Question

I created a TTS module. It was working perfectly on a stand alone basis but when I tried implementing it as a class for my project it misbehaves and throws null pointer exception.

What I plan to achieve:

1) Read a text file from /res/raw folder.
2) convert the text file into speech via TTS. The string s has captured the whole file via the BufferReader class.

The code I have used for TTS is –

private TextToSpeech tts;
tts.speak(s, TextToSpeech.QUEUE_FLUSH, null);
Intent checkIntent = new Intent();
checkIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
    startActivityForResult(checkIntent, MY_DATA_CHECK_CODE);

The error comes on the tts.speak….. line. I found out this line by adding log.d throughout the code. There is no log.d registered post the above tts.speak code.

Please help me in debugging the issue.

thanks a ton in advance.

Answer 1

You’ve shown declaring the variable:

private TextToSpeech tts;

… and you’ve shown using the variable:

tts.speak(s, TextToSpeech.QUEUE_FLUSH, null);

… but do you ever initialize the variable? If you don’t assign it a value, it will always have the default value of null. Judging by this tutorial you need something like this (I’m assuming your code is in an Activity):

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    tts = new TextToSpeech(this, this);
    ...
}