Android 9.0 devloper download

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July 27, I have read and agree with the above terms and conditions Download Android Studio To specify the target, use the devices command to get the serial number of the target. Once you have the serial number, use the -s option with the adb commands to specify the serial number.

In the following example, the list of attached devices is obtained, and then the serial number of one of the devices is used to install the helloWorld. Note: If you issue a command without specifying a target device when multiple devices are available, adb generates an error. If you have multiple devices available, but only one is an emulator, use the -e option to send commands to the emulator. Likewise, if there are multiple devices but only one hardware device attached, use the -d option to send commands to the hardware device.

You can use adb to install an APK on an emulator or connected device with the install command:. You must use the -t option with the install command when you install a test APK. For more information, see -t. Instead, Android Studio handles the packaging and installation of the app for you. You can use the forward command to set up arbitrary port forwarding, which forwards requests on a specific host port to a different port on a device.

The following example sets up forwarding of host port to device port Use the pull and push commands to copy files to and from an device. Unlike the install command, which only copies an APK file to a specific location, the pull and push commands let you copy arbitrary directories and files to any location in a device.

In some cases, you might need to terminate the adb server process and then restart it to resolve the problem e. To stop the adb server, use the adb kill-server command. You can then restart the server by issuing any other adb command. You can issue adb commands from a command line on your development machine or from a script. The usage is:. If there's only one emulator running or only one device connected, the adb command is sent to that device by default.

You can use the shell command to issue device commands through adb, or to start an interactive shell. To issue a single command use the shell command like this:. To start an interactive shell on a device use the shell command like this:. Note: With Android Platform-Tools 23 and higher, adb handles arguments the same way that the ssh 1 command does. But, this change means that the interpretation of any command that contains shell metacharacters has also changed. For example, the adb shell setprop foo 'a b' command is now an error because the single quotes ' are swallowed by the local shell, and the device sees adb shell setprop foo a b.

To make the command work, quote twice, once for the local shell and once for the remote shell, the same as you do with ssh 1. For example, adb shell setprop foo "'a b'". Android provides most of the usual Unix command-line tools. For a list of available tools, use the following command:. Help is available for most of the commands via the --help argument.

Many of the shell commands are provided by toybox. General help applicable to all toybox commands is available via toybox --help. See also Logcat Command-Line Tool which is useful for monitoring the system log. Within an adb shell, you can issue commands with the activity manager am tool to perform various system actions, such as start an activity, force-stop a process, broadcast an intent, modify the device screen properties, and more.

While in a shell, the syntax is:. You can also issue an activity manager command directly from adb without entering a remote shell. See the Specification for intent arguments. Options are: -D : Enable debugging. Prior to each repeat, the top activity will be finished. This command kills only processes that are safe to kill and that will not impact the user experience.

Use with [-e perf true] to generate raw output for performance measurements. Required for test runners. Options are: -w : Wait for debugger when app starts. This command is helpful for testing your app across different screen sizes by mimicking a small screen resolution using a device with a large screen, and vice versa. Example: am display-size x display-density dpi Override device display density. This command is helpful for testing your app across different screen densities on high-density screen environment using a low density screen, and vice versa.

Example: am display-density to-uri intent Print the given intent specification as a URI. Specification for intent arguments For activity manager commands that take an intent argument, you can specify the intent with the following options:. Within an adb shell, you can issue commands with the package manager pm tool to perform actions and queries on app packages installed on the device.

You can also issue a package manager command directly from adb without entering a remote shell. Options: -f : See their associated file. Options: -g : Organize by group. Options: -f : List the APK file for the test package. For example, you could provide a title for the content area of a Fragment object. If your app displays textual content that includes logical headings, set the android:accessibilityHeading attribute to true for the instances of View that represent those headings.

By adding these headings, you allow accessibility services to help users navigate directly from one heading to the next. Any accessibility service can use this capability to improve users' UI navigation experience. Screen readers have traditionally used the android:focusable attribute to determine when they should read a ViewGroup , or a collection of View objects, as a single unit.

That way, users could understand that the views were logically related to each other. This arrangement caused some instances of View to be marked focusable in a way that made keyboard navigation more cumbersome. Starting in Android 9, you can use the android:screenReaderFocusable attribute in place of the android:focusable attribute in situations where making a View object focusable has undesirable consequences.

Screen readers place focus on all elements that have set either android:screenReaderFocusable or android:focusable to true. Android 9 makes it easier to track updates to an app's windows when an app redraws multiple windows simultaneously.

During a multiwindow update, each window produces its own set of events. The getSource method returns the root view of the window associated with each event. If an app has defined accessibility pane titles for its View objects, your service can recognize when the app's UI is updated. For example, the framework can detect when a pane has a new title, or when a pane has disappeared.

To eliminate unintentional rotations, we've added a mode that pins the current orientation even if the device position changes. Users can trigger rotation manually when needed by pressing a button in the system bar. The compatibility impacts for apps are minimal in most cases. However, if your app has any customized rotation behavior or uses any unusual screen orientation settings, you might run into issues that would have gone unnoticed before, when user rotation preference was always set to portrait.

We encourage you to take a look at the rotation behavior in all the key activities of your app and make sure that all of your screen orientation settings are still providing the optimal experience. For more details, see the associated behavior changes. A new rotation mode lets users trigger rotation manually when needed using a button in the system bar. Precomputed Text: The PrecomputedText class improves text-rendering performance by enabling you to compute and cache the required information ahead of time.

It also enables your app to perform text layout off the main thread. Magnifier: The Magnifier class is a platform widget that provides a magnifier API, allowing for a consistent magnifier-feature experience across all apps.

Smart Linkify: Android 9 enhances the TextClassifier class, which leverages machine learning to identify some entities in selected text and suggest actions. For example, TextClassifier can enable your app to detect that the user has selected a phone number. Your app could then suggest that the user make a phone call using that number. The features in TextClassifier replace the functionality of the Linkify class.

Text Layout: Several convenience methods and attributes make it easier to implement your UI design. For details, see the reference documentation for TextView. This change allows your app to start faster and consume less disk space and RAM.

Android 9 allows you to record system traces from your device, then share a report of these recordings with your development team. This report supports multiple formats, including HTML. By collecting these traces, you can capture timing data related to your app's processes and threads and view other types of globally-significant device states. To learn more about this tool, see Perform on-device system tracing.

Content and code samples on this page are subject to the licenses described in the Content License. All Android releases Android 9. Features and APIs. Behavior changes. Android Developers. Testing display cutout by using emulator. MessagingStyle with replies and conversation. Behavior changes. Android Developers. Android 9 Pie Android 9 harnesses the power of artificial intelligence to give you more from your phone. See what's new. Download a system image How to get Android 9 for your Pixel device.

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