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CATEGORY_SELECTED_ALTERNATIVE An activity can declare itself as an ALTERNATIVE activity for a certain type of data. This is similar to listing a series of possible editors for a text document or an HTML document. CATEGORY_LAUNCHER CATEGORY_HOME Assigning this category to an activity will allow it to be listed on the launcher screen. An activity of this type will be the home screen. Typically, there should be only one activity of this type. If there are more, the system will prompt you to pick one. This activity identifies an activity as a preference activity, so it will be shown as part of the preferences screen. An activity of this type is embeddable in a parent activity. A test activity. This category has been superseded by the GADGET category, but it s been kept for backward compatibility.

You can read the details of these activity categories at the following Android SDK URL for the Intent class: http://code.google.com/android/reference/android/content/Intent.html#CATEGORY_A LTERNATIVE. When you use an intent to start an activity, you can specify the kind of activity to choose by specifying a category. Or you can search for activities that match a certain category. Here is an example to retrieve a set of main activities that match the category of CATEGORY_SAMPLE_CODE:

@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Log.d(TAG, "starting service"); Button bindBtn = (Button)findViewById(R.id.bindBtn); bindBtn.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { startService(new Intent(MainActivity.this, BackgroundService.class)); }}); Button unbindBtn = (Button)findViewById(R.id.unbindBtn); unbindBtn.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { stopService(new Intent(MainActivity.this, BackgroundService.class)); }}); } } // main.xml (layout file for MainActivity.java) < xml version="1.0" encoding="utf-8" > <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Button android:id="@+id/bindBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Bind" /> <Button android:id="@+id/unbindBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="UnBind" /> </LinearLayout>

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s Note Back in the days before assembly language, programmers had to program in machine code directly

Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CATEGORY_SAMPLE_CODE); PackageManager pm = getPackageManager(); List<ResolveInfo> list = pm.queryIntentActivities(mainIntent, 0);

PackageManager is a key class that allows you to discover activities that match certain intents without invoking them. You can cycle through the received activities and invoke them as you see fit, based on the ResolveInfo API. Following the same logic, you can also get a list of all launchable applications by populating an intent with a category of CATEGORY_LAUNCHER:

Note that Listing 8-9 uses an activity to interface with the service, but any component in your application can use the service This includes other services, activities, generic classes, and so on The example creates a user interface with two buttons, labeled Bind and UnBind Clicking the Bind button will start the service by calling startService(); clicking UnBind will stop the service by calling stopService() Now let s talk about the meat of the example: the BackgroundService The BackgroundService is a typical example of a service that is used by the components of the application that is hosting the service In other words, the application that is running the service is also the only consumer Because the service does not support clients from outside its process, the service is a local service.

For these purposes, programming styles can be divided into three groups: structured, object-oriented, and functional. They are not strong divisions, and often a given programming language supports features of all three. Most of the time, a given programming language does have more strength in one of the three groups.

//Get me all launchable applications Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); List mApps = getPackageManager().queryIntentActivities(mainIntent, 0);

In fact, we can do better. Let s start an activity based on the preceding intent category CATEGORY_LAUNCHER:

And because it s a local service as opposed to a remote service, it returns null in the bind() method Therefore, the only way to bind to this service is to call ContextstartService() The critical methods of a local service are: onCreate(), onStart(), stop*(), and onDestroy() In the onCreate() method of the BackgroundService, we create a thread that does the service s heavy lifting We need the application s main thread to deal with user interface activities, so we delegate the service s work to a secondary thread Also note that we create and start the thread in onCreate() rather than onStart() We do this because onCreate() is called only once, and we want the thread to be created only once during the life of the service onStart() can be called more than once, so it doesn t suit our needs here.

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