Trying to call Toaster or Custom function inside s

问题:

In my main Fragment, I have implemented TextToSpeech mainFragment extends Fragment implements TextToSpeech.OnInitListener.

The text to speech is working fine, also i have added an UtteranceProgressListener which is working.

My problem : Am unable to call any custom functions eg gotoNextChapter() or even a simple Toaster. getting error Can't create handler inside thread that has not called Looper.prepare()

Any suggestions or solutions welcomed....

My code snippet:

UtteranceProgressListener SpeechListener = new UtteranceProgressListener() {
            @Override
            public void onStart(String utteranceId) {
                Toast.makeText(getActivity(),utteranceId, Toast.LENGTH_LONG).show();
            }

            @Override
            public void onDone(String utteranceId) {
                Toast.makeText(getActivity(),utteranceId, Toast.LENGTH_LONG).show();

                gotoNextChapter(); <====function I want to call
                read_mode = 0;
            }

            @Override
            public void onError(String utteranceId) {
                Toast.makeText(getActivity(),utteranceId, Toast.LENGTH_LONG).show();
            }
        };

Setting the utterance complete listener:

myTTS.setOnUtteranceProgressListener(SpeechListener);

Error am getting:

Caught a RuntimeException from the binder stub implementation.
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
                                                            at
android.os.Handler.<init>(Handler.java:209)
                                                            at
android.os.Handler.<init>(Handler.java:123)
                                                            at
android.widget.Toast$TN.<init>(Toast.java:350)
                                                            at
android.widget.Toast.<init>(Toast.java:106)
                                                            at
android.widget.Toast.makeText(Toast.java:264)
                                                            at com.MainActivity$Read$10.onDone(MainActivity.java:1252)

回答1:

ok I got a solution, now my question just seems trivial

my updated code looks like this:

@Override
public void onDone(String utteranceId) {

runOnUiThread(new Runnable() {

                public void run() {
                    Toast.makeText(getContext(),utteranceId,Toast.LENGTH_LONG).show();
gotoNextChapter(); <====function I want to call
read_mode = 0;
                }
            });
}

Thanks to these guyes here: How can I Toast after Text to Speech finish speaking Android and When may we need to use runOnUiThread in android application?

回答2:

If you are in Activity:

runOnUiThread(new Runnable() {
    @Override
    public void run() { 
        Toast.makeText(getActivity(),"...", Toast.LENGTH_LONG).show();  
    }
});

If you are in a fragment:

getActivity().runOnUiThread(new Runnable() {
    @Override
    public void run() {
        Toast.makeText(getActivity(),"...", Toast.LENGTH_LONG).show();         
    }
});

Else you can do this:

Handler mainHandler = new Handler(context.getMainLooper());

Runnable myRunnable = new Runnable() {
    @Override 
    public void run() {
        Toast.makeText(getActivity(),"...", Toast.LENGTH_LONG).show();  
    } 
};
mainHandler.post(myRunnable);