PROBLEM - After a note is deleted from second activity, on returning back to first activity(this activity displays notes), changed made to note i.e deleted or edited does not shows change UNLESS the app is restarted and onCreate() method is recalled. If I change my device orientation, then the data gets updated.
How my code works - Basically, my app consists of two activities. First(Main) Activity is where recyclerview resides, this activity handles display of notes by fetching data from SQLite database and displays in form of cardViews. Those cardViews are click able, each cardView when clicked takes to Second(Reference) activity and a corresponding data is loaded into that activity. Now a user has a choice to either make changes to current note or to delete it. If a user clicks on delete button, data of the corresponding note is deleted from SQLite database. On deletion, app automatically goes back to Main activity. HOWEVER, the deleted note does not appears to be deleted in the main activity not until the app is restarted and onCreate method is called.
I have gone through multiple almost similar questions on the site but they do not appear to fit my needs. I am a beginner in Android development so if you could please explain it a little would greatly help me. Thank you.
MAIN ACTIVITY
class MainActivity : AppCompatActivity() {
//START OF EX-INITIALIZATIONS
var dbHandler: PediaDatabase? = null
var adapter: PediaAdapter? = null
var layoutManager: RecyclerView.LayoutManager? = null
var list: ArrayList<UserNotes>? = ArrayList()
var listItems: ArrayList<UserNotes>? = ArrayList()
val PREFS_NAME: String = "MYPREFS"
var myPrefs: SharedPreferences? = null
var first_run: Boolean = true
val REQUEST_CODE: Int = 1
var deletedNoteID: Int = 0
var deletedNoteAdapterPos: Int = 0
//END OF EX-INITIALIZATIONS
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
showOneTimeMessage()
invalidateOptionsMenu()
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
window.navigationBarColor = Color.BLACK
}
//START OF IN-INITIALIZATIONS
dbHandler = PediaDatabase(this)
list = ArrayList<UserNotes>()
listItems = ArrayList()
adapter = PediaAdapter(this, listItems!!)
layoutManager = LinearLayoutManager(this)
recyclerViewID.adapter = adapter
recyclerViewID.layoutManager = layoutManager
//END OF IN-INITIALIZATIONS
//DATA POPULATION STARTS HERE
list = dbHandler!!.readAllNotes()
for(reader in list!!.iterator())
{
var note = UserNotes()
note.noteTitle = reader.noteTitle
note.noteText = reader.noteText
note.noteID = reader.noteID
note.noteDate = reader.noteDate
listItems!!.add(note)
}
adapter!!.notifyDataSetChanged()
//DATA POPULATION ENDS HERE
if(dbHandler!!.totalNotes() == 0) {
recyclerViewID.visibility = View.GONE
}
else{
recyclerViewID.visibility = View.VISIBLE
showWhenEmptyID.visibility = View.GONE
}
}//end onCreate
override fun onRestart() {
super.onRestart()
overridePendingTransition(R.anim.slide_out, R.anim.slide_in)
}
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
menuInflater.inflate(R.menu.top_menu, menu)
val item = menu!!.findItem(R.id.delete_note_menu)
item.setVisible(false)
return true
//return super.onCreateOptionsMenu(menu)
}
override fun onOptionsItemSelected(item: MenuItem?): Boolean {
if(item!!.itemId == R.id.add_note_menu){
var isNewNote = Intent(this, ReferenceActivity::class.java)
isNewNote.putExtra("isNewNote", true)
startActivityForResult(isNewNote, REQUEST_CODE)
}
if(item!!.itemId == R.id.delete_note_menu)
{
Toast.makeText(this,"DELETED", Toast.LENGTH_SHORT).show()
}
return super.onOptionsItemSelected(item)
}
private fun showOneTimeMessage()
{
var data: SharedPreferences = getSharedPreferences(PREFS_NAME, 0)
if(data.contains("isShown"))
{
first_run = data.getBoolean("isShown", true)
}
Log.d("FIRST_RUN", first_run.toString())
if(first_run) {
val oneTimeMsg = SweetAlertDialog(this)
oneTimeMsg.setTitleText("Hey there!")
oneTimeMsg.setContentText("Thank you for downloading! Please don`t forget to rate our app :)").show()
oneTimeMsg.setConfirmClickListener(object : SweetAlertDialog.OnSweetClickListener {
override fun onClick(sweetAlertDialog: SweetAlertDialog?) {
oneTimeMsg.dismissWithAnimation()
}
}).show()
myPrefs = getSharedPreferences(PREFS_NAME, 0)
var editor: SharedPreferences.Editor = (myPrefs as SharedPreferences).edit()
editor.putBoolean("isShown", false)
editor.commit()
}
}
REFERENCE ACTVITY
class ReferenceActivity : AppCompatActivity() {
var dbHandler: PediaDatabase? = null
var note = UserNotes()
var existingNote = UserNotes()
var noteExisted: Boolean = false
var cardID: Int = 0
var cardAdapterPos: Int? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_reference)
getSupportActionBar()!!.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
getSupportActionBar()!!.setCustomView(R.layout.custom_toolbar);
val dateTxtView = findViewById<View>(resources.getIdentifier("action_bar_title", "id", packageName)) as TextView
overridePendingTransition(R.anim.slide_in, R.anim.slide_out);
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
window.navigationBarColor = Color.RED
dbHandler = PediaDatabase(this)
var data = intent
var isNewNote = intent
if(isNewNote != null)
if(isNewNote.extras.getBoolean("isNewNote") != true)
{
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN)
if(data != null)
{
noteExisted = true
this.cardAdapterPos = data.extras.getInt("cardPosition")
cardID = data.extras.getInt("cardID")
existingNote = dbHandler!!.readNote(cardID)
refTitleID.setText(existingNote.noteTitle, TextView.BufferType.EDITABLE)
refTextID.setText(existingNote.noteText, TextView.BufferType.EDITABLE)
dateTxtView.text = existingNote.noteDate.toString()
}
}else{
dateTxtView.text = "New note"
}
}//end onCreate()
override fun onStop() {
super.onStop()
var title: String = refTitleID.text.toString().trim()
var text: String = refTextID.text.toString().trim()
if(existingNote.noteText == text && existingNote.noteTitle == title)
finish()
if(noteExisted)
{
if(TextUtils.isEmpty(title))
title = "No title"
existingNote.noteTitle = title
existingNote.noteText = text
//existingNote.noteDate =
dbHandler!!.updateNote(existingNote)
var dataToMain = this.intent
dataToMain.putExtra("cardID", cardID)
dataToMain.putExtra("cardAdapterPos", cardAdapterPos)
setResult(Activity.RESULT_OK, dataToMain)
finish()
}
else
{
if(TextUtils.isEmpty(title) && TextUtils.isEmpty(text))
{
finish()
}
else
{
if(TextUtils.isEmpty(title))
title = "No title"
note.noteTitle = title
note.noteText = text
dbHandler!!.createNote(note)
finish()
}
}
}
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
menuInflater.inflate(R.menu.top_menu, menu)
val addItem: MenuItem = menu!!.findItem(R.id.add_note_menu)
val delItem:MenuItem = menu.findItem(R.id.delete_note_menu)
addItem.setVisible(false)
delItem.setVisible(false)
if(noteExisted)
delItem.setVisible(true)
return true
//return super.onCreateOptionsMenu(menu)
}
override fun onOptionsItemSelected(item: MenuItem?): Boolean {
if(item!!.itemId == R.id.delete_note_menu)
{
val dialogMsg = SweetAlertDialog(this, SweetAlertDialog.WARNING_TYPE)
dialogMsg.setTitleText("Are you sure?")
dialogMsg.setContentText("You won`t be able to recover this note!")
dialogMsg.setConfirmText("Yes,delete it!")
dialogMsg.setConfirmClickListener(object: SweetAlertDialog.OnSweetClickListener {
override fun onClick(sweetAlertDialog: SweetAlertDialog?) {
dialogMsg.dismissWithAnimation()
dbHandler!!.deleteNote(cardID)
var successMsg = SweetAlertDialog(sweetAlertDialog!!.context, SweetAlertDialog.SUCCESS_TYPE)
successMsg.setTitleText("Note deleted!")
successMsg.setContentText("So long,note").show()
successMsg.setCancelable(false)
//TODO Disable 'OK' button on successMsg dialogbox
Handler().postDelayed({
successMsg.dismissWithAnimation()
finish()
}, 1200)
}
}).show()
}
return super.onOptionsItemSelected(item)
}
}
