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The constants RESULT_OK, RESULT_CANCEL, and RESULT_FIRST_USER are all defined in the Activity class. The numerical values of these constants are

RESULT_OK = -1; RESULT_CANCEL = 0; RESULT_FIRST_USER = 1;

Users of the class are insulated from the implementation, which provides the programmer with the ability to change the underlying implementation without affecting users of that code. This idea, known as data hiding and encapsulation, is an important feature of OOP.

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ersonal computing continues to become more personal in that computers are becoming increasingly accessible anytime, anywhere At the forefront of this advancement are handheld devices that are transforming into computing platforms Mobile phones are no longer just for talking they have been capable of carrying data and video for some time More significantly, the mobile device is now becoming so capable of general-purpose computing that it s destined to become the next PC It is also anticipated that a number of manufacturers such as ASUS, HP, and Dell will be producing netbooks based on the Android OS So the battle lines of operating systems, computing platforms, programming languages, and development frameworks are being shifted and reapplied to mobile devices We are also expecting a surge in mobile programming in the IT industry as more and more IT applications start to offer mobile counterparts.

To make this work, the implementer should have code that explicitly addresses the needs of a PICK. Let s look at how this is done in the Google sample Notepad application. When the item is selected in the list of items, the intent that invoked the activity is checked to see whether it s a PICK intent. If it is, the data URI is set in a new intent and returned through setResult():

@Override protected void onListItemClick(ListView l, View v, int position, long id) { Uri uri = ContentUris.withAppendedId(getIntent().getData(), id); String action = getIntent().getAction(); if (Intent.ACTION_PICK.equals(action) || Intent.ACTION_GET_CONTENT.equals(action)) { // The caller is waiting for us to return a note selected by // the user. They have clicked on one, so return it now. setResult(RESULT_OK, new Intent().setData(uri)); } else { // Launch activity to view/edit the currently selected item startActivity(new Intent(Intent.ACTION_EDIT, uri)); } }

This encapsulation promotes code reuse. Users of the preceding class do not have to worry if I change the implementation as long as the methods stay the same. I could rewrite the class to use a hardware random number generator, if available; the users of the class will not be affected. Object-based encapsulation is conceptually the same as the OCaml module system s capability to hide data and functions. Another way that OOP promotes code reuse is via the inheritance mechanism. Inheritance is when a class inherits the methods and values of a parent class. You will learn about this in much greater depth later in this chapter. Finally, OOP should be used when objects are the best way to express a solution. There are times when you are working with things that might have data attributes and actions that they can perform. Problems in which you are working with objects are sometimes best solved by using objects. It is important to remember that much of the functionality provided by objects in more traditional object-oriented languages can be implemented by using the OCaml module system. OCaml enables you to make methods and data members private, although privacy is also available via the module system. In OCaml, it is not an either/or situation with regard to modules and objects. You can use objects within modules. As always, you should use the tool that enables you to accomplish your goals.

ACTION_GET_CONTENT is similar to ACTION_PICK. In the case of ACTION_PICK, you are specifying a URI that points to a collection of items such as a collection of notes. You

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