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Ludiras
Asked: 2020-07-16 12:42:46 +0800 CST 2020-07-16 12:42:46 +0800 CST

I get an NPE in the onDestroy method (Android Java)

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Good folks, I have my following onDestroy() method:

@Override
protected void onDestroy() {
    super.onDestroy();
    mSpeechRecognizer.cancel();
    mSpeechRecognizer.destroy();
}

According to the Google console, it is causing a NPE sometimes, I have checked and yes. I think the reason is that sometimes I am destroying a process that has not started and I know that the solution is with an if, but I don't know how to tell it to destroy it when it has started.

java

1 Answers

  1. Best Answer

    In this case the problem is that sometimes the instance of SpeechRecognizermay never have been initialized or was active and now has a null value.

    In this case when you close your application or Activityyou must validate the case in which it mSpeechRecognizerhas a null value:

    @Override
protected void onDestroy() {
    super.onDestroy();
    if(mSpeechRecognizer != null){
      mSpeechRecognizer.cancel();
      mSpeechRecognizer.destroy();
    }
}

    I don't know how to tell it to destroy it when it has started.

    If it has been started, mSpeechRecognizerit will not be null so the following lines will do the job in this case.

      //Detiene.
  mSpeechRecognizer.cancel();
  //Destruye.
  mSpeechRecognizer.destroy();

    Why isn't the stopListening() method working? android java

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