All RecyclerView items are not visible when using RecyclerView in ConstraintLayout - android

I am using ConstraintLayout as a parent and put recyclerview in it to populate the list. Suppose I have to give item count 5 to populate the list and run the code then the list is showing perfectly but the last item of the recyclerview is showing half and not fully visible, and scroll stops at there. I found a solution for this is if am giving height match_parent to the recyclerview then it works fine but then all other view is hidden behind the recyclerview.
If I use another parent view like LinearLayout or RelativeLayout, then recyclerview with height wrap_content works fine and all the list item are fully visible.
I have tried by 2 ways that work for me but I found that wrong programming practice
I give height match_parent to recyclerview and give top_margin to the recylerview so all the other UI item show.
I give padding_bottom to the recyclerview until all the list item position visible
My XML file "activity_per_day_sale.xml" is below.
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/black">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:popupTheme="#style/AppTheme.PopupOverlay">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical">
<ImageView
android:layout_width="40dp"
android:layout_height="40dp"
android:id="#+id/btn_back"
android:padding="5dp"
android:onClick="OnClickPerDaySale"
android:background="?attr/selectableItemBackground"
android:src="#drawable/icon_back_white"
/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Signup"
android:layout_centerInParent="true"
android:id="#+id/home_title_text"
android:textColor="#color/black"
android:visibility="gone"
android:fontFamily="#font/seguisb"
android:textSize="18sp"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="SKIP"
android:padding="10dp"
android:layout_centerVertical="true"
android:visibility="gone"
android:id="#+id/skip"
android:textColor="#color/black"
android:fontFamily="#font/seguisb"
android:textSize="18sp"/>
</RelativeLayout>
</android.support.v7.widget.Toolbar>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25sp"
android:layout_marginTop="10dp"
android:text="Per Day Sale Details"
android:textColor="#color/yellow_app_logo_color"
android:fontFamily="#font/segoeuib"
app:layout_constraintTop_toBottomOf="#+id/toolbar"
app:layout_constraintStart_toStartOf="parent"
android:id="#+id/TV_signupScreenText"
android:layout_marginLeft="45dp"/>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/rv_perday_sale"
android:layout_marginTop="10dp"
android:layout_marginHorizontal="10dp"
app:layout_constraintTop_toBottomOf="#+id/TV_signupScreenText"/>
</android.support.constraint.ConstraintLayout>
Activity class is "PerDaySaleActivity.kt"
import android.content.Context
import android.content.Intent
import android.os.Bundle
import android.support.v7.widget.StaggeredGridLayoutManager
import android.view.View
import com.nq.NQManager.R
import com.nq.NQManager.utils.BaseActivity
import kotlinx.android.synthetic.main.activity_per_day_sale.*
class PerDaySaleActivity:BaseActivity(){
var adapterPerdaySale : AdapterPerdaySale? = null
companion object {
fun start(context: Context) {
val starter = Intent(context, PerDaySaleActivity::class.java)
context.startActivity(starter)
}
}
override fun getID(): Int {
return R.layout.activity_per_day_sale
}
override fun iniView(savedInstanceState: Bundle?) {
initViews()
}
fun OnClickPerDaySale(v: View){
when(v){
btn_back->{
finish()
}
}
}
fun initViews() {
adapterPerdaySale = AdapterPerdaySale( this)
rv_perday_sale.layoutManager = StaggeredGridLayoutManager(1, 1)
rv_perday_sale.adapter = adapterPerdaySale
}
private fun setUpRecyclerView() {
runOnUiThread { adapterPerdaySale!!.notifyDataSetChanged() }
}
My Adapter class "AdapterPerdaySale.kt"
mport android.content.Context
import android.support.v7.widget.RecyclerView
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import com.nq.NQManager.R
import kotlinx.android.synthetic.main.adapter_perday_sale.view.*
class AdapterPerdaySale(context: Context):
RecyclerView.Adapter<AdapterPerdaySale.MyViewHOlder>() {
private var ctx:Context?=context
override fun onCreateViewHolder(p0: ViewGroup, p1: Int): MyViewHOlder {
return MyViewHOlder(LayoutInflater.from(ctx).inflate(R.layout.adapter_perday_sale, p0, false))
}
override fun getItemCount(): Int {
return 5
}
override fun onBindViewHolder(holder: MyViewHOlder, position: Int) {
if (position==1){
holder.tv_date.text="26 June, 2019"
}else if(position==2){
holder.tv_date.text="27 June, 2019"
}
}
inner class MyViewHOlder(view: View) : RecyclerView.ViewHolder(view) {
val tv_date=view.tv_date
}
}
My Adapter xml file "adapter_perday_sale.xml"
<?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" android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingVertical="5dp"
android:background="#color/black">
<TextView
android:id="#+id/tv_date"
android:layout_below="#+id/txt_today"
android:layout_centerHorizontal="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/white"
android:fontFamily="#font/segoeuib"
android:text="25 June, 2019"
android:textSize="23sp"
android:layout_marginEnd="8dp" app:layout_constraintEnd_toEndOf="parent"
android:layout_marginRight="8dp" android:layout_marginStart="8dp"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginLeft="8dp" android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/linearLayout1"
android:orientation="horizontal"
app:layout_constraintTop_toBottomOf="#+id/tv_date">
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:layout_gravity="center"
android:gravity="center"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25sp"
android:layout_marginTop="5dp"
android:text="Orders"
android:layout_centerHorizontal="true"
android:textColor="#color/white"
android:fontFamily="#font/segoeuib"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="50sp"
android:layout_marginTop="0dp"
android:text="50"
android:layout_centerHorizontal="true"
android:textColor="#color/order_history_txt_color"
android:fontFamily="#font/segoeui"/>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:gravity="center"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25sp"
android:layout_marginTop="5dp"
android:text="Revenue"
android:layout_centerHorizontal="true"
android:textColor="#color/white"
android:fontFamily="#font/segoeuib"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="50sp"
android:layout_marginTop="0dp"
android:text="£550"
android:layout_centerHorizontal="true"
android:textColor="#color/order_history_txt_color"
android:fontFamily="#font/segoeui"/>
</LinearLayout>
</LinearLayout>
<View android:layout_width="match_parent"
android:layout_height="1.5dp"
android:background="#color/gray"
android:id="#+id/view_1"
app:layout_constraintTop_toBottomOf="#+id/linearLayout1"
android:layout_marginLeft="8dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="8dp"/>
</android.support.constraint.ConstraintLayout>


Add this app:layout_constraintBottom_toBottomOf="parent" property to your recyclerview
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:popupTheme="#style/AppTheme.PopupOverlay">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical">
<ImageView
android:id="#+id/btn_back"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="?attr/selectableItemBackground"
android:onClick="OnClickPerDaySale"
android:padding="5dp"
android:src="#drawable/ic_background" />
<TextView
android:id="#+id/home_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Signup"
android:textColor="#000"
android:textSize="18sp"
android:visibility="gone" />
<TextView
android:id="#+id/skip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:padding="10dp"
android:text="SKIP"
android:textColor="#000"
android:textSize="18sp"
android:visibility="gone" />
</RelativeLayout>
</androidx.appcompat.widget.Toolbar>
<TextView
android:id="#+id/TV_signupScreenText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="45dp"
android:layout_marginTop="10dp"
android:text="Per Day Sale Details"
android:textColor="#AD4E4E"
android:textSize="25sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_perday_sale"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#+id/TV_signupScreenText" />
</androidx.constraintlayout.widget.ConstraintLayout>

Related

Unable to communicate with an element of my view with a layout, Kotlin

I am hoping that someone could please help me. I am creating an application using Kotlin. Mostly so far, so good, but I am having issues with one area.
The issue is with that 'distance.amountPicker.value' does not seem to be communicating with the layout. All of the other areas are working just fine i.e hikeName.text.toString(), etc, but I cannot get amountPicker to work.
I am not sure if the issue is with the import 'import kotlinx.android.synthetic.main.activity_hike.view.', as these seems to be a different import than the rest, which use 'import kotlinx.android.synthetic.main.activity_hike.'
If anyone could please guide me in the right direction, I'd really appreciate it.
Many thanks
Here is my code:
View:
package org.wit.hikingtrails.views.hike
import android.content.Intent
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import kotlinx.android.synthetic.main.activity_hike.*
import kotlinx.android.synthetic.main.activity_hike.view.*
import org.wit.hikingtrails.R
import org.wit.hikingtrails.models.HikeModel
import org.wit.hikingtrails.views.BaseView
import readImageFromPath
class HikeView : BaseView()
{
lateinit var presenter: HikePresenter
var hike = HikeModel()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_hike)
progressBar.max = 1000
amountPicker.minValue = 1
amountPicker.maxValue = 1000
init(toolbarAdd)
presenter = initPresenter (HikePresenter(this)) as HikePresenter
btnAdd.setOnClickListener{
presenter.doAddOrSave(
hikeName.text.toString(),
description.text.toString(),
if(difficultyLevel.checkedRadioButtonId == R.id.Intermediate)
"Intermediate" else "Hard",
**distance.amountPicker.value**
) }
btnDelete.setOnClickListener { presenter.doAddOrSave(hikeName.text.toString(), description.text.toString(), difficulty.text.toString(), distance.text.length) }
chooseImage.setOnClickListener { presenter.doSelectImage() }
hikeLocation.setOnClickListener { presenter.doSetLocation() }
btnDelete.setOnClickListener { presenter.doDelete() }
}
override fun showHike(hike: HikeModel) {
hikeName.setText(hike.name)
description.setText(hike.description)
distance.setText("Distance - "+hike.distance+"km")
difficulty.setText("Difficulty Level - "+hike.difficultyLevel)
hikeImage.setImageBitmap(readImageFromPath(this, hike.image.toString()))
if (hike.image != null) {
chooseImage.setText(R.string.change_hike_image)
}
btnAdd.setText(R.string.save_hike)
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.menu_hike, menu)
return super.onCreateOptionsMenu(menu)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item?.itemId) {
if (hikeName.text.toString().isEmpty()) {
R.id.item_cancel -> {
presenter.doCancel()
}
}
return super.onOptionsItemSelected(item)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (data != null) {
presenter.doActivityResult(requestCode, resultCode, data)
}
}
override fun onBackPressed() {
presenter.doCancel()
}
}
Layout
<?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="match_parent"
tools:context="org.wit.hikingtrails.views.hike.HikeView">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorAccent"
android:fitsSystemWindows="true"
app:elevation="0dip"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbarAdd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:titleTextColor="#color/colorPrimary" />
</com.google.android.material.appbar.AppBarLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/appBarLayout"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<EditText
android:id="#+id/hikeName"
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_margin="8dp"
android:autofillHints=""
android:hint="#string/hint_hikeName"
android:inputType="text"
android:maxLength="25"
android:maxLines="1"
android:padding="8dp"
android:textColor="#color/colorPrimaryDark"
android:textSize="14sp" />
<EditText
android:id="#+id/description"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:hint="#string/hint_hikeDescription"
android:inputType="text"
android:maxLength="25"
android:maxLines="1"
android:padding="8dp"
android:textColor="#color/colorPrimaryDark"
android:textSize="14sp" />
<Button
android:id="#+id/chooseImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:background="#color/colorAccent"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:text="#string/button_addImage"
android:textColor="#color/colorPrimary"
android:textSize="16sp" />
<ImageView
android:id="#+id/hikeImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:srcCompat="#mipmap/ic_launcher" />
<Button
android:id="#+id/hikeLocation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:background="#color/colorAccent"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:stateListAnimator="#null"
android:text="#string/button_location"
android:textColor="#color/colorPrimary"
android:textSize="16sp" />
<TextView
android:id="#+id/hikeSubtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/donateTitle"
android:layout_alignEnd="#+id/donateTitle"
android:layout_alignParentStart="true"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="#string/hikeSubtitle"
android:textAppearance="?android:attr/textAppearanceMedium" />
<RadioGroup
android:id="#+id/difficultyLevel"
android:layout_width="328dp"
android:layout_height="wrap_content"
android:layout_above="#+id/progressBar"
android:layout_alignParentStart="true"
android:orientation="horizontal">
<RadioButton
android:id="#+id/Hard"
android:layout_width="138dp"
android:layout_height="wrap_content"
android:checked="true"
android:text="#string/hard" />
<RadioButton
android:id="#+id/Intermediate"
android:layout_width="168dp"
android:layout_height="wrap_content"
android:checked="false"
android:text="#string/intermediate" />
</RadioGroup>
<NumberPicker
android:id="#+id/amountPicker"
android:layout_width="wrap_content"
android:layout_height="121dp"
android:layout_alignEnd="#+id/donateSubtitle"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp" />
<ProgressBar
android:id="#+id/progressBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="349dp"
android:layout_height="14dp"
android:layout_above="#+id/donateButton"
android:layout_alignEnd="#+id/donateSubtitle"
android:layout_alignParentStart="true"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:indeterminate="false"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.526"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.7" />
<TextView
android:id="#+id/distance"
android:layout_width="267dp"
android:layout_height="38dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="#string/distance" />
<TextView
android:id="#+id/difficulty"
android:layout_width="265dp"
android:layout_height="38dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="#string/difficulty" />
<Button
android:id="#+id/btnAdd"
android:layout_width="375dp"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:background="#color/colorAccent"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:stateListAnimator="#null"
android:text="#string/button_addHike"
android:textColor="#color/colorPrimary"
android:textSize="16sp" />
<Button
android:id="#+id/btnDelete"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:background="#color/red"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:stateListAnimator="#null"
android:text="#string/button_deleteHike"
android:textColor="#color/colorPrimary"
android:textSize="16sp" />
</LinearLayout>
</ScrollView>
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

Unresolved reference to constraintLayout variable in Kotlin code in android app

I am following this tutorial to create an android app with space animation stuff. In the step titled "Transition Manager" you're instructed to add the following code to your MainActivity.kt file:
`
constraintSet1.clone(constraintLayout) //1
constraintSet2.clone(this, R.layout.activity_main) //2
departButton.setOnClickListener { //3
//apply the transition
TransitionManager.beginDelayedTransition(constraintLayout) //4
val constraint = if (!isOffscreen) constraintSet1 else constraintSet2
isOffscreen = !isOffscreen
constraint.applyTo(constraintLayout) //5
}
`
When this code is added the variable "constraintLayout" throws up an unresolved reference error
I think constraintLayout is supposed to be pointing to something in the xml and something is failing to make that happen, I just don't know what.
The kotlin code after adding the above block is:
`
package com.raywenderlich.android.razegalactic
import android.os.Bundle
import android.support.constraint.*
import android.support.v7.app.AppCompatActivity
import android.transition.TransitionManager
import kotlinx.android.synthetic.main.keyframe1.*
/**
* Main Screen
*/
class MainActivity : AppCompatActivity() {
private val constraintSet1 = ConstraintSet()
private val constraintSet2 = ConstraintSet()
private var isOffscreen = true
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.keyframe1)
switch1.setOnCheckedChangeListener { _, isChecked ->
switch1.setText(if (isChecked) R.string.round_trip else R.string.one_way)
constraintSet1.clone(constraintLayout) //1
constraintSet2.clone(this, R.layout.activity_main) //2
departButton.setOnClickListener { //3
//apply the transition
TransitionManager.beginDelayedTransition(constraintLayout) //4
val constraint = if (!isOffscreen) constraintSet1 else constraintSet2
isOffscreen = !isOffscreen
constraint.applyTo(constraintLayout) //5
}
}
}
}
`
The main xml is as follows:
`
<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:id="#+id/ConstraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
tools:context=".MainActivity">
<ImageView
android:id="#+id/flightsIcon"
android:layout_width="30dp"
android:layout_height="30dp"
android:src="#drawable/rocket_icon"
app:layout_constraintBottom_toBottomOf="#+id/spaceStationIcon"
app:layout_constraintEnd_toStartOf="#+id/roverIcon"
app:layout_constraintStart_toEndOf="#+id/spaceStationIcon"
app:layout_constraintTop_toTopOf="#+id/spaceStationIcon" />
<ImageView
android:id="#+id/spaceStationIcon"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_marginTop="15dp"
android:src="#drawable/space_station_icon"
app:layout_constraintEnd_toStartOf="#+id/flightsIcon"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/roverIcon"
android:layout_width="30dp"
android:layout_height="30dp"
android:src="#drawable/rover_icon"
app:layout_constraintBottom_toBottomOf="#+id/flightsIcon"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/flightsIcon"
app:layout_constraintTop_toTopOf="#+id/flightsIcon" />
<TextView
android:id="#+id/spaceStationLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="#string/space_stations"
app:layout_constraintEnd_toEndOf="#+id/spaceStationIcon"
app:layout_constraintStart_toStartOf="#+id/spaceStationIcon"
app:layout_constraintTop_toBottomOf="#+id/spaceStationIcon" />
<TextView
android:id="#+id/textView1"
android:layout_width="124dp"
android:layout_height="98dp"
android:layout_marginEnd="40dp"
android:background="#color/colorPrimary"
android:gravity="center"
android:paddingEnd="20dp"
android:text="#string/dca"
android:textColor="#android:color/white"
app:layout_constraintBottom_toBottomOf="#+id/doubleArrowsIcon"
app:layout_constraintEnd_toEndOf="#+id/doubleArrowsIcon"
app:layout_constraintTop_toTopOf="#+id/doubleArrowsIcon" />
<TextView
android:id="#+id/roverLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="#string/rovers"
app:layout_constraintEnd_toEndOf="#+id/roverIcon"
app:layout_constraintStart_toStartOf="#+id/roverIcon"
app:layout_constraintTop_toBottomOf="#+id/roverIcon" />
<TextView
android:id="#+id/textView2"
android:layout_width="124dp"
android:layout_height="98dp"
android:layout_marginStart="40dp"
android:background="#color/colorPrimary"
android:gravity="center"
android:paddingStart="20dp"
android:text="#string/mars"
android:textColor="#android:color/white"
app:layout_constraintBottom_toBottomOf="#+id/doubleArrowsIcon"
app:layout_constraintStart_toStartOf="#+id/doubleArrowsIcon"
app:layout_constraintTop_toTopOf="#+id/doubleArrowsIcon" />
<TextView
android:id="#+id/flightsLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="#string/flights"
app:layout_constraintEnd_toEndOf="#+id/flightsIcon"
app:layout_constraintStart_toStartOf="#+id/flightsIcon"
app:layout_constraintTop_toBottomOf="#+id/flightsIcon" />
<ImageView
android:id="#+id/doubleArrowsIcon"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginBottom="40dp"
android:src="#drawable/double_arrows"
app:layout_constraintBottom_toTopOf="#+id/guideline1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<Switch
android:id="#+id/switch1"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="200dp"
android:background="#color/colorAccent"
android:checked="false"
android:padding="8dp"
android:switchPadding="24dp"
android:text="#string/one_way"
android:textColor="#android:color/white"
app:layout_constraintStart_toStartOf="#+id/guideline2"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="#color/colorAccent"
android:padding="8dp"
android:text="#string/traveller"
android:textColor="#android:color/white"
app:layout_constraintStart_toStartOf="#+id/guideline2"
app:layout_constraintTop_toBottomOf="#+id/switch1" />
<ImageView
android:id="#+id/rocketIcon"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_marginEnd="8dp"
android:src="#drawable/rocket_icon"
app:layout_constraintCircle="#id/galaxyIcon"
app:layout_constraintCircleAngle="270"
app:layout_constraintCircleRadius="100dp" />
<ImageView
android:id="#+id/galaxyIcon"
android:layout_width="90dp"
android:layout_height="90dp"
android:src="#drawable/galaxy"
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="#+id/guideline1"
app:layout_constraintVertical_bias="0.495" />
<Button
android:id="#+id/departButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/depart"
android:textColor="#android:color/white"
app:backgroundTint="#color/colorPrimary"
app:layout_constraintBottom_toBottomOf="parent"
tools:layout_editor_absoluteX="158dp" />
<android.support.constraint.Guideline
android:id="#+id/guideline1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="0dp" />
<android.support.constraint.Guideline
android:id="#+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintGuide_percent="1" />
</android.support.constraint.ConstraintLayout>
`
can anyone tell me what I might be missing or how this can be fixed?
Thanks in advance.

You're suppose to reference a view from the xml before you can use it.
Do this, also if the name of the layout the MainActivity is suppose to use is main.xml, it should be the one your setContentView use not some other layout.
lateinit var cosntraintLayout: ConstraintLayout
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.main) // <- main.xml
cosntraintLayout = findViewById<ConstraintLayout>(R.id.ConstraintLayout) // <- add this line
...
...
}
switch1 and departButton will also throw the same error, but I'll leave it for you to figure it out based on the code I provided.

Add and Remove Views in Android Dynamically in Kotlin

I modified my code by referring to the "https://www.tutorialspoint.com/add-and-remove-views-in-android-dynamically-in-kotlin". There was no error in my code, but the view added when running in the app was not visible. I have no idea what the problem is. Please help me!!
Activity to which the view is added
package com.akj.callback
import android.content.Context
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.widget.*
import com.akj.callback.databinding.ActivitySearchSubject2Binding
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.activity_search_subject_2.*
import kotlinx.android.synthetic.main.activity_search_subject_2.to_go_check
import kotlinx.android.synthetic.main.choiced_subject_list.*
import java.util.*
class search_subject_2 : AppCompatActivity() {
lateinit var binding3:ActivitySearchSubject2Binding
private var parentLinearLayout: LinearLayout? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_search_subject_2)
parentLinearLayout = findViewById(R.id.parent_linear_layout)
binding3= ActivitySearchSubject2Binding.inflate(layoutInflater)
setContentView(binding3.root)
userList3.onItemClickListener= AdapterView.OnItemClickListener{
parent, view, position, id ->
//parent?.getItemAtPosition(position).toString()
onAddField()
}
val user = arrayOf("abc", "bcd", "cde", "def", "efg")
val userAdapter: ArrayAdapter<String> = ArrayAdapter(
this,android.R.layout.simple_list_item_1,user)
to_go_check.setOnClickListener {
val intent6=Intent(this#search_subject_2,checkthesetting::class.java)
startActivity(intent6)
}
binding3.searchView3.setOnQueryTextListener(object :androidx.appcompat.widget.SearchView.OnQueryTextListener{
override fun onQueryTextSubmit(query: String?): Boolean {
binding3.searchView3.clearFocus()
if(user.contains(query)){
userAdapter.filter.filter(query)
}
return false
}
override fun onQueryTextChange(newText: String?): Boolean {
if(newText==""){
}
else{
binding3.userList3.adapter=userAdapter
userAdapter.filter.filter(newText)
}
return false
}
})
}
fun onDelete(view: View) {
parentLinearLayout!!.removeView(view.parent as View)
}
fun onAddField() {
val inflater =
getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
val rowView: View = inflater.inflate(R.layout.choiced_subject_list, null)
parentLinearLayout!!.addView(rowView, parentLinearLayout!!.childCount - 1)
Toast.makeText(applicationContext,"fdsvkgjh", Toast.LENGTH_SHORT).show()
}
}
choiced_subject_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal">
<TextView
android:id="#+id/number_edit_text"
android:text="title_fdskhdsffsd"
android:textColor="#color/black"
android:textSize="30dp"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="5"
android:inputType="phone"
/>
<Button
android:id="#+id/delete_button"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_weight="1"
android:background="#android:drawable/ic_delete"
android:onClick="onDelete" />
</LinearLayout>
activity_search_subject_2.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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".search_subject_2">
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.04" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.94" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.03" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.97" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.06" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.11" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.87" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.5" />
<androidx.appcompat.widget.SearchView
android:id="#+id/searchView3"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#drawable/coner_search_bar"
android:theme="#style/AppSearchView"
app:layout_constraintBottom_toTopOf="#id/guideline6"
app:layout_constraintEnd_toEndOf="#id/guideline4"
app:layout_constraintStart_toStartOf="#id/guideline3"
app:layout_constraintTop_toBottomOf="#id/guideline5"
app:queryHint="강좌 검색"
app:iconifiedByDefault="false"
/>
<androidx.appcompat.widget.AppCompatButton
android:id="#+id/to_go_check"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toEndOf="#id/guideline3"
app:layout_constraintEnd_toStartOf="#id/guideline4"
app:layout_constraintTop_toBottomOf="#id/guideline1"
app:layout_constraintBottom_toTopOf="#id/guideline2"
app:layout_constraintVertical_bias="0.98"
android:text="확인"
android:textColor="#FFF"
android:textSize="20dp"
android:background="#drawable/coner_search_bar"
android:stateListAnimator="#null"
/>
<HorizontalScrollView
android:id="#+id/scrollView"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:scrollbars="none"
app:layout_constraintBottom_toTopOf="#+id/to_go_check"
app:layout_constraintEnd_toStartOf="#id/guideline4"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="#id/guideline3"
>
<LinearLayout
android:id="#+id/linear_button"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal"
>
<androidx.appcompat.widget.AppCompatButton
android:id="#+id/njklsfd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:background="#drawable/search_subject_bar"
android:stateListAnimator="#null"
android:text="전공검색" />
<androidx.appcompat.widget.AppCompatButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:background="#drawable/search_subject_bar"
android:stateListAnimator="#null"
android:text="교양검색" />
<androidx.appcompat.widget.AppCompatButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:background="#drawable/search_subject_bar"
android:stateListAnimator="#null"
android:text="교수검색" />
<androidx.appcompat.widget.AppCompatButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:background="#drawable/search_subject_bar"
android:stateListAnimator="#null"
android:text="정렬" />
<androidx.appcompat.widget.AppCompatButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:background="#drawable/search_subject_bar"
android:stateListAnimator="#null"
android:text="학점:3" />
<androidx.appcompat.widget.AppCompatButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:background="#drawable/search_subject_bar"
android:stateListAnimator="#null"
android:text="학점:2" />
<androidx.appcompat.widget.AppCompatButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:background="#drawable/search_subject_bar"
android:text="학점:1"
/>
</LinearLayout>
</HorizontalScrollView>
<ListView
android:id="#+id/userList3"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="#+id/guideline8"
app:layout_constraintEnd_toStartOf="#+id/guideline4"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="#id/guideline3"
app:layout_constraintTop_toTopOf="#+id/guideline6"
app:layout_constraintVertical_bias="0.0" />
<LinearLayout
android:orientation="vertical"
android:id="#+id/parent_linear_layout"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="7dp"
android:layout_marginBottom="7dp"
app:layout_constraintBottom_toTopOf="#id/scrollView"
app:layout_constraintEnd_toStartOf="#+id/guideline4"
app:layout_constraintStart_toEndOf="#id/guideline3"
app:layout_constraintTop_toBottomOf="#id/guideline8" />
</androidx.constraintlayout.widget.ConstraintLayout>

Try this:
val inflater = getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
val rowView: View = inflater.inflate(R.layout.row_child_view, null, false)
Mainview.removeView(rowView)

How to fix a Recyclerview that doesn't scroll smoothly?

I am using a RecyclerView with LinearLayoutManager to fetch Data that I get from my API using Retrofit.
The problem is whenever I try to scroll down it goes to the first position.
Some answers on Github & Here, suggested decreasing the image' resolution and avoid using focusable objects but none of these solutions worked for me.
This is my RecyclerView declaration
<android.support.v7.widget.RecyclerView
app:layout_constraintTop_toBottomOf="#id/btn_rech"
app:layout_constraintStart_toStartOf="parent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="50dp"
android:descendantFocusability="beforeDescendants"
android:id="#+id/recyler_view_voiture_occasion">
</android.support.v7.widget.RecyclerView>
This is the CardView item that I use to bind data
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="340dp"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:ignore="MissingConstraints"
app:cardCornerRadius="10sp"
android:elevation="15dp"
android:background="#color/colorGrey"
app:cardBackgroundColor="#color/colorLightGrey"
android:layout_margin="7dp"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="170dp"
android:background="#color/colorWhite"
android:scaleType="centerCrop"
android:id="#+id/annonce_image"
/>
<android.support.v7.widget.AppCompatTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="2dp"
android:text="#string/general"
android:layout_below="#+id/annonce_image"
android:layout_alignStart="#id/annonce_image"
android:layout_marginStart="10dp"
android:textAppearance="#android:style/TextAppearance.Material.Widget.Toolbar.Title"
android:id="#+id/annonce_info"
/>
<android.support.v7.widget.AppCompatTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#android:style/TextAppearance.Material.Widget.Toolbar.Subtitle"
android:padding="2dp"
android:layout_marginStart="10dp"
android:id="#+id/annonce_price_info"
android:layout_below="#+id/annonce_info"
android:text="this is a sample text"
/>
<android.support.v7.widget.LinearLayoutCompat
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:backgroundTint="#ffffff"
android:outlineProvider="#color/colorPrimaryDark"
android:orientation="horizontal"
android:layout_marginTop="10dp"
android:weightSum="90"
android:background="#drawable/item_edit_versement"
android:layout_below="#id/annonce_price_info"
android:layout_marginHorizontal="10dp"
android:padding="5dp"
android:id="#+id/infos_holder"
>
<android.support.v7.widget.AppCompatTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/annonce_km"
android:layout_weight="30"
android:textAlignment="center"
android:text="#string/prix"
android:textSize="14sp"
android:fontFamily="sans-serif-medium"
/>
<android.support.v7.widget.AppCompatTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/annonce_annee"
android:textAlignment="center"
android:layout_weight="30"
android:text="#string/prix"
android:textSize="14sp"
android:fontFamily="sans-serif-medium"
/>
<android.support.v7.widget.AppCompatTextView
android:layout_width="wrap_content"
android:layout_weight="30"
android:id="#+id/annonce_fuel"
android:textAlignment="center"
android:layout_height="wrap_content"
android:text="#string/Fuel"
android:textSize="14sp"
android:fontFamily="sans-serif-medium"
/>
</android.support.v7.widget.LinearLayoutCompat>
<android.support.v7.widget.LinearLayoutCompat
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_marginTop="12dp"
android:weightSum="100"
android:gravity="center"
android:layout_below="#id/infos_holder"
android:layout_height="wrap_content">
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/item_edit_versement"
android:layout_marginHorizontal="10dp"
android:layout_weight="40"
android:textStyle="bold"
android:textColor="#color/colorPrimaryDark"
android:textSize="14sp"
android:text="Faire un offre"
/>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/item_edit_versement"
android:backgroundTint="#424242"
android:drawableStart="#drawable/phone"
android:paddingStart="15dp"
android:text="Call owner"
android:textColor="#color/colorWhite"
android:textStyle="bold"
android:textSize="15sp"
android:layout_marginHorizontal="10dp"
android:layout_weight="35"
/>
</android.support.v7.widget.LinearLayoutCompat>
</RelativeLayout>
</android.support.v7.widget.CardView>
This is my part of Code where I get the data from DB and adapt it into the RV
fun prepareRecyclerView(v : View, id : String){
val layout = LinearLayoutManager(v.context)
layout.orientation = LinearLayoutManager.VERTICAL
val adapter = v.findViewById<RecyclerView>(R.id.recyler_view_voiture_occasion)
adapter.layoutManager = layout
val annonceAdapter = OccasionCarsAdapter(v.context,annonceList )
adapter.adapter = annonceAdapter
//initLineaire(v , R.id.recyler_view_voiture_occasion, LinearLayoutManager.VERTICAL ,annonceAdapter as RecyclerView.Adapter<RecyclerView.ViewHolder>)
}
fun getAnnonceList(id: String, maView: View, filters: VehiculeRechFilters?){
val service = prepareService()
val requestCall = service.GetOccasionAnnouncement(id,
filters!!.minPrix, filters.maxPrix, filters.minAnnee,
filters.minAnnee, filters.maxKm, filters.codeVersion)
requestCall.enqueue(object : Callback<List<VehiculeOccasion>> {
override fun onFailure(call: Call<List<VehiculeOccasion>>, t: Throwable) {
Log.e("Call response" , "Can't get the data" , t.cause)
}
override fun onResponse(call: Call<List<VehiculeOccasion>>, response: Response<List<VehiculeOccasion>>) {
if(response.isSuccessful){
Toast.makeText(this#CustomOccasionFragment.context,response.body().toString(), Toast.LENGTH_LONG).show()
for (e in response.body()!!){
annonceList.add(e)
}
prepareRecyclerView(maView!! ,idUser)
}
else {
Log.i("response assert" , "couldn't get the data correctly")
}
}
})
}

Kotlin : same fragment, children with same tag

In my fragment, I have two linear layout with the same tag "result". Inside theses linear layouts, I have another layout with the tag "toggle" and a button with the tag "toggleButton".
I want that : when I click on my button, it toggle the linear layout "toggle" of its linear layout parent "result"
But when I do this :
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val root = rootLayoutResultSearch
root.findViewWithTag<Button>("toToggleButton")
val buttonToggle = view.findViewWithTag<Button>("toToggleButton")
buttonToggle.setOnClickListener{
Log.i(TAG, "click")
val toggle = view.findViewWithTag<LinearLayout>("toToggle")
if(toggle.visibility == View.GONE){
toggle.visibility = View.VISIBLE
}else{
toggle.visibility = View.GONE
}
}
}
it's working only for my first linear layout "result". When I click on my second button, it's not doing anything
Here the xml of the layouts "result" (I only post the first, the second is the exact same one)
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:tag="result"
android:contentDescription="result">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="35dp"
android:background="#drawable/whit_bg_and_shadow"
android:tag="visibleNotChangeable"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
style="#style/hoursSearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".1"
android:fontFamily="#font/rubik_medium_italic"
android:tag="heureDepart"
android:text="#string/fillHoursRecherche1"
android:textStyle="italic" />
<TextView
style="#style/citySearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp"
android:layout_weight=".9"
android:fontFamily="#font/rubik_medium"
android:tag="villeDepart"
android:text="#string/fillVilleRecherche1"
android:textSize="18sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
style="#style/hoursSearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".1"
android:fontFamily="#font/rubik_medium_italic"
android:tag="heureDepart"
android:text="#string/fillHoursRecherche2"
android:textFontWeight="500"
android:textStyle="italic" />
<TextView
style="#style/citySearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp"
android:layout_weight=".9"
android:fontFamily="#font/rubik_medium"
android:tag="villeDepart"
android:text="#string/fillVilleRecherche2"
android:textSize="18sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="end"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp"
android:fontFamily="#font/roboto"
android:tag="villeArrivee"
android:text="#string/jourCircuRecherche" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/roboto"
android:tag="villeArrivee"
android:text="#string/fillJourCircuRecherche" />
</LinearLayout>
<View style="#style/HorizontalLine" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/bus" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginStart="15dp"
android:background="#drawable/dark_blue_rectangle"
android:text="3"
android:textColor="#color/colorWhite" />
</LinearLayout>
<View style="#style/HorizontalLine" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="20dp"
android:layout_height="20dp"
android:src="#drawable/horaire" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginStart="15dp"
android:fontFamily="#font/roboto"
android:text="#string/fillTempsRecherche" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="35dp"
android:background="#drawable/gray_bg"
android:visibility="gone"
android:tag="toToggle"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
style="#style/hoursSearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".1"
android:fontFamily="#font/rubik_medium_italic"
android:tag="heureDepart"
android:text="#string/fillHoursRecherche1"
android:textStyle="italic" />
<TextView
style="#style/citySearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp"
android:layout_weight=".9"
android:fontFamily="#font/rubik_medium"
android:tag="villeDepart"
android:text="#string/fillVilleRecherche1"
android:textSize="18sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
style="#style/hoursSearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".1"
android:fontFamily="#font/rubik_medium_italic"
android:tag="heureDepart"
android:text="#string/fillHoursRecherche2"
android:textFontWeight="500"
android:textStyle="italic" />
<TextView
style="#style/citySearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp"
android:layout_weight=".9"
android:fontFamily="#font/rubik_medium"
android:tag="villeDepart"
android:text="#string/fillVilleRecherche2"
android:textSize="18sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="end"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp"
android:fontFamily="#font/roboto"
android:tag="villeArrivee"
android:text="#string/jourCircuRecherche" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/roboto"
android:tag="villeArrivee"
android:text="#string/fillJourCircuRecherche" />
</LinearLayout>
<View style="#style/HorizontalLine" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/bus" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginStart="15dp"
android:background="#drawable/dark_blue_rectangle"
android:text="3"
android:textColor="#color/colorWhite" />
</LinearLayout>
<View style="#style/HorizontalLine" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="20dp"
android:layout_height="20dp"
android:src="#drawable/horaire" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginStart="15dp"
android:fontFamily="#font/roboto"
android:text="#string/fillTempsRecherche" />
</LinearLayout>
</LinearLayout>
<Button
android:id="#+id/ToggleSearchResult"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="#drawable/arrow_down_blue_circle"
android:layout_gravity="center"
android:layout_marginTop="-20dp"
android:tag="toToggleButton"
/>
</LinearLayout>

Okay, I've thrown together a quick idea of what I think you want to accomplish. It excludes all the error and consistency checking one would normally want to do.
package com.example.toggler
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.View
import android.widget.LinearLayout
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val list = arrayListOf<View>()
root_View.findViewsWithText(list, "toToggleButton", View.FIND_VIEWS_WITH_CONTENT_DESCRIPTION)
list.forEach { button ->
button.setOnClickListener { v: View ->
val viewParent = v.parent
if (viewParent is LinearLayout) {
val taggedView = viewParent.findViewWithTag<View>("toggle")
taggedView.visibility = when {
taggedView.visibility == View.GONE -> View.VISIBLE
else -> View.GONE
}
}
}
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/root_View"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:contentDescription="toToggleButton"
android:tag="toToggleButton"
android:text="toggle"
tools:ignore="HardcodedText" />
<View
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#F44336"
android:tag="toggle" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:contentDescription="toToggleButton"
android:tag="toToggleButton"
android:text="toggle"
tools:ignore="HardcodedText" />
<View
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#9C27B0"
android:tag="toggle" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:contentDescription="toToggleButton"
android:tag="toToggleButton"
android:text="toggle"
tools:ignore="HardcodedText" />
<View
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#FFEB3B"
android:tag="toggle" />
</LinearLayout>
</LinearLayout>
[EDIT]
Or, if you prefer to use tags:
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
root_View.findViewsWithTag("toToggleButton").forEach { button ->
button.setOnClickListener { v: View ->
val viewParent = v.parent
if (viewParent is LinearLayout) {
val taggedView = viewParent.findViewWithTag<View>("toggle")
taggedView.visibility = when {
taggedView.visibility == View.GONE -> View.VISIBLE
else -> View.GONE
}
}
}
}
}
}
private fun ViewGroup.findViewsWithTag(tag: String): Sequence<View> {
return sequence {
for (index in 0 until childCount) {
val child = getChildAt(index)
when (child) {
is ViewGroup -> yieldAll(child.findViewsWithTag(tag))
is View -> if (child.tag == tag) yield(child)
}
}
}
}

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