I've created a basic layout in Android in my activity_main.xml for what will eventually be a custom view for a button. It is a relative view with three circles stacked on top of eachother inside it aligned in the centre. The circles change size when the user interacts with them.
I now want to replicate the whole thing purely in Kotlin code, as it will be loaded using data in a database.
I can't figure it out. Heres the manifest...
<?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"
android:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity">
<RelativeLayout
android:id="#+id/myContainer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ImageView
android:id="#+id/button3"
android:layout_width="400dp"
android:layout_height="400dp"
android:layout_centerInParent="true"
app:srcCompat="#drawable/circle"
app:tint="#E60505" />
<ImageView
android:id="#+id/button2"
android:layout_width="400dp"
android:layout_height="400dp"
android:layout_centerInParent="true"
app:srcCompat="#drawable/circle"
app:tint="#FFB700" />
<ImageView
android:id="#+id/button1"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_alignParentRight="false"
android:layout_centerInParent="true"
app:srcCompat="#drawable/circle" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
Then in Kotlin, all I can find about is LayoutParams for width and height, but where do I set all this stuff for the Relative Layout?
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
which I presume I want to do something like:
class MyContainer : RelativeLayout () {
var button1 = MyButtonClass(someArgs)
var button2 = MyButtonClass(someArgs)
var button3 = MyButtonClass(someArgs)
init {
/// can't find out how to do this bit in Kotlin...
///something like....
this.layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT
this.layoutConstraintBottomToBottomOf = PARENT
this.layoutConstraintHorizontalBias = 0.5
///etc...
//then add the circle buttons
this.addView(button3)
this.addView(button2)
this.addView(button1)
}
}
Am I even vagueley on the right track? Any pointers would be really appreciated.
EDIT: Following first answer, I can set layout attributes, but my app is just blank when i try to reproduce my original manifest tree in code. Have I applied this correctly?
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val appContainer = findViewById<ConstraintLayout>(R.id.appContainer)
var buttonContainer = ButtonContainer(this.applicationContext)
appContainer.addView(buttonContainer)
}
}
class ButtonContainer (context: Context) : RelativeLayout(context) {
var button1 = CustomButton(context)
val buttonLayoutParams by lazy { ConstraintLayout.LayoutParams(ConstraintLayout.LayoutParams.WRAP_CONTENT, ConstraintLayout.LayoutParams.WRAP_CONTENT).apply {
bottomToBottom = ConstraintLayout.LayoutParams.PARENT_ID
startToStart = ConstraintLayout.LayoutParams.PARENT_ID
topToTop = ConstraintLayout.LayoutParams.PARENT_ID
endToEnd = ConstraintLayout.LayoutParams.PARENT_ID
horizontalBias = 0.5F
}
}
override fun onFinishInflate() {
super.onFinishInflate()
this.layoutParams = buttonLayoutParams
this.addView(button1)
}
}
class CustomButton(context: Context) : ImageView(context) {
val layoutParams by lazy { RelativeLayout.LayoutParams(60, 60).apply {
addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE)
}
}
override fun onFinishInflate() {
super.onFinishInflate()
setLayoutParams(layoutParams)
setBackgroundResource(squibcircle)
}
}
You need to cast LayoutParams as ConstraintLayout.LayoutParams to set those properties like below
class ButtonContainer(context: Context) : RelativeLayout(context) {
var button1 = CustomButton(context)
val buttonLayoutParams by lazy { ConstraintLayout.LayoutParams(ConstraintLayout.LayoutParams.WRAP_CONTENT, ConstraintLayout.LayoutParams.WRAP_CONTENT).apply {
bottomToBottom = ConstraintLayout.LayoutParams.PARENT_ID
startToStart = ConstraintLayout.LayoutParams.PARENT_ID
topToTop = ConstraintLayout.LayoutParams.PARENT_ID
endToEnd = ConstraintLayout.LayoutParams.PARENT_ID
horizontalBias = 0.5F
}
}
override fun onFinishInflate() {
this.layoutParams = buttonLayoutParams
this.addView(button1)
}
}
Related
I am trying to make a drawing app but when I am setting the brush size seek and try to make a text view to show its size it is always returning null I tried multiple ways but it didn't succeed so please can any one help me fix the poblems in this code so the text shows the seekbar progress text
class MainActivity : AppCompatActivity() {
private var ibBrush: ImageView? = null
private var tvBrushSize: TextView? = null
private var sbBrushSize: SeekBar?= null
override fun onCreate(savedInstanceState: Bundle?) {
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
ibBrush = findViewById(R.id.ib_brush)
ibBrush?.setOnClickListener{
changeBrushSize()
}
}
private fun changeBrushSize(){
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
val brushDialog = Dialog(this)
brushDialog.setContentView(R.layout.brush_size_dialog)
tvBrushSize = findViewById(R.id.tv_brush_size)
sbBrushSize = findViewById(R.id.sb_brush_size)
tvBrushSize?.text = sbBrushSize?.progress.toString()
brushDialog.show()
}
}
Why tvBrushSize is returning null while I am setting it to findViewById() to the correct id in xml
*here is the 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="wrap_content"
android:layout_height="match_parent"
android:padding="10dp"
android:orientation="vertical"
>
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/brush_size"
android:gravity="center"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="#+id/linear"/>
<LinearLayout
android:layout_width="350dp"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView">
<SeekBar
android:id="#+id/sb_brush_size"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="10"
android:max="30"
/>
<TextView
android:id="#+id/tv_brush_size"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="#string/_0" />
</LinearLayout>
</LinearLayout>
You should inflate the dialog view first using LayoutInflater.inflate(layoutId) and then use view.findViewById(id) like this snippet:
private fun changeBrushSize(){
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
val brushDialog = Dialog(this)
val dialogView = LayoutInflater.inflate(R.layout.brush_size_dialog, null)
brushDialog.setContentView(dialogView)
tvBrushSize = dialogView.findViewById(R.id.tv_brush_size)
sbBrushSize = dialogView.findViewById(R.id.sb_brush_size)
tvBrushSize?.text = sbBrushSize?.progress.toString()
brushDialog.show()
}
you need to bind views from dialog, so manage it like this;
brushDialog.setContentView(R.layout.brush_size_dialog)
val dialogView = layoutInflater.inflate(R.layout.brush_size_dialog, null)
brushDialog.setContentView(dialogView)
tvBrushSize = dialogView.findViewById(R.id.tv_brush_size)
the dialog with your view is not yet existed, when you are trying to refer it with findViewById()
You can inflate view first, then access it as follows
val brushDialog = Dialog(this)
val view = layoutInflater.inflate(R.layout.brush_size_dialog, null)
brushDialog.setContentView(view)
tvBrushSize = view.findViewById(R.id.tv_brush_size)
sbBrushSize = view.findViewById(R.id.sb_brush_size)
tvBrushSize?.text = sbBrushSize?.progress.toString()
brushDialog.show()
or call brushDialog.show() first and then access views with findViewById()
that also should work
You should inflate the view first
val dialogView = LayoutInflater.inflate(R.layout.brush_size_dialog, null)
brushDialog.setContentView(dialogView)
then try to use
dialogView.findViewById(...)
I am trying to create a horizontal recycler view with dynamic height by following this stack overflow post. The solution seems working. But the recycler view items disappear when I try to remove an item from recycler view.
recyclerview layout:
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:clipToPadding="false"
android:orientation="horizontal"
android:paddingStart="13dp"
android:paddingEnd="13dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
Recycler view item layout:
<androidx.cardview.widget.CardView
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"
android:layout_marginEnd="4dp"
android:layout_marginStart="4dp"
app:cardBackgroundColor="#BCAAAA"
app:cardElevation="2dp">
<TextView
android:padding="36dp"
android:id="#+id/textViewName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="22sp"
tools:text="Test String"/>
</androidx.cardview.widget.CardView>
Activity:
val flexBoxLayoutManager = FlexboxLayoutManager(this, FlexDirection.ROW, FlexWrap.NOWRAP)
with(recyclerView) {
layoutManager = flexBoxLayoutManager
adapter = RecyclerViewAdapter()
setHasFixedSize(false)
}
Adapter:
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
var textViewName: TextView = itemView.findViewById(R.id.textViewName)
init {
updateLayoutParamsToAllowHorizontalScrolling()
}
private fun updateLayoutParamsToAllowHorizontalScrolling() {
(itemView.layoutParams as? FlexboxLayoutManager.LayoutParams)?.let {
it.flexShrink = 0.0f
it.alignSelf = AlignItems.FLEX_START
}
}
}
override fun onBindViewHolder(holder: RecyclerViewAdapter.ViewHolder, position: Int) {
val item = listItems[position]
var msg = "Sample item no:$position "
for(i in 0..position){
msg += "dynamic content \n"
}
holder.textViewName.text = msg
holder.itemView.setOnClickListener {
val pos = listItems.indexOf(item)
listItems.removeAt(pos)
notifyItemRemoved(pos)
}
}
A screen recording of the output:
Is there any way to fix this issue? Or Are there any other approach to implement horizontal recyclerveiw with dynamic height?
I have fixed the issue without using FlexBoxLayoutManger.
Used LinearLayoutManager with horizontal orientation and the following code in onBindViewHolder in RecyclerViewAdapter.
holder.itemView.post {
val wMeasureSpec =
View.MeasureSpec.makeMeasureSpec(holder.itemView.width, View.MeasureSpec.EXACTLY)
val hMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)
holder.itemView.measure(wMeasureSpec, hMeasureSpec)
if (holder.itemView.measuredHeight > holder.itemView.height) {
holder.itemView.layoutParams =
(holder.itemView.layoutParams as ViewGroup.LayoutParams)
.apply {
height = holder.itemView.measuredHeight
}
}
}
I have an activity with recycleView this is what I should show in design
I use this code to show it
val arr:ArrayList<string> = arrayListOf("English","Intermediate","English","English","arr","UICollectionViewFlowLayoutFlowFlowFlow","English","UICollectionViewDelegate","English","Intermediate","UIViewController","viewDidLoad","Intermediate","String","Intermediate","arr","Intermediate","UIKit","Intermediate","English","columnLayout","English","languageLabel")
recyclerView.setLayoutDirection(View.LAYOUT_DIRECTION_RTL)
recyclerView.layoutManager = GridLayoutManager(this, 3)
adaAdapter = CustomAdapter(this, arr)
recyclerView.adapter = adaAdapter
With this adapter
class CustomAdapter(val context: DreamsActivity, val items: ArrayList<String>) : RecyclerView.Adapter<CustomAdapter.ViewHolderProductList>() {
// holds this device's screen width,
private var screenWidth = 0
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolderProductList {
val displayMetrics = DisplayMetrics()
context.windowManager.getDefaultDisplay().getMetrics(displayMetrics)
screenWidth = displayMetrics.widthPixels
val layoutInflater = LayoutInflater.from(parent.context)
val cellForRow = layoutInflater.inflate(R.layout.dreams_collection,parent, false)
val devicewidth: Int = (displayMetrics.widthPixels / 3) - 10
val params = cellForRow.getLayoutParams() as GridLayoutManager.LayoutParams
params.width = devicewidth
cellForRow.setLayoutParams(params)
return ViewHolderProductList(cellForRow)
}
override fun getItemCount(): Int {
return items.size
}
override fun onBindViewHolder(holder: ViewHolderProductList, position: Int) {
val item = items[position]
holder.typeTv.text = item
}
inner class ViewHolderProductList(itemView: View) : RecyclerView.ViewHolder(itemView) {
var typeTv: TextView = itemView.findViewById(R.id.typeTv)
var mainL: ConstraintLayout = itemView.findViewById(R.id.mainL)
}
}
With this 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=".MainActivity">
<RecyclerView
android:id="#+id/recyclerView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="10dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="10dp"
android:layout_marginBottom="15dp"
android:background="#FFFFFF"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
And Item 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:id="#+id/mainL"
android:layout_width="60dp"
android:padding="10dp"
android:layout_height="wrap_content">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/typeTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="5dp"
android:layout_marginBottom="5dp"
android:text="TextView"
android:textSize="14sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
But I got this
And don't know how to do it as I need the number of items to be dynamic according to the text length but the GridLayoutManager only sets the number of columns static.
Any help is greatly appreciated
The desired layout tends to be Chips rather than a RecyclerView
Here is a demo:
Material app gradle dependency: implementation 'com.google.android.material:material:1.4.0'
Layout:
<com.google.android.material.chip.ChipGroup xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/my_chip_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
app:chipSpacing="16dp"
app:chipSpacingHorizontal="4dp"
app:chipSpacingVertical="4dp" />
Adding chips:
val arr =
arrayListOf(
"English",
"Intermediate",
"English",
"English",
"arr",
"UICollectionViewFlowLayoutFlowFlowFlow",
"English",
"UICollectionViewDelegate",
"English",
"Intermediate",
"UIViewController",
"viewDidLoad",
"Intermediate",
"String",
"Intermediate",
"arr",
"Intermediate",
"UIKit",
"Intermediate",
"English",
"columnLayout",
"English",
"languageLabel"
)
fun addChips(context: Context) {
val chipGroup = findViewById<ChipGroup>(R.id.my_chip_group)
for (i in 0 until arr.size) {
val chip = Chip(context)
chip.layoutParams = FrameLayout.LayoutParams(WRAP_CONTENT, WRAP_CONTENT)
chip.text = arr[i]
chipGroup.addView(chip)
}
}
What you're asking for is something with the visual look of a Chip from Material Components. While the documentation for Chips suggests putting them in a ChipGroup, this loses the benefit of recycling views if you have more than enough to cover the screen. On the other hand, if they need to behave like a RadioGroup, where you can select only one to be toggled at a time, then ChipGroup would be easier to use.
To do this with RecylerView, you can change your item view layouts to use a Chip instead of a TextView. Set the item's layout width to wrapContent. Then use Google's Flexbox Layout library to get the layout with variable length items.
In Gradle dependencies: implementation 'com.google.android.flexbox:flexbox:3.0.0'
In your activity:
recyclerView.layoutManager = FlexboxLayoutManager(this)
.apply { flexDirection = FlexDirection.ROW }
Result:
There's a related question here that is helpful.
I am using tab layout with custom views.
The issues I am facing are the following -
1) The text is being cut off with small screen devices as you can see here -
small device -
big device -
2) the second issue I am facing is as you can see, the background does not go wrap content on "Chats" tabs. It does through wrap the "Market" tab title as it is longer. I need it to wrap quallity with short and long texts.
here is my xml -
<androidx.appcompat.widget.Toolbar
android:id="#+id/activity_dashboard_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:titleTextColor="#color/transparent">
<de.hdodenhof.circleimageview.CircleImageView
android:layout_width="35dp"
android:layout_height="35dp"
android:src="#drawable/user_default_image"
app:civ_border_color="#color/black"
app:civ_border_width="1dp" />
</androidx.appcompat.widget.Toolbar>
<com.google.android.material.tabs.TabLayout
android:id="#+id/activity_dashboard_tablayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#+id/activity_dashboard_toolbar"
app:tabIndicator="#null" />
<androidx.viewpager2.widget.ViewPager2
android:id="#+id/activity_dashboard_viewpager"
android:layout_width="match_parent"
android:layout_height="600dp"
app:layout_constraintTop_toBottomOf="#+id/activity_dashboard_tablayout" />
private fun initTabLayoutAndViewPager() {
setSupportActionBar(toolbar)
supportActionBar?.title = null
viewpager.adapter = DashboardViewPagerAdapter(this)
TabLayoutMediator(tabLayout, viewpager, TabLayoutMediator.TabConfigurationStrategy { _, _ -> }).attach()
val chatsView = View.inflate(this, R.layout.dashboard_activity_cusom_tab, null)
val callsView = View.inflate(this, R.layout.dashboard_activity_cusom_tab, null)
val walletView = View.inflate(this, R.layout.dashboard_activity_cusom_tab, null)
val marketView = View.inflate(this, R.layout.dashboard_activity_cusom_tab, null)
(chatsView as TextView).text = pageTitles[0]
(callsView as TextView).text = pageTitles[1]
(walletView as TextView).text = pageTitles[2]
(marketView as TextView).text = pageTitles[3]
chatTextView = chatsView
callsTextView = callsView
walletTextView = walletView
marketTextView = marketView
tabLayout.getTabAt(0)?.customView = chatTextView
tabLayout.getTabAt(1)?.customView = callsTextView
tabLayout.getTabAt(2)?.customView = walletTextView
tabLayout.getTabAt(3)?.customView = marketTextView
viewpager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
override fun onPageSelected(position: Int) {
super.onPageSelected(position)
when(position) {
DashboardTabs.CHATS.type -> {
ViewPagerUtils.setSelectedTab(chatTextView, callsView, walletView, marketView)
}
DashboardTabs.CALLS.type -> {
ViewPagerUtils.setSelectedTab(callsView, chatTextView, walletView, marketView)
}
DashboardTabs.WALLET.type -> {
ViewPagerUtils.setSelectedTab(walletView, callsView, chatTextView, marketView)
}
DashboardTabs.MARKET.type -> {
ViewPagerUtils.setSelectedTab(marketView, callsView, walletView, chatTextView)
}
}
}
})
}
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/roboto_medium"
android:paddingStart="5dp"
android:paddingEnd="5dp"
android:textStyle="bold"
android:textSize="18sp"
android:maxLines="1"
tools:text="Chats">
</TextView>
edit -
After resolving the issue with the answer provided here I am stuck a gravity issue -
how can I make all tabs in the center? tried both gravity and layout_gravity and none helped me.
make tab layout mode scrollable app:tabMode="scrollable" or app:tabMode="auto" like below
<com.google.android.material.tabs.TabLayout
android:id="#+id/activity_dashboard_tablayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="scrollable"
app:layout_constraintTop_toBottomOf="#+id/activity_dashboard_toolbar"
app:tabIndicator="#null" />
I set the margin of the view (card view) in my xml of my item file, this xml item file will be used in for my recyclerView adapter.
As you can see in my xml below, that I have given margin to top, bottom, start and end. and I want to change the margin from my fragment
Here is my xml file, item_category_list.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
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"
app:cardCornerRadius="8dp"
app:cardElevation="4dp"
android:id="#+id/cardView_item_category_list" android:layout_marginStart="8dp" android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp" android:layout_marginTop="8dp">
<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"
android:background="#android:color/background_light">
<ImageView
android:layout_width="0dp"
android:layout_height="0dp"
app:srcCompat="#drawable/logo_apps"
android:id="#+id/categoryImageView_Item"
android:layout_marginTop="16dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="24dp"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="24dp"
app:layout_constraintDimensionRatio="w,1:1" android:scaleType="centerCrop"/>
<TextView
android:text="#string/Category"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/categoryName_textView_item"
app:layout_constraintTop_toBottomOf="#+id/categoryImageView_Item"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginStart="4dp"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="4dp"
android:textAlignment="center"
android:minLines="1"
android:maxLines="2"
app:autoSizeTextType="uniform"
app:autoSizeMinTextSize="10sp"
app:autoSizeMaxTextSize="15sp"
app:autoSizeStepGranularity="1sp"
android:layout_marginBottom="24dp"
android:layout_marginTop="24dp"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
Here is the adapter:
class CategoryAdapter(val context: Context, val categories: List<Category>) : RecyclerView.Adapter<CategoryAdapter.ViewHolderCategory>() {
private lateinit var mListener : CategoryAdapterListener
interface CategoryAdapterListener {
fun onItemClick(position: Int)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolderCategory {
val layoutInflater = LayoutInflater.from(parent.context)
val itemView = layoutInflater.inflate(R.layout.item_category_list,parent, false)
return ViewHolderCategory(itemView,mListener)
}
override fun getItemCount(): Int {
return categories.size
}
override fun onBindViewHolder(holder: ViewHolderCategory, position: Int) {
val category = categories[position]
holder.categoryNameTextView.text = category.name
Glide
.with(context)
.load(category.getFormattedImageURL())
.into(holder.categoryImageView)
}
inner class ViewHolderCategory(itemView: View, listener: CategoryAdapterListener) : RecyclerView.ViewHolder(itemView) {
val categoryImageView = itemView.findViewById<ImageView>(R.id.categoryImageView_Item)
val categoryNameTextView = itemView.findViewById<TextView>(R.id.categoryName_textView_item)
val cardView = itemView.findViewById<CardView>(R.id.cardView_item_category_list)
init {
itemView.setOnClickListener {
val position = adapterPosition
if (position != RecyclerView.NO_POSITION) {
listener.onItemClick(position)
}
}
}
}
fun setCategoryAdapterListener(listener: CategoryAdapterListener) {
mListener = listener
}
}
and in the fragment, I set the adapter to the recycler view:
val categoryAdapter = CategoryAdapter(mContext,parentCategory)
val layoutManager = GridLayoutManager(mContext,4,RecyclerView.VERTICAL,false)
recyclerViewParentCategory.adapter = categoryAdapter
recyclerViewParentCategory.layoutManager = layoutManager
recyclerViewParentCategory.setHasFixedSize(true)
I want to change that margin in card view in my item_category_list.xml programatically in my java/kotlin file (in my fragment file), so I can change the margin from my fragment.
So how can I achieve it ? Java/Kotlin any language is preferred.
First Of all its a long way . So i'm just suggesting a way .
First of all . In your Fragment when some action happen you need to change cardview
size in adapter list item xml.
So . You need a interface for that (Let's say interface ChangeMargin). create
interface in Fragment and implement that interface in your adapter like this
class CategoryAdapter(val context: Context, val categories: List<Category>):RecyclerView.Adapter<CategoryAdapter.ViewHolderCategory>(),ChangeMargin()
For how to create interface so can go through this
Now in that interface you need to get cardview and assign new margin .
#Override
public void ChangeMargin() {
val linear_params=LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT)
linear_params.setMargins(leftMargin,topmargin,rightMargin,bottomMargin)
cardView?.layoutParams=linear_params
}
and don't forget to notify adapter
You can do something like this.
Make id of cardview , create instance of it in your adapter and do this code
ViewGroup.MarginLayoutParams layoutParams =
(ViewGroup.MarginLayoutParams) myCardView.getLayoutParams();
layoutParams.setMargins(10, 10, 10, 10);
myCardView.requestLayout();
To set margins to the cardView, you will have to create layoutParams, set margins to it and then set it as cardView LayoutParams like:
inner class ViewHolderCategory(itemView: View, listener: CategoryAdapterListener) : RecyclerView.ViewHolder(itemView) {
val categoryImageView = itemView.findViewById<ImageView>(R.id.categoryImageView_Item)
val categoryNameTextView = itemView.findViewById<TextView>(R.id.categoryName_textView_item)
val cardView = itemView.findViewById<CardView>(R.id.cardView_item_category_list)
//Main code here
val lparams=LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT)
lparams.setMargins(leftMargin,topmargin,rightMargin,bottomMargin)
cardView?.layoutParams=lparams
}