Question

I’ve got an object that I use to interact with various things. The object itself is initialized in my first activity and used in all subsequent activities. What’s the best way to make it “public” to all activities?

Answer 1

Create a class that extends Application and hold the instance there.

class MyApp extends Application{
    private Object obj;
    public Object getObject(){
         return obj;
    }
}

Then in your Activity

MyApp ma = (MyApp)getApplicationContext();
Object o = ma.getObject();

You can read more about the Application class on the android developer website: http://developer.android.com/reference/android/app/Application.html