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Game best practices. Maximize device availability. Art assets. OpenGL and Vulkan. Game Mode. Best practices. Building effective unit tests. Automating UI tests. Testing app component integrations. Android Vitals. Optimizing for Battery Life. System tracing. Build and test apps for accessibility.
Advanced topics. Protecting against security threats with SafetyNet. Build for Billions. Build for Enterprise. App feedback. Device management. Dedicated devices. Android versions. Android Developers. Any that are not declared there will not be seen by the system and will never be run.
Particularly in the case where the child lives in a container such as a Display owned by another activity. For example, activities that are used for Wear custom notifications must declare this so Wear can display the activity in it's context stream, which resides in another process. This attribute is meaningful only for the root activity of a task; it's ignored for all other activities.
If true , the task is automatically removed from the overview screen. It must be a boolean value, either " true " or " false ". This attribute is meaningful only for activities that start a new task the root activity ; it's ignored for all other activities in the task. When a configuration change occurs at runtime, the activity is shut down and restarted by default, but declaring a configuration with this attribute will prevent the activity from being restarted.
Instead, the activity remains running and its onConfigurationChanged method is called. Value Description " density " The display density has changed — the user might have specified a different display scale, or a different display might now be active.
Added in API level This should never normally happen. Added in API level 8. The default value is "false". This attribute permits the user to have multiple documents from the same application appear in the overview screen. This attribute has four values which produce the following effects when the user opens a document with the application: Value Description " intoExisting " The system searches for a task whose base intent's ComponentName and data URI match those of the launching intent.
If the system finds such a task, the system clears the task, and restarts with the root activity receiving a call to onNewIntent android. If the system does not find such a task, the system creates a new task.
The overview screen treats the activity as it would by default: it displays a single task for the app, which resumes from whatever activity the user last invoked. The default value is " true ". That is, when this activity is the root activity of a new task, this attribute determines whether the task should not appear in the list of recent apps. Set " true " if the task should be excluded from the list; set " false " if it should be included.
If " false ", the activity can be launched only by components of the same application, applications with the same user ID, or privileged system components. This is the default value when there are no intent filters. The icon is displayed to users when a representation of the activity is required on-screen. For example, icons for activities that initiate tasks are displayed in the launcher window. The icon is often accompanied by a label see the android:label attribute. If the android:immersive attribute is set to true in the app's manifest entry for this activity, the ActivityInfo.
The label is displayed on-screen when the activity must be represented to the user. It's often displayed along with the activity icon. They are: " standard " " singleTop " " singleTask " " singleInstance " The default mode is " standard ". Comments Normal launches for most activities " standard " Yes Default. The system always creates a new instance of the activity in the target task and routes the intent to it. Specialized launches not recommended for general use " singleTask " No The system creates the activity at the root of a new task and routes the intent to it.
However, if an instance of the activity already exists, the system routes the intent to existing instance through a call to its onNewIntent method, rather than creating a new one. The activity is always the single and only member of its task. This is the default value. Tasks don't launch into lock task mode but can be placed there by calling startLockTask.
If the DPC does not authorize this package then this mode is identical to normal. This attribute was introduced in API Level When this number of entries is reached, the system removes the least-recently used instance from the overview screen.
Valid values are 1 through 50 25 on low memory devices ; zero is invalid. This must be an integer value, such as The default value is If the app runs on a device with a wider aspect ratio, the system automatically letterboxes the app, leaving portions of the screen unused so the app can run at its specified maximum aspect ratio.
Maximum aspect ratio is expressed as the decimal form of the quotient of the device's longer dimension divided by its shorter dimension. For example, if the maximum aspect ratio is , set the value of this attribute to 2. On non-wearable devices, the value of this attribute needs to be 1.
On wearable devices, it must be 1. Otherwise, the system ignores the set value. The attribute value should be a fully qualified class name such as, " com. ExtracurricularActivity ". However, as a shorthand, if the first character of the name is a period for example, ". There is no default. The name must be specified. This attribute was introduced in API Level 3. If you use this attribute, you must set its value to one of the following: Value Description persistRootOnly Default value.
When the system restarts, the activity task is preserved, but only the root activity's launching intent is used. This attribute was introduced in API level If a caller of startActivity or startActivityForResult has not been granted the specified permission, its intent will not be delivered to the activity. Normally, all components of an application run in a default process name created for the application and you do not need to use this attribute.
Mutation observers are intended to let you be able to watch the desired set of nodes over time, even if the direct connections between those nodes are severed. If you begin watching a subtree of nodes, and a portion of that subtree is detached and moved elsewhere in the DOM, you continue to watch the detached segment of nodes, receiving the same callbacks as before the nodes were detached from the original subtree.
In other words, until you've been notified that nodes are being split off from your monitored subtree, you'll get notifications of changes to that split-off subtree and its nodes. This prevents you from missing changes that occur after the connection is severed and before you have a chance to specifically begin monitoring the moved node or subtree for changes. Theoretically, this means that if you keep track of the MutationRecord objects describing the changes that occur, you should be able to "undo" the changes, rewinding the DOM back to its initial state.
In this example, we demonstrate how to call the method observe on an instance of MutationObserver , once it has been set up, passing it a target element and an options object. Declare the observer in the appropriate area.
Observers are a certain type of Magento class that can influence general behavior, performance, or change business logic. Observers are executed whenever the event they are configured to watch is dispatched by the event manager. One of the more powerful feature of observers is that they are able to use parameters passed into the event when it was dispatched. Below is an example of an observer obtaining data passed in when the event was dispatched.
Observers can be configured to watch certain events in the events. The observer xml element has the following properties:. The observer name must be unique, or an override will occur. You cannot enter the request system reboot command once you schedule a commit operation for a specific time in the future. You cannot commit a configuration when a scheduled commit is pending. For information about how to cancel a scheduled configuration by means of the clear command, see the CLI Explorer.
To monitor the device configuration commit process, use the display detail command after the pipe with the commit command:. You can include a comment that describes changes to the committed configuration. To do so, include the commit comment statement. The comment can be as long as bytes and you must type it on a single line. You cannot include a comment with the commit check command. To add a comment to the commit command, include the comment statement after the commit command:.
To add a comment to the commit confirmed command, include the comment statement after the commit confirmed command:. To view these commit comments, issue the show system commit operational mode command. Batch commit aggregates or merges multiple configuration edits from different CLI sessions or users and adds them to a batch commit queue.
A batch commit server running on the device takes one or more jobs from the batch commit queue, applies the configuration changes to the shared configuration database, and then commits the configuration changes in a single commit operation.
Batches are prioritized by the commit server based on priority of the batch specified by the user or the time when the batch job is added. When one batch commit is complete, the next set of configuration changes are aggregated and loaded into the batch queue for the next session of the batch commit operation. Batches are created until there are no commit entries left in the queue directory. When compared to the regular commit operation where all commits are independently committed sequentially, batch commits save time and system resources by committing multiple small configuration edits in a single commit operation.
Batch commits are performed from the [edit batch] configuration mode. The commit server properties can be configured at the [edit system commit server] hierarchy level. When there is a load-time error in one of the aggregated jobs, the commit job that encounters the error is discarded and the remaining jobs are aggregated and committed.
For example, if there are five commit jobs commit-1 , commit-2 , commit-3 , commit-4 , and commit-5 being aggregated, and commit-3 encounters an error while loading, commit-3 is discarded and commit-1 , commit-2 , commit-4 , and commit-5 are aggregated and committed.
If there is an error during the commit operation when two or more jobs are aggregated and committed, the aggregation is discarded and each of those jobs is committed individually like a regular commit operation. For example, if there are five commit jobs commit-1 , commit-2 , commit-3 , commit-4 , and commit-5 that are aggregated and if there is a commit error caused because of commit-3 , the aggregation is discarded, commit-1 , commit-2 , commit-3 , commit-4 , and commit-5 are committed individually, and the CLI reports a commit error for commit This example shows how to configure batch commit server properties to manage batch commit operations.
You can control how the batch commit queue is handled by the commit server by configuring the server properties at the [edit system commit server] hierarchy level. This enables you to control how many commit jobs are aggregated or merged into a single batch commit, the maximum number of jobs that can be added to the queue, days to keep batch commit error logs, interval between two batch commits, and tracing operations for batch commit operations.
To quickly configure this section of the example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, and then copy and paste the commands into the CLI at the [edit] hierarchy level. You can configure the commit server properties from either the regular [edit] mode or the [edit batch] mode. Optional Configure the number of commit transactions to aggregate or merge in a single commit operation.
The default value for maximum-aggregate-pool is 5. Setting maximum-aggregate-pool to 1 commits each of the jobs individually. In this example, the number of commit transactions is set to 4 indicating that four different commit jobs are aggregated into a single commit before the commit operation is initiated. If you set maximum-entries to 1 , the commit server cannot add more than one job to the queue, and the CLI displays an appropriate message when you try to commit more than one job.
Optional Configure the time in seconds to wait before starting the next batch commit operation. From configuration mode, confirm your configuration by entering the show system commit server command. If the output does not display the intended configuration, repeat the instructions in this example to correct the configuration.
To commit the configuration from the [edit batch] mode, do one of the following:. To assign a higher priority to a batch commit job, issue the commit command with the priority option. To commit a configuration without aggregating the configuration changes with other commit jobs in the queue, issue the commit command with the atomic option. To commit a configuration without aggregating the configuration changes with other commit jobs in the queue, and issuing a higher priority to the commit job, issue the commit command with the atomic priority option.
By default, the status of the commit server is Not running. The commit server starts running only when a batch commit job is added to the queue. When a batch commit job is added to the queue, the status of the commit server changes to Running. The Jobs in process field lists the commit IDs of jobs that are in process. Pending commits displays commit jobs that are added to the commit queue but are not committed yet.
Completed commits displays the list of commit jobs that are successful. Error commits are commits that failed because of an error. View the timestamps, patch files, and the status of each of the commit jobs. Patch files show the configuration changes that occur in each commit operation that is added to the batch commit queue. Use the show system commit server queue patch command to view the patches for all commit operations.
The output shows the patch created for a commit job. View the trace files for batch commit operations. You can use the trace files for troubleshooting purposes.
If you do not issue the request system snapshot command, the configuration on the alternate boot drive is out of sync with the configuration on the primary boot drive. After you issue the request system snapshot command, you cannot return to the previous version of the software because the running and backup copies of the software are identical. Help us improve your experience.
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