Step.02-Solution-Display-Data

app/src/main/java/com/example/android/trackmysleepquality/sleeptracker/SleepNightAdapter.kt

@@ -16,15 +16,21 @@
 
 package com.example.android.trackmysleepquality.sleeptracker
 
+import android.view.LayoutInflater
 import android.view.ViewGroup
+import android.widget.TextView
 import androidx.recyclerview.widget.RecyclerView
+import com.example.android.trackmysleepquality.R
 import com.example.android.trackmysleepquality.TextItemViewHolder
 import com.example.android.trackmysleepquality.database.SleepNight
 
-class SleepNightAdapter: RecyclerView.Adapter<TextItemViewHolder>() {
+class SleepNightAdapter : RecyclerView.Adapter<TextItemViewHolder>() {
 
- // TODO (03) Add a custom setter to data that calls notifyDataSetChanged().
- var data = listOf<SleepNight>()
+ var data = listOf<SleepNight>()
+ set(value) {
+ field = value
+ notifyDataSetChanged()
+ }
 
  override fun getItemCount() = data.size
 
@@ -35,10 +41,10 @@ class SleepNightAdapter: RecyclerView.Adapter<TextItemViewHolder>() {
 
  override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TextItemViewHolder {
 
- // TODO (01) Inflate the text_item_view layout.
+ val layoutInflater = LayoutInflater.from(parent.context)
+ val view = layoutInflater
+ .inflate(R.layout.text_item_view, parent, false) as TextView
 
- // TODO (02) Return the inflated view.
-
- TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+ return TextItemViewHolder(view)
  }
 }

app/src/main/java/com/example/android/trackmysleepquality/sleeptracker/SleepTrackerFragment.kt

@@ -97,11 +97,14 @@ class SleepTrackerFragment : Fragment() {
  }
  })
 
- // TODO (04) Create a new SleepNightAdapter variable,
- // and bind it to the RecyclerView’s Adapter.
+ val adapter = SleepNightAdapter()
+ binding.sleepList.adapter = adapter
 
- // TODO (05) Create an observer on sleepTrackerViewModel.nights that tells
- // the Adapter when there is new data.
+ sleepTrackerViewModel.nights.observe(viewLifecycleOwner, Observer {
+ it?.let {
+ adapter.data = it
+ }
+ })
 
  return binding.root
  }