NoteDetailActivity.kt

package com.shellmonger.apps.mynotes.ui

import android.arch.lifecycle.Observer
import android.arch.lifecycle.ViewModelProviders
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import com.shellmonger.apps.mynotes.R
import com.shellmonger.apps.mynotes.extensions.set
import com.shellmonger.apps.mynotes.models.Note
import com.shellmonger.apps.mynotes.viewmodels.NoteDetailViewModel
import kotlinx.android.synthetic.main.activity_note_detail.*

class NoteDetailActivity : AppCompatActivity() {
    companion object {
        private val TAG = this::class.java.simpleName
    }

    private lateinit var viewModel: NoteDetailViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_note_detail)
        viewModel = ViewModelProviders.of(this).get(NoteDetailViewModel::class.java)

        // Set the note that we want to edit
        viewModel.setNoteId("temp-note")

        // Observe the viewModel for changes to the note
        viewModel.currentNote.observe(this, Observer {
            Log.d(TAG,"Loading note via observer")
            it?.let {
                detail_id_field.text = it.noteId
                detail_title_editor.text.set(it.title)
                detail_content_editor.text.set(it.content)
            }
        })
    }

    override fun onPause() {
        super.onPause()
        saveNote()
    }

    private fun saveNote() {
        Log.d(TAG, "Note is being saved")
        with (viewModel.currentNote.value!!) {
            val note = Note(noteId).apply {
                title = detail_title_editor.text.toString()
                content = detail_content_editor.text.toString()
            }
            viewModel.saveNote(note)
        }
    }
}