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kotlin.TypeCastException: la valeur null ne peut pas être convertie en un type non null com.midsizemango.databasekotlin.Note

J'essaie de coder mon application dans Kotlin, mais j'obtiens une valeur null qui ne peut pas être convertie en un type non nul et l'application s'arrête lorsque j'ouvre EditNoteActivity à EXTRA_NOTE probablement.

Toute aide est grandement appréciée

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
    }
}
}

Journaux:

Java.lang.RuntimeException: Impossible de démarrer l'activité ComponentInfo {com.midsizemango.databasekotlin/com.midsizemango.databasekotlin.EditNoteActivity}: kotlin.TypeCastException: la valeur null ne peut pas être convertie en type non nul com.midsizemango.databasek.Note à Android. app.ActivityThread.performLaunchActivity (ActivityThread.Java:2298) à Android.app.ActivityThread.handleLaunchActivity (ActivityThread.Java:2360) à Android.app.ActivityThread.access $ 800 (ActivityThread.Java:144) à Android.app.ActivityThread $ H.handleMessage (ActivityThread.Java:1278) sur Android.os.Handler.dispatchMessage (Handler.Java:102) sur Android.os.Looper.loop (Looper.Java:135) sur Android.app.ActivityThread.main (ActivityThread .Java: 5221) à Java.lang.reflect.Method.invoke (Méthode native) à Java.lang.reflect.Method.invoke (Method.Java:372) à com.Android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.Java:899) sur com.Android.internal.os.ZygoteInit.main (ZygoteInit.Java:694) Causée par: kotlin.TypeCastException: null ne peut pas être converti en un type non nul com.midsizemango.databasekotlin.Note à com.midsizemango.databasekotlin.EditNoteActivity.onCreate (EditNoteActivity.kt: 82) sur Android.app.Activity.performCreate (Activity.Java:5933) sur Android.app .Instrumentation.callActivityOnCreate (Instrumentation.Java:1105) sur Android.app.ActivityThread.performLaunchActivity (ActivityThread.Java:2251) sur Android.app.ActivityThread.handleLaunchActivity (ActivityThread.Java:2251) sur Android.app.ActivityThread.handleLaunchActivity (ActivityThread.Java:60. (ActivityThread.Java:144) sur Android.app.ActivityThread $ H.handleMessage (ActivityThread.Java:1278) sur Android.os.Handler.dispatchMessage (Handler.Java:102) sur Android.os.Looper.loop (Looper. Java: 135) sur Android.app.ActivityThread.main (ActivityThread.Java:5221) sur Java.lang.reflect.Method.invoke (Méthode native) sur Java.lang.reflect.Method.invoke (Method.Java:372) sur com.Android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.Java:899) sur com.Android.internal.os.ZygoteInit.main (ZygoteInit.Java : 694)

androidkotlin
45
Prasad Shirvandkar

Dans cette ligne:

note = intent.getSerializableExtra(EXTRA_NOTE) as Note

Note est un type non-nul , ainsi le transfert qui en découle déclenche une vérification nulle. Puisque vous comparez ensuite note à null manuellement, vous vouliez probablement dire opérateur de casting sécurisé , ce qui donne null si l'expression n'est pas de le type spécifié dans le côté droit:

note = intent.getSerializableExtra(EXTRA_NOTE) as? Note
124
Alexander Udalov