Question

I have read about global static technique in which we create a class with static fields which can be accessed in any activity. Is there any other way to pass large data sets like ArrayList<Drawables> or HashMaps ?
I have also read about Serializable but have no idea how to use it. Any example code is welcome…

Answer 1

Intent intent = new Intent(getBaseContext(), NextActivity.class);
intent.putExtra("arraylist", new ArrayList<String>());

If your ArrayList contains another Object that you have created yourself, for instance Friend.class, you can implement the Friend.class with Serializable and then:

Intent intent = new Intent(getBaseContext(), NextActivity.class);
intent.putExtra("friendlist", new ArrayList<Friend>());

And for receiving it on NextActivity.class:

Bundle extras = getIntent().getExtras();
    if(extras != null){
        ArrayList<Friend> friends = extras.getSerializable("friendlist");
    }

Well, instead of passing an empty ArrayList, you’ll have to put values into the ArrayList and then pass it, but you get the idea.