API Level: 21
Android 5.0 (LOLLIPOP) offers new features for users and app developers. This document provides an introduction to the most notable new APIs.
If you have a published app, make sure to check out the Android 5.0 Behavior Changes that you should account for in your app. These behavior changes may affect your app on Android 5.0 devices, even if you are not using new APIs or targeting new functionality.
For a high-level look at the new platform features, instead see the Android Lollipop highlights.
To better optimize your app for devices running Android 5.0,
"21", install your app on an Android
5.0 system image, test it, then publish the updated app with
You can use Android 5.0 APIs while also supporting older
versions by adding conditions to your code that check for the system API level
before executing APIs not supported by your
To learn more about maintaining backward compatibility, read Supporting
Different Platform Versions.
For more information about how API levels work, read What is API Level?
If you have previously published an app for Android, be aware that your app might be affected by changes in Android 5.0.
Please see Android 5.0 Changes for complete information.
Android 5.0 adds support for Android's new material design style. You can create apps with material design that are visually dynamic and have UI element transitions that feel natural to users. This support includes:
To learn more about adding material design functionality to your app, see Material Design.
In previous releases, the
could only display only one task for each app that the user interacted with
most recently. Now your app can open more tasks as needed for additional
concurrent activities for documents. This feature facilitates multitasking by
letting users quickly switch between individual activities and documents from
the recents screen, with a consistent switching experience across all apps.
Examples of such concurrent tasks might include open tabs in a web
browser app, documents in a productivity app, concurrent matches in
a game, or chats in a messaging app. Your app can manage its tasks
To insert a logical break so that the system treats your activity as a new
launching the activity with
startActivity(). You can also get this behavior by setting the
documentLaunchMode attribute to
"always" in your manifest.
To avoid cluttering the recents screen, you can set the maximum number of
tasks from your app that can appear in that screen. To do this, set the
android:maxRecents. The current
maximum that can be specified is 50 tasks per user (25 for low RAM devices).
Tasks in the recents screen can be set to persist across reboots. To control
the persistence behavior, use the
attribute. You can also change
the visual properties of an activity in the recents screen, such as the
activity’s color, label, and icon, by calling the
Android 5.0 updates the
implementation to Chromium M37, bringing security and stability enhancements,
as well as bug fixes. The default user-agent string for a
WebView running on Android 5.0 has
been updated to incorporate 220.127.116.11 as the version number.
This release introduces the
which allows your app to grant the
to access protected resources like the camera and microphone, through web APIs
such as getUserMedia(). Your app must have the appropriate
Android permissions for these resources in order to grant the permissions to the
Android 5.0 lets you add screen capturing and screen sharing capabilities to
your app with the new
android.media.projection APIs. This functionality
is useful, for example, if you want to enable screen sharing in a video
allows your app to capture the contents of the main screen (the default
display) into a
Surface object, which your app can then
send across the network. The API only allows capturing non-secure screen
content, and not system audio. To begin screen capturing, your app must first
request the user’s permission by launching a screen capture dialog using an
Intent obtained through the
For an example of how to use the new APIs, see the
class in the sample project.
Lock screens in Android 5.0 have the ability to present notifications. Users can choose via Settings whether to allow sensitive notification content to be shown over a secure lock screen.
Your app can control the level of detail visible when its notifications are
displayed over the secure lock screen. To control the visibility level, call
specify one of these values:
VISIBILITY_PRIVATE: Shows basic information, such as the notification’s icon, but hides the notification’s full content.
VISIBILITY_PUBLIC: Shows the notification’s full content.
VISIBILITY_SECRET: Shows nothing, excluding even the notification’s icon.
When the visibility level is
you can also provide a redacted version of the notification
content that hides personal details. For example, an SMS app might display a
notification that shows "You have 3 new text messages" but hides the message
content and senders. To provide this alternative notification, first create the
replacement notification using
you create the private notification object, attach the replacement notification
to it through the
Android 5.0 uses metadata associated with your app notifications
to sort the notifications more intelligently. To set the metadata, call the
following methods in
Notification.Builder when you
construct the notification:
setCategory(): Tells the system how to handle your app notifications when the device is in priority mode (for example, if a notification represents an incoming call, instant message, or alarm).
setPriority(): Marks the notification as more or less important than normal notifications. Notifications with the priority field set to
PRIORITY_HIGHappear in a small floating window if the notification also has sound or vibration.
addPerson(): Enables you to add one or more people who are relevant to a notification. Your app can use this to signal to the system that it should group together notifications from the specified people, or rank notifications from these people as being more important.
Android 5.0 adds Java interfaces and native support for OpenGL ES 3.1. Key new functionality provided in OpenGL ES 3.1 includes:
The Java interface for OpenGL ES 3.1 on Android is provided with
GLES31. When using OpenGL ES 3.1, be sure that you
declare it in your manifest file with the
<uses-feature> tag and the
android:glEsVersion attribute. For example:
<manifest> <uses-feature android:glEsVersion="0x00030001" /> ... </manifest>
For more information about using OpenGL ES, including how to check the device’s supported OpenGL ES version at runtime, see the OpenGL ES API guide.
In addition to OpenGL ES 3.1, this release provides an extension pack with
Java interfaces and native support for advanced graphics functionality. These
extensions are treated as a single package by Android. (If the
ANDROID_extension_pack_es31a extension is present, your app can
assume all extensions in the package are present and enable the shading language
features with a single
The extension pack supports:
The Java interface for the extension pack is provided with
GLES31Ext. In your app manifest, you can declare that
your app must be installed only on devices that support the extension pack.
<manifest> <uses-feature android:name=“android.hardware.opengles.aep” android:required="true" /> ... </manifest>
Android 5.0 introduces the new
API to facilitate fine-grain photo capture and image processing. You can now
programmatically access the camera devices available to the system with
and connect to a specific device with
To start capturing images, create a
and specify the
Surface objects to send captured images.
CameraCaptureSession can be configured to
take single shots or multiple images in a burst.
To be notified when new images are captured, implement the
and set it in your capture request. Now when the system completes the image
capture request, your
listener receives a call to
providing you with the image capture metadata in a
CameraCharacteristics class lets your
app detect what camera features are available on a device. The object's
INFO_SUPPORTED_HARDWARE_LEVEL property represents the camera's level of functionality.
INFO_SUPPORTED_HARDWARE_LEVEL_LEGACYhardware level, which has capabilities roughly equivalent to that of the deprecated
INFO_SUPPORTED_HARDWARE_LEVEL_FULLhardware level are capable of manual control of capture and post-processing, and capturing high-resolution images at high frame rates.
To see how to use the updated
API, refer to the
samples in this release.
This release includes the following changes to
ENCODING_PCM_FLOAT). This permits greater dynamic range, more consistent precision, and greater headroom. Floating-point arithmetic is especially useful during intermediate calculations. Playback endpoints use integer format for audio data, and with lower bit depth. (In Android 5.0, portions of the internal pipeline are not yet floating point.)
ByteBuffer, in the same format as provided by
WRITE_NON_BLOCKINGoption can simplify buffering and multithreading for some apps.
Use the new notification and media APIs to ensure that the
system UI knows about your media playback and can extract and show album art.
Controlling media playback across a UI and a service is now easier with the new
MediaSession class replaces
RemoteControlClient class and provides a
single set of callback methods for handling transport controls and media buttons.
If your app provides media playback and runs on the Android
Wear platform, use the
MediaSession class to handle your transport
controls using the same callback methods.
You can now build your own media controller app with the new
MediaController class. This class provides
a thread-safe way to monitor and control media playback from your app's UI process.
When creating a controller, specify a
object so that your app can interact with the given
By using the
you can send commands such as
to control media playback on that session. With the controller, you can also
MediaController.Callback object to
listen for metadata and state changes on the session.
In addition, you can create rich notifications that allow playback control
tied to a media session with the new
Android 5.0 introduces the ability for apps to browse the media content
library of another app, through the new
API. To expose the media content in your app, extend the
MediaBrowserService class. Your implementation of
MediaBrowserService should provide access to a
MediaSession.Token so that apps can play media content
provided through your service.
To interact with a media browser service, use the
MediaBrowser class. Specify the component
name for a
MediaSession when you create an
MediaBrowser instance. Using that browser instance,
your app can then connect to the associated service and obtain a
MediaSession.Token object to play content exposed
through that service.
Android 5.0 extends the Storage Access Framework to let users select an entire directory subtree, giving apps read/write access to all contained documents without requiring user confirmation for each item.
To select a directory subtree, build and send an
intent. The system displays all
DocumentsProvider instances that support subtree selection,
letting the user browse and select a directory. The returned URI represents
access to the selected subtree. You can then use
to explore the subtree.
createDocument() method lets you create new documents or directories anywhere
under the subtree. To manage existing documents, use
to verify provider support for these calls before issuing them.
Android 5.0 also introduces new package-specific directories on
shared storage where your app can place media files for inclusion in
MediaStore. The new
getExternalMediaDirs() returns paths to these
directories on all shared storage devices. Similarly to
no additional permissions are needed by your app to access the returned paths. The
platform periodically scans for new media in these directories, but you can also
MediaScannerConnection to explicitly scan for new
Android 5.0 provides new multi-networking APIs that let your app dynamically scan for available networks with specific capabilities, and establish a connection to them. This functionality is useful when your app requires a specialized network, such as an SUPL, MMS, or carrier-billing network, or if you want to send data using a particular type of transport protocol.
To select and connect to a network dynamically from your app, follow these steps:
NetworkRequest.Builderclass to create an
NetworkRequestobject and specify the network features and transport type your app is interested in.
registerNetworkCallback(), and pass in the
NetworkRequestobject and an implementation of
ConnectivityManager.NetworkCallback. Use the
requestNetwork()method if you want to actively switch to a suitable network once it’s detected; to receive only notifications for scanned networks without actively switching, use the
When the system detects a suitable network, it connects to the network and
callback. You can use the
Network object from the callback to
get additional information about the network, or to direct traffic to use the
Android 4.3 introduced platform support for Bluetooth Low Energy (Bluetooth LE) in the central role. In Android 5.0, an Android device can now act as a Bluetooth LE peripheral device. Apps can use this capability to make their presence known to nearby devices. For instance, you can build apps that allow a device to function as a pedometer or health monitor and communicate its data with another Bluetooth LE device.
android.bluetooth.le APIs enable your apps to broadcast
advertisements, scan for responses, and form connections with nearby Bluetooth
LE devices. To use the new advertising and scanning features, add the
permission in your manifest. When users update or download your app from the Play Store,
they are asked to grant the following permission to your app:
"Bluetooth connection information: Allows the app to control Bluetooth,
including broadcasting to or getting information about nearby Bluetooth devices."
To begin Bluetooth LE advertising so that other devices can discover
your app, call
and pass in an implementation of the
AdvertiseCallback class. The callback object
receives a report of the success or failure of the advertising operation.
Android 5.0 introduces the
ScanFilter class so
that your app can scan for only the
specific types of devices it is interested in. To begin scanning for Bluetooth
LE devices, call
and pass in a list of filters. In the method call, you must also provide an
ScanCallback to report when a
Bluetooth LE advertisement is found.
Android 5.0 adds these enhancements to enable wider and more flexible use of NFC:
invokeBeam(). This avoids the need for the user to manually tap the device against another NFC-capable device to complete the data transfer.
createTextRecord()method to create an NDEF record containing UTF-8 text data.
registerAidsForService(). You can also use
setPreferredService()to set the preferred card emulation service that should be used when a specific activity is in the foreground.
In addition to new features, Android 5.0 emphasizes improvements in battery life. Use the new APIs and tool to understand and optimize your app’s power consumption.
Android 5.0 provides a new
API that lets you optimize battery life by defining jobs for the system to run
asynchronously at a later time or under specified conditions (such as when the
device is charging). Job scheduling is useful in such situations as:
A unit of work is encapsulated by a
This object specifies the scheduling criteria.
JobInfo.Builder class to configure how the
scheduled task should run. You can schedule the task to run under specific
conditions, such as:
For example, you can add code like this to run your task on an unmetered network:
JobInfo uploadTask = new JobInfo.Builder(mJobId, mServiceComponent /* JobService component */) .setRequiredNetworkCapabilities(JobInfo.NetworkType.UNMETERED) .build(); JobScheduler jobScheduler = (JobScheduler) context.getSystemService(Context.JOB_SCHEDULER_SERVICE); jobScheduler.schedule(uploadTask);
If the device has stable power (that is, it has been plugged in for more than 2 minutes and the battery is at a healthy level), the system will run any scheduled job that is ready to run, even if the job’s deadline has not expired.
To see an example of how to use the
refer to the
JobSchedulerSample implementation sample in this release.
dumpsys batterystats command generates interesting
statistical data about battery usage on a device, organized by unique user ID
(UID). The statistics include:
--help option to learn about the various options for
tailoring the output. For example, to print battery usage
statistics for a given app package since the device was last charged, run this
$ adb shell dumpsys batterystats --charged <package-name>
You can use the
tool on the output of the
dumpsys command to
generate an HTML visualization of power-related events from the logs. This
information makes it easier for you to understand and diagnose any battery
Android 5.0 provides new functionality for running apps within an enterprise environment. A device administrator can initiate a managed provisioning process to add a copresent but separate managed profile to a device, if the user has an existing personal account. Apps that are associated with managed profiles appear alongside non-managed apps in the user’s Launcher, recents screen, and notifications.
To start the managed provisioning process, send
ACTION_PROVISION_MANAGED_PROFILE in an
Intent. If the
call is successful, the system triggers the
You can then call
enable this managed profile.
By default, only a small subset of apps are enabled in the managed profile.
You can install additional apps in the managed profile by calling
If you are developing a Launcher app, you can use the new
LauncherApps class to get a list of launchable activities
for the current user and any associated managed profiles. Your Launcher can make
the managed apps visually prominent by appending a work badge to the icon
drawable. To retrieve the badged icon, call
To see how to use the new functionality, refer to the
BasicManagedProfile implementation sample in this release.
Android 5.0 introduces the ability to deploy a device owner app. A device
owner is a specialized type of
that has the additional ability to create and remove secondary users and to
configure global settings on the device. Your device owner app can use the
methods in the
DevicePolicyManager class to take
fine-grain control of the configuration, security, and apps on managed devices.
A device can have only one active device owner at a time.
To deploy and activate a device owner, you must perform an NFC data transfer from a programming app to the device while the device is in its unprovisioned state. This data transfer sends the same information as in the provisioning intent described in Managed provisioning.
Android 5.0 introduces a new screen pinning API that lets you temporarily restrict users from leaving your task or being interrupted by notifications. This could be used, for example, if you are developing an education app to support high stakes assessment requirements on Android, or a single-purpose or kiosk application. Once your app activates screen pinning, users cannot see notifications, access other apps, or return to the home screen, until your app exits the mode.
There are two ways to activate screen pinning:
startLockTask()from your app. If the requesting app is not a device owner, the user is prompted for confirmation. A device owner app can call the
setLockTaskPackages()method to enable apps to be pinnable without the user confirmation step.
When task locking is active, the following behavior happens:
You can now render PDF document pages into bitmap images for printing by
using the new
PdfRenderer class. You must specify a
ParcelFileDescriptor that is seekable (that is, the content
can be randomly accessed) on which the system writes the the printable content.
Your app can obtain a page for rendering with
openPage(), then call
to turn the opened
PdfRenderer.Page into a bitmap. You
can also set additional parameters if you only want to convert a portion of the
document into a bitmap image (for example, to implement
to zoom in on the document).
For an example of how to use the new APIs, see the
You can now access app usage history on an Android device with the
android.app.usage API. This API provides more detailed usage
information than the deprecated
To use this API, you must first declare the
"android.permission.PACKAGE_USAGE_STATS" permission in your manifest.
The user must also enable access for this app through Settings > Security > Apps
with usage access.
The system collects the usage data on a per-app basis, aggregating the data over daily, weekly, monthly, and yearly intervals. The maximum duration that the system keeps this data is as follows:
For each app, the system records the following data:
Android 5.0 adds the following support for testing and accessibility:
getWindowContentFrameStats()methods capture frame statistics for window animations and content. These methods let you write instrumentation tests to evaluate whether an app is rendering frames at a sufficient refresh frequency to provide a smooth user experience.
executeShellCommand()method lets you execute shell commands from your instrumentation test. The command execution is similar to running
adb shellfrom a host connected to the device, allowing you to use shell-based tools such as
UiAutomator) can now retrieve detailed information about the properties of windows on the screen that sighted users can interact with. To retrieve a list of
AccessibilityWindowInfoobjects, call the new
AccessibilityNodeInfo.AccessibilityActionclass lets you define standard or customized actions to perform on an
AccessibilityNodeInfo. The new
AccessibilityNodeInfo.AccessibilityActionclass replaces the actions-related APIs previously found in
Voiceclass allows your app to use voice profiles associated with specific locales, quality and latency rating, and text-to-speech engine-specific parameters.
Beginning in Android 5.0, users can more easily switch between
method editors (IME) supported by the platform. Performing the designated
switching action (usually touching a Globe icon on the soft keyboard) cycles
through all such IMEs. This change in behavior is implemented by the
In addition, the framework now checks whether the next IME includes a
switching mechanism at all (and, thus, whether that IME supports switching to
the IME after it). An
IME with a switching mechanism will not cycle to an IME without one. This
change in behavior is implemented by the
To see an example of how to use the updated IME-switching APIs, refer to the updated soft-keyboard implementation sample in this release. To learn more about how to implement switching between IMEs, see Creating an Input Method.
The following values are now supported in the
element, so you can ensure that your app is installed only on devices that
provide the features your app needs.
The following permission is now supported in the
element to declare the permissions your app requires to access certain APIs.
BIND_DREAM_SERVICE: When targeting API level 21 and higher, this permission is required by a Daydream service, to ensure that only the system can bind to it.