How do I take data from a firebase database and show it in a recycler view? - kotlin

Question

Im trying to get data from a firebase database collection and show it in a recycler view.
My collection is called savedDailyPlan. I am super new to kotlin and to android studio and I'm having a hard time finding the solution to this problem.
This is my data class:
data class DoneExercise(
var exerciseName : String = "",
var weight : Int = 0,
var sets : Int = 0,
var reps : Int = 0,
var date : Timestamp = Timestamp.now()
)
This is my adapter:
class DailyWorkoutAdapter(private val items: List<DoneExercise>) : RecyclerView.Adapter<DailyWorkoutAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.plan_list_item, parent, false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val item = items[position]
holder.property1.text = item.exerciseName
holder.property2.text = item.weight.toString()
//holder.property3.text = item.sets.toString()
//holder.property4.text = item.reps.toString()
}
override fun getItemCount(): Int = items.size
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val property1: TextView = itemView.findViewById(R.id.tv_day_name)
val property2: TextView = itemView.findViewById(R.id.tv_exercise_name)
//val property3: TextView = itemView.findViewById(R.id.property3)
//val property4: TextView = itemView.findViewById(R.id.property4)
}
}
I tried this but nothing shows up after i press the Positive Button:
private fun showPlanDialog() {
val db = FirebaseFirestore.getInstance()
val collectionRef = db.collection("savedDailyPlan")
val showDailyWorkoutHelper = LayoutInflater.from(context).inflate(R.layout.show_daily_exercises, null)
val dialogHelperDaily= ShowDailyWorkoutHelper(showDailyWorkoutHelper)
AlertDialog.Builder(context)
.setView(showDailyWorkoutHelper)
.setTitle("Generate plan")
.setPositiveButton("Choose day") {_, _ ->
recyclerView.layoutManager = LinearLayoutManager(context)
val dailyWorkoutsList: MutableList<DoneExercise> = arrayListOf()
val dailyWorkoutAdapter = DailyWorkoutAdapter(dailyWorkoutsList)
recyclerView.adapter = dailyWorkoutAdapter
}.show()
}
The Choose day part is something im planning on adding later, where I'd want to get only specific data from the collection (exercises that were created only for a certain date).