Android APIs
Added in API level 1
package

android.content

Contains classes for accessing and publishing data on a device. It includes three main categories of APIs:

    Content sharing (android.content)
    For sharing content between application components. The most important classes are:
    • ContentProvider and ContentResolver for managing and publishing persistent data associated with an application.
    • Intent and IntentFilter, for delivering structured messages between different application components—allowing components to initiate other components and return results.
    Package management (android.content.pm)
    For accessing information about an Android package (an .apk), including information about its activities, permissions, services, signatures, and providers. The most important class for accessing this information is PackageManager.
    Resource management (android.content.res)
    For retrieving resource data associated with an application, such as strings, drawables, media, and device configuration details. The most important class for accessing this data is Resources.

Interfaces

ClipboardManager.OnPrimaryClipChangedListener Defines a listener callback that is invoked when the primary clip on the clipboard changes. 
ComponentCallbacks The set of callback APIs that are common to all application components (Activity, Service, ContentProvider, and Application). 
ComponentCallbacks2 Extended ComponentCallbacks interface with a new callback for finer-grained memory management. 
ContentProvider.PipeDataWriter<T> Interface to write a stream of data to a pipe. 
DialogInterface  
DialogInterface.OnCancelListener Interface used to allow the creator of a dialog to run some code when the dialog is canceled. 
DialogInterface.OnClickListener Interface used to allow the creator of a dialog to run some code when an item on the dialog is clicked.. 
DialogInterface.OnDismissListener Interface used to allow the creator of a dialog to run some code when the dialog is dismissed. 
DialogInterface.OnKeyListener Interface definition for a callback to be invoked when a key event is dispatched to this dialog. 
DialogInterface.OnMultiChoiceClickListener Interface used to allow the creator of a dialog to run some code when an item in a multi-choice dialog is clicked. 
DialogInterface.OnShowListener Interface used to allow the creator of a dialog to run some code when the dialog is shown. 
EntityIterator A specialization of Iterator that allows iterating over a collection of Entity objects. 
IntentSender.OnFinished Callback interface for discovering when a send operation has completed. 
Loader.OnLoadCanceledListener<D> Interface that is implemented to discover when a Loader has been canceled before it finished loading its data. 
Loader.OnLoadCompleteListener<D> Interface that is implemented to discover when a Loader has finished loading its data. 
ServiceConnection Interface for monitoring the state of an application service. 
SharedPreferences Interface for accessing and modifying preference data returned by getSharedPreferences(String, int). 
SharedPreferences.Editor Interface used for modifying values in a SharedPreferences object. 
SharedPreferences.OnSharedPreferenceChangeListener Interface definition for a callback to be invoked when a shared preference is changed. 
SyncStatusObserver  

Classes

AbstractThreadedSyncAdapter An abstract implementation of a SyncAdapter that spawns a thread to invoke a sync operation. 
AsyncQueryHandler A helper class to help make handling asynchronous ContentResolver queries easier. 
AsyncQueryHandler.WorkerArgs  
AsyncQueryHandler.WorkerHandler  
AsyncTaskLoader<D> Abstract Loader that provides an AsyncTask to do the work. 
BroadcastReceiver Base class for code that will receive intents sent by sendBroadcast(). 
BroadcastReceiver.PendingResult State for a result that is pending for a broadcast receiver. 
ClipboardManager Interface to the clipboard service, for placing and retrieving text in the global clipboard. 
ClipData Representation of a clipped data on the clipboard. 
ClipData.Item Description of a single item in a ClippedData. 
ClipDescription Meta-data describing the contents of a ClipData. 
ComponentName Identifier for a specific application component (Activity, Service, BroadcastReceiver, or ContentProvider) that is available. 
ContentProvider Content providers are one of the primary building blocks of Android applications, providing content to applications. 
ContentProviderClient The public interface object used to interact with a ContentProvider. 
ContentProviderOperation  
ContentProviderOperation.Builder Used to add parameters to a ContentProviderOperation. 
ContentProviderResult Contains the result of the application of a ContentProviderOperation. 
ContentQueryMap Caches the contents of a cursor into a Map of String->ContentValues and optionally keeps the cache fresh by registering for updates on the content backing the cursor. 
ContentResolver This class provides applications access to the content model. 
ContentUris Utility methods useful for working with Uri objects that use the "content" (content://) scheme. 
ContentValues This class is used to store a set of values that the ContentResolver can process. 
Context Interface to global information about an application environment. 
ContextWrapper Proxying implementation of Context that simply delegates all of its calls to another Context. 
CursorLoader A loader that queries the ContentResolver and returns a Cursor. 
Entity A representation of a item using ContentValues. 
Entity.NamedContentValues  
Intent An intent is an abstract description of an operation to be performed. 
Intent.FilterComparison Wrapper class holding an Intent and implementing comparisons on it for the purpose of filtering. 
Intent.ShortcutIconResource Represents a shortcut/live folder icon resource. 
IntentFilter Structured description of Intent values to be matched. 
IntentFilter.AuthorityEntry This is an entry for a single authority in the Iterator returned by authoritiesIterator(). 
IntentSender A description of an Intent and target action to perform with it. 
Loader<D> A class that performs asynchronous loading of data. 
Loader.ForceLoadContentObserver An implementation of a ContentObserver that takes care of connecting it to the Loader to have the loader re-load its data when the observer is told it has changed. 
MutableContextWrapper Special version of ContextWrapper that allows the base context to be modified after it is initially set. 
PeriodicSync Value type that contains information about a periodic sync. 
RestrictionEntry Applications can expose restrictions for a restricted user on a multiuser device. 
SearchRecentSuggestionsProvider This superclass can be used to create a simple search suggestions provider for your application. 
SyncAdapterType Value type that represents a SyncAdapterType. 
SyncContext  
SyncInfo Information about the sync operation that is currently underway. 
SyncRequest Convenience class to construct sync requests. 
SyncRequest.Builder Builder class for a @link SyncRequest. 
SyncResult This class is used to communicate the results of a sync operation to the SyncManager. 
SyncStats Used to record various statistics about the result of a sync operation. 
UriMatcher Utility class to aid in matching URIs in content providers. 
UriPermission Description of a single Uri permission grant. 

Exceptions

ActivityNotFoundException This exception is thrown when a call to startActivity(Intent) or one of its variants fails because an Activity can not be found to execute the given Intent. 
IntentFilter.MalformedMimeTypeException This exception is thrown when a given MIME type does not have a valid syntax. 
IntentSender.SendIntentException Exception thrown when trying to send through a PendingIntent that has been canceled or is otherwise no longer able to execute the request. 
OperationApplicationException Thrown when an application of a ContentProviderOperation fails due the specified constraints. 
ReceiverCallNotAllowedException This exception is thrown from registerReceiver(BroadcastReceiver, IntentFilter) and bindService(Intent, ServiceConnection, int) when these methods are being used from an BroadcastReceiver component.