New PDF release: Beginning Android Application Development (Wrox Programmer

By Wei-Meng Lee

ISBN-10: 1118017110

ISBN-13: 9781118017111

Create must-have purposes for the most recent Android OS
The Android OS is a well-liked and versatile platform for plenty of of today's such a lot in-demand cellular units. This full-color advisor provide you with a hands-on advent to making Android purposes for the newest cellular units. Veteran writer Wei Meng Lee accompanies every one lesson with real-world examples to force domestic the content material he covers. starting with an summary of middle Android good points and instruments, he strikes at a gentle velocity whereas educating every thing you want to understand to effectively boost your personal Android applications.* Explains what an task is and studies its lifecycle* Zeroes in on customizing actions by means of utilising kinds and issues* appears to be like on the parts of a display, together with LinearLayout, AbsoluteLayout, and RelativeLayout, between others* information how one can adapt to diversified reveal sizes and regulate exhibit orientation* studies the diversity of perspectives comparable to TextView, ProgressBar, TimePicker, and more
Beginning Android software Development pares down the main crucial steps you want to recognize so that you can commence growing Android functions this present day.

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Extra info for Beginning Android Application Development (Wrox Programmer to Programmer)

Example text

OnStop() { //... } onDestroy() { //... } Press F11 to debug the application on the Android Emulator. When the first activity is loaded, click the center of the directional pad (see Figure 2-13; on a real device this can be achieved by pressing down the trackball). The second activity will now be loaded. java). Hence, if you want to add another activity to a project, you need to create these two components. DEFAULT” /> Here, you have added a new activity to the application.

44 ❘ Chapter 2 Activities and Intents 4. xml file by right-clicking on it and selecting Copy. Then, right-click on the res/layout folder and select Paste. xml. xml file (see Figure 2-12). Figure 2-10 Figure 2-11 5. ” /> 6. activity2); } } 7. Intent; public class MainActivity extends Activity { String tag = “Events”; /** Called when the activity is first created. ACTIVITY2”)); ❘ 45 46 ❘ Chapter 2 Activities and Intents } return false; } public public public public public public } 8.

LAUNCHER” /> The Activity base class defines a series of events that governs the life cycle of an activity. The Activity class defines the following events: ➤ onCreate() — Called when the activity is first created ➤ onStart() — Called when the activity becomes visible to the user ➤ onResume() — Called when the activity starts interacting with the user ➤ onPause() — Called when the current activity is being paused and the previous activity is being resumed ➤ onStop() — Called when the activity is no longer visible to the user ➤ onDestroy() — Called before the activity is destroyed by the system (either manually or by the system to conserve memory) ➤ onRestart() — Called when the activity has been stopped and is restarting again Understanding Activities ❘ 29 By default, the activity created for you contains the onCreate() event.

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Beginning Android Application Development (Wrox Programmer to Programmer) by Wei-Meng Lee

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