kotlin.TypeCastException: null cannot be cast to non-null type com.midsizemango.databasekotlin.Note
I am trying to code my app in Kotlin, but I am getting null cannot be casted to non-null type and app force stops when I open EditNoteActivity
at EXTRA_NOTE
probably.
Any Help is Highly Appreciated
Code:
class EditNoteActivity : AppCompatActivity() {
var note: Note? = null
private val editNote: TextView? = null
private val fabdrwble: Boolean? = null
private val notesData: MutableList<Note>? = null
private var databaseHelper: DatabaseHelper? = null
private val save: Boolean? = null
private var saveButton: FloatingActionButton? = null
private val tint: ColorStateList? = null
internal var mRowId: Long? = null
internal var spinner: Spinner? = null
internal var spinnertext: String? = null
internal var fav: Int = 0
internal var mSharedFromIntentFilter = false
internal var editTitle: EditText? = null
internal var editContent: EditText? = null
internal var inputlayoutTitle: TextInputLayout? = null
internal var inputlayoutContent: TextInputLayout? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_edit_note)
var toolbar = findViewById(R.id.toolbar_edit) as Toolbar?
setSupportActionBar(toolbar)
if (supportActionBar != null)
supportActionBar!!.setDisplayHomeAsUpEnabled(true)
databaseHelper = DatabaseHelper(applicationContext)
inputlayoutTitle = findViewById(R.id.inputlayoutTitle) as TextInputLayout?
inputlayoutContent = findViewById(R.id.inputlayoutContent) as TextInputLayout?
editTitle = findViewById(R.id.note_title) as EditText
editContent = findViewById(R.id.note_content) as EditText?
val bundle = intent.extras
val s = bundle.getString("edit")
if (s == "add") {
window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE)
} else if (s == "editv") {
window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN)
}
note = intent.getSerializableExtra(EXTRA_NOTE) as Note
if (note != null) {
editTitle?.setText(note!!.getTitle())
editContent?.setText(note!!.getContent())
} else {
note = Note()
//note.setUpdatedAt(new Date());
}
saveButton = findViewById(R.id.add_edit_button) as FloatingActionButton?
saveButton!!.setOnClickListener {
if (isNoteFormOk) {
setNoteResult()
finish()
} else
validateNoteForm()
}
var ll = findViewById(R.id.llmain) as LinearLayout?
var ll1 = findViewById(R.id.ll1) as LinearLayout?
/*if(note.getColor() == Color.TRANSPARENT){
selectedColor = preselect;
}else {
selectedColor = note.getColor();
}
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
systemBarTintManager = new SystemBarTintManager(this);
systemBarTintManager.setStatusBarTintEnabled(true);
ll.setBackgroundColor(selectedColor);
ll1.setBackgroundColor(selectedColor);
toolbar.setBackgroundColor(note.getColor());
systemBarTintManager.setStatusBarTintColor(selectedColor);*/
}
override fun onResume() {
super.onResume()
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item.itemId) {
android.R.id.home -> {
onBack()
return true
}
/*
case R.id.speech:
try {
displaySpeechRecognizer();
} catch (ActivityNotFoundException e) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://market.android.com/details?id=com.google.android.googlequicksearchbox"));
startActivity(browserIntent);
}
return true;*/
else -> return super.onOptionsItemSelected(item)
}
}
private fun displaySpeechRecognizer() {
val intent = Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH)
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM)
startActivityForResult(intent, SPEECH_REQUEST_CODE)
}
override fun onActivityResult(requestCode: Int, resultCode: Int,
data: Intent) {
if (requestCode == SPEECH_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
val results = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS)
val spokenText = results[0]
editContent?.setText(spokenText)
}
if (requestCode == RequestResultCode.REQUEST_CODE_ADD_NOTE) {
if (resultCode == Activity.RESULT_OK) {
addNote(data)
}
}
}
private val isNoteFormOk: Boolean
get() {
val title = editTitle?.text.toString()
return !(title == null || title.trim { it <= ' ' }.length == 0)
}
private fun validateNoteForm() {
var msg: String? = null
if (isNullOrBlank(editTitle?.text.toString())) {
msg = "Title Required"
inputlayoutTitle?.error = "Title is Missing"
}
if (msg != null) {
Toast.makeText(applicationContext, msg, Toast.LENGTH_LONG).show()
}
}
private fun setNoteResult() {
note!!.setTitle(editTitle?.text.toString().trim { it <= ' ' })
note!!.setContent(editContent?.text.toString().trim { it <= ' ' })
//note.setUpdatedAt(new Date());
val intent = Intent()
intent.putExtra(EXTRA_NOTE, note)
setResult(Activity.RESULT_OK, intent)
//addNote(intent);
Toast.makeText(this@EditNoteActivity, "Note Saved.", Toast.LENGTH_LONG).show()
}
private fun onBack() {
if (isNoteFormOk) {
if (editTitle?.text.toString() == note!!.getTitle() && editContent?.text.toString() == note!!.getContent()) {
setResult(Activity.RESULT_CANCELED, Intent())
finish()
} else {
AlertDialog.Builder(this@EditNoteActivity)
.setTitle("Save")
.setMessage("Do You Want to Save Note")
.setPositiveButton("SAVE") { dialog, which ->
setNoteResult()
finish()
}.setNegativeButton("CANCEL") { dialog, which ->
setResult(Activity.RESULT_CANCELED, Intent())
finish()
}.show()
}
} else {
setResult(Activity.RESULT_CANCELED, Intent())
finish()
}
}
private fun addNote(data: Intent) {
val note = data.getSerializableExtra(EXTRA_NOTE) as Note
val noteId = databaseHelper!!.createNote(note)
note.setId(noteId)
}
override fun onBackPressed() {
onBack()
val intentHome = Intent(this@EditNoteActivity, MainActivity::class.java)
intentHome.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP
intentHome.putExtra(EXTRA_NOTE, note)
setResult(Activity.RESULT_OK, intentHome)
}
companion object {
private val EXTRA_NOTE = "EXTRA_NOTE"
private val SPEECH_REQUEST_CODE = 0
fun isNullOrBlank(str: String?): Boolean {
return str == null || str.trim { it <= ' ' }.length == 0
}
}
}
Logs:
java.lang.RuntimeException: Unable to start activity ComponentInfo{ com.midsizemango.databasekotlin/com.midsizemango.databasekotlin.EditNoteActivity}: kotlin.TypeCastException: null cannot be cast to non-null type com.midsizemango.databasekotlin.Note at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) at android.app.ActivityThread.access$800(ActivityThread.java:144) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5221) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) Caused by: kotlin.TypeCastException: null cannot be cast to non-null type com.midsizemango.databasekotlin.Note at com.midsizemango.databasekotlin.EditNoteActivity.onCreate(EditNoteActivity.kt:82) at android.app.Activity.performCreate(Activity.java:5933) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) at android.app.ActivityThread.access$800(ActivityThread.java:144) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5221) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:694)
Solution 1:
In this line:
note = intent.getSerializableExtra(EXTRA_NOTE) as Note
Note
is a non-null type, so the cast to it triggers a null check. Since you're comparing note
to null
manually afterwards, probably you meant the safe cast operator, which yields null
if the expression is not of the type specified in the right-hand side:
note = intent.getSerializableExtra(EXTRA_NOTE) as? Note