What development tools do programmers do not need to install when developing HarmonyOS mobile apps?
When testing the Bluetooth Low Energy feature of HarmonyOS, a developer needs to make the central device perform Bluetooth scanning. Which of the following descriptions of the developer's actions are correct?
In the process of application development, a developer uses the global concurrent task distributor to dispatch tasks, and if a specific task needs to be executed 10 times, the developer can use applyDispatch to execute the task multiple times.
After the card is added to the card management service, the card user caches the view information of the card, so that the cached data can be directly returned the next time the card is obtained, reducing the delay.
On the basis of the supported input events, the multi-mode input defines some input actions commonly used by users as a set of standardized events, and maps the input events of different input devices to the standardized events.
An engineer wrote the following code, which items are correct in the description of the following code?
@Entity(tableName="user",ignoredColumns={"ignoredColumn1","ignoredColumn2"},indices ={@Index(value ={"firstName","lastName"),name="name_index",unique =true)})
How do I define the permissionscorrectly when a developer needs to customize the permissions for the Harmony OS third-party application?
In the JS (JavaScript) UI framework, which layer is connected to the system platform platform by abstracting the platform layer and providing an abstract interface?
A developer obtains a log content: static final HiLogLabel LABEL = new HiLogLabe1 (HiLog.LOG_APP,0x00201,"MY_TAG");
Which of the following information can't be obtained?
If a UI is no longer visible to the user, but you don't want to destroy it, which method will the system call to release the corresponding resources?
The engineer fails to access the network through the get request, and the prompt 'Attempt to invoke virtual method' is displayed, which of the following permissions should be configured in config.json?
Before developing the NFC function, a HarmonyOS developer must first confirm whether the device supports the NFC function and whether the NFC is turned on.
WhenthePage of Harmony OS executes the onForeground() callback, which of the following states will the Page return to first?
If a developer wants to develop a Data Ability for the storage and management of application data, which of the following can help the developer realize the function ofinserting multiple pieces of data into the database at one time?
When a developer uses HarmonyOS Device Manager, he wrote the following code, which code description is correct?
Vardevicelnto=dmInstance.getLocaIDevicelnfoSync () :
