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‎app/build.gradle‎

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@@ -38,5 +38,6 @@ dependencies {
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implementation 'androidx.recyclerview:recyclerview:1.0.0'
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//support design
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implementation 'com.google.android.material:material:1.0.0-rc01'
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implementation project(path: ':bottomnavlibrary')
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}

‎app/src/main/AndroidManifest.xml‎

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@@ -10,7 +10,6 @@
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity
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android:name=".MainActivityNew">
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<intent-filter>
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<action android:name="android.intent.action.MAIN"/>

‎app/src/main/java/com/example/backstack_bottomnavigation/FragmentStack.kt‎

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package com.example.backstack_bottomnavigation
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import android.os.Build
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import android.util.ArrayMap
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import android.util.SparseArray
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import androidx.annotation.RequiresApi
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import androidx.fragment.app.Fragment
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import java.lang.Exception
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class FragmentStack {
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var arrayList: ArrayList<String>
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var count :Int=0
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constructor(count :Int){
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arrayList= ArrayList()
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this.count=count
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}
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companion object{
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private var stack_object:FragmentStack?=null
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fun getInstance(count :Int):FragmentStack{
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if (stack_object==null)
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stack_object= FragmentStack(count)
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return stack_object!!
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}
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}
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fun addAll(array: ArrayList<String> ?){
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arrayList.addAll(array!!)
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}
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fun push(tag:String){
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if (count==arrayList.size){
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if (remove(tag)){
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arrayList.add(tag)
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}
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}else{
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arrayList.add(tag)
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}
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}
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fun pop(tag: String):String?{
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if (remove(tag)){
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if (arrayList.size==0){
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return null
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}else{
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return arrayList.get(arrayList.size-1)
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}
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}else{
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return null
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}
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}
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fun remove(tag: String):Boolean{
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try {
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var index_value=arrayList.indexOf(tag)
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arrayList.removeAt(index_value)
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}catch (e:Exception){
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return false
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}
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return true
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}
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}

‎app/src/main/java/com/example/backstack_bottomnavigation/MainActivity.kt‎

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package com.example.backstack_bottomnavigation
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import androidx.appcompat.app.AppCompatActivity
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import android.os.Bundle
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import android.util.Log
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import android.view.MenuItem
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import androidx.fragment.app.Fragment
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import androidx.fragment.app.FragmentManager
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import com.example.backstack_bottomnavigation.fragments.HomeFragment
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import com.example.backstack_bottomnavigation.fragments.MidFragment
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import com.example.backstack_bottomnavigation.fragments.ProfileFragment
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import com.google.android.material.bottomnavigation.BottomNavigationView
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import java.util.*
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class MainActivity : AppCompatActivity() {
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private lateinit var bottomNavigation:BottomNavigationView
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private var currentTag:String="null"
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private var currentFragment:Fragment?=null
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private lateinit var homeFragment:Fragment
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private lateinit var midFragment:Fragment
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private lateinit var profileFragment:Fragment
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_main)
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//doWork()
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init(savedInstanceState)
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}
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fun doWork(){
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val array= arrayOf(2,3,2,3,5)
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val hashmap=HashMap<Int,Int>()
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for (i in 0.. array.size-1){
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if (hashmap.containsKey(array[i])){
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hashmap.put(array[i],(hashmap.get(array[i]) as Int)+1)
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}else{
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hashmap.put(array[i],1)
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}
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}
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publishResult(hashmap)
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}
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private fun publishResult(hashmap: HashMap<Int, Int>) {
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var iterator=hashmap.entries.iterator()
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while (iterator.hasNext()){
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var entry =iterator.next()
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Log.d("Aryan","${entry.key}--"+entry.value)
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}
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}
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private fun init(savedInstanceState: Bundle?) {
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bottomNavigation=findViewById(R.id.btm_nav)
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if (savedInstanceState==null){
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homeFragment= HomeFragment()
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midFragment= MidFragment()
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profileFragment= ProfileFragment()
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updateFragment(homeFragment,"home")
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}else{
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var stack=savedInstanceState.getStringArrayList("fragStack")
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FragmentStack.getInstance(3).addAll(stack);
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currentTag=savedInstanceState.getString("currentTag")!!
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currentFragment=supportFragmentManager.findFragmentByTag(currentTag)
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if (supportFragmentManager.findFragmentByTag("home")==null){
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homeFragment= HomeFragment()
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}else{
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homeFragment=supportFragmentManager.findFragmentByTag("home")!!
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}
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if (supportFragmentManager.findFragmentByTag("mid")==null){
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midFragment= MidFragment()
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}else{
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midFragment=supportFragmentManager.findFragmentByTag("mid")!!
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}
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if (supportFragmentManager.findFragmentByTag("profile")==null){
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profileFragment= ProfileFragment()
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}else{
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profileFragment= supportFragmentManager.findFragmentByTag("profile")!!
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}
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when(currentTag){
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"home"->{
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updateFragment(homeFragment,"home")
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bottomNavigation.selectedItemId=R.id.action_home
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}
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"mid"->{
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updateFragment(midFragment,"mid")
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bottomNavigation.selectedItemId=R.id.action_mid
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}
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"profile"->{
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updateFragment(profileFragment,"profile")
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bottomNavigation.selectedItemId=R.id.action_profile
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}
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}
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}
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bottomNavigation.setOnNavigationItemSelectedListener(object :BottomNavigationView.OnNavigationItemSelectedListener{
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override fun onNavigationItemSelected(item: MenuItem): Boolean {
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when(item.itemId){
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R.id.action_home->{
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updateFragment(homeFragment,"home")
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return true
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}
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R.id.action_mid->{
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updateFragment(midFragment,"mid")
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return true
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}
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R.id.action_profile->{
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updateFragment(profileFragment,"profile")
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return true
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}
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}
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return false
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}
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})
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}
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fun updateFragment(fragment:Fragment, tag:String){
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if (currentTag.equals(tag)){
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return
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}
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var prev_fragment=supportFragmentManager.findFragmentByTag(tag)
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// if fragment is not present in stack
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if (prev_fragment==null){
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if (currentFragment==null){
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supportFragmentManager.beginTransaction().add(R.id.frag_container,fragment,tag).commit()
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}else{
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supportFragmentManager.beginTransaction().hide(currentFragment!!).add(R.id.frag_container,fragment,tag).commit()
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}
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}
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// if fragment is already added
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else{
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supportFragmentManager.beginTransaction().hide(currentFragment!!).show(prev_fragment).commit()
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}
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FragmentStack.getInstance(3).push(tag)
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currentFragment=fragment
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currentTag=tag
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}
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override fun onBackPressed() {
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var currentFrag=supportFragmentManager.findFragmentByTag(currentTag)
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var childfragmanager: FragmentManager?=null
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if (currentFrag is ProfileFragment){
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childfragmanager=currentFrag.getchildFragmentManager()
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}else if (currentFrag is MidFragment){
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childfragmanager=currentFrag.getchildFragmentManager()
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}else if (currentFrag is HomeFragment){
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childfragmanager=currentFrag.getchildFragmentManager()
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}
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if (childfragmanager?.backStackEntryCount!!>0){
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childfragmanager.popBackStackImmediate()
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}
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else{
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var toptag = FragmentStack.getInstance(3).pop(currentTag)
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if (toptag!=null){
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var topfrag= supportFragmentManager.findFragmentByTag(toptag)
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supportFragmentManager.beginTransaction().hide(currentFragment!!).show(topfrag!!).commit()
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currentTag=toptag
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currentFragment=topfrag
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if (currentTag.equals("home")){
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bottomNavigation.selectedItemId=R.id.action_home
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}else if (currentTag.equals("mid")){
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bottomNavigation.selectedItemId=R.id.action_mid
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}else if (currentTag.equals("profile")){
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bottomNavigation.selectedItemId=R.id.action_profile
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}
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}else{
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if (currentTag.equals("home")){
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super.onBackPressed()
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}else{
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var newfrag= supportFragmentManager.findFragmentByTag("home")
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supportFragmentManager.beginTransaction().hide(currentFragment!!).show(newfrag!!).commit()
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currentTag="home"
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currentFragment=newfrag
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bottomNavigation.selectedItemId=R.id.action_home
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}
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}
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}
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}
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override fun onSaveInstanceState(outState: Bundle) {
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outState.putString("currentTag",currentTag)
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outState.putStringArrayList("fragStack",FragmentStack.getInstance(3).arrayList)
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super.onSaveInstanceState(outState)
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}
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}

‎app/src/main/java/com/example/backstack_bottomnavigation/fragments/HomeFragment.kt‎

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@@ -36,6 +36,7 @@ lateinit var about_me:TextView
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}
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private fun init() {
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var name = arguments?.getString("Name")?:let { "nothing" }
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Toast.makeText(context,name,Toast.LENGTH_LONG).show()
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about_me=mrootView.findViewById(R.id.about_me)

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