSelected(position: Int) {
// code here
})
If you want to set the title of your activity with tabs, You have to set the title of activity(s) actionbar which you can set from fragment by using activity instance.
Example :
//initialize activity instance
lateinit var mActivity: AppCompatActivity
//get activity inside your onViewCreated of fragment
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
mActivity = activity as MainActivity
}
// inside your fragment
override fun setUserVisibleHint(isVisibleToUser: Boolean) {
super.setUserVisibleHint(isVisibleToUser)
if(isVisibleToUser){
//change your title from here, make sure that activity is not null
mActivity.supportActionBar?.title = "Your Title"
}
}
Let me now if you have any query! :)
Related
The following problem occurred with me after migration from viewPager to viewPager2 - when I open my app, the tablyout indicator is missing by default. But if you make some swiping, the indicator will appears! Looks weird, because I made everything correct. There are my simplified Kotlin-code:
class ScheduleWeekFragment : ScheduleBaseFragment<ScheduleWeekViewModel>(ScheduleWeekViewModel::class) {
private val viewBinding by viewBinding(FragmentWeekBinding::bind)
private var titles: Array<String>? = null
// listeners
private val viewPagerListener = object : ViewPager2.OnPageChangeCallback() {
override fun onPageSelected(position: Int) {
viewModel.updateDayTitle(position)
}
}
// observers
private val selectedDayObserver = Observer<Int> {
viewBinding.viewPager2.currentItem = it
}
// lifecycle
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
titles = context?.resources?.getStringArray(R.array.schedule_fragment_day_abbreviations)
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? =
inflater.inflate(R.layout.fragment_week, container, false)
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
viewBinding.viewPager2.adapter = ScheduleViewPagerAdapter(this)
viewBinding.viewPager2.setPageTransformer(ZoomOutPageTransformer)
TabLayoutMediator(viewBinding.tabLayout, viewBinding.viewPager2) { tab, position ->
tab.text = titles?.getOrNull(position)
}.attach()
// observers
viewModel.viewPagerPosition.observe(viewLifecycleOwner, selectedDayObserver)
// listeners
viewBinding.viewPager2.registerOnPageChangeCallback(viewPagerListener)
}
override fun onDestroyView() {
viewBinding.viewPager2.unregisterOnPageChangeCallback(viewPagerListener)
super.onDestroyView()
}
}
And there is my simplified xml-code:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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/fragmentWeek"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimary"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabLayout"
style="#style/TabLayout1"
android:layout_width="match_parent"
android:layout_height="40dp"
android:verticalScrollbarPosition="left"
app:layout_constraintEnd_toEndOf="#+id/viewPager2"
app:layout_constraintStart_toStartOf="#+id/viewPager2"
app:layout_constraintTop_toBottomOf="#+id/scheduleToolbar"
app:tabGravity="start"
app:tabMode="scrollable"
android:background="#color/white"
tools:ignore="SpeakableTextPresentCheck" />
<androidx.viewpager2.widget.ViewPager2
android:id="#+id/viewPager2"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="#color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/tabLayout"
tools:ignore="SpeakableTextPresentCheck" />
</androidx.constraintlayout.widget.ConstraintLayout>
The problem was inside my observer:
private val selectedDayObserver = Observer<Int> {
// viewBinding.viewPager2.currentItem = it // wrong!
viewBinding.viewPager2.setCurrentItem(it, false) // correct!
}
I didn't find why in the official docs, but difference exists: the first variant works good with viewpager1, but for viewpager2, be careful and use the second complex variant.
I'm trying to implement viewpager2 in a fragment which shows a list of notes with Recycler View. I tried different solutions but I'm unable to figure it out.
Here is my fragment_notes_list.xml :
<androidx.recyclerview.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/notes_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
list_item_notes.xml used to display recycler view viewholder:
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_pertanyaan"
android:layout_width="match_parent"
android:layout_height="96dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="12dp"
android:layout_marginRight="16dp"
android:clickable="true"
android:foreground="?selectableItemBackground"
card_view:cardBackgroundColor="#595959"
card_view:cardCornerRadius="8dp"
card_view:contentPadding="10dp">
<androidx.constraintlayout.widget.ConstraintLayout 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/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/notes_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:text="Title"
android:textColor="#color/white"
app:layout_constraintBottom_toTopOf="#+id/notes_body"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_chainStyle="packed" />
<TextView
android:id="#+id/notes_body"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:textColor="#color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/notes_title" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
Relevant snippets from fragment class NotesListFragment.kt :
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.fragment_notes_list, container, false)
notesRecyclerView =
view.findViewById(R.id.notes_recycler_view) as RecyclerView
registerForContextMenu(notesRecyclerView)
notesRecyclerView.layoutManager = LinearLayoutManager(context)
notesRecyclerView.adapter = adapter
return view
}
private inner class ScreenSlidePagerAdapter(fa: Fragment) : FragmentStateAdapter(fa) {
override fun getItemCount(): Int = NUM_PAGES
override fun createFragment(position: Int): Fragment {
return if (position == 0) {
NotesListFragment()
} else {
CalenderFragment()
}
}
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
notesListViewModel.notesListLiveData.observe(
viewLifecycleOwner,
Observer { notes ->
notes?.let {
Log.i(TAG, "got notes")
updateUI(notes)
}
})
}
private inner class NotesAdapter(var notes: List<Notes>) : RecyclerView.Adapter<NotesHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): NotesHolder {
val view = layoutInflater.inflate(R.layout.list_item_notes, parent, false)
/* viewPager = view.findViewById(R.id.pager)
val pagerAdapter = ScreenSlidePagerAdapter(this#NotesListFragment)
viewPager.adapter = pagerAdapter */
return NotesHolder(view)
}
override fun getItemCount() = notes.size
override fun onBindViewHolder(holder: NotesHolder, position: Int) {
val note = notes[position]
holder.bind(note)
}
}
I'm confused should I add ViewPager2 with FrameLayout in list_item_notes.xml?
But then how can I implement ScreenSliderPagerAdapter for it?
I assume you would like to have 2 fragments: list and calendar and thats why you need to implement ViewPager2. Your NotesListFragment looks good. You have recyclerview with notes there, but what you want now is to provide list of NotesListFragment and CalendarFragment which will be scrollable in left/right direction. First, extract ScreenSlidePagerAdapter outside of your fragment code. Next you have to add ViewPager2 to your parent activity/fragment
<androidx.viewpager2.widget.ViewPager2
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
And then in your parent activity/fragment pair it with adapter like this way:
val viewPager = findViewById(R.id.pager)
val pagerAdapter = ScreenSlidePagerAdapter(this)
viewPager.adapter = pagerAdapter
You can read more about this in official docs: https://developer.android.com/training/animation/screen-slide-2
I had tried implementing ViewPager in Main Activity earlier also. But this way i cannot close viewpager fragments since they are always visible. How do I get around this?
here is my main activity after the changes you suggested:
class MainActivity : AppCompatActivity(),
NotesListFragment.Callbacks {
private lateinit var viewPager: ViewPager2
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
viewPager = findViewById(R.id.pager)
val pagerAdapter = ScreenSlidePagerAdapter(this)
viewPager.adapter = pagerAdapter
}
override fun onNotesSelected(notesId: UUID) {
val fragment = NotesFragment.newInstance(notesId)
supportFragmentManager
.beginTransaction()
.replace(R.id.fragment_container, fragment)
.addToBackStack(null)
.commit()
}
fun onNotesDeleted(notes: Notes) {
val fragment = NotesListFragment()
supportFragmentManager
.beginTransaction()
.replace(R.id.fragment_container, fragment)
.commit()
Toast.makeText(this, "Note Deleted", Toast.LENGTH_SHORT).show()
}
mainactivity.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.viewpager2.widget.ViewPager2
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/pager"/>
</FrameLayout>
here are some screenshots,
https://drive.google.com/drive/folders/13ITZqcaeDeydCe0tW2Iu7VoSGSZnrlkg?usp=sharing
Solved the problem.
Since, I was unable to add Viewpager with recycler view of NotesListFragment, I made another Parent Fragment with viewpager and put NotesListFragment inside it.
I have the Figma model, but can't do right, in all cases that I've tried, I've got too wide tab indicator or too compressed. I think, maybe exist some solution to add extra space between tabs. I can`t add the image to this post, i put link on my google photo. You will see 2 photo, left photo - What i need
https://photos.app.goo.gl/CiwR7DemvCcQxWFz6
XML for
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".activity.QuizActivity">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="90dp"
android:background="#color/colorBolotoButton"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
<TextView
android:id="#+id/textViewToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_marginRight="120dp"
android:fontFamily="#font/bellota_bold"
android:gravity="center_vertical"
android:text="Проверим знания!"
android:textColor="#color/cardview_light_background"
android:textSize="24dp" />
</androidx.appcompat.widget.Toolbar>
<com.google.android.material.tabs.TabLayout
android:layout_marginTop="16dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:layout_width="wrap_content"
android:id="#+id/tabLayout"
app:tabGravity="center"
android:layout_gravity="center_horizontal"
app:tabIndicatorGravity="center"
app:tabMode="fixed"
app:tabIndicator="#drawable/circle"
app:tabIndicatorColor="#color/colorBolotoButton"
app:tabIndicatorHeight="32dp"
android:clipToPadding="true"
app:tabSelectedTextColor="#color/colorWhite"
android:clickable="false" >
</com.google.android.material.tabs.TabLayout>
<androidx.viewpager2.widget.ViewPager2
android:id="#+id/quizViewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp" />
</LinearLayout>
Adapter
class QuizAdapter(activity: AppCompatActivity, val itemsCount: Int)
: FragmentStateAdapter(activity) {
override fun getItemCount(): Int {
return itemsCount
}
override fun createFragment(position: Int): Fragment {
return QuizFragment.getinstance(position)
}
}
Activity
class QuizActivity : AppCompatActivity() {
private var testArray = arrayListOf("1", "2", "3", "4", "5", "6", "7", "8")
// private var QuizPageChangeCallback = object : ViewPager2.OnPageChangeCallback() {
// override fun onPageSelected(position: Int) {
// Toast.makeText(this#QuizActivity, "Selected position: ${position}",
// Toast.LENGTH_SHORT).show()
// }
// }
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_test)
val viewPager: ViewPager2 = findViewById(R.id.quizViewPager)
val pagerAdapter = QuizAdapter(this, testArray.size)
viewPager.adapter = pagerAdapter
/*
Method for concatenation ViewPager and tabLayout
*/
TabLayoutMediator(tabLayout, quizViewPager) { tab, position ->
tab.text=testArray[position]
}.attach()
Fragment
class QuizFragment : Fragment() {
companion object {
const val ARG_PAGE = "ARG_PAGE"
// Method for creating new instances of the fragment
fun getinstance(page: Int): QuizFragment {
val fragment = QuizFragment()
val args = Bundle()
args.putInt(ARG_PAGE, page)
fragment.arguments = args
return fragment
}
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
val position = requireArguments().getInt(ARG_PAGE) + 1
textViewFragment.text = "Fragment #$position"
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val viewfragment = inflater.inflate(R.layout.fragment_page, container, false)
var position = requireArguments().getInt(ARG_PAGE)
val textView = viewfragment.findViewById<TextView>(R.id.textViewFragment)
textView.setText("Fragment #${++position}")
return viewfragment
}
}
I found an interesting feature in one of the applications, I want to repeat it. The application has ViewPager and TabLayout and a bunch of fragments inside.
On the first fragment there is a button img1
, by pressing it, the fragment is replaced by another img2
while ads_banner is removed and the toolbar is replaced,
and when swiping to the right and back, it shows fragment1, please tell me how this can be done. Here is what I already wrote:
MainActivity
class MainActivity : AppCompatActivity() {
private var mAdView: AdView? = null
#SuppressLint("ResourceType")
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val adRequest = AdRequest.Builder().build()
mAdView = findViewById(R.id.adView)
mAdView!!.loadAd(adRequest)
initTab()
}
fun initTab() {
tab_layout.addTab(tab_layout.newTab().setIcon(R.drawable.image1)
tab_layout.addTab(tab_layout.newTab().setIcon(R.drawable.image2)
tab_layout.addTab(tab_layout.newTab().setIcon(R.drawable.image3)
tab_layout.tabGravity = TabLayout.GRAVITY_FILL
val adapter = MyPagerAdapter(supportFragmentManager, tab_layout.tabCount)
pager.adapter = adapter
pager.offscreenPageLimit = 2
pager.addOnPageChangeListener(TabLayout.TabLayoutOnPageChangeListener(tab_layout))
tab_layout.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
override fun onTabSelected(tab: TabLayout.Tab) {
pager.currentItem = tab.position
if (tab.position == 0) {
tab_layout.getTabAt(0)!!.setIcon(R.drawable.image1_focus)
}
if (tab.position == 1) {
tab_layout.getTabAt(1)!!.setIcon(R.drawable.image2_focus)
}
if (tab.position == 2) {
tab_layout.getTabAt(2)!!.setIcon(R.drawable.image3_focus)
}
}
override fun onTabUnselected(tab: TabLayout.Tab) {
if (tab.position == 0) tab_layout.getTabAt(0)!!.setIcon(R.drawable.image1)
if (tab.position == 1) tab_layout.getTabAt(1)!!.setIcon(R.drawable.image2)
if (tab.position == 2) tab_layout.getTabAt(2)!!.setIcon(R.drawable.image3)
}
override fun onTabReselected(tab: TabLayout.Tab) {
}
})
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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/mainlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:fitsSystemWindows="true"
android:orientation="vertical"
tools:context=".MainActivity">
<com.google.android.gms.ads.AdView
android:id="#+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:background="#color/transparent"
app:adSize="SMART_BANNER"
app:adUnitId="#string/banner_key"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
style="#style/MyToolbar"
android:layout_width="match_parent"
android:layout_height="35dp"
android:layout_marginTop="2dp"
android:gravity="center"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/adView"
app:popupTheme="#style/AppTheme.PopupOverlay">
<TextView
android:id="#+id/toolbar_txt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:fontFamily="#font/sf_pro_display_regular"
android:textColor="#color/black"
android:textSize="24sp"
tools:layout_editor_absoluteX="206dp"
tools:layout_editor_absoluteY="7dp" />
</androidx.appcompat.widget.Toolbar>
<androidx.viewpager.widget.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="#+id/tab_layout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar" />
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#fff"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:tabBackground="#drawable/tab_color_selector"
app:tabIndicatorColor="#2196F3"
app:tabIndicatorGravity="top"
app:tabIndicatorHeight="4dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
MyPagerAdapter
class MyPagerAdapter(fm: FragmentManager, internal var mNumOfTabs: Int) : FragmentStatePagerAdapter(fm) {
override fun getItem(position: Int): Fragment {
when (position) {
0 -> {
return RootFragment()
// return Fragment1()
}
1 -> {
return Fragment2()
}
2 -> {
return Fragment3()
}
}
}
override fun getCount(): Int {
return mNumOfTabs
}
}
Fragment1
class Fragment1: Fragment() {
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater.inflate(R.layout.fragment_1, container, false)
return view
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
btnfr1.setOnClickListener {
val trans = fragmentManager!!.beginTransaction()
trans.replace(R.id.root_frame, Fragment4())
trans.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
trans.addToBackStack(null)
trans.commit()
}
}
RootFragment
class RootFragment : Fragment() {
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater.inflate(R.layout.root_fragment, container, false)
val transaction = fragmentManager!!.beginTransaction()
transaction.replace(R.id.root_frame, Fragment1())
transaction.commit()
return view
}
}
root_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/root_frame" >
</FrameLayout>
In Fragment1, only the button for calling Fragment4. Tried to do as here https://www.codexpedia.com/android/android-viewpager-fragment-swap/
it turned out to replace Fragment1 with Fragment4, but I don’t know how to reset Fragment4 when swiping and don’t understand how to replace Toolbar and remove ads.
The trick is that as RootFragment is the fragment on the 0th index, what you need to do is show the original fragment as a child fragment of RootFragment using fragment transactions via childFragmentManager.
This way, you can replace the children of RootFragment, without actually having to replace RootFragment itself inside the ViewPager.
You need to implement createFragment and getItemCount methods in MyPagerAdapter to supply instances of fragments as pages to ViewPager.
Modify MyPagerAdapter class as shown below and test:
class MyPagerAdapter(fm: FragmentManager, internal var mNumOfTabs: Int) : FragmentStatePagerAdapter(fm) {
override fun getItemCount(): Int = mNumOfTabs
override fun createFragment(position: Int): Fragment {
when (position) {
0 -> {
return RootFragment()
}
1 -> {
return Fragment2()
}
2 -> {
return Fragment3()
}
}
}
}
I have implemented BottomSheetDialogFragment into OptionsFragment.In which I have added viewpager so I can do swipe animation for SignInSignUpOptionsFragment which I want to add in viewpager and button to Swipe SignInSignUpOptionsFragment with different option. SignInSignUpOptionsFragment has options of Login(+ social accounts).
AccountFragment
login_btn.onClickListener( v -> {
OptionsFragment optionsFragment = new OptionsFragment(true);
optionsFragment.show(getChildFragmentManager(), "Login");
});
OptionsFragment
class OptionsFragment(private val isLogin: Boolean) : BottomSheetDialogFragment() {
private var fragmentView: View? = null
lateinit var viewPager: ViewPager
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
fragmentView = inflater.inflate(R.layout.signup_popover, container, false)
val pagerAdapter = MyPagerAdapter(childFragmentManager)
viewPager = fragmentView!!.findViewById(R.id.vpPager)
viewPager.adapter = pagerAdapter
viewPager.currentItem = 0
return fragmentView
}
}
class MyPagerAdapter(fragmentManager: FragmentManager?) : FragmentStatePagerAdapter(fragmentManager!!, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
// Returns total number of pages
override fun getCount(): Int {
return NUM_ITEMS
}
// Returns the fragment to display for that page
override fun getItem(position: Int): Fragment {
return when(position) {
0 -> SignInSignUpOptionsFragment.newInstance(true)
1 -> SignInSignUpOptionsFragment.newInstance(false)
else -> null!!
}
}
// Returns the page title for the top indicator
override fun getPageTitle(position: Int): CharSequence? {
return "Page $position"
}
companion object {
private const val NUM_ITEMS = 2
}
here's my layout file
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/utilityGrey2">
<androidx.viewpager.widget.ViewPager
android:id="#+id/vpPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="parent" />
<LinearLayout
android:id="#+id/login_no_account_group"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="24dp"
android:layout_marginLeft="21dp"
android:layout_marginRight="21dp"
android:layout_marginTop="52dp"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/vpPager">
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/switch_sign_up_description"
style="#style/HelpText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="#string/no_account" />
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/switch_sign_up"
style="#style/HelpText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="#string/sign_up_caps" />
</LinearLayout>
but I am not able to see any fragment inside ViewPager. Only bottom "login_no_account_group" is displaying as Bottomsheet. I don't want to use TabLayout, instead I want to change page on switch_sign_up click
viewPager.currentItem = 1
Is it possible ? any other alternative welcome as well