Develop Reference

I'm using Kotlin, I want to custom the default tablayout into the tab that i has been do but i dont know which part that i have to change

This is code of activity that has viewpager on it (ArtikelHome.kt):
package com.example.senangumrah
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.fragment.app.Fragment
import com.example.senangumrah.artikel.ArtikelViewPagerAdapter
import com.google.android.material.tabs.TabLayoutMediator
import kotlinx.android.synthetic.main.activity_artikel_home.*
import kotlinx.android.synthetic.main.activity_artikel_home.navigation_button
import kotlinx.android.synthetic.main.activity_artikel_home.tabLayout
import kotlinx.android.synthetic.main.activity_persediaan_home.*
import kotlinx.android.synthetic.main.cover_home_artikel.*
import kotlinx.android.synthetic.main.cover_home_menu.*
import kotlinx.android.synthetic.main.cover_home_persediaan.*
import kotlinx.android.synthetic.main.cover_home_persediaan.navigationView
import kotlinx.android.synthetic.main.layout_side_menu.*
class ArtikelHome : AppCompatActivity(), View.OnClickListener {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.cover_home_artikel)
onSetNavigationDrawerEvents()
val adapter = ArtikelViewPagerAdapter(supportFragmentManager, lifecycle)
viewPagerArtikel.adapter = adapter
TabLayoutMediator(tabLayout, viewPagerArtikel) { tab, position ->
when (position) {
0 -> {
tab.text = "Semua"
}
1 -> {
tab.text = "Kat 1"
}
2 -> {
tab.text = "Kat 2"
}
3 -> {
tab.text = "Kat 3"
}
4 -> {
tab.text = "Kat 4"
}
5 -> {
tab.text = "Kat 5"
}
}
}.attach()
val ButtonBack: ImageView = findViewById(R.id.back)
ButtonBack.setOnClickListener {
val intent = Intent(this, HomeMenu::class.java)
startActivity(intent)
}
}
}
This the code for activity_artikel_home.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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ArtikelHome">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/artikel_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.043"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.027"
app:srcCompat="#drawable/buttonback" />
<ImageView
android:id="#+id/navigation_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.956"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.027"
app:srcCompat="#drawable/menubutton" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/poppinsmedium"
android:text="Artikel"
android:textSize="18sp"
android:textColor="#1A1B23"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.037" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#android:color/darker_gray"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="parent"
app:layout_constraintStart_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.116" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#android:color/darker_gray"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="parent"
app:layout_constraintStart_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.182" />
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabLayout"
android:layout_width="377dp"
android:layout_height="wrap_content"
android:contentDescription="scrollabletab"
app:tabMinWidth="105dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.47"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.125"
app:tabMode="scrollable"
app:tabSelectedTextColor="#color/tabtext"
app:tabIndicatorColor="#color/tabtext"/>
<androidx.viewpager2.widget.ViewPager2
android:id="#+id/viewPagerArtikel"
android:layout_width="match_parent"
android:layout_height="600dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="parent"
app:layout_constraintStart_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
This the code of viewpageradapter for artikelhome (ArtikelViewPagerAdapter):
package com.example.senangumrah.artikel
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentManager
import androidx.lifecycle.Lifecycle
import androidx.viewpager2.adapter.FragmentStateAdapter
class ArtikelViewPagerAdapter (fragmentManager: FragmentManager, lifecycle: Lifecycle): FragmentStateAdapter(fragmentManager, lifecycle ) {
override fun getItemCount(): Int {
return 6
}
override fun createFragment(position: Int): Fragment {
return when (position) {
0->{
KategoriSemuaFragment()
}
1->{
Kategori1Fragment()
}
2->{
Kategori2Fragment()
}
3->{
Kategori3Fragment()
}
4->{
Kategori4Fragment()
}
5->{
Kategori5Fragment()
}
else->{
Fragment()
}
}
}
}
I have try using cardview but i cannot make the colour of tab change when select that tab. then i decide to use the default tablayout. The custom tablayout tht i want is when we select tha tab, the colour of the tab and the colour of text inside the tab change to another colour.
The design that i want to create is like this

This can be done by following steps:
Create a custom layout for your tab item.
Add a function on your ArtikelViewPagerAdapter class.
fun getTabView(position: Int): View {
val v: View = LayoutInflater.from(context).inflate(R.layout.custom_tab, null)
val tv = v.findViewById(R.id.textView) as TextView
tv.setText(tabTitles.get(position))
val img: ImageView = v.findViewById(R.id.imgView) as ImageView
img.setImageResource(imageResId.get(position))
return v
}
Call this function from your TabLayoutMediator this way.
tab.customView = mAdapter.getTabView(position)
Where mAdapter is your ArtikelViewPagerAdapter.

NullPointerException on RecyclerView setLayoutManager

I have faced the problem that my application will keep stopping when clicking search page fragments. I do not understand why this problem will happen? I directly used my other success code in another fragment but in this fragment suddenly appear this problem. Can somebody help me? Thank you for your help!!
My problem error :
java.lang.NullPointerException: Attempt to invoke virtual method
'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)'
on a null object reference at com.example.assignment_mad.Search_Page_Fragment.onViewCreated(Search_Page_Fragment.kt:153)
My main frgment ( Search_Page_Fragment ) :
package com.example.assignment_mad
import android.content.Intent
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.fragment_notification_.*
class Search_Page_Fragment : Fragment() {
private lateinit var newRecyclerView: RecyclerView
private lateinit var newArrayList: ArrayList<Company_Search>
private lateinit var tempArrayList: ArrayList<Company_Search>
lateinit var imageId:Array<Int>
lateinit var job_name:Array<String>
lateinit var saveicon:Array<Int>
lateinit var company_name:Array<String>
lateinit var place:Array<String>
lateinit var salary:Array<String>
lateinit var news:Array<String>
private var layoutManager: RecyclerView.LayoutManager? = null
private var adapter: RecyclerView.Adapter<Search_Page_Adapter.MyViewHolder>? = null
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
var views =inflater.inflate(R.layout.fragment_search__page_, container, false)
newRecyclerView=views.findViewById(R.id.recyclerView_Search)
// Inflate the layout for this fragment
return views
}
override fun onViewCreated(itemView: View, savedInstanceState: Bundle?) {
imageId= arrayOf(
R.drawable.company_logo_1,
R.drawable.company_logo_2,
R.drawable.company_logo_3,
R.drawable.company_logo_4,
R.drawable.company_logo_5,
R.drawable.company_logo_6,
R.drawable.company_logo_7,
R.drawable.company_logo_8,
R.drawable.company_logo_9,
R.drawable.company_logo_10
)
job_name= arrayOf(
"Engineer",
"Computer",
"Coder",
"Teacher",
"Engineer",
"Engineer",
"Engineer",
"Engineer",
"Engineer",
"Engineer"
)
saveicon= arrayOf(
R.drawable.ic_baseline_bookmark_added_24,
R.drawable.ic_baseline_bookmark_added_24,
R.drawable.ic_baseline_bookmark_added_24,
R.drawable.ic_baseline_bookmark_added_24,
R.drawable.ic_baseline_bookmark_added_24,
R.drawable.ic_baseline_bookmark_added_24,
R.drawable.ic_baseline_bookmark_added_24,
R.drawable.ic_baseline_bookmark_added_24,
R.drawable.ic_baseline_bookmark_added_24,
R.drawable.ic_baseline_bookmark_added_24
)
company_name= arrayOf(
"Phonix Sdn Bhd",
"Computer Sdn Bhd",
"Coder",
"Teacher",
"Engineer",
"Engineer",
"Engineer",
"Engineer",
"Engineer",
"Engineer"
)
place= arrayOf(
"Kuala Lumpur",
"Kuala Lumpur",
"Selangor",
"Rimbunan",
"Kuala Lumpur",
"Kuala Lumpur",
"Kuala Lumpur",
"Kuala Lumpur",
"Kuala Lumpur",
"Kuala Lumpur"
)
salary= arrayOf(
"RM3000",
"RM4000",
"RM3500",
"RM2000",
"RM1000",
"RM3000",
"RM3000",
"RM3000",
"RM3000",
"RM3000",
)
news= arrayOf(
getString(R.string.news_a),
getString(R.string.news_b),
getString(R.string.news_c),
getString(R.string.news_d),
getString(R.string.news_e),
getString(R.string.news_f),
getString(R.string.news_g),
getString(R.string.news_h),
getString(R.string.news_i),
getString(R.string.news_j)
)
newArrayList= arrayListOf<Company_Search>()
tempArrayList= arrayListOf<Company_Search>()
getUserdata()
super.onViewCreated(itemView, savedInstanceState)
newRecyclerView.apply {
layoutManager= LinearLayoutManager(activity)
newRecyclerView.setHasFixedSize(true)
}
recyclerView.apply {
// set a LinearLayoutManager to handle Android
// RecyclerView behavior
layoutManager= LinearLayoutManager(activity)
// set the custom adapter to the RecyclerView
adapter = Search_Page_Adapter(newArrayList)
}
}
private fun getUserdata() {
for (i in imageId.indices){
val companySearch=Company_Search(imageId[i],job_name[i],saveicon[i],company_name[i],place[i],salary[i])
newArrayList.add(companySearch)
}
// tempArrayList.addAll(newArrayList)
//
// val adapter = Notification_Fragment(tempArrayList)
var adapter=Search_Page_Adapter(newArrayList)
newRecyclerView.adapter=adapter
adapter.setOnItemClickListener(object :Search_Page_Adapter.onItemClickListener{
override fun onItemClick(position: Int) {
Toast.makeText(context,"You clicked in item no . $position",Toast.LENGTH_SHORT).show()
val intent= Intent(context,Search_Page_Detail::class.java)
intent.putExtra("name",newArrayList[position].job_name)
intent.putExtra("imageId",newArrayList[position].titleImage)
intent.putExtra("news",news[position])
startActivity(intent)
}
})
}
}
The page adapter :
package com.example.assignment_mad
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.imageview.ShapeableImageView
class Search_Page_Adapter(private val companysList:ArrayList<Company_Search>):RecyclerView.Adapter<Search_Page_Adapter.MyViewHolder>() {
private var mListener:onItemClickListener?=null
interface onItemClickListener{
fun onItemClick(position: Int)
}
fun setOnItemClickListener(listener: onItemClickListener){
mListener=listener
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
val itemView=LayoutInflater.from(parent.context).inflate(R.layout.list_item_search,parent,false)
return MyViewHolder(itemView,mListener)
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
val currentItem=companysList[position]
holder.titleImage.setImageResource(currentItem.titleImage)
holder.job_name.text=currentItem.job_name
holder.save_icon.setImageResource(currentItem.save_icon)
holder.company_name.text=currentItem.company_name
holder.place.text=currentItem.place
holder.salary.text=currentItem.salary
}
override fun getItemCount(): Int {
return companysList.size
}
//to insert the post detail
class MyViewHolder(itemView: View,listener: onItemClickListener?):RecyclerView.ViewHolder(itemView){
val titleImage:ShapeableImageView=itemView.findViewById(R.id.title_image2)
val job_name:TextView=itemView.findViewById(R.id.job_name)
val save_icon:ShapeableImageView=itemView.findViewById(R.id.save_icon)
val company_name:TextView=itemView.findViewById(R.id.company_name)
val place:TextView=itemView.findViewById(R.id.detail_place)
val salary:TextView=itemView.findViewById(R.id.detail_salary)
init {
itemView.setOnClickListener{
listener?.onItemClick(adapterPosition)
}
}
}
}
The xml file for Search_Page_Fragment :
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
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:background="#color/white"
tools:context=".Search_Page_Fragment">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="#+id/search_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Search Job"
android:inputType="text"
android:minHeight="48dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<TextView
android:id="#+id/place_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/black"
android:text="Area, City or Town"
android:textSize="16sp"
android:layout_marginStart="16dp"
android:layout_marginEnd="32dp"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="#+id/search_bar"
app:layout_constraintStart_toStartOf="parent"/>
<Spinner
android:id="#+id/spinner_job"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:minWidth="200dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/place_name" />
<TextView
android:id="#+id/job_specialize"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/black"
android:text="Job Specialize"
android:textSize="16sp"
android:layout_marginStart="16dp"
android:layout_marginEnd="32dp"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="#+id/search_bar"
app:layout_constraintEnd_toEndOf="parent" />
<Spinner
android:id="#+id/spinner_place"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:minWidth="200dp"
app:layout_constraintTop_toBottomOf="#+id/job_specialize"
app:layout_constraintEnd_toEndOf="parent"
/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView_Search"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="108dp"
app:layout_constraintTop_toBottomOf="#+id/spinner_job"
tools:layout_editor_absoluteX="-16dp"
tools:listitem="#layout/list_item_search" />
</androidx.constraintlayout.widget.ConstraintLayout>
</FrameLayout>
The list_item_search_xml :
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_margin="8dp">
<com.google.android.material.imageview.ShapeableImageView
android:layout_width="80dp"
android:layout_height="80dp"
android:id="#+id/title_image2"
android:scaleType="centerCrop"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:shapeAppearanceOverlay="#style/RoundCorner"
android:src="#drawable/company_logo_1"/>
<TextView
android:id="#+id/job_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textColor="#color/blue"
android:text="Gradute Engineer"
android:textSize="20sp"
android:textStyle="bold"
android:layout_marginStart="16dp"
android:layout_marginEnd="32dp"
android:layout_marginTop="8dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/title_image2"/>
<ImageView
android:layout_width="40dp"
android:layout_height="40dp"
android:id="#+id/save_icon"
android:scaleType="centerCrop"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#+id/title_image2"
android:layout_marginEnd="32dp"
app:shapeAppearanceOverlay="#style/RoundCorner"
android:src="#drawable/ic_baseline_bookmark_added_24"/>
<TextView
android:id="#+id/company_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textColor="#color/black"
android:text="Neric Compat"
android:textSize="18sp"
android:layout_marginStart="16dp"
android:layout_marginEnd="32dp"
android:layout_marginTop="8dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/job_name"/>
<TextView
android:id="#+id/detail_place"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textColor="#color/black"
android:text="Petaling Jaya"
android:textSize="16sp"
android:textStyle="bold"
android:layout_marginStart="16dp"
android:layout_marginEnd="32dp"
android:layout_marginTop="8dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/company_name"/>
<TextView
android:id="#+id/detail_salary"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textColor="#color/black"
android:text="MYR 3,700 - 4,300 /Month"
android:textSize="16sp"
android:layout_marginStart="16dp"
android:layout_marginEnd="32dp"
android:layout_marginTop="8dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/detail_place"/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_margin="8dp"
style="bold"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/detail_salary"
android:background="#color/underline"/>
</androidx.constraintlayout.widget.ConstraintLayout>

Your NullPointerException indicates that when this line of code is reached...
layoutManager= LinearLayoutManager(activity)
...that your newRecyclerView is null. Are you sure that you have the right resource ID here when you attempt to set it?
newRecyclerView=views.findViewById(R.id.recyclerView_Search)
Try using the debugger and set a breakpoint on these two lines to confirm is newRecyclerView is indeed null.

You must assign the RecyclerView a LayoutManager. Since you have both of them, place this line as the last statement of recyclerView.apply { … } block(s):
setLayoutManager(layoutManager)
// ↑↑↑↑↑↑↑↑↑↑↑↑↑
// Your LayoutManager

RecyclerView showing only 1st item, when tying to set dynamic height

I'm trying to set the dynamic height for my recycler view, because I have the Add button below it, that adds a new item to the list.
I'm using Constraint Layout in my parent fragment. I followed this advice, and when I add first item, it shows up and the ADD button slides down as expected, but the problem is that when I add the second one it just doesn't appear.
Here is the layout of my parent fragment:
<?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:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".SecondFragment">
<Button
android:id="#+id/cancel_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="444dp"
android:text="#string/cancel"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/cancel_button2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/addItemActionButton" />
<Button
android:id="#+id/cancel_button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="76dp"
android:text="#string/ok"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toRightOf="#id/cancel_button"
app:layout_constraintTop_toBottomOf="#+id/addItemActionButton"
app:layout_constraintVertical_bias="1.0" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="372dp"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
app:layout_constrainedHeight="true"
app:layout_constraintBottom_toTopOf="#id/addItemActionButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.41"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.065" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/addItemActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="492dp"
android:clickable="true"
android:src="#android:drawable/ic_input_add"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/recyclerView"
tools:ignore="SpeakableTextPresentCheck" />
</androidx.constraintlayout.widget.ConstraintLayout>
And here's the one for the recycler item layout:
<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:padding="8dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constrainedHeight="true">
<com.google.android.material.textfield.TextInputLayout
android:id="#+id/textInputLayout"
android:layout_width="288dp"
android:layout_height="51dp"
android:layout_marginBottom="5dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.495"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.024">
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/item"
android:layout_width="300dp"
android:layout_height="71dp"
android:hint="#string/item" />
</com.google.android.material.textfield.TextInputLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
Here's my fragment code:
package com.example.progresstracker
import android.os.Bundle
import android.util.Log
import android.util.Log.INFO
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.navigation.fragment.findNavController
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.progresstracker.databinding.FragmentSecondBinding
/**
* A simple [Fragment] subclass as the second destination in the navigation.
*/
class SecondFragment : Fragment() {
private var layoutManager: RecyclerView.LayoutManager? = null
private var adapter: RecyclerView.Adapter<RecyclerAdapter.ViewHolder>? = null
private var _binding: FragmentSecondBinding? = null
private var items: ArrayList<String> = ArrayList()
// This property is only valid between onCreateView and
// onDestroyView.
private val binding get() = _binding!!
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
_binding = FragmentSecondBinding.inflate(inflater, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding.recyclerView.apply {
// set a LinearLayoutManager to handle Android
// RecyclerView behavior
layoutManager = LinearLayoutManager(activity, RecyclerView.VERTICAL, false)
// set the custom adapter to the RecyclerView
adapter = RecyclerAdapter(items)
}
// linearLayoutManager = LinearLayoutManager(context)
// binding.recyclerView.layoutManager = linearLayoutManager
binding.cancelButton.setOnClickListener {
findNavController().navigate(R.id.action_SecondFragment_to_FirstFragment)
}
binding.addItemActionButton.setOnClickListener {
items.add("Testing..")
adapter = RecyclerAdapter(items)
adapter?.notifyItemInserted(items.size - 1)
binding.recyclerView.adapter = adapter
}
}
override fun onDestroyView() {
super.onDestroyView()
_binding = null
}
}
And the adapter:
package com.example.progresstracker
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
class RecyclerAdapter(private val items: ArrayList<String>) : RecyclerView.Adapter<RecyclerAdapter.ViewHolder>() {
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
var item: TextView
init {
item = itemView.findViewById(R.id.item)
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val v = LayoutInflater.from(parent.context).inflate(R.layout.recyclerview_item_row, parent, false)
return ViewHolder(v)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.item.text = items[position]
}
override fun getItemCount(): Int {
return items.size
}
}

RecyclerView OnClickListener not firing

I aim to make a simple to-do list and for that I have used RecyclerView. My issue is that the OnClickListener() in the RecyclerView adapter class is not getting called. I have no idea why this is happening.
P.S I am fairly new to Android Development so please excuse any stupid mistake I have made.
RecyclerView adapter class:
import android.content.Intent
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import android.widget.Toast
import androidx.core.content.ContextCompat.startActivity
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.card.MaterialCardView
import kotlinx.android.synthetic.main.activity_task.*
import kotlinx.android.synthetic.main.item_todo.view.*
import java.text.SimpleDateFormat
import java.util.*
class TodoAdapter(val list: List<TodoModel>) : RecyclerView.Adapter<TodoAdapter.TodoViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TodoViewHolder {
return TodoViewHolder(
LayoutInflater.from(parent.context)
.inflate(R.layout.item_todo, parent, false)
)
}
override fun getItemCount() = list.size
override fun onBindViewHolder(holder: TodoViewHolder, position: Int) {
holder.bind(list[position],position)
holder.itemView.setOnClickListener {
Log.e("dbg","click")
Toast.makeText(holder.itemView.context,"This should be called",Toast.LENGTH_SHORT).show()
}
}
override fun getItemId(position: Int): Long {
return list[position].id
}
class TodoViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bind(todoModel: TodoModel,pos:Int) {
with(itemView) {
txtShowTitle.text = todoModel.title
txtShowTask.text = todoModel.description
txtShowCategory.text = todoModel.category
updateTime(todoModel.time)
updateDate(todoModel.date)
}
}
private fun updateTime(time: Long) {
//4:55 AM
val myformat = "h:mm a"
val sdf = SimpleDateFormat(myformat)
itemView.txtShowTime.text = sdf.format(Date(time))
}
private fun updateDate(time: Long) {
//Mon, 5 Jan 2020
val myformat = "EEE, d MMM yyyy"
val sdf = SimpleDateFormat(myformat)
itemView.txtShowDate.text = sdf.format(Date(time))
}
}
}
item xml:
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.card.MaterialCardView 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="wrap_content"
android:padding="10dp"
android:id="#+id/item"
app:cardBackgroundColor="#818181"
xmlns:tools="http://schemas.android.com/tools"
android:layout_marginBottom="10dp"
android:elevation="10dp"
app:cardCornerRadius="10dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="5dp"
android:background="?android:attr/selectableItemBackground"
android:clickable="true"
android:padding="10dp"
android:theme="#style/allDetailsTextColor">
<TextView
android:id="#+id/txtShowTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_marginEnd="5dp"
android:layout_toStartOf="#+id/txtShowCategory"
android:ellipsize="end"
android:maxLines="1"
android:textSize="20sp"
android:textStyle="bold"
tools:text="Task Title" />
<TextView
android:id="#+id/txtShowTask"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/txtShowTitle"
android:layout_alignParentStart="true"
android:layout_marginTop="4dp"
android:textSize="16sp"
tools:text="Task Subtitle" />
<TextView
android:id="#+id/txtShowCategory"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:background="#drawable/spinner_item_background"
android:padding="4dp"
android:ellipsize="end"
android:maxWidth="80dp"
android:maxLines="1"
android:textSize="12sp"
tools:text="Category" />
<TextView
android:id="#+id/txtShowDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/txtShowTask"
android:layout_marginTop="30dp"
android:layout_toLeftOf="#+id/txtShowTime"
android:layout_marginRight="10dp"
android:visibility="visible"
tools:text="22-12-2017" />
<TextView
android:id="#+id/txtShowTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/txtShowTask"
android:layout_alignParentEnd="true"
android:layout_marginTop="30dp"
android:fontFamily="#font/montserrat"
android:visibility="visible"
tools:text="22:12 AM" />
</RelativeLayout>
</com.google.android.material.card.MaterialCardView>
Any help would be appreciated.

LinearLayout Add multiple items

I faced a strange problem : I can't add more than one object dynamically on a LinearLayout , if they were already things , that works, So That can display multiple views
I tried with different views , there is only problems when i try to push one after the other
(there is two buttons in index 0 and 1 to test for multiple objects on the layout)
CODE :
val view = layoutInflater.inflate(R.layout.sensor_item, container, false)
val view2 = layoutInflater.inflate(R.layout.nosensor_item, container, false)
val insertPoint = viewOfLayout.findViewById(R.id.box_Parent) as LinearLayout
insertPoint.addView(view, 2)
//insertPoint.addView(view2, 3) //works
This Works too :
//insertPoint.addView(view, 3)
insertPoint.addView(view2, 2) //works
This doesn't works :
insertPoint.addView(view, 2)
insertPoint.addView(view2, 3) //doesn't works
Full Code (fragments.kt):
package com.corrupted.radheat.TEMPER
import android.os.Bundle
import android.support.v4.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.*
import kotlinx.android.synthetic.main.sensor_item.view.*
class EditFragment : Fragment() {
lateinit var option : Spinner
lateinit var result : TextView
private lateinit var viewOfLayout: View
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
viewOfLayout = inflater.inflate(R.layout.edit_fragment, container, false)
//create a view to inflate the layout_item (the xml with the textView created before)
val view = layoutInflater.inflate(R.layout.sensor_item, container, false)
val view2 = layoutInflater.inflate(R.layout.nosensor_item, container, false)
val insertPoint = viewOfLayout.findViewById(R.id.box_Parent) as LinearLayout
insertPoint.addView(view, 2)
insertPoint.addView(view2, 3)
option = view.spinner as Spinner
result = view.textView7 as TextView
val options = arrayOf("A","V")
option.adapter = ArrayAdapter<String>(activity,android.R.layout.simple_list_item_1,options)
option.onItemSelectedListener = object : AdapterView.OnItemSelectedListener{
override fun onNothingSelected(parent: AdapterView<*>?) {
result.text = "0"
}
override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
result.text = options[position]
}
}
return viewOfLayout
}
class InfoFragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.info_fragment, container, false)
}
}
class ParamsFragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.parameters_fragment, container, false)
}
}
Code of the fragment :
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
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/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
android:id="#+id/box_Parent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<Button
android:id="#+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
Code of the added view :
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:fillViewport="true"
android:id="#+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent">
<android.support.constraint.ConstraintLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="12dp"
android:background="#color/background_Item_light"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="#+id/textView9"
android:layout_width="wrap_content"
android:layout_height="24dp"
android:text=".0 C°"
android:textColor="#color/Text_Color_Light"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="#+id/textView8"
app:layout_constraintStart_toEndOf="#+id/textView8"
app:layout_constraintTop_toTopOf="#+id/textView8"
app:layout_constraintVertical_bias="0.625" />
<TextView
android:id="#+id/textView7"
android:layout_width="wrap_content"
android:layout_height="24dp"
android:layout_marginStart="4dp"
android:text=".0 C°"
android:textColor="#color/Text_Color_Light"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="#+id/textView5"
app:layout_constraintStart_toEndOf="#+id/textView5"
app:layout_constraintTop_toTopOf="#+id/textView5"
app:layout_constraintVertical_bias="0.79" />
<TextView
android:id="#+id/textView8"
android:layout_width="wrap_content"
android:layout_height="56dp"
android:layout_marginStart="10dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:text="00"
android:textColor="#color/Text_Color_Light"
android:textSize="36sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="#+id/imageButton"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.937" />
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="4dp"
android:layout_marginTop="4dp"
android:text="#string/ROOMtext"
android:textColor="#color/Text_Color_Light"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Spinner
android:id="#+id/spinner"
android:layout_width="45dp"
android:layout_height="43dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="24dp"
android:layout_marginBottom="8dp"
android:background="#color/UI_ITEM_OVERLAP_LIGHT"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="#+id/imageButton"
android:layout_width="40dp"
android:layout_height="36dp"
android:layout_marginStart="8dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.4"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_keyboard_arrow_up_black_24dp" />
<ImageButton
android:id="#+id/imageButton3"
android:layout_width="40dp"
android:layout_height="36dp"
android:layout_marginStart="8dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="6dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.4"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageButton"
app:srcCompat="#drawable/ic_keyboard_arrow_down_black_24dp" />
<TextView
android:id="#+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:text="00"
android:textColor="#color/Text_Color_Light"
android:textSize="36sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.652" />
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
MainActivity.kt :
package com.corrupted.radheat.TEMPER
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.design.widget.BottomNavigationView
import android.support.v4.app.Fragment
import android.widget.*
class MainActivity : AppCompatActivity() {
private val fragmentManager = supportFragmentManager
private val fragmentTransaction = fragmentManager.beginTransaction()
private val editfragment = EditFragment()
private val infofragment = InfoFragment()
private val parametersfragment = ParamsFragment()
private fun showFragment(fragment: Fragment) {
val fragmentManager = supportFragmentManager
fragmentManager.beginTransaction()
.replace(R.id.fragment_container, fragment)
.commit()
}
private val mOnNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
when (item.itemId) {
R.id.action_edit -> {
showFragment(editfragment)
return#OnNavigationItemSelectedListener true
}
R.id.action_info-> {
showFragment(infofragment)
return#OnNavigationItemSelectedListener true
}
R.id.action_Settings-> {
showFragment(parametersfragment)
return#OnNavigationItemSelectedListener true
}
}
false
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
fragmentTransaction.add(R.id.fragment_container, infofragment)
fragmentTransaction.commit()
setContentView(R.layout.activity_main)
val navigation = findViewById<BottomNavigationView>(R.id.activity_main_bottom_navigation)
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)
// Create a GLSurfaceView instance and set it
// as the ContentView for this Activity.
}
}
Pic of it working : https://imgur.com/gallery/mLb4G5b
Thanks