I'm trying to use Picasso to get images from Url and put inside an Adapter. I have to send the image as a parameter to the funcion imageSlider inside the my SliderViewHolder. Can someone explain me how?
Picasso get:
Picasso.get()
.load(sliderImages[position])
.transform( RoundedTransformation(30, 0))
.placeholder(context.resources.getDrawable(R.drawable.ic_launcher_foreground))//it will show placeholder image when url is not valid.
.networkPolicy(NetworkPolicy.OFFLINE) //for caching the image url in case phone is offline
.into(holder.imageSlider(?))
Viewholder:
class SliderViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val imageView: RoundedImageView = itemView.findViewById(R.id.image_slide)
fun imageSlider(sliderItem: SliderItem) {
imageView.setImageResource(sliderItem.image)
}
}
The Function
fun imageSlider(sliderItem: SliderItem) {
imageView.setImageResource(sliderItem.image)
}
is not necessary, because you declare the imageView with a public visibility.
In the Adapter of your RecyclerView, there is a Method called
override fun onBindViewHolder(holder: SliderViewHolder, position: Int)
This one will get invoked, when the Adapter wants to bind your Item Layout (ViewHolder) with a "backing data item" of the List...
Then you could simply do this:
Picasso.get()
.load(sliderImages[position])
.transform( RoundedTransformation(30, 0))
.placeholder(context.resources.getDrawable(R.drawable.ic_launcher_foreground))//it will show placeholder image when url is not valid.
.networkPolicy(NetworkPolicy.OFFLINE) //for caching the image url in case phone is offline
.into(holder.imageView)
Which will make Picasso, load the Image into the ImageView of your ViewHolder (which actually simply holds the Item Layout) for the current Item in the List.
The correct implementation would actually be, that you give your Adapter a List of Image Objects (for example, containing Properties like Image Name and a Path/URL, that should get "rendered") and when the Adapter is invoking "onBindViewHolder" with the corresponding Position, it is your Job to implement the loading of the image from the given path for the given position.
Related
i get list of image and text data from api in first fragment then when user pick image it's go to second fragment and show image and textfirst-fragment
github.com/AzAlhobayyeb/Images.git
i tried to link fragments with live data didn't use argumentssecond-fragment
it's like the imagePicked in the 2nd Fragment is null.I think the reason the viewModel is recreated in 2nd page.
Solution :
In the ImageDetailsFragment you using :
private val viewModel: ImageViewModel by viewModels()
change to this :
private val viewModel: ImageViewModel by activityViewModels()
i want change the ImageResource of a ImageButton that i have find by id.
Motivation
a ImageButton(bottom) works as a reminder/backup of the last click of a ImageButton(top) .
setup:
some ImageButton (at the top of the app).
a ImageButton (at the bottom of the app).
example without errors, but don't find ImageResource of idR1
findViewById<ImageButton>(idR1).setOnClickListener {
findViewById<ImageButton>(idR5_oppCiv).setImageResource(R.drawable.athen_cavalry_swordsman);
not working examples
findViewById<ImageButton>(idR1).setOnClickListener {
findViewById<ImageButton>(idR5_oppCiv).setImageResource(it.resources.getDrawable());
findViewById<ImageButton>(idR1).setOnClickListener {
findViewById<ImageButton>(idR5_oppCiv).setImageResource(it.getImageResource());
try to get and set Drawable
following causes the app to crash when i click on an ImageButton.
Here i use a defType "res" to get the resource (the image hopefully).
val resR1: Int = resources.getIdentifier("r1col$i", "res", this.packageName)
findViewById<ImageButton>(idR1).setOnClickListener {
findViewById<ImageButton>(idR5_oppCiv).setImageDrawable(getDrawable(resR1))
How could i get this image resource of it ? And use it for the other ImageButton?
You should be setting the image like using setImageDrawable like this.
val image = findViewById<ImageButton>(R.id.your_view_id)
image.setOnClickListener {
findViewById<ImageButton>(idR5_oppCiv).setImageDrawable(image.drawable)
}
I trying use Room to inflate the Database in an RecyclerView, but all this using Fragments. I have the screen where the user enters the data and the screen where the RecyclerView is inflated, but I don't know how to make the Room data inflate in the RecyclerView and I still can't understand the viewModel.
For Getting data from Room this might get helpful
and for view modal this helped me.
after getting data from Room you can simply notify the adapter.
example :
var myList = ArrayList<YourModel>()
roomDataList.forEach { item ->
//You can parse or convert your data according to your use
myList.add(item)
}
adapter.updateList(myList)
I wanted to change font family of items on a recycler view every time I click a button.
So I coded like below.
rbAritaBuri = view.findViewById(R.id.rb_aritaBuri)
rbCafe24 = view.findViewById(R.id.rb_cafe24SurroundAir)
rbAritaBuri.setOnClickListener {
rv_work_preview.tv_work_content.typeface = Typeface.createFromAsset(requireActivity().assets, "fonts/arita_buri.otf")
}
rbCafe24.setOnClickListener {
rv_work_preview.tv_work_content.typeface = Typeface.createFromAsset(requireActivity().assets, "fonts/cafe24_surround_air.ttf")
}
But it changes only the font family of the first item of the recycler view.
Is there a way to change fonts of them all together runtime? And please tell me why the code I wrote doesn't work right.
Thank you.
If I were in your position, I would:
Put your font changing calls inside of onBindViewHolder(). If you have to, you could put a bool in there like buttonClicked and link its value to your buttons.
Come up with a good way to force a call to onBindViewHolder(). Sometimes notifyDataSetChanged() is enough. But in some cases, you might have to remove the adapter by setting it to null and then reset the adapter to its original value.
Place that logic from step 2 inside of your buttons' onClick()s.
Edit:
What I mean is, create a var inside the class with the most exterior scope, so outside of oncreate().
var textChoice=""
Now use your buttons to change that var.
rbAritaBuri.setOnClickListener {
textChoice="fonts/arita_buri.otf"
}
Now inside your onBindViewHolder(), make the font switch.
when (fontChoice){
"fonts/arita_buri.otf"->{ rv_work_preview.tv_work_content.typeface = Typeface.createFromAsset(requireActivity().assets, "fonts/arita_buri.otf")}
//and so on and so forth for all of your fonts
Now when you want to show the change, call notifyDatasetChanged(). I think maybe the best place to do that would be inside of your buttons. So maybe you'd actually have:
rbAritaBuri.setOnClickListener {
textChoice="fonts/arita_buri.otf"
<The name of your recyclerview adapter>.notifyDatasetChanged()
}
Here is how I solved it, thanks to D. Kupra:
class SampleWorkAdapter(private val context: Context) :
RecyclerView.Adapter<SampleWorkAdapter.ViewHolder>() {
var selectedFont = EditTextActivity.HAMBAK_SNOW
First, I assigned the default font Hambak_snow to selectedFont, type String.
inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
...
fun changeFont(font: String) {
CustomFontHelper.setCustomFont(content, font, itemView.context)
} ...
}
Then I wrote a function to be called on onBindViewHolder to change font-family of textview, using custom typeface. https://stackoverflow.com/a/16648457/15096801 This post helped a lot.
override fun onBindViewHolder(viewHolder: ViewHolder, position: Int) {
...
viewHolder.changeFont(selectedFont)
...
}
Now, replaceFont will be called when the variable selectedFont get changed and adapter.notifyDatasetChanged() is called on an activity, like this:
rbMapoFlowerIsland.setOnClickListener {
sampleWorkAdapter.selectedFont = EditTextActivity.MAPO_FLOWER
sampleWorkAdapter.notifyDataSetChanged()
}
I use Fresco to load gif in a Recyclerview.
Here is my kotlin code:
fun loadResizeImage(uri: Uri, view: SimpleDraweeView, width: Int, height: Int) {
val request = ImageRequestBuilder.newBuilderWithSource(uri)
.setResizeOptions(ResizeOptions(width, height)).build()
val controller = Fresco.newDraweeControllerBuilder()
.setOldController(view.controller)
.setImageRequest(request)
.build()
view.controller = controller
I don't play the gif, I just load it as a static image. But when I invoke notifydatasetchanged, the gif blinks.
I have set the supportsChangeAnimations to false, and only the gif is blinking. Can anyone help me?
My solution is to set tag to the view, if the tag equals to the uri i won't reload the image. But I find when i invoke notifyDataSetChange, the tag i set to the view is changed.but when I invoke notifyItemChanged,it doesn't.I have no idea why the tag changed(i didn't scroll the RecyclerView).