java barcode generator source code The power and the complexity of Intents in Java

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The power and the complexity of Intents
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It s not hard to imagine that an absolutely unique user experience is possible with Android because of the variety of Activitys with specific IntentFilters that are installed on any given device. It s architecturally feasible to upgrade various aspects of an Android installation to provide sophisticated functionality and customization. Though this might be a desirable characteristic for the user, it can be troublesome for someone providing tech support who has to navigate a number of components and applications to troubleshoot a problem. Because of the potential for added complexity, this approach of ad hoc system patching to upgrade specific functionality should be entertained cautiously and with your eyes wide open to the potential pitfalls associated with this approach.
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Four kinds of Android components
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Let s build on your knowledge of the Intent and IntentFilter classes and explore the four primary components of Android applications, as well as their relation to the Android process model. We ll include code snippets to provide a taste of Android application development. We re going to leave more in-depth examples and discussion for later chapters. A particular Android application might not contain all of these elements, but will have at least one of these elements, and could have all of them.
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Activity
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An application might have a UI, but it doesn t have to have one. If it has a UI, it ll have at least one Activity. The easiest way to think of an Android Activity is to relate it to a visible screen, because more often than not there s a one-to-one relationship between an Activity and a UI screen. This relationship is similar to that of a controller in the MVC paradigm. Android applications often contain more than one Activity. Each Activity displays a UI and responds to system- and user-initiated events. The Activity employs one or more Views to present the actual UI elements to the user. The Activity class is extended by user classes, as shown in the following listing.
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Listing 1.1 A basic Activity in an Android application
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package com.msi.manning.chapter1; import android.app.Activity; import android.os.Bundle; public class Activity1 extends Activity { @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.main); } }
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The Activity class is part of the android.app Java package, found in the Android runtime. The Android runtime is deployed in the android.jar file. The class Activity1 extends the class Activity, which we ll examine in detail in chapter 3. One of the primary tasks an Activity performs is displaying UI elements, which are implemented as Views and are typically defined in XML layout files. 3 goes into more detail on Views and Resources. Moving from one Activity to another is accomplished with the startActivity() method or the startActivityForResult() method when you want a synchronous call/result paradigm. The argument to these methods is an instance of an Intent. The Activity represents a visible application component within Android. With assistance from the View class, which we ll cover in chapter 3, the Activity is the most
Introducing Android
You say Intent; I say Intent
The Intent class is used in similar sounding but very different scenarios. Some Intents are used to assist in navigating from one Activity to the next, such as the example given earlier of viewing a contact record. Activities are the targets of these kinds of Intents, which are used with the startActivity or startActivityForResult methods. Also, a Service can be started by passing an Intent to the startService method. BroadcastReceivers receive Intents when responding to system-wide events, such as a ringing phone or an incoming text message.
commonly employed Android application component. The next topic of interest is the Service, which runs in the background and doesn t generally present a direct UI.
Service
If an application is to have a long lifecycle, it s often best to put it into a Service. For example, a background data synchronization utility should be implemented as a Service. A best practice is to launch Services on a periodic or as-needed basis, triggered by a system alarm, and then have the Service terminate when its task is complete. Like the Activity, a Service is a class in the Android runtime that you should extend, as shown in the following listing. This example extends a Service, and periodically publishes an informative message to the Android log.
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