Ok from the Start, I have a RecyclerView where I want to change the color of the entries, if they are clicked.
The Recyclerview gets a list from a database, where I added a bool value, if the View is selected.
In my holder I check if the view is selected and change the color with a selector.
So far so good, but now there is the problem.
The Activity Starts, the old selected Entry is colored, but when I click on an other Entry the color of the old entry disappears and on the one tapped nothing happens. I have to reclick on the old entry again and from this point the color changing works fine.
method called in viewHolder
itemView.view_foreground_nav.isSelected = (table.isSelected)
selector
<selector
xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:drawable="@android:color/darker_gray"
android:state_pressed="true"/>
<item
android:drawable="@android:color/darker_gray"
android:state_selected="true"/>
<item
android:drawable="@android:color/darker_gray"
android:state_focused="true"/>
<item android:drawable="@android:color/white"/>
</selector>
RelativeLayout from viewholder where color should changed
android:id="@+id/view_foreground_nav"
android:layout_width="match_parent"
android:layout_height="@dimen/ic_delete"
android:background="@drawable/recycler_nav_item_background">
variable in the Activity which is set in onCreate
private var selectedTable: Table? = null
onClick Method
if (selectedTable != null) {
var oldSelectedTable = selectedTable
oldSelectedTable?.isSelected = false
productViewModel.updateTable(oldSelectedTable!!)
data.isSelected = true
productViewModel.updateTable(data)
selectedTable = data
} else {
data.isSelected = true
productViewModel.updateTable(data)
selectedTable = data
}
button_add_note.isEnabled = true
observerProduct(selectedTable)
Diffutil
override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int):Boolean{
return oldListTable[oldItemPosition].idTable == newListTable[newItemPosition].idTable
}
override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
return oldListTable[oldItemPosition].title == newListTable[newItemPosition].title&&
oldListTable[oldItemPosition].isSelected == newListTable[newItemPosition].isSelected
}
The ProductViewModel is a lateinit in the MainActivity
private lateinit var productViewModel: ProductViewModel
In OnCreate I set the ViewModel
productViewModel =
ViewModelProviders.of(this).get(ProductViewModel::class.java)
GenericAdapter Call
private fun observerTable() {
productViewModel.getAllTables().observe(this, Observer<List<Table>> { it ->
adapterNav.setItems(it as MutableList<Any>)
})
}
Table Dao
@Query("Select * from main_table")
fun getAllTables(): LiveData<MutableList<Table>>
ProductRepro
private var tableDao: TableDao
private var allTables: LiveData<MutableList<Table>>
init {
var database: ProductDatabase? = ListMasterApplication.database
this.tableDao = database!!.tableDao()
this.allTables = tableDao.getAllTables()
}
var database: ProductDatabase? = ListMasterApplication.database
fun getAllTable(): LiveData<MutableList<Table>> {
return allTables
}
ProductVieModel
private var productRepository: ProductRepository = ProductRepository()
private var liveDataTable: LiveData<MutableList<Table>>
init {
this.liveDataTable = productRepository.getAllTable()
}
fun getAllTables():LiveData<MutableList<Table>>{
return liveDataTable
}
Observer in MainActivity
private fun observerTable() {
productViewModel.getAllTables().observe(this, Observer<MutableList<Table>> { it ->
adapterNav.setItems(it as MutableList<Any>)
})
}
In GenericAdapter set Items
fun setItems(items: MutableList<T>) {
val diffCallback = DiffCallback(listItems ,items)
val diffResult = DiffUtil.calculateDiff(diffCallback)
listItems.clear()
listItems.addAll(items)
diffResult.dispatchUpdatesTo(this)
}
I logged my Diffutil and on each click on different items the Log was always correct. I logged the selected table variable an it is always correct.
I don't know where to go from this point. It only happens in the start of the activity and then it works fine. Do you have some hints or something, which i could try. If you need some more insight of the code, let me know and I publish more.
