By Wei-Meng Lee

Create must-have functions for the most recent Android OS
The Android OS is a well-liked and versatile platform for plenty of of today's so much in-demand cellular units. This full-color advisor will give you a hands-on creation to making Android purposes for the newest cellular units. Veteran writer Wei Meng Lee accompanies each one lesson with real-world examples to force domestic the content material he covers. starting with an outline of center Android good points and instruments, he strikes at a gradual speed whereas educating every little thing you want to comprehend to effectively boost your individual Android applications.* Explains what an job is and experiences its lifecycle* Zeroes in on customizing actions by way of employing types and topics* appears to be like on the parts of a reveal, together with LinearLayout, AbsoluteLayout, and RelativeLayout, between others* info how you can adapt to various reveal sizes and alter demonstrate orientation* stories the range of perspectives resembling TextView, ProgressBar, TimePicker, and more
Beginning Android software Development pares down the main crucial steps you want to be aware of so that you can begin developing Android purposes this day.

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Additional resources for Beginning Android Application Development (Wrox Programmer to Programmer)

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The next section discusses what happens when two or more activities have the same intent filter. DEFAULT”. You need to add this to the intent filter so that this activity can be started by another activity using the startActivity() method (more on this shortly). java file, you implemented the onKeyDown event handler. This event is fired whenever the user presses one of the keys on the device. ACTIVITY2”)); } return false; } Activities in Android can be invoked by any application running on the device.

Hiding the Activity Title You can also hide the title of an activity if desired (such as when you just want to display a status update to the user). Window; public class MainActivity extends Activity { String tag = “Events”; /** Called when the activity is first created. d(tag, “In the onCreate() event”); } } This will hide the title bar, as shown in Figure 2-5. Understanding Activities 3. length]; /** Called when the activity is first created. makeText(getBaseContext(), items[which] + (isChecked ?

This is one of the fundamental concepts in Android that enables an application to invoke another easily. class)); However, this approach is applicable only when the activity you want to display is within the same project as the current activity. 48 ❘ Chapter 2 Activities and Intents Resolving Intent Filter Collision In the previous section, you learned that the element defines how your activity can be invoked by another activity. What happens if another activity (in either the same or a separate application) has the same filter name?

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