TextToSpeech Null Pointer Exception with Context

Question

I'm attempting to create a TextToSpeech manager class.

I'm getting a Null Pointer Exception error when the class’s constructor is called.

The TTS managing class accepts a single Context parameter.

The MainActivity class attempts to instantiate the object by calling

TTS_Manager tts = new TTS_Manager(this);

Logcat shows the TTS_Manager class’s constructor being called and then the NPE:

TextToSpeech ttsVoice = new TextToSpeech(context, this);

My take is that there is something wrong with the way the context is being handled.

package com.example.TTS01;

import android.content.Context;
import android.speech.tts.TextToSpeech;
import android.speech.tts.UtteranceProgressListener;

public class TTS_Manager implements TextToSpeech.OnInitListener{
    TextToSpeech ttsVoice;

    public void TTS_Manager(Context context){
        //Null Pointer Exception thrown on next line
        TextToSpeech ttsVoice = new TextToSpeech(context, this);

        ttsVoice.setOnUtteranceProgressListener(new UtteranceProgressListener() {
            @Override
            public void onStart(String utteranceID) {
                            }

            @Override
            public void onDone(String utteranceID) {
                            }

            @Override
            public void onError(String utteranceID) {
                            }
        });

    }

    @Override
    public void onInit(int i) {

    }
}

Andrew Luo · Accepted Answer · 2014-10-26 17:58:45Z

1

Looks like you're leaking a partially constructed TTS_Manger in it's own constructor function by passing this to new TextToSpeech. For example, the ttsVoice member will be null at this time. Also:

TextToSpeech ttsVoice = new TextToSpeech(context, this);

Does not updated the member, but a local variable.

Avoid passing this in the constructor to other classes.

answered Oct 26, 2014 at 17:58

Andrew Luo

9271 gold badge5 silver badges6 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

TextToSpeech Null Pointer Exception with Context

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related