My code below doesnt work for each specific scrollto or smoothScrollTo, can anyone help me?
I basically want to be able to dynamically scroll to a specific Item position in the activity, e.g. if a specific recyclerviewItem has been clicked on it will go to the activity and scroll to the specific item. The position variable has been ranging from "recyclerview.getChildAdapterPosition(itemview)" to itemview.Bottom which also doesn't work.
Help would be appreciated.
private fun focusOnView(scroll: ScrollView, itemView : View?,position :Int) {
scroll.post(Runnable {
if (editBox != null) {
val x= 1
// scroll.scrollTo(0,NestedScrollView.FOCUS_DOWN)
// scroll.smoothScrollTo(0, scroll.bottom)
scroll.smoothScrollTo(0,position)
//scroll.fullScroll(130)
}
})
}
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/scrollView"
android:fillViewport="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<RelativeLayout
android:layout_height="wrap_content"
android:layout_width="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/contentreyclerpager"
android:layout_width="match_parent"
android:paddingTop="10dp"
android:layout_height="wrap_content" />
</RelativeLayout>
</ScrollView>
Why you use the nestedScollView smoothScrollTo with the position you have to give x,y coordonate i think in your case you can use recycleView.smoothScrollToPosition(yourPosition);
Related
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_sales_report"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="20dp"
android:clipToPadding="false"
android:paddingHorizontal="10dp"
android:paddingBottom="120dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/mtv_sales_report_date"
tools:listitem="#layout/item_reportings_new" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_dynamic_inner_reporting"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="vertical"
android:paddingBottom="10dp"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintTop_toBottomOf="#id/mtv_date_dynamic"
tools:listitem="#layout/item_inner_reporting" />
The inner recycler view is not scrolling I have tried many solutions, non helped me, how can I make the inner recycler view scroll vertically, they both scroll vertically.
android:layout_height="0dp" You shouldn't use this without setting either the layout weight or without constraining both the top and bottom of the view because without constraints, it might just act as wrap_content basically extending beyond the screen.
Also, for the inner view, if the orientation is vertical, then height shouldn't be wrap_content maybe changing that would help.
Also, just a tip, having both recycler be vertical is a bad idea because how would android (or the user) know which view you are scrolling on if they are together.
Issue is solved by showing only four items in the inner Recycler View, and enabling nestedScrollView = true, also handling OnTouch Events for the parent Recycler View.
i have a problem, i dont know how to use DataBinding for TextView. i made a DataBinding for Glide and it success, but for TextView i dont know how to do it
this is the code
viewModel2.shouldShowImageProfile.observe(this) {
Glide.with(binding.root)
.load(it)
.circleCrop()
.into(binding.rivProfile)
}
viewModel2.shouldShowUsername.observe(this){
TextView.with(binding.root) <- the TextView
.load(it)
.into(binding.tvHello)
}
I wrote my answer making an assumption about shouldShowUsername, but as that's your String value, you can do something like this:
viewModel2.shouldShowUsername.observe(this) { shouldShowUsername ->
binding.tvHello.isVisible = !shouldShowUsername.isNullOrEmpty()
binding.tvHello.text = shouldShowUsername
}
That'll cause your TextView to only be displayed when shouldShowUsername has a proper value then take that value and assign it to the TextView. If you want the TextView to always show up, you can skip that first line within the block.
If you dont want to use observe method on variables of viewmodel you can use data binding and change value of textview from the xml directly, so that you dont have to manually write binding.tvUserName.text = it.value. Below code shows example for usuage of data binding with xml and viewmodel.
XML:
<?xml version="1.0" encoding="utf-8"?>
<layout 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">
<data>
<variable
name="viewModel"
type="com.example.kotlinbasics.android_architecture.mvvm_architecture.ChatViewModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/holo_red_light"
tools:context=".android_architecture.mvvm_architecture.UserOneFragment">
<androidx.appcompat.widget.AppCompatEditText
android:id="#+id/etMessageToSecond"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/_10sdp"
android:background="#drawable/text_field_background"
android:gravity="center"
android:hint="#string/enter_message"
android:padding="#dimen/_7sdp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintWidth_percent="0.7" />
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/tvCurrentMessage"
android:text="#{`Current Message: `+viewModel.latestMessageFromFirst}"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/_50sdp"
android:padding="#dimen/_10sdp"
android:textColor="#color/white"
android:textSize="#dimen/_20ssp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/etMessageToSecond" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
In the above example I am printing the live text in textview which user writes in the edittext field. Whenever user writes in edittext, its value gets updated in the viewmodel and textview access that value on runtime.
For image thing, you can do like, you can create custom binding adapter which updates the image. Example:
<androidx.appcompat.widget.AppCompatImageView
android:id="#+id/ivEmailVerification"
loadImageFromUrl="#{viewModel.emailVerifyImageUrl}"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/tvIsEmailValid"
app:layout_constraintWidth_percent="0.7" />
and on BindingAdpater
#BindingAdapter("loadImageFromUrl")
fun ImageView.loadImageFromUrl(imageUrl: String) {
Picasso.get().load(imageUrl).into(this)
}
I want an activity/class to run on a Button click. The Button is inside my RecyclerView. I first had the code in my MainActivity with:
btnComplete.setOnClickListener {
startActivity(Intent(this#MainActivity, DelComplete::class.java))}
This code was in my onCreate of my MainActivity. How ever on running the code I found the error:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
My first thought was that it could not reach the Button since it was in the RecyclerView. So I tried to put the code in my RecyclerView. But I read that it is not a good idea to put it in you RecyclerView and I dont know what to do with the Context as it keeps throwing errors.
RecyclerView:
txtbutton1.setOnClickListener {
confirmdel()
modal.tvdone = "Delivered"
Log.e("Clicked", "Successful delivery")
//this is where I add code to export data through api
modal.state = DataState.Success
Status = 1
notifyDataSetChanged()}
private fun confirmdel() {
startActivity(Intent(this, DelComplete::class.java))}
It might be as simple as filling in the Context but I am unsure what the Context must be to test that theory.
Recyclerview- table_list_item
<?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:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="#+id/txtWOrder"
android:layout_width="160dp"
android:layout_height="match_parent"
android:layout_gravity="top"
android:background="#drawable/table_content_cell_bg"
android:text="#string/worder"
android:textSize="18sp"
tools:ignore="TextContrastCheck" />
<TextView
android:id="#+id/txtDElNote"
android:layout_width="190dp"
android:layout_height="match_parent"
android:layout_gravity="top"
android:background="#drawable/table_content_cell_bg"
android:text="#string/delnote"
android:textSize="18sp"
tools:ignore="TextContrastCheck" />
<TextView
android:id="#+id/txtCompany"
android:layout_width="190dp"
android:layout_height="match_parent"
android:layout_gravity="top"
android:background="#drawable/table_content_cell_bg"
android:text="#string/company"
android:textSize="18sp"
tools:ignore="TextContrastCheck" />
<Button
android:id="#+id/btnComplete"
android:layout_width="250dp"
android:layout_height="match_parent"
android:layout_gravity="top"
android:background="#drawable/table_header_cell_bg"
android:drawableTint="#70D5C8"
android:text="#string/button1"
android:textSize="18sp" />
<Button
android:id="#+id/btnException"
android:layout_width="250dp"
android:layout_height="match_parent"
android:layout_gravity="top"
android:background="#drawable/table_content_cell_bg"
android:text="#string/button2"
android:textSize="18sp" />
<TextView
android:id="#+id/txttvdone"
android:layout_width="50dp"
android:layout_height="match_parent"
android:background="#drawable/table_content_cell_bg"
android:foregroundGravity="center_horizontal"
android:text=""
android:textAlignment="center"
android:textSize="24sp"
android:textStyle="bold" />
<TextView
android:id="#+id/txtWeight"
android:layout_width="190dp"
android:layout_height="match_parent"
android:layout_gravity="top"
android:background="#drawable/table_content_cell_bg"
android:text="#string/weight"
android:textSize="18sp"
tools:ignore="TextContrastCheck" />
</LinearLayout>
The reason why I have a Button in my RecyclerView is on every entry a driver should be able to give feedback on a delivery. Every entry is a different order. Did I go the wrong way of doing this?
My Button does the following:
txtbutton1.setOnClickListener {
confirmdel()
modal.tvdone = "Delivered"
Log.e("Clicked", "Successful delivery")
//this is where I add code to export data through api
modal.state = DataState.Success
Status = 1
notifyDataSetChanged()
}
It does that with no problem. Now however I want to add an AlertDialog and update data in my DB with the setOnClickListener. Will this be possible from within my adapter?
You can use the context like this :
class Adapter(private val context: Context, private val myList: List<String>) :
RecyclerView.Adapter<Adapter.ViewHolder>()
And pass the context where required like this
private fun confirmdel() {
startActivity(Intent(context, DelComplete::class.java))}
You shouldn't put a button inside of your RecyclerView, unless you are referring to a button as the item itself.
RecyclerViews are used to render as much as items as you have in your data source, instead of hardcoding them, so I think you want to handle the click on a single item and navigate to another Activity with the data of that item.
You can do that by following these steps. This is a codelab made by Google and explains how to handle the item click.
In addition, you should do those too, in order to better understanding.RecyclerViews
I have 2 recyclerView, RecyclerView 1, having layoutManager with app:layoutManager="com.google.android.flexbox.FlexboxLayoutManager" & another RecyclerView 2, having app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager".
The first recyclerview item is flickering when scrolling on another recyclerView. It's working fine when item count of RecyclerView 1 is less than 6 or 7.
Please check the video link for the issue reference(0:18s - 0:46s): https://drive.google.com/file/d/17_wa3vd5H7QKh0fgj6Sh310ZNlt2TeG1/view?usp=sharing
Please find the code-snippet below:
activity_personal_activities.xml
<ScrollView
android:id="#+id/scrollView"
android:layout_width="match_parent"
android:layout_height="#dimen/dp_0"
android:fillViewport="true"
app:layout_constraintBottom_toTopOf="#+id/btnSave"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/tvHeaderTitle">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvConditionsSelected"
android:layout_width="#dimen/dp_0"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/dp_12"
android:layout_marginBottom="#dimen/dp_20"
android:orientation="horizontal"
android:paddingStart="#dimen/dp_24"
android:paddingEnd="#dimen/dp_0"
app:layoutManager="com.google.android.flexbox.FlexboxLayoutManager"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_max="#dimen/dp_100"
app:layout_constraintHorizontal_bias="0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:spanCount="2"
tools:itemCount="4"
tools:listitem="#layout/inflate_conditions_selected" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvConditions"
android:layout_width="match_parent"
android:layout_height="#dimen/dp_0"
android:layout_marginTop="#dimen/dp_7"
android:orientation="vertical"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/rvConditionsSelected"
tools:itemCount="5"
tools:listitem="#layout/inflate_conditions" />
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
Setting up adapter:
(bViewDataBinding?.rvConditionsSelected?.itemAnimator as? DefaultItemAnimator)?.supportsChangeAnimations = false
bViewDataBinding?.rvConditionsSelected?.adapter = adapter
ScrollToPosition of RecyclerView 1, On Adding new Item
bViewDataBinding?.rvConditionsSelected?.scrollToPosition(adapterList.size - 1)
I found the root cause of the flicker issue & the Problem was with the first recyclerView height. So I fixed this issue by adding a fixed height initially. If you see in my query, recyclerView height is android:layout_height="#dimen/dp_0" & app:layout_constraintHeight_max="#dimen/dp_100" that is causing the flicker on the FlaxBoxLayoutManager recyclerView.
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvConditionsSelected"
android:layout_width="match_parent"
android:layout_height="#dimen/dp_36"
android:layout_marginTop="#dimen/dp_12"
android:orientation="horizontal"
app:layoutManager="com.google.android.flexbox.FlexboxLayoutManager"
android:paddingStart="#dimen/dp_24"
android:paddingEnd="#dimen/dp_0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/cvSearch"
tools:itemCount="4"
tools:listitem="#layout/inflate_conditions_selected" />
So, I'm changing the height of recyclerView programmatically
override fun updateRecyclerViewHeight() {
val flexSize = (bViewDataBinding?.rvConditionsSelected?.layoutManager as? FlexboxLayoutManager)?.flexLinesInternal?.size
?: return
when (flexSize) {
3 -> changeRecyclerViewHeight(SizeUtils.dp2px(this,100F))
2 -> changeRecyclerViewHeight(SizeUtils.dp2px(this,72F))
1 -> changeRecyclerViewHeight(SizeUtils.dp2px(this,36F))
}
}
override fun changeRecyclerViewHeight(height: Int) {
val params = bViewDataBinding?.rvConditionsSelected?.layoutParams
params?.height = height
bViewDataBinding?.rvConditionsSelected?.layoutParams = params
}
I have a recycle view and I manage to access each item view (for example to set color) by using
recycler_view.findViewHolderForAdapterPosition(position).itemView.setBackgroundColor(R.color.red)
However, I also have a button on each item (secondary action).
<LinearLayout
android:id="#+id/lines_container">
<TextView
android:id="#+id/first_text_view"/>
</LinearLayout>
<ImageView
android:visibility="#{contact.status.active ? View.VISIBLE : View.INVISIBLE}"
app:srcCompat="#drawable/ic_call_black_24dp"
android:clickable="true"
android:id="#+id/secondary_action"/>
How can I access the secondary action button/imageView with the 'position' I have?