Context

Use with getSystemService(String) to retrieve a ActivityManager for interacting with the global system state.

Use with getSystemService(String) to retrieve a AlarmManager for receiving intents at a time of your choosing.

Use with getSystemService(String) to retrieve a AudioManager for handling management of volume, ringer modes and audio routing.

Flag for bindService(Intent, ServiceConnection, int): automatically create the service as long as the binding exists. Note that while this will create the service, its onStart(Intent, int) method will still only be called due to an explicit call to startService(Intent). Even without that, though, this still provides you with access to the service object while the service is created.

Specifying this flag also tells the system to treat the service as being as important as your own process -- that is, when deciding which process should be killed to free memory, the service will only be considered a candidate as long as the processes of any such bindings is also a candidate to be killed. This is to avoid situations where the service is being continually created and killed due to low memory.

Flag for bindService(Intent, ServiceConnection, int): include debugging help for mismatched calls to unbind. When this flag is set, the callstack of the following unbindService(ServiceConnection) call is retained, to be printed if a later incorrect unbind call is made. Note that doing this requires retaining information about the binding that was made for the lifetime of the app, resulting in a leak -- this should only be used for debugging.

Use with getSystemService(String) to retrieve a ClipboardManager for accessing and modifying the contents of the global clipboard.

Use with getSystemService(String) to retrieve a ConnectivityManager for handling management of network connections.

Flag for use with createPackageContext(String, int): ignore any security restrictions on the Context being requested, allowing it to always be loaded. For use with CONTEXT_INCLUDE_CODE to allow code to be loaded into a process even when it isn't safe to do so. Use with extreme care!

Flag for use with createPackageContext(String, int): include the application code with the context. This means loading code into the caller's process, so that getClassLoader() can be used to instantiate the application's classes. Setting this flags imposes security restrictions on what application context you can access; if the requested application can not be safely loaded into your process, java.lang.SecurityException will be thrown. If this flag is not set, there will be no restrictions on the packages that can be loaded, but getClassLoader() will always return the default system class loader.

Use with getSystemService(String) to retrieve a InputMethodManager for accessing input methods.

Use with getSystemService(String) to retrieve a NotificationManager for controlling keyguard.

Use with getSystemService(String) to retrieve a LayoutInflater for inflating layout resources in this context.

Use with getSystemService(String) to retrieve a LocationManager for controlling location updates.

File creation mode: for use with openFileOutput(String, int), if the file already exists then write data to the end of the existing file instead of erasing it.

File creation mode: the default mode, where the created file can only be accessed by the calling application (or all applications sharing the same user ID).

File creation mode: allow all other applications to have read access to the created file.

File creation mode: allow all other applications to have write access to the created file.

Use with getSystemService(String) to retrieve a NotificationManager for informing the user of background events.

Use with getSystemService(String) to retrieve a PowerManager for controlling power management, including "wake locks," which let you keep the device on while you're running long tasks.

Use with getSystemService(String) to retrieve a SearchManager for handling searches.

Use with getSystemService(String) to retrieve a SensorManager for accessing sensors.

Use with getSystemService(String) to retrieve a TelephonyManager for handling management the telephony features of the device.

Use with getSystemService(String) to retrieve a Vibrator for interacting with the vibration hardware.

Use with getSystemService(String) to retrieve a com.android.server.WallpaperService for accessing wallpapers.

Use with getSystemService(String) to retrieve a WifiManager for handling management of Wi-Fi access.

Use with getSystemService(String) to retrieve a WindowManager for accessing the system's window manager.

Connect to an application service, creating it if needed. This defines a dependency between your application and the service. The given conn will receive the service object when its created and be told if it dies and restarts. The service will be considered required by the system only for as long as the calling context exists. For example, if this Context is an Activity that is stopped, the service will not be required to continue running until the Activity is resumed.

This function will throw SecurityException if you do not have permission to bind to the given service.

Note: this method can not be called from an BroadcastReceiver component. A pattern you can use to communicate from an BroadcastReceiver to a Service is to call startService(Intent) with the arguments containing the command to be sent, with the service calling its stopSelf(int) method when done executing that command. See the API demo App/Service/Service Start Arguments Controller for an illustration of this. It is okay, however, to use this method from an BroadcastReceiver that has been registered with registerReceiver(BroadcastReceiver, IntentFilter), since the lifetime of this BroadcastReceiver is tied to another object (the one that registered it).

Determine whether the calling process of an IPC or you have been granted a particular permission. This is the same as checkCallingPermission(String), except it grants your own permissions if you are not currently processing an IPC. Use with care!

Determine whether the calling process of an IPC or you has been granted permission to access a specific URI. This is the same as checkCallingUriPermission(Uri, int), except it grants your own permissions if you are not currently processing an IPC. Use with care!

Determine whether the calling process of an IPC you are handling has been granted a particular permission. This is basically the same as calling checkPermission(String, int, int) with the pid and uid returned by getCallingPid() and getCallingUid(). One important difference is that if you are not currently processing an IPC, this function will always fail. This is done to protect against accidentally leaking permissions; you can use checkCallingOrSelfPermission(String) to avoid this protection.

Determine whether the calling process and user ID has been granted permission to access a specific URI. This is basically the same as calling checkUriPermission(Uri, int, int, int) with the pid and uid returned by getCallingPid() and getCallingUid(). One important difference is that if you are not currently processing an IPC, this function will always fail.

Determine whether the given permission is allowed for a particular process and user ID running in the system.

Determine whether a particular process and user ID has been granted permission to access a specific URI. This only checks for permissions that have been explicitly granted -- if the given process/uid has more general access to the URI's content provider then this check will always fail.

Check both a Uri and normal permission. This allows you to perform both checkPermission(String, int, int) and checkUriPermission(Uri, int, int, int) in one call.

Remove any currently set wallpaper, reverting to the system's default wallpaper. On success, the intent ACTION_WALLPAPER_CHANGED is broadcast.

Return a new Context object for the given application name. This Context is the same as what the named application gets when it is launched, containing the same resources and class loader. Each call to this method returns a new instance of a Context object; Context objects are not shared, however they share common state (Resources, ClassLoader, etc) so the Context instance itself is fairly lightweight.

Throws PackageManager.NameNotFoundException if there is no application with the given package name.

Throws SecurityException if the Context requested can not be loaded into the caller's process for security reasons (see CONTEXT_INCLUDE_CODE for more information}.

Returns an array of strings naming the private databases associated with this Context's application package.

Delete an existing private SQLiteDatabase associated with this Context's application package.

Delete the given private file associated with this Context's application package.

If neither you nor the calling process of an IPC you are handling has been granted a particular permission, throw a SecurityException. This is the same as enforceCallingPermission(String, String), except it grants your own permissions if you are not currently processing an IPC. Use with care!

If the calling process of an IPC or you has not been granted permission to access a specific URI, throw SecurityException. This is the same as enforceCallingUriPermission(Uri, int, String), except it grants your own permissions if you are not currently processing an IPC. Use with care!

If the calling process of an IPC you are handling has not been granted a particular permission, throw a SecurityException. This is basically the same as calling enforcePermission(String, int, int, String) with the pid and uid returned by getCallingPid() and getCallingUid(). One important difference is that if you are not currently processing an IPC, this function will always throw the SecurityException. This is done to protect against accidentally leaking permissions; you can use enforceCallingOrSelfPermission(String, String) to avoid this protection.

If the calling process and user ID has not been granted permission to access a specific URI, throw SecurityException. This is basically the same as calling enforceUriPermission(Uri, int, int, int, String) with the pid and uid returned by getCallingPid() and getCallingUid(). One important difference is that if you are not currently processing an IPC, this function will always throw a SecurityException.

If the given permission is not allowed for a particular process and user ID running in the system, throw a SecurityException.

If a particular process and user ID has not been granted permission to access a specific URI, throw SecurityException. This only checks for permissions that have been explicitly granted -- if the given process/uid has more general access to the URI's content provider then this check will always fail.

Enforce both a Uri and normal permission. This allows you to perform both enforcePermission(String, int, int, String) and enforceUriPermission(Uri, int, int, int, String) in one call.

Returns an array of strings naming the private files associated with this Context's application package.

Return the context of the single, global Application object of the current process.

Return an AssetManager instance for your application's package.

Returns the absolute path to the application specific cache directory on the filesystem. These files will be ones that get deleted first when the device runs low on storage There is no guarantee when these files will be deleted.

Return a class loader you can use to retrieve classes in this package.

Return a ContentResolver instance for your application's package.

Returns the absolute path on the filesystem where a database created with openOrCreateDatabase(String, int, SQLiteDatabase.CursorFactory) is stored.

Retrieve, creating if needed, a new directory in which the application can place its own custom data files. You can use the returned File object to create and access files in this directory. Note that files created through a File object will only be accessible by your own application; you can only set the mode of the entire directory, not of individual files.

Returns the absolute path on the filesystem where a file created with openFileOutput(String, int) is stored.

Returns the absolute path to the directory on the filesystem where files created with openFileOutput(String, int) are stored.

Return the Looper for the main thread of the current process. This is the thread used to dispatch calls to application components (activities, services, etc).

Return PackageManager instance to find global package information.

Return the name of this application's package.

Return a Resources instance for your application's package.

Retrieve and hold the contents of the preferences file 'name', returning a SharedPreferences through which you can retrieve and modify its values. Only one instance of the SharedPreferences object is returned to any callers for the same name, meaning they will see each other's edits as soon as they are made.

Return a localized formatted string from the application's package's default string table, substituting the format arguments as defined in Formatter and format(String, Object...).

Return a localized string from the application's package's default string table.

Return the handle to a system-level service by name. The class of the returned object varies by the requested name. Currently available names are:

WINDOW_SERVICE ("window")

The top-level window manager in which you can place custom windows. The returned object is a WindowManager.

LAYOUT_INFLATER_SERVICE ("layout_inflater")

A LayoutInflater for inflating layout resources in this context.

ACTIVITY_SERVICE ("activity")

A ActivityManager for interacting with the global activity state of the system.

POWER_SERVICE ("power")

A PowerManager for controlling power management.

ALARM_SERVICE ("alarm")

A AlarmManager for receiving intents at the time of your choosing.

NOTIFICATION_SERVICE ("notification")

A NotificationManager for informing the user of background events.

KEYGUARD_SERVICE ("keyguard")

A KeyguardManager for controlling keyguard.

LOCATION_SERVICE ("location")

A LocationManager for controlling location (e.g., GPS) updates.

SEARCH_SERVICE ("search")

A SearchManager for handling search.

VIBRATOR_SERVICE ("vibrator")

A Vibrator for interacting with the vibrator hardware.

CONNECTIVITY_SERVICE ("connection")

A ConnectivityManager for handling management of network connections.

WIFI_SERVICE ("wifi")

A WifiManager for management of Wi-Fi connectivity.

INPUT_METHOD_SERVICE ("input_method")

An InputMethodManager for management of input methods.

Note: System services obtained via this API may be closely associated with the Context in which they are obtained from. In general, do not share the service objects between various different contexts (Activities, Applications, Services, Providers, etc.)

Return a localized, styled CharSequence from the application's package's default string table.

Return the Theme object associated with this Context.

Like peekWallpaper(), but always returns a valid Drawable. If no wallpaper is set, the system default wallpaper is returned.

Returns the desired minimum height for the wallpaper. Callers of setWallpaper(android.graphics.Bitmap) or setWallpaper(java.io.InputStream) should check this value beforehand to make sure the supplied wallpaper respects the desired minimum height. If the returned value is <= 0, the caller should use the height of the default display instead.

Returns the desired minimum width for the wallpaper. Callers of setWallpaper(android.graphics.Bitmap) or setWallpaper(java.io.InputStream) should check this value beforehand to make sure the supplied wallpaper respects the desired minimum width. If the returned value is <= 0, the caller should use the width of the default display instead.

Grant permission to access a specific Uri to another package, regardless of whether that package has general permission to access the Uri's content provider. This can be used to grant specific, temporary permissions, typically in response to user interaction (such as the user opening an attachment that you would like someone else to display).

Normally you should use Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION with the Intent being used to start an activity instead of this function directly. If you use this function directly, you should be sure to call revokeUriPermission(Uri, int) when the target should no longer be allowed to access it.

To succeed, the content provider owning the Uri must have set the grantUriPermissions attribute in its manifest or included the <grant-uri-permissions> tag.

Retrieve styled attribute information in this Context's theme. See obtainStyledAttributes(int, int[]) for more information.

Retrieve styled attribute information in this Context's theme. See obtainStyledAttributes(AttributeSet, int[], int, int) for more information.

Retrieve styled attribute information in this Context's theme. See obtainStyledAttributes(int[]) for more information.

Retrieve styled attribute information in this Context's theme. See obtainStyledAttributes(AttributeSet, int[], int, int) for more information.

Open a private file associated with this Context's application package for reading.

Open a private file associated with this Context's application package for writing. Creates the file if it doesn't already exist.

Open a new private SQLiteDatabase associated with this Context's application package. Create the database file if it doesn't exist.

Retrieve the current system wallpaper. This is returned as an abstract Drawable that you can install in a View to display whatever wallpaper the user has currently set. If there is no wallpaper set, a null pointer is returned.

Register to receive intent broadcasts, to run in the context of scheduler. See registerReceiver(BroadcastReceiver, IntentFilter) for more information. This allows you to enforce permissions on who can broadcast intents to your receiver, or have the receiver run in a different thread than the main application thread.

See BroadcastReceiver for more information on Intent broadcasts.

Register a BroadcastReceiver to be run in the main activity thread. The receiver will be called with any broadcast Intent that matches filter, in the main application thread.

The system may broadcast Intents that are "sticky" -- these stay around after the broadcast as finished, to be sent to any later registrations. If your IntentFilter matches one of these sticky Intents, that Intent will be returned by this function and sent to your receiver as if it had just been broadcast.

There may be multiple sticky Intents that match filter, in which case each of these will be sent to receiver. In this case, only one of these can be returned directly by the function; which of these that is returned is arbitrarily decided by the system.

If you know the Intent your are registering for is sticky, you can supply null for your receiver. In this case, no receiver is registered -- the function simply returns the sticky Intent that matches filter. In the case of multiple matches, the same rules as described above apply.

See BroadcastReceiver for more information on Intent broadcasts.

Note: this method cannot be called from a BroadcastReceiver component; that is, from a BroadcastReceiver that is declared in an application's manifest. It is okay, however, to call this method from another BroadcastReceiver that has itself been registered at run time with registerReceiver(BroadcastReceiver, IntentFilter), since the lifetime of such a registered BroadcastReceiver is tied to the object that registered it.

Remove the data previously sent with sendStickyBroadcast(Intent), so that it is as if the sticky broadcast had never happened.

You must hold the BROADCAST_STICKY permission in order to use this API. If you do not hold that permission, SecurityException will be thrown.

Remove all permissions to access a particular content provider Uri that were previously added with grantUriPermission(String, Uri, int). The given Uri will match all previously granted Uris that are the same or a sub-path of the given Uri. That is, revoking "content://foo/one" will revoke both "content://foo/target" and "content://foo/target/sub", but not "content://foo".

Broadcast the given intent to all interested BroadcastReceivers. This call is asynchronous; it returns immediately, and you will continue executing while the receivers are run. No results are propagated from receivers and receivers can not abort the broadcast. If you want to allow receivers to propagate results or abort the broadcast, you must send an ordered broadcast using sendOrderedBroadcast(Intent, String).

See BroadcastReceiver for more information on Intent broadcasts.

Broadcast the given intent to all interested BroadcastReceivers, allowing an optional required permission to be enforced. This call is asynchronous; it returns immediately, and you will continue executing while the receivers are run. No results are propagated from receivers and receivers can not abort the broadcast. If you want to allow receivers to propagate results or abort the broadcast, you must send an ordered broadcast using sendOrderedBroadcast(Intent, String).

See BroadcastReceiver for more information on Intent broadcasts.

Version of sendBroadcast(Intent) that allows you to receive data back from the broadcast. This is accomplished by supplying your own BroadcastReceiver when calling, which will be treated as a final receiver at the end of the broadcast -- its onReceive(Context, Intent) method will be called with the result values collected from the other receivers. If you use an resultReceiver with this method, then the broadcast will be serialized in the same way as calling sendOrderedBroadcast(Intent, String).

Like sendBroadcast(Intent), this method is asynchronous; it will return before resultReceiver.onReceive() is called.

See BroadcastReceiver for more information on Intent broadcasts.

Broadcast the given intent to all interested BroadcastReceivers, delivering them one at a time to allow more preferred receivers to consume the broadcast before it is delivered to less preferred receivers. This call is asynchronous; it returns immediately, and you will continue executing while the receivers are run.

See BroadcastReceiver for more information on Intent broadcasts.

Perform a sendBroadcast(Intent) that is "sticky," meaning the Intent you are sending stays around after the broadcast is complete, so that others can quickly retrieve that data through the return value of registerReceiver(BroadcastReceiver, IntentFilter). In all other ways, this behaves the same as sendBroadcast(Intent).

You must hold the BROADCAST_STICKY permission in order to use this API. If you do not hold that permission, SecurityException will be thrown.

Set the base theme for this context. Note that this should be called before any views are instantiated in the Context (for example before calling setContentView(View) or inflate(int, ViewGroup)).

Change the current system wallpaper to a specific byte stream. The give InputStream is copied into persistent storage and will now be used as the wallpaper. Currently it must be either a JPEG or PNG image. On success, the intent ACTION_WALLPAPER_CHANGED is broadcast.

Change the current system wallpaper to a bitmap. The given bitmap is converted to a PNG and stored as the wallpaper. On success, the intent ACTION_WALLPAPER_CHANGED is broadcast.

Launch a new activity. You will not receive any information about when the activity exits.

Note that if this method is being called from outside of an Activity Context, then the Intent must include the FLAG_ACTIVITY_NEW_TASK launch flag. This is because, without being started from an existing Activity, there is no existing task in which to place the new activity and thus it needs to be placed in its own separate task.

This method throws ActivityNotFoundException if there was no Activity found to run the given Intent.

Start executing an Instrumentation class. The given Instrumentation component will be run by killing its target application (if currently running), starting the target process, instantiating the instrumentation component, and then letting it drive the application.

This function is not synchronous -- it returns as soon as the instrumentation has started and while it is running.

Instrumentation is normally only allowed to run against a package that is either unsigned or signed with a signature that the the instrumentation package is also signed with (ensuring the target trusts the instrumentation).

Request that a given application service be started. The Intent can either contain the complete class name of a specific service implementation to start, or an abstract definition through the action and other fields of the kind of service to start. If this service is not already running, it will be instantiated and started (creating a process for it if needed); if it is running then it remains running.

Every call to this method will result in a corresponding call to the target service's onStart(Intent, int) method, with the intent given here. This provides a convenient way to submit jobs to a service without having to bind and call on to its interface.

Using startService() overrides the default service lifetime that is managed by bindService(Intent, ServiceConnection, int): it requires the service to remain running until stopService(Intent) is called, regardless of whether any clients are connected to it. Note that calls to startService() are not nesting: no matter how many times you call startService(), a single call to stopService(Intent) will stop it.

The system attempts to keep running services around as much as possible. The only time they should be stopped is if the current foreground application is using so many resources that the service needs to be killed. If any errors happen in the service's process, it will automatically be restarted.

This function will throw SecurityException if you do not have permission to start the given service.

Request that a given application service be stopped. If the service is not running, nothing happens. Otherwise it is stopped. Note that calls to startService() are not counted -- this stops the service no matter how many times it was started.

Note that if a stopped service still has ServiceConnection objects bound to it with the BIND_AUTO_CREATE set, it will not be destroyed until all of these bindings are removed. See the Service documentation for more details on a service's lifecycle.

This function will throw SecurityException if you do not have permission to stop the given service.

Disconnect from an application service. You will no longer receive calls as the service is restarted, and the service is now allowed to stop at any time.

Unregister a previously registered BroadcastReceiver. All filters that have been registered for this BroadcastReceiver will be removed.