Contains high-level classes encapsulating the overall Android application model.
An Android application is defined using one or more of Android's four core application
components. Two such application components are defined in this package: Activity and Service. The other two components are from the android.content package: BroadcastReceiver and ContentProvider.
An Activity is an application component that provides a screen with which
users can interact in order to do something, such as dial the phone, take a photo, send an email, or
view a map. An activity can start other activities, including activities that live in separate
applications.
A Service is an application component that can perform
long-running operations in the background without a user interface. For example, a service
can handle network transactions, play music, or work with a content provider without the user being
aware of the work going on.
The Fragment class is also an important part of an application's
design—especially when designing for large screen devices, such as tablets. A fragment defines
a distinct part of an activity's behavior, including the associated UI. It has its own lifecycle
that is similar to that of the activity and can exist alongside other fragments that are embedded in
the activity. While an activity is running, you can add and remove fragments and include each
fragment in a back stack that's managed by the activity—allowing the user to navigate
backwards through the fragment states, without leaving the activity.
This package also defines application utilities, such as dialogs, notifications, and the action bar.
For information about using some the classes in this package, see the following documents: Activities, Services, Fragments, Using the Action Bar, Creating Dialogs, and Notifying the User.
| ActionBar.OnMenuVisibilityListener | Listener for receiving events when action bar menus are shown or hidden. |
| ActionBar.OnNavigationListener | Listener interface for ActionBar navigation events. |
| ActionBar.TabListener | Callback interface invoked when a tab is focused, unfocused, added, or removed. |
| DatePickerDialog.OnDateSetListener | The callback used to indicate the user is done filling in the date. |
| FragmentManager.BackStackEntry | Representation of an entry on the fragment back stack, as created
with FragmentTransaction.addToBackStack(). |
| FragmentManager.OnBackStackChangedListener | Interface to watch for changes to the back stack. |
| KeyguardManager.OnKeyguardExitResult | Callback passed to exitKeyguardSecurely(KeyguardManager.OnKeyguardExitResult) to notify
caller of result. |
| LoaderManager.LoaderCallbacks<D> | Callback interface for a client to interact with the manager. |
| PendingIntent.OnFinished | Callback interface for discovering when a send operation has completed. |
| SearchManager.OnCancelListener | See setOnCancelListener(SearchManager.OnCancelListener) for configuring your activity to monitor
search UI state. |
| SearchManager.OnDismissListener | See setOnDismissListener(SearchManager.OnDismissListener) for configuring your activity to monitor
search UI state. |
| TimePickerDialog.OnTimeSetListener | The callback interface used to indicate the user is done filling in the time (they clicked on the 'Set' button). |
| ActionBar | This is the public interface to the contextual ActionBar. |
| ActionBar.LayoutParams | Per-child layout information associated with action bar custom views. |
| ActionBar.Tab | A tab in the action bar. |
| Activity | An activity is a single, focused thing that the user can do. |
| ActivityGroup | A screen that contains and runs multiple embedded activities. |
| ActivityManager | Interact with the overall activities running in the system. |
| ActivityManager.MemoryInfo | Information you can retrieve about the available memory through
getMemoryInfo(ActivityManager.MemoryInfo). |
| ActivityManager.ProcessErrorStateInfo | Information you can retrieve about any processes that are in an error condition. |
| ActivityManager.RecentTaskInfo | Information you can retrieve about tasks that the user has most recently started or visited. |
| ActivityManager.RunningAppProcessInfo | Information you can retrieve about a running process. |
| ActivityManager.RunningServiceInfo | Information you can retrieve about a particular Service that is currently running in the system. |
| ActivityManager.RunningTaskInfo | Information you can retrieve about a particular task that is currently "running" in the system. |
| AlarmManager | This class provides access to the system alarm services. |
| AlertDialog | A subclass of Dialog that can display one, two or three buttons. |
| AlertDialog.Builder | |
| AliasActivity | Stub activity that launches another activity (and then finishes itself) based on information in its component's manifest meta-data. |
| Application | Base class for those who need to maintain global application state. |
| DatePickerDialog | A simple dialog containing an DatePicker. |
| Dialog | Base class for Dialogs. |
| DialogFragment | A fragment that displays a dialog window, floating on top of its activity's window. |
| DownloadManager | The download manager is a system service that handles long-running HTTP downloads. |
| DownloadManager.Query | This class may be used to filter download manager queries. |
| DownloadManager.Request | This class contains all the information necessary to request a new download. |
| ExpandableListActivity | An activity that displays an expandable list of items by binding to a data source implementing the ExpandableListAdapter, and exposes event handlers when the user selects an item. |
| Fragment | A Fragment is a piece of an application's user interface or behavior
that can be placed in an Activity. |
| FragmentBreadCrumbs | Helper class for showing "bread crumbs" representing the fragment stack in an activity. |
| FragmentManager | Interface for interacting with Fragment objects inside of an
Activity
|
| FragmentTransaction | API for performing a set of Fragment operations. |
| Instrumentation | Base class for implementing application instrumentation code. |
| Instrumentation.ActivityMonitor | Information about a particular kind of Intent that is being monitored. |
| Instrumentation.ActivityResult | Description of a Activity execution result to return to the original activity. |
| IntentService | IntentService is a base class for Services that handle asynchronous
requests (expressed as Intents) on demand. |
| KeyguardManager | Class that can be used to lock and unlock the keyboard. |
| KeyguardManager.KeyguardLock | Handle returned by newKeyguardLock(String) that allows
you to disable / reenable the keyguard. |
| LauncherActivity | Displays a list of all activities which can be performed for a given intent. |
| LauncherActivity.IconResizer | Utility class to resize icons to match default icon size. |
| LauncherActivity.ListItem | An item in the list |
| ListActivity | An activity that displays a list of items by binding to a data source such as an array or Cursor, and exposes event handlers when the user selects an item. |
| ListFragment | A fragment that displays a list of items by binding to a data source such as an array or Cursor, and exposes event handlers when the user selects an item. |
| LoaderManager | Interface associated with an Activity or Fragment for managing
one or more Loader instances associated with it. |
| LocalActivityManager | Helper class for managing multiple running embedded activities in the same process. |
| NativeActivity | Convenience for implementing an activity that will be implemented purely in native code. |
| Notification | A class that represents how a persistent notification is to be presented to
the user using the NotificationManager. |
| Notification.Builder | Builder class for Notification objects. |
| NotificationManager | Class to notify the user of events that happen. This is how you tell the user that something has happened in the background. |
| PendingIntent | A description of an Intent and target action to perform with it. |
| ProgressDialog | A dialog showing a progress indicator and an optional text message or view. |
| SearchableInfo | Searchability meta-data for an activity. |
| SearchManager | This class provides access to the system search services. |
| Service | A Service is an application component representing either an application's desire to perform a longer-running operation while not interacting with the user or to supply functionality for other applications to use. |
| TabActivity | An activity that contains and runs multiple embedded activities or views. |
| TimePickerDialog | A dialog that prompts the user for the time of day using a TimePicker. |
| UiModeManager | This class provides access to the system uimode services. |
| WallpaperInfo | This class is used to specify meta information of a wallpaper service. |
| WallpaperManager | Provides access to the system wallpaper. |
| Fragment.InstantiationException | Thrown by instantiate(Context, String, Bundle) when
there is an instantiation failure. |
| PendingIntent.CanceledException | Exception thrown when trying to send through a PendingIntent that has been canceled or is otherwise no longer able to execute the request. |
