Android Toast Messages not working

Question

I'm developing a game via Andengine for Android. I have MainActivity class and GameScene class. I use Toast messages in GameActivity. And it is working.

Toast.makeText(this, " Hello World", Toast.LENGTH_SHORT).show();

So I wanna use Toast messages in GameScene class. But it doesn't work. Here is the code:

Toast.makeText(activity, " Hello World", Toast.LENGTH_SHORT).show();

I have to use "activity" instead of "this". But it doesn't work

why?

EDITED:

when I use second one, an error occurs. LogCat: http://s29.postimg.org/k8faj9mdj/Capture.png

Answer 1

Since You are calling it from the class. you need to get the context from the activity through the class constructor or else you need to use GetApplicationcontext().

Answer 2

Since you asked why; i think you're giving an activity reference as a context to the Toast message, this is why it isn't working.

If you're trying to show a Toast message from outside of an activity, you could try :

Toast.makeText(activity.getApplicationContext(), " Hello World", Toast.LENGTH_SHORT).show();

or from the GameActivity

Toast.makeText(GameActivity.this, " Hello World", Toast.LENGTH_SHORT).show();

or from the MainActivity

Toast.makeText(MainActivity.this, " Hello World", Toast.LENGTH_SHORT).show();