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We ve chosen to use the Menu here, in addition to the onscreen buttons. Though either (or both) can work in many scenarios, you need to consider whether the menu, which is invoked by pressing the Menu button on the device and tapping a selection (button and a tap) is appropriate for what you re doing, or whether an onscreen button (single tap) is more appropriate. Generally, onscreen buttons should be tied to UI elements, such as a search button for a search form input, and menu items should be used for more broad actions such as submitting a form, or performing an action such as creating, saving, editing, or deleting. Because all rules need an exception, if you have the screen real estate, it might be more convenient for users to have onscreen buttons for actions as well, as we ve done in the ReviewCriteria Activity. The most important thing to keep in mind with these types of UI decisions is to be consistent. If you do it one way on one screen, use that same approach on other screens.

Finally, some JavaScript within <script> and </script> tags is returned, which makes use of $e1, $e2, and $e3 by first assigning their values to the JavaScript variables e1, e2, and e3 Then a documentwrite() command is added to the string (this is similar to a PHP echo command) in which an HTML mailto: link is displayed by recombining the parts

Figure 6-8

because we re using it from multiple places both from our onscreen Button and our MenuItem The Application object is used internally by Android for many purposes, and it can be extended, as we ve done with RestaurantFinderApplication To store global state information, the RestaurantFinderApplication defines a few member variables in JavaBean style We reference this object from other activities to retrieve the information we re storing here Objects can be passed back and forth between activities in several ways; using Application is just one of them You can also use public static members and Intent extras with Bundle objects Additionally, you can use the provided SQLite database, or you can implement your own ContentProvider to store data We ll talk more about state and data persistence in general, including all these concepts, in chapter 5.

To use this function, pass it a valid e-mail address and the returned value can then be output to a browser, like this:

The important thing to take away here is that at this point we re using the Application object to manage state between activities After we store the criteria state, we fire off an action in the form of an Android Intent E We touched on Intents in chapter 1, and we ll delve into them further in the next chapter, but basically we re asking another Activity to respond to the user s selection of a menu item by calling startActivity(intent) An alternative way to start an Activity is with the startActivityForResult method, which we ll introduce later in this book Also notable in the ReviewCriteria example is that we re using an AlertDialog F.

Figure 6-9

Before we allow the next Activity to be invoked, we call a simple validate() method that we ve created, where we display a pop-up alert dialog to the user if the location hasn t been properly specified Along with generally demonstrating the use of AlertDialog, this demonstrates how a button can be made to respond to a click event with an OnClickListener() With that, we ve covered a good deal of material and you ve completed ReviewCriteria, your first Activity Now that this class is fully implemented, we ll take a closer look at the Android Activity lifecycle and how it relates to processes on the platform..

$email = 'billgates@microsoftcom'; $pemail = PIPHP_ProtectEmail($email); echo "My email address is $pemail";

You might have noticed the use of the Builder pattern, where we add parameters to the AlertDialog we created in the ReviewCriteria class. If you aren t familiar with this approach, each of the methods invoked, such as AlertDialog.setMessage() and AlertDialog.setTitle(), returns a reference to itself (this), which means we can continue chaining method calls. This approach avoids either an extra-long constructor with many parameters or repeating the class reference throughout the code. Intents also use this handy pattern; it s something you ll see time and time again in Android.

Or more concisely:

6