CODEWITHSUNDEEP
androidandroid-activity
Padraig
Padraig

Reputation: 87

Android TTS from multiple Activities

I would like to make sparing use of TTS from several Activities (one MAIN Activity can start multiple other Activities).

I realize that there is no concept of a "global" class (or any other global anything), other than via Application and Activity.getApplication(). It is all but useless since it returns null in an Activity's onCreate() methods, or constructors. This appears to be because the Activity is not "attached" to the Application context until the object is completely constructed.

There MUST to be a way to do this that isn't full-on silly, like re-implementing TTS in each and every Activity.

Alternative: I use Intent and startActivity() to start each new Activity, so is there a way to pass a reference to the toplevel Activity via Intent.putExtras()?

Upvotes: 3

Views: 1746

Answers (3)

Nikolay Elenkov
Nikolay Elenkov

Reputation: 52936

TextToSpeech is tied to a Context (Activity), so you can't really make a 'global' object you can just use anywhere. If you don't want to duplicate code, create an base TtsActivity and put common code there. Or, create a TtsManager or similar class that takes care of initializing, etc. TTS and put it in all activities that need it.

Upvotes: 1

JeffS
JeffS

Reputation: 2737

You can create a regular Java class that inherits from Object, and put the methods you want in there.

Edit: I've never used android TTS, but it should look something like this, I'd gather

public class SpeechHelper {

   public static void speak(String text, Context con)
   {
        TextToSpeech tts = new TextToSpeech(con, TextToSpeech.onInitListener {
             private void onInit(int status){
                 tts.speak(text, TextToSpeech.QUEUE_ADD, new HashMap<String, String>());
             }
        });
   }
}

Upvotes: 0

David Wasser
David Wasser

Reputation: 95578

getApplication() always returns a valid reference if called from within your activity's onCreate() method. It will return null if called within the activity's constructor, but you shouldn't define a constructor for an activity anyway. Are you trying to call onCreate() yourself?

If you want to store data in the Application instance then you will need to subclass Application and you will need to provide the name of your subclass in the manifest as

<application android:name="fully.qualified.name.of.my.application.subclass">

Upvotes: 0

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