I try to create a recyclerview for my gallery photo and video, I'm sur the data is correctly collected, an adapter is created and attached to my recycler view before the error.
I created the recyclerview as follow :
fileList = FileUtils.filesInGaleryFolder
itemAdapter = GalerieAdapter(this, fileList)
galeriebind.recyclerGallery.layoutManager = GridLayoutManager(this, 3)
galeriebind.recyclerGallery.adapter = itemAdapter
Here is my adapter class:
class GalerieAdapter(ctx: Activity, items: List<File>) : RecyclerView.Adapter<GalerieAdapter.ViewHolder>() {
//--- VARIABLES -----//
var ctx: Context = ctx
var items: List<File> = items
var esVideo = false
/*****
* This method is called right when the adapter is created and is used to initialize your ViewHolder(s).
*****/
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.gallery_item, parent, false)
return ViewHolder(view)
}
Below you will also find my xml for the activity and the adapter:
<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView
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:fillViewport="true"
tools:context=".Galerie">
<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:background="@drawable/bg_home"
tools:context=".Galerie">
<ImageView
android:id="@+id/imageTitle"
android:layout_width="230dp"
android:layout_height="24dp"
android:layout_marginStart="24dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/logo_home" />
<View
android:id="@+id/view"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginTop="15dp"
android:background="@color/detailsgrey"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageTitle" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_gallery"
app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginStart="24dp"
android:layout_marginEnd="24dp"
android:layout_marginTop="55dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="@+id/view"
app:layout_constraintStart_toStartOf="@+id/view"
app:layout_constraintTop_toBottomOf="@+id/view" />
<ImageButton
android:id="@+id/backbutton"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_marginStart="24dp"
android:layout_marginTop="5dp"
android:background="@color/transparent"
android:padding="6dp"
android:scaleType="fitXY"
android:src="@drawable/ic_arrow_left"
android:onClick="onClick"
app:layout_constraintBottom_toBottomOf="@+id/imageTitle"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/imageTitle" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
and the one for the adapter:
<?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/container"
android:layout_width="178dp"
android:layout_height="120dp"
android:layout_marginTop="10dp"
android:background="@drawable/bt_galery_item_selector">
<TextView
android:id="@+id/date"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginEnd="16dp"
android:fontFamily="@font/nunito_bold"
android:textColor="@color/BLACK"
app:layout_constraintBottom_toTopOf="@+id/hour"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.505"
app:layout_constraintStart_toStartOf="parent"
tools:text="12/12/2019" />
<TextView
android:id="@+id/hour"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="24dp"
android:textSize="12sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.505"
app:layout_constraintStart_toStartOf="parent"
tools:text="20:45:03" />
<View
android:id="@+id/bg_categoria"
android:layout_width="0dp"
android:layout_height="24dp"
android:layout_marginStart="20dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="48dp"
android:background="@drawable/rounded_shape"
android:backgroundTint="@color/greenbutton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/categoria"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginEnd="20dp"
android:fontFamily="@font/nunito_bold"
android:gravity="start|right|left|end"
android:textColor="@color/WHITE"
android:textSize="12sp"
app:layout_constraintBottom_toBottomOf="@+id/bg_categoria"
app:layout_constraintEnd_toEndOf="@+id/bg_categoria"
app:layout_constraintStart_toEndOf="@+id/imgCategoria"
app:layout_constraintTop_toTopOf="@+id/bg_categoria"
tools:text="VIDEO" />
<ImageView
android:id="@+id/imgCategoria"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_marginStart="10dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
app:layout_constraintBottom_toBottomOf="@+id/bg_categoria"
app:layout_constraintStart_toStartOf="@+id/bg_categoria"
app:layout_constraintTop_toTopOf="@+id/bg_categoria"
app:srcCompat="@drawable/ic_video_label" />
</androidx.constraintlayout.widget.ConstraintLayout>
I saw that the problem can be related to the lack of grid layout, but I initialized one and passed it to the recyclerview, and I still get the error "No adapter attached; skipping layout" and no item are displayed. I also found it can be related to asynchronous call, but i don't think there is any asynchronous in my case as it's in the OnCreate(). and event with the notifyDataSetChanged() but it doesn't solve the problem.
I also try to initialize the adapter first then init data as following:
itemAdapter = GalerieAdapter(this, fileList)
galeriebind.recyclerGallery.adapter = itemAdapter
fileList = FileUtils.filesInGaleryFolder
itemAdapter!!.setFiles(fileList)
I checked the data in galeriebind.recyclerGallery.adapter is correctly updated and i call the notifyDataSetChanged() in the setFiles() method
I finally found out the answer, the problem is coming from my binding, I just replaced :
itemAdapter = GalerieAdapter(this, fileList)
galeriebind.recyclerGallery.adapter = itemAdapter
fileList = FileUtils.filesInGaleryFolder
itemAdapter!!.setFiles(fileList)
by:
itemAdapter = GalerieAdapter(Activity(), fileList)
var recyclerview = findViewById<RecyclerView>(R.id.recycler_gallery)
recyclerview.adapter = itemAdapter
fileList = FileUtils.filesInGaleryFolder
itemAdapter.setFiles(fileList)
val glm = GridLayoutManager(this, 3)
glm.orientation = GridLayoutManager.HORIZONTAL
recyclerview.layoutManager = glm
Using the findviewbyID solved it