Android api docs download

This sample shows how to implement an audio media app that works across multiple form factors and provide a consistent user experience on Android phones, tablets, Auto, Wear and Cast devices.

Samples for Android Architecture Components. A collection of samples to discuss and showcase different architectural tools and patterns for Android apps. A collection of samples demonstrating different frameworks and techniques for automated testing. A fun to play quiz that showcases material design on Android. This set of libraries provides APIs for essential app architecture tasks like lifecycle management and data persistence, so you can write modular apps with less boilerplate code.

Learn more. The Android Support Library offers backward-compatible versions of a number of features, including others not built into the framework. The Data Binding Library enables you to write declarative layouts. Android Test helps you build and run test code for your app.

There are also two new behaviors that you can enable on a per-directory basis to control how the system frees up your cached data:. Finally, when you need to allocate disk space for large files, consider using the new allocateBytes FileDescriptor, long API, which will automatically clear cached files belonging to other apps as needed to meet your request.

When deciding if the device has enough disk space to hold your new data, call getAllocatableBytes UUID instead of using getUsableSpace , since the former will consider any cached data that the system is willing to clear on your behalf.

We've updated content providers to include support for loading a large dataset one page at a time. For example, a photo app with many thousands of images can query for a subset of the data to present in a page. Each page of results returned by a content provider is represented by a single Cursor object. Both a client and a provider must implement paging to make use of this feature. For detailed information about the changes to content providers, see ContentProvider and ContentProviderClient.

The ContentProvider and ContentResolver classes now each include a refresh method, making it easier for clients to know whether the information they request is up-to-date.

You can add custom content refreshing logic by extending ContentProvider. Make sure that you override the refresh method to return true , indicating to your provider's clients that you've attempted to refresh the data yourself. Your client app can explicitly request refreshed content by calling a different method, also called refresh. When calling this method, pass in the URI of the data to refresh. Note: Because you may be requesting data over a network, you should invoke refresh from the client side only when there's a strong indication that the content is stale.

The most common reason to perform this type of content refresh is in response to a swipe-to-refresh gesture, explicitly requesting the current UI to display up-to-date content. These improvements make it easier for your app to comply with the new background execution limits , since you can generally use scheduled jobs to replace the now-restricted background services or implicit broadcast receivers.

Updates to JobScheduler include:. For more information about implementing the data store, refer to Custom Data Store. There is a new VolumeShaper class. Use it to perform short automated volume transitions like fade-ins, fade-outs, and cross fades.

See Controlling Amplitude with VolumeShaper to learn more. Audio apps share the audio output on a device by requesting and abandoning audio focus.

An app handles changes in focus by starting or stopping playback, or ducking its volume. There is a new AudioFocusRequest class. Using this class as the parameter of requestAudioFocus , apps have new capabilites when handling changes in audio focus: automatic ducking and delayed focus gain. A new getMetrics method returns a PersistableBundle object containing configuration and performance information, expressed as a map of attributes and values.

The getMetrics method is defined for these media classes:. Metrics are collected separately for each instance and persist for the lifetime of the instance. If no metrics are available the method returns null. The actual metrics returned depend on the class. It includes a second parameter that specifies a seek mode:.

Metadata can be useful for offline processing. For example, gyro signals from the sensor could be used to perform video stabilization. Instead, the app passes a ByteBuffer with an associated timestamp to the writeSampleData method. The timestamp must be in the same time base as the video and audio tracks.

When using MediaExtractor to extract the file with metadata track, the mime format of the metadata will be extracted into MediaFormat. In fact, a documents provider can even provide access to files that reside on network storage or that use a protocol like Media Transfer Protocol MTP. The SAF can open a file to get a native seekable file descriptor. The SAF then delivers discrete bytes requests to the documents provider. This feature allows a documents provider to return the exact range of bytes that a media player app has requested instead of caching the entire file in advance.

To use this feature, you need to call the new StorageManager. The SAF invokes the callback any time a client application performs file operations on the file descriptor returned from the documents provider.

However, because the returned URI is backed by a DocumentsProvider , media collection managers can access the document directly, without having to traverse trees of scoped directories.

As a result, the media managers can perform file operations on the document significantly more quickly. Caution: The getDocumentUri method only locates media files; it doesn't grant apps permission to access those files. To learn more about how to obtain access permission to media files, see the reference documentation.

When using the Storage Access Framework in Android 8. The method returns this path in a DocumentsContract. On the Application page, set Compile using Android version Target Framework to the latest stable API version or, at a minimum, to the Android version that has all of the features you need.

In the following screenshot, the Target Framework is set to Android 7. If you want to maintain backward compatibility with an earlier version of Android, set Minimum Android version to target to the oldest version of Android that you want your app to support.

Set Target framework to the latest stable API version or, at a minimum, to the Android version that has all of the features you need. In the following screenshot, the Target Framework is set to Use the latest installed platform 8. Set the Minimum Android version to Automatic - use target framework version and set the Target Android version to the same value as the Target Framework version.

In the following screenshot, the Target Android Framework is set to Android 8. If you want to maintain backward compatibility with an earlier version of Android, change Minimum Android version to the oldest version of Android that you want your app to support. If your app supports multiple Android versions, your code must include runtime checks to ensure that your app works with the Minimum Android version setting see Runtime Checks for Android Versions below for details.

As the Android platform evolves and new Android versions are released, each Android version is assigned a unique integer identifier, called the API Level.

Because users install apps on older as well as the most recent versions of Android, real-world Android apps must be designed to work with multiple Android API levels. An Android code name may correspond to multiple versions and API levels as seen in the table below , but each Android version corresponds to exactly one API level. In addition, Xamarin. Android defines build version codes that map to the currently known Android API levels.

The following table can help you translate between API level, Android version, code name, and Xamarin. Android build version code build version codes are defined in the Android. OS namespace :. As this table indicates, new Android versions are released frequently — sometimes more than one release per year. As a result, the universe of Android devices that might run your app includes of a wide variety of older and newer Android versions.

How can you guarantee that your app will run consistently and reliably on so many different versions of Android?

Android's API levels can help you manage this problem. The API level precisely identifies the version of the API set that your app can call into; it identifies the combination of manifest elements, permissions, etc. Android's system of API levels helps Android determine whether an application is compatible with an Android system image prior to installing the application on a device.

These settings are used to ensure that the functionality needed to run the app correctly is available on the Android device at installation time. If not, the app is blocked from running on that device. For example, if the API level of an Android device is lower than the minimum API level that you specify for your app, the Android device will prevent the user from installing your app. The following sections explain how to use the SDK Manager to prepare your development environment for the API levels you want to target, followed by detailed explanations of how to configure Target Framework , Minimum Android version , and Target Android version settings in Xamarin.

This setting specifies what APIs your app expects to use when it runs, but it has no effect on which APIs are actually available to your app when it is installed. As a result, changing the Target Framework setting does not change runtime behavior. The Target Framework identifies which library versions your application is linked against — this setting determines which APIs you can use in your app.

For example, if you want to use the NotificationBuilder. Thanks for fixing it, I zoned out. Deepak Bala Deepak Bala The Overflow Blog. Who owns this outage? Building intelligent escalation chains for modern SRE. Podcast Who is building clouds for the independent developer? Featured on Meta. Now live: A fully responsive profile. Reducing the weight of our footer. Visit chat.