Error: onActivityResult overrides nothing

Question

I am programming a speech recognition app in Kotlin for Android.

class MainActivity : AppCompatActivity() {     public override fun onCreate(savedInstanceState: Bundle?) {         super.onCreate(savedInstanceState)         setContentView(R.layout.activity_main)          val intent:Intent = Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH)             intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM)         startActivityForResult(intent, REQUEST_CODE)      }      override fun onActivityResult(requestCode:Int, resultCode:Int, data:Intent) {         if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {/*do something*/  }         super.onActivityResult(requestCode, resultCode, data)     } } 

Strangly the compiler always finds the Error: 'onActivityResult' overrides nothing.

Documentation of Android states that result of startActivityForResult can be retrived with onActivityResult.

Now the question: how can one get the result of speech recognition using Kotlin?

Answer 1

Replace

override fun onActivityResult(requestCode:Int, resultCode:Int, data:Intent) 

With below code, to make Intent object nullable.

override fun onActivityResult(requestCode:Int, resultCode:Int, data:Intent?) 

As Intent is declared nullable in parent Activity class. Here is the sample code:

protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data)