Good H14-231_V1.0-ENU Exam Dumps Save Your Preparation Time

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April 9, 2024

Huawei H14-231_V1.0-ENU dumps questions are an essential tool for anyone looking to pursue the HCIP-HarmonyOS certification. By using these H14-231_V1.0-ENU dumps questions as part of your exam preparation, you can gain a deeper understanding of the exam format, identify knowledge gaps, build confidence, get real-time feedback, and stay up-to-date with the latest trends in HCIP-HarmonyOS Application Developer V1.0. So, if you're serious about achieving H14-231_V1.0-ENU certification success, be sure to incorporate H14-231_V1.0-ENU exam dumps questions into your study plan. Test free Huawei H14-231_V1.0-ENU exam dumps below.

Page 1 of 21

1. If a developer wants to develop a page with a tab function, the developer can use the TabList component provided by HarmomyOS.

If you want to set the horizontal center alignment of text, which of the following codes is correct?

ohos:text_alignment=start

ohos:text_alignment=bottom

ohos:text_alignment=vertical_center

ohos:text_alignment=horizontal_center

2. In DevEco Studio, engineers can log in to the emulator after passing the real-name authentication of their HUAWEI ID.

True

False

3. When a developer uses the Text component for development, because the length of the input string is too long, which of the following codes can be used to display the entire content?

ohos:truncation_mode="none"

ohos:truncation_mode="ellipsis_at_start"

ohos:auto_font_size="true"

ohos:multiple_lines="true"

4. When a developer uses the distributed task scheduling capability of HarmonyOS, which of the following features can be selected by the developer?

Remote start

Remote call

Remote connection

Migration

5. When I use the interface to set the system time in HarmonyoS, which of the following is the smallest time unit?

minute

seconds

microseconds

6. When a developer develops a HarmonyOS application and uses an intent pass object, which of the following descriptions of intent are correct?

does not specify the BundleName and Ability Name to implement the jump, and the application is started according to other attributes in the operation

Specify the BundleName and AbilityName to implement the jump, and start the application directly according to the full name of the Ability

deals with the work of an application as a whole

is a long-lifecycle, D-program with no user interface that keeps the app running in the background and doesn't disappear by switching pages

7. There are two Text components in the Row component, if the justifyContent alignment method is used, which of the following properties can be aligned to the left and right ends

FlexAlign.Start

FlexAlign.SpaceEvenly

FlexAlign.End

FlexAlign.SpaceBetween

8. HarmonyOS supports on-demand elastic deployment of a variety of terminal devices.

supports the configuration of the feature set within the component

does not support the association of dependencies between components

Support the on-demand selection of each component

Clipping of functions within the component is not supported

9. When the Page of Harmony OS executes the onForeground() callback, which of the following states will the Page return to first?

INITIAL

INACTIVE

ACTIVE

BACKGROUND

10. A developer calls the getDefauitHOST(Context context) interface of Bluetooth HOST to obtain a Bluetooth HOST instance for managing local Bluetooth operations. This developer experiments with the following development steps to implement Bluetooth pairing. 1Turn on Bluetooth, 2Scan Bluetooth 3 Initiate pairing

Which of the following statements about steps 1, 2, and 3 are correct?

CALLS STARTPAIR() TO COMPLETE STEP 3

calls enablebt() to complete step 1

CALLS STARTBTDISCOVERY() TO COMPLETE STEP 2

steps 2 and 3 can be reversed in the order D

Page 2 of 21

11. A developer uses a task distributor to dispatch tasks 1, 2, and 3. The developer added Task 1 and Task 2 to a task group and used syncDispatchBarrier to set up a task execution barrier on that task group. During execution, the discoverer waits for both task 1 and task 2 to be executed before executing task 3.

Based on the above scenario analysis, which of the following task distributors may be used by the developer?

SpecTaskDispatcher

ParallelTaskDispatcher

GlobalTaskDispatcher

Serial TaskDispatcher

12. If a developer wants to develop an application on a smart screen, which of the following subsystems will he use?

DV subsystem

Proprietary business subsystem of smart screen

Media Subsystem

Safety subsystem

13. If a developer wants to develop a file background download function, there needs to be a Page Ability to provide UI pages, and a Service Ability to provide the background file download function.

Which of the following can invoke Service Ability in Page Ability?

connectPageAbility(intent,connection)

connectAbility(intent, connection)

onConnect

connectServiceAbility(intent, connection)

14. A user uses the HarmonyOS distributed task scheduling capability to migrate mobile phone videos to the smart screen for playback. In this scenario, the process of finding whether the smart screen has the same playback software is a global query.

True

False

15. A PageA contains Ability SliceA1 and AbilitySliceA2, which is displayed as AbilitySliceA1 by default.

What are the following steps if you want to navigate directly to PageA's AbilitySliceA2 in PageB on the current device?

Add a route for AbilitySliceA2 via addActionRoute() in PageA

Set the action in the Intent of the PageB navigation

Set Deviceld to empty in the Intent of the PageB navigation

16. HarmonyOS adopts a multi-core design, which supports the selection of appropriate OS kernels for different resource-constrained devices, and the kernel abstraction layer provides basic kernel capabilities for the upper layer by shielding the differences between multiple cores, including which of the following?

Memory management

File Management

Network management

Peripheral management

Process Management

Thread Management

17. HarmonyOS Converged Search provides developers with search-engine-level full-text search capabilities to provide users with a more accurate and efficient search experience.

Cross-app search

System global search

Open systems search

In-app search

18. If a developer wants to use the notification function of HarmonyOS when developing an application, which of the following notification styles can be selected by the developer?

Plain text

Multi-line text

Long text

Picture

19. If a developer wants to use the clipboard service of HarmonyOS to implement simple data transfer between applications, which of the following statements is correct?

can paste the data copied in app A and paste it in app B

You can add or remove callbacks for changes in system clipboard data

can read, write, and query clipboard data from the system clipboard

Clipboard data written to the clipboard service is destroyed at the end of the application

Apps that don't get focus in the foreground also have access to the system clipboard

20. Which of the following languages does HarmonyOS support for creating application projects?

C++

Python

JS(JavaScript)

Java

Page 3 of 21

21. When designing an application, the program needs to include the global configuration information of the application and the configuration information of the HarmonyOS Ability Package (HAP).

In which file can the developer configure this information?

build.gradle

Manifest.xml

MainAbility.java

config.json

22. When a developer navigates within the same page, the AbilitySlice is new, even if present(newTargetSlice(), new Intent()) is repeatedly called, it will not cause any AbilitySlice to be out of the stack.

True

False

23. In a HarmonyOS application, which of the following and the ComponentContainer object are actually composed of the interface elements that the user sees?

DirectionLayout

DependentLayout

Component

TableLayout

24. If there are different components in the layout with the same ID, when the component is searched by ID, the last component found will be returned.

True

False

25. A developer found that the app could not use the network management function of Harmony OS without requesting permissions.

In order to use the network management feature, the developer requested the following permissions for their app, which of them is not required for the network management feature?

ohos.permission.SET_NETWORK_INFO

ohos.permission.INTERNET

ohos.permission.LOCATION

ohos.permission.GETNIPORK_INFO

26. A developer is writing a piece of code to control the access rights of an Ability Apps with the ohos.permission.CAMERA permission can access this ability.

The relevant code completed by the developer in config.json is as follows:

"abilities": [

{

"name": ". MainAbility",

"description":

"Sstring:description_main_abi1ity",

"icon" : "$media:hiworld.png",

"label": "HiCamera",

"1aunchType": "standard",

"orientation": "portrait",

"visible": false,______________________________

} ]

Which of the following should the developer add to the horizontal line?

"permissions": [ "ohos.permission.CAMERA" ]

"defPermissions":[ {"ohos.permission.CAMERA"}]

"reqPermissions": [ { "ohos.permission.CAMERA”}]

"permissions": [ "ohos.permission.LOCATION"]

27. Which of the following NFC functions can developers use when developing apps based on HarmonyOS?

NFC message notification

Access to the security element

card emulation

NFC basic query

28. When developing a HarmonyOS application, if you want to set the background color for a Text component in the page, the following is correct

ohos:background_element="$graphic:background

ohos:background_element="$color:green"

ohos:background_element="#0000FF"

ohos:background_element="#880000FF"

29. When using Bluetooth Low Energy in HarmonyOS, the peripheral device, as a client, can receive GATT connection requests from the central device, but cannot

True

False

30. Which of the following components cannot contain subcomponents?

Row

Button

Text

LoadingProgress

Page 4 of 21

31. What principles of permission should be followed when developing HarmonyOS applications?

The user can know and control

The permission application is complete

Custom permissions to prevent duplicate names

Permission requests are minimized

32. There are two Text components in the Row component, if you use justifyContent alignment, which of the following properties can achieve left and right alignment?

FlexAlign.Start

FlexAlign.SpaceEvenly

FlexAlign.End

FlexAlign.SpaceBetween

33. Lightweight data storage is suitable for data storage involving a large number of data relationships and business relationships, and has better read and write performance than relational databases and object-relational mapping databases.

True

False

34. If a developer wants to develop a file background download function, there needs to be a Page Ability to provide UI pages, and a Service Ability to provide the background file download function.

Which of the following can call Service Ability in Page Ability?

onConneCtenxt()

connectPageAbility(intent.connection)

connectAbility(intent.connection);

connectServiceAbility(intent,connection);

35. Both the provider and user of DataAbility use a URI (UnifomResourceldentifier) to identify a specific data, and the format of the URI is as follows:

Scheme://[authority]/[path][? query][#fragment]

Which is the correct URI description in the cross-device scenario and the local device scenario?

In cross-device scenarios, you do not need to enter authority

In cross-device scenarios, the scheme is fixed to "dataability".

In the local device scenario, authority does not need to be specified

In the local setting, the path does not need to be specified

36. Which of the following component hierarchies is wrong?

list>listltem>Column

Column>List>Listltem

Grid>Row>Gridltem

Grid>Gridltem

37. Which of the following functions can be achieved through the sidebar button of the remote simulator?

Sets the device resolution of the remote emulator

Release the remote emulator that is currently in use

Rotate the screen clockwise

Return to the main interface of the device

38. When a developer adds a Harmony OS app on the AppGallery web page, which platform does the developer need to choose to add the app?

quick application

Android

Web

HarmonyOS app

39. When using EventHandler to implement inter-thread communication, if EventRunner takes out the InnerEvent event, EventRunner will directly process the event on the new thread.

True

False

40. The data generated by a developer's use of Data Ability can be shared between different applications on the same device, but cannot be shared across devices.

True

False

Page 5 of 21

41. What files does an engineer need to use when he wants to debug a newly developed application on a real device?

HarmonyOS AppProvision

Private key

Request file

Digital certificates

42. HarmonyOS provides developers with data management functions, which of the following are the following?

Converged Search

Data storage management

Distributed data services

Distributed file services

Local database

43. When a developer develops an application based on HarmonyOS, the data used by a developer can be decomposed into multiple objects. The developer needs to add, delete, modify, and check the teaching data, but does not want to write overly complex SQL statements. In this scenario, the developer can use an object-relational mapping database to process the data.

True

False

44. 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.

True

False

45. When a developer develops a background music playback software, he needs to use Service Ability, what are the following correct descriptions of the use process of Service Ability?

When you use the connectAbility() method to connect to a Service, you need to pass in the Intent of the target Service

onConnect() needs to return an IRemoteObject object back

Use setElement() of the Intent to set the target service information

46. If a developer wants to use the JavaScript UI framework to develop a graffiti application that allows users to draw custom graphics, which of the following components can be used by the developer?

video

button

canvas

grid-container

47. In the HarmonyOS system architecture, which of the following can shield the differences between multiple cores and provide basic kernel capabilities for the upper layer?

Ability

KAL (Kernel Abstract Layer)

HDF (Hardware Driver Foundation)

48. When an application calls a service, the service will check the permissions of the application, and the service cannot be used if there is no corresponding permission.

True

False

49. A developer wants to use macOS for HarmonyOS application development, but the development tool DevEco Studio does not support macOS installation.

True

False

50. The meta-service package consists of one or more HAP packages, and each HAP package shall not exceed ( ) to provide a second-to-open experience.

2GB

10M

1GB

Unlimited

Page 6 of 21

51. How should a developer choose the Debug Type if he needs to debug JAVA code separately in a JS+JAVA hybrid project?

Native only

Dual (JS + JAVA)

JAVA only

Js only

52. Which of the following belongs to the lifecycle of starting a Service Ability?

onStart()→onComrand()→onBackground()→onStop()

onStart()→onCommand()―onForeground()→onBackground()→onStop()

onStart()→onCommand()→onStop()

onStart()→ onCommand()→onBackground()→ onDisconnect()→onStop()

53. A developer is using CommonEventData to encapsulate information about ordered public events for data processing when publishing, distributing, and receiving.

What do I need to pay attention to when developing?

data is the result data of an ordered public event

intent is not allowed to be empty

intent ― must be empty

code is the result code of an ordered public event

54. To test the HarmonyOS Bluetooth Low Energy function, a developer uses a central device to call the startScan() interface and scans for a peripheral device. In order for the central device to complete the data exchange with the peripherals, the developer implemented the following development steps.

GATT connection is successful, and the peripheral device can call the write method to write the eigenvalue data to the central device

After the central device obtains the peripherals, it calls connect (boolean isAUtoConnect, BlePeripheraCallback callback) to establish a GATT connection with the peripherals

After the C GATT connection is successful, the central device can call the discoverServices() interface to obtain various data supported by the peripheral equipment

After the GATT connection is started, the developer needs to determine whether the GATT connection is successful based on the serviceDiscoveredEvent(int status) callback result

55. If a developer wants to quote the resource files in the base directory and the qualifier directory, which of the following can be used to do so?

Specify the resource type and resource size

Resource name

Resource size

Specify the resource type and resource name

56. A HarmonyOS developer uses the EventHandler mechanism to process four events: A, B, C, and D, where event D retains the default priority, and the priority properties of the other three events are set as follows:

Event A: Priority.INTERMEDIATE

Event B: Priority.HIGH

Event C: Priority.IDLE

Which of the following statements about the above events are correct?

Event A will be delivered immediately

Event B D will be delivered before Event B

delivers event C when there are no other events

Event D will be delivered before Event C

57. 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?

Application Layer

Front-end frame layer

Engine Layer

Platform adaptation layer

58. When developing a HarmonyOS application, a developer receives the following product request: If a user logs in to the same HarmonyOS account on device A and device B, the user can log in to the app on device A and synchronize the application account authentication information to device B as needed. After the account authentication information is synchronized, the user can open the application on device B and log in directly without entering the application account authentication information again.

Which of the following descriptions of this scene is correct?

The developer can do this with the help of DVID, as the application can access and manage distributed devices based on the DVID

The developer can use the UUID to do this, because the app can uniquely identify the same device with the UUID during its lifetime

If the developer uses the UUID to achieve the above requirements, the UUID flag will still exist after the application is uninstalled

If the developer uses the DVID to achieve the above functions, the DVID is strongly associated with the HarmonyOS account and application information, so it can prevent other applications from accessing the current application data

59. The log content filtered by a developer through relevant information is: 01-20 16:08:36.908 23597/com.example.myapplication W00201/MY-TAG:Failed to visit,reason:503.Which of the following cannot be obtained by analyzing this log?

is defined in the HiLogLabel

Errno value

Reachable URL value

The log level is WARN

60. When a developer uses the JS (JavaScript) UI framework to develop an application, if style =width:"10px is used in the component, the width of the component cannot be dynamically modified. If you use style="width:{{width}}" to set the width of a component, you can dynamically modify the width of the component in a JS file.

True

False

Page 7 of 21

61. A developer wants to use JS (JavaScript) to develop an application on the smart screen, Which of the following development languages does the developer need to master?

C/C++

CSS

HTML5

JavaScript

62. A developer is developing an online education application, and there are multiple choice questions and multiple choice questions in the student choice questions?

Picker

Checkbox

RadioButton

Switch

63. When a developer designs a navigation application and needs the system to provide accurate positioning, which subsystem will be used?

Wearable business subsystem

Location Services Subsystem

Multi-mode input subsystem

Media subsystem

64. A developer creates MyAbility with FooAbilitySlice and BarAbilitySlice, and currently FooAbilitySlice is in the foreground and gets focused, and then navigates to BarAbilitySlice, what happens to the lifecycle state in this period?

FooAbilitySlice changes from the INACTIVE state to the ACTIVE state

BarAbilitySlice changes from the INITIAL state to the INACTIVE state first

FooAbilitySlice changes from ACTIVE to INACTIVE

FooAbilitySlice changes from INACTIVE to BACKGROUIND

65. A HarmonyOS developer develops an application based on distributed data services, and the developer uses device A, device B, and device C to test the functionality of the application in a distributed scenario. In the test, after device A successfully adds, deletes, and modifies data, device B and device C cannot read the updated data immediately, but after a certain time window, the data of the three devices will reach the same state.

In the preceding scenario, what kind of consistency does the application conform to in a distributed database?

Weak consistency

Strong consistency

Eventual consistency

Process consistency

66. When using the location capability of HarmonyOS, developers need to apply for the LOCATION permission, which is a non-sensitive permission and needs to be declared in config.json.

True

False

67. If the user displays the navigation information on the mobile phone and the smart watch at the same time, if the smart watch is out of power, causing the navigation information to terminate the display, which callback method will the navigation application on the mobile phone receive the termination notification?

onCompleteContinuation

onRestoreData

onRemoteTerminated

onSaveData

68. If the third-party library used by the developer involves permission management, the permission needs to be declared one by one in the config.json file of the application.

True

False

69. Which of the following features does HarmonyOS smart home devices include?

Minimalist connection

Wildcard card

Minimalist interaction

Hardware Mutual Aid

70. Atomic service is a future-oriented service delivery method provided by HarmonyOS, which of the following statements about atomic service is correct?

Atomic service consists of one or more HAP packets, and one HAP packet corresponds to one FA or one PA

Atomic services are managed and distributed by AppGallery

All HAP packages (including EntryHAP and FeatureHAP) of the Atomic Service are non-installation-free

Atomic services do not have desktop icons, but they can be manually added to desktops in the form of service cards

Compared with the traditional way of installing applications, the E atomic service is lighter, and provides richer entry points and more accurate distribution

Page 8 of 21

71. A Page Ability (hereinafter referred to as "Page") may consist of one or more AbilitySlice, which refers to the sum of a single page of an application and its control logic.

True

False

72. fter a developer sets :ohos:layout_alignment="horizontal_center" in the Text component, he writes: text.setMarginRight (600) in the code, where is the Text displayed in the parent layout?

is horizontally centered and shifted to the right by 600

The parent layout moves 600 to the top left and right

level is centered

is horizontally centered and shifted 600 to the left

73. When a developer wants to make the vertical scrolling layout take effect when using the ScrollView control, how should the width of the control corresponding to the layout be set?

match_child

Fixed width value

match_parent

match_content

74. Which of the following subsystems does a developer use when using the facial recognition feature of HarmonyOS?

Multi-mode input subsystem

Media Subsystem

Safety subsystem

Graphics subsystem

75. HarmonyOS is designed for 1+8+N full-scene experience, which of the following devices belongs to the "8" in 1+8+N?

headphones

Microwave oven

Audio

Glasses

76. If a developer wants to achieve the effect of page swiping in an application, which of the following components does the developer need to select?

PageSlider

ToastDialog

webView

ProgressBar

77. A manufacturer uses the HarmonyOS system to produce a smart oven, which is a lightweight system device in HarmonyOS.

True

False

78. Which of the following properties about Web components is incorrect?

Set whether to enable the access of the Chinese system of the application, which is enabled by default. Access to files in the rawfile path in $rawfile(filepath/filename) is not affected by this attribute.

imageAccess specifies whether to allow automatic loading of image resources, which is allowed by default.

javaScriptAccess is set to whether to allow JavaScript script execution, which is not allowed by default.

zoomAccess sets whether to support gesture zoom, which is allowed by default.

79. In order to complete the release of the application, an engineer needs to apply for a digital certificate, which of the following options is correct about the description of the digital certificate?

is in the format of .csr

contains the public key in the key pair

Digital certificates are used to ensure the integrity of the application

is issued by AppGallery Connect

80. If an engineer needs to determine whether a device supports the corresponding decoder of the specified MIME (Multipurpose Internet Mail Extensions), which of the following interfaces should be selected?

getSupportedMimes()

isEncodeSupportedByMime(String mime)

isDecodeSupportedByMime(String mime)

isDecoderSupportedByFormat(Format format)

Page 9 of 21

81. An engineer wrote the following code, which items are correct about the description of the following code?

@Entity(tableName = "user", ignoredColumns = {"ignoredColumn1", "ignoredColumn2"} , indices = {@Index(value = {"firstName", "lastName"), name ="name_index", unique = true)})

name_index is the compound index name

index values are not unique

ignoredColumns indicates that the field does not need to be added to the properties of the user table

The table name is user

82. HarmonyOS adopts a multi-core design, which supports the selection of appropriate OS kernels for different resource-constrained devices, and which of the following capabilities does the kernel provide for the operating system?

file system

Memory management

Peripheral management

Thread management

83. Which of the following belongs to the application layer in the HarmonyOS system architecture?

UI framework

AI subsystem

Phone

kernel

84. If a developer wants to be able to get the return result when the user returns from the navigation target AbilitySlice, they should use presentForResult() to implement the navigation. When the user returns from the navigation target AbilitySlice, the system will call onResult() to receive and process the returned result.

True

False

85. Browse articles in the reading app on your phone, migrate to the tablet to continue viewing, and exit

the reading app on your phone.

Which HarmonyOS streaming solution is used in this scenario?

Multi-terminal migration

Multi-terminal collaboration

Cross-terminal collaboration

Cross-terminal migration

86. The following code snippet is used to start the Service of the remote device, if it is replaced with the Service.withDeviceld("deviceld") that starts the local device, it can be deleted.

Intent intent =new Intent();

Operation operation =new Intent.OperationBuilderO

.withDeviceld("deviceld")

.withBundleName

("com.domainname.hiworld.himusic")

.withAbilityName("com.domainname.hiworld.himusic.ServiceAbility")

.withFlags(Intent.FLAG_ABILITYSLICE_MULTI_DEVICE)

.bui1d();

intent.setOperation(operation);

startAbility(intent);

True

False

87. Suppose that multiple AbilitySlice are associated in MainAbility, and multiple AbilitySlice are switched in the same page, the lifecycle of MainAbility and all AbilitySlice is synchronized.

True

False

88. HarmonyOS provides the NFC message notification function, through which developers can obtain the message of the NFC switch state change and the NFC field strength message.

True

False

89. When a developer is developing an online education application, he has designed a feedback function that provides a text input box for users to fill in suggestions, which of the following components can help the developer realize this function?

TextField

Picker

Checkbox

TabList

90. A HarmonyOS developer created two serial task distributors, dispatchera and dispatcher_b, and also created a proprietary task dispatcher.

Which of the following scenarios can cause deadlocks due to improper use of syncDispatch?

On a dedicated thread, dispatchers are used for syncDispatch

uses dispatcherb to dispatch tasks synchronously in dispatchera tasks

In the tasks dispatched by dispatcher_a, the dispatcher_a is used again to dispatch the task

The thread pool is full

Page 10 of 21

91. In HramonyOS, which of the following can developers use the static animation feature to achieve?

The picture is rotated along the center point

The image rotates along the horizontal axis

The picture rotates along the edges

The picture rotates along the vertical axis

92. The user and provider of the service card do not require permanent operation, and when it is necessary to add, remove, or request to update the card, the card management service will pull up the card provider to obtain the card information.

True

False

93. In the process of developing an application based on HarmonyOS, in order to avoid applying for permissions that are unrelated to the user's required functions, a developer uses the UUID generated by the application instead of the device ID to reduce the permission application. The developer's actions exemplify the principle of applying for permissions in the vicinity.

True

False

94. Which of the following permissions is required to load network images with the Image component?

ohos.permission.READ_MEDIA

ohos.permission.INTERNET

ohos.permission.GET_NETWORK_INFO

ohos.permission.DISTRIBUTED_DATASYNC

95. Where can I get the HarmonyOS app after the release?

HUAWEI AppGallery

Huawei Service Center

Huawei Ecosystem Marketplace

Huawei Talent Center

96. In the JavaScript UI framework, which layer is used to provide animation parsing, DOM (Document Object Model) tree construction, layout calculation, rendering command construction and drawing, event management, etc.?

Engine Layer

Platform adaptation layer

Front-end frame layer

Application layer

97. A developer calls the terminate method in JavaScript code, which causes the Page Ability to be destroyed.

True

False

98. If a developer uses the startAbility() method provided in Ability to start a Service, what are the correct descriptions of starting the Service?

If the Service is running, the system will call back the onStart() method of the Service to start the Service

If the Service is running, the system will call back the onCommand() method of the Service to start the Service

If the Service is not already running, the system will call the onCommand() method to start the Service

If the Service is not yet running, the system will call onStart() to initialize the Service

99. When I need to create a profile when publishing an application, what type should I choose?

Debug

distribution

runs

Operations

100. The maximum length limit of the preference key is ( ) bytes

Page 11 of 21

101. When a data engineer constructs a data table, which of the following can be used as data types?

Boolean type

String type

Double-precision floating-point type

integer type

102. The network management module of HarmonyOS can realize the communication between different processes of the machine, and the communication supports streaming socket technology.

True

False

103. When a developer develops a JavaScript application on a smart screen.

If you want to do some static animation, if you want to move a component 200px horizontally, which of the following styling configurations is correct?

transform: rotate×(200px);

transform: rotateY(200px);

transform: translatex(200px);

transform: scaleX(200px);

104. When creating an application, which field in the app.json5 or config.json file must be the same as the application package name?

package

name

bundleName

page

105. What are the data management methods provided by HarmonyOS?

preference

Distributed data services

Relational databases

Distributed data objects

106. 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?

harmonyos. permission. INTERNET

harmonyos. permission. ANSWER:

harmonyos. permission. REQUEST

harmonyos. permission. ACCESS_NETTORKSTATE

107. Which of the following is part of the basic software service subset in HarmonyOS?

multimedia subsystem

Telephone subsystem

Event Notification Service Subsystem

Graphics subsystem

Location Services subsystem

108. A developer has multiple versions of the object-relational mapping database, and the developer calls the BOOKstoreUpgrade class to upgrade the database version, and the version number of the BOOKstoreUpgrade class is configured as "3", and the actual version number of the current BOOKstore.db is "1", in this case, TestormMigration12, TestormMigration23 The onMigration method is automatically called to complete the database upgrade.

True

False

109. Do I need manual review after the release of the open beta version?

Yes

does not need to

Required before testing

Required before release

110. In the distributed terminal scenario, only by ensuring that the equipment used by the user is safe and reliable can the user's data be effectively protected on the virtual terminal and avoid the leakage of user privacy.

What does HarmonyOS do to ensure that your devices are reliable?

Trusted Execution Environment

Safe Boot

Device certificate authentication

Collaborative Mutual Aid Certification

Page 12 of 21

111. What are the types of background agent reminder services?

Countdown class

Calendar class

Alarm clock class

Schedule

112. In the HarmonyOS system architecture, the distributed data management module belongs to the framework layer.

True

False

113. HarmonyOS single-version distributed databases do not enable automatic synchronization between

networked devices by default, but you can enable automatic synchronization if necessary.

True

False

114. Which of the following sorting types does the trusted list of devices found by HarmonyOS Device Manager contain?

Historically first used

Intelligent Recommendation Mode

History recently used

History is the most used

115. A developer needs to read the resource file in the rawfile folder, and the following code can be used to read it successfully.

Image

image(Image)findComponentByld(ResourceTable.Id_component_image);

Image.setPixelMap (ResourceTable.Media hawei);

True

False

116. A software development engineer uses the traditional Bluetooth native management method to manage Bluetooth, which of the following functions can the engineer achieve?

Set the Bluetooth name

Get a list of Bluetooth devices that have been paired with Bluetooth for the machine

Send files via Bluetooth

Scan the surrounding Bluetooth settings

117. If a developer wants to develop a page with a tab function, the developer can use the TabList component provided by HarmonyOS. If you want to set the color of unchecked text to black.

Which of the following codes is correct?

ohos:selected_tab_indicator_color=#000000

ohos:tab_indicator_type=#000000

ohos:normal_text_color=#000000

ohos:selected _text_color=#000000

118. If a developer wants to obtain the location information of a HarmonyOS device, which of the following methods is correct?

must apply for ohos.permission.LOCATION_INBACKGROUND permissions and be authorized by the user.

If the application scenario does not require real-time device location, you can obtain the latest historical location result cached by the system

When the real-time location result of the device is successfully determined by the system, it will be reported to the application through the onLocationReport interface. Applications can implement their own business logic in the implementation of the onLocationReport API

You can use the system's predefined constant SCENE_TRAJECTORY_TRACKING in a trajectory tracking scene

119. After installing Lottie through OHPM, in which file will the relevant configuration information be generated?

module.json5

oh-package.json5

app.json5

main_page.json

120. The distributed database is based on the KV data model and provides KV access interfaces.

True

False

Page 13 of 21

121. Which of the following modules needs to be imported to initiate a network data request?

import http from '@ohos.net.http'

import http from ' @ohos.net.https'

import request from '@ohos.request'

import request from '@ohos.net.request'

122. In the same - Page, which of the following methods can be used to deal with the navigation between different pages?

startAbilityForResult ()

presentForResult ()

present()

startAbility()

123. 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.

True

False

124. If a developer wants to develop a local background music playback function, he needs to implement Page Ability to start Service Ability, which of the following parameters need to be specified when starting?

Flags

BundleName

AbilityName

DeviceID

125. Which of the following modules does the HarmonyOS forwarding architecture consist of?

Distributed Task Scheduling

Forwarding task management services

Distributed security authentication

Distributed soft bus

126. A developer has developed a news browsing application, and the news list page is displayed by default when the application is opened, which of the following methods does the developer use to achieve this function?

Intent()

SetMainRoute()

AddActionRoute()

onStart()

127. Which of the following subsystem sets are included in the basic capability subsystem of the HarmonyOS system architecture?

Distributed task scheduling

Distributed data management

Media Subsystem

User Program Framework

128. There is a configljson configuration file in the root directory of each HAP (HarmonyOS Ability Package) of a HarmonyOS application.

app

deviceConfig

module

abilities

129. When a time-consuming operation needs to be performed in a HarmonyOS application, it is preferable to create subthreads in FA instead of creating subthreads in Service.

True

False

130. HarmonyOS provides developers with different abilities according to different application scenarios, for example, if a developer plans to develop a background music playback function, which of the following is correct about the configuration of the ability in config.json?

“type: “service

“type: “page

“type: “ability

“type: “data

Page 14 of 21

131. Which of the following statements is correct?

preference follows the ACID characteristic

Preference is to access data in the form of Key-Value

The number of data stored in the preference is recommended not to exceed 10,000

The key of the preference is of type String

132. Which option is not the process of decoding in the conversion of the following information?

player plays music from the record

Convert the data to audio

Notebook plays video files from the hard drive

Save the photo in digital form

133. A HarmonyOS developer uses the EventHandler mechanism to handle four events: A, B, C, and D, where event D retains the default priority, and the priority properties of the other three events are set as follows:

Event A: Priority.IMMEDIATE

Event B: Priority.HIGH

Event C: Priority.IDLE

Which of the following accounts of the above events is correct?

Event A will be delivered immediately

Event B D will be delivered before Event B

delivers event C when there are no other events

Event D will be delivered before Event C

134. If a developer needs to use asyncDispatchBarrier to set up a barrier asynchronously, in this scenario, in order to separate different task groups, the developer can choose which of the following task dispensers?

GlobalTaskDispatcher

SpecTaskDispatcher

SerialTaskDispatcher

ParallelTaskDispatcher

135. The library file is the third-party code that the application depends, which are the correct ways to use the following library files?

Create a new module with the source code of the library file as a whole, and the entry directly references the classes in the library file

Put the library files in the libs directory in the form of jar, so, etc., and then reference the dependencies {Implementation project(:mylibrary)} through the build.gradle under the project If the required library files exist in the maven repository, you can configure the project's build.gradle as follows to use Repositories {.}

Maven{ Url 'XXX' // Add a Maven repository address, which can be a local Maven address or a remote Maven address }

Put the library file in the libs directory in the form of jar.so, and then refer to the dependencies (Implementationproject(: mylibrary)) through the build.gradle of the application module.

136. What development steps does a developer use to develop an application with a UI?

Create a project

Run the program

Design interface

Implement the function

137. Which of the following situations will not call back the onFinish function?

delay is set to 0

tempo is set to 1

iterations set to -1

playMode is set to PlayMode.Reverse

138. What are the boot modes of UIAbility?

multiton

singleton

specified

standard

139. In the process of coding, software development engineers need to detect whether the Butfer data is read and whether an exception occurs, which of the following methods can be called?

Errorbuatfer()

Bucferlistencr()

lCodecListener()

ErrorCode()

140. An engineer uses the WLAN P2P function, and the engineer can establish a P2P group.

True

False

Page 15 of 21

141. The callback mechanism provided by the Ability class can allow the Page instance to switch with the

user's operation background

True

False

142. Which of the following types of NFC tags are supported by HarmonyOS?

NFC-A

NFC-B

NFC-C

NFC-F

143. With regard to the characteristics of @State state data, the following description is incorrect

State is decorated with a variable that is the internal state data of the component, and when the state data is modified, the build method of the component will be called to refresh the U

Properties marked as @State are private variables that can only be accessed within the component

@State variable can be left without an initial value The decorated variables @Link

child components can be bidirectionally bound to the @State variables of the parent component

144. Which of the following subsystems in Harmony OS can achieve data isolation between applications?

Location Services subsystem

Safety subsystem

Media Subsystem

AI subsystem

145. When a developer is developing a UI, he writes the following code, which of the following is the correct implementation effect?

The two words "classmate" are evenly distributed horizontally on two lines

Text wraps automatically and keeps the upper and lower widths

The four characters "Hello classmates" are evenly distributed vertically on a column

The 4 words "Hello classmates" are evenly distributed horizontally on one line

146. If a developer needs to add the Banner function to a page, which of the following components is most suitable for implementing the function?

ScrollView

PageSlider

Text

ListContainer

147. When developing a HarmonyOS application, a developer receives the following product request: If a user logs in to the same HarmonyOS account on device A and device B, the user can log in to the app on device A and synchronize the application account authentication information to account B as needed. After the account authentication information is synchronized, the user can open the application on device B and log in directly without entering the application account authentication information again.

Which of the following descriptions of this scene is correct?

The developer can do this with the help of UUIDs, as the app can be used during its lifetime The UUID uniquely identifies the same device

If the developer borrows the UUID to achieve the above requirements, the UUID logo still exists after the application is uninstalled.

Developers can achieve the above requirements with the help of DVID, because the application can be accessed and managed according to the DVID Distributed equipment

148. How do I define the permissions correctly when a developer needs to customize the permissions for a third-party application for Harmony OS?

module: { reqPermissions: [{ name:com.myability.permission.MYPERMISSION,grantMode:system_grant, availableScope: [signatures] } }

module: { defPermissions: [{ name:name:com.myability.permission.lNTERNET, grantMode:user grant, availableScope: [signatures] } } module: { defPermissions: [{

name:name:com.myability.permission.INTERNET, grantMode:system_grant, availableScope: [signatures] } } module: { defPermissions: [{

name:name:com.myability.permission.MYPERMISSION, grantMode:system_grant, availableScope: [signatures] } }

149. Regarding the boot mode of UIAbility, the following statement is incorrect

UIAbility supports three launch modes: single-instance, standard-mode, and specified instance, which can be configured in module.json via launchType.

singleton is a single-instance mode, only one instance exists in the system, and if it already exists, the only instance in the system is reused.

standard is the standard mode, and a new instance will be started every time startAbility, and the system defaults to the standard mode.

specified is the specified instance mode, and the internal business of Ability decides whether to create multiple instances during runtime.

150. What is the format of the software package when uploading and publishing a software package?

.zip

.app

.apk

.hap

Page 16 of 21

151. The application package names of the application projects created by JavaSaript and the applications compiled by the Java projects are HAR (HarmonyOS Ability Resources) and HAP (HarmonyOS Ability Package), respectively.

True

False

152. Distributed task scheduling builds a unified distributed service management (discovery, synchronization, registration, and call) mechanism based on technical characteristics such as distributed soft bus, distributed data management, and distributed profile.

Remote start

Remote connection

Remote migration

Remote call

153. If a developer wants to implement the page swiping function in an application, which of the following components can be used to implement the function?

Picker

ListContainer

Switch

ScrollView

154. Which of the following are the animation control APIs provided by lottie?

lottie.play()

lottie.pause()

lottie.stop()

lottie.goToAndPlay()

155. When the state data of @State modification is modified, the () method of the component will be triggered to update the UI interface

build method

onPageShow method

aboutToAppear method

onStart method

156. An application needs to obtain the Wi-Fi connection status of the current device and check whether the Wi-Fi is turned on.

Which of the following permissions is not required in order to do this?

ohos.permission.LOCATION

ohos.permission.MEDIA_LOCATION

ohos.permission.GET_WIFI_INFO

ohos.permission.ACTIVITY MOTION

157. Which of the following methods can remove a notification?

cancel

cancelAll C, removeSlot

removeAll

158. HarmonyOS supports the flexible deployment of multiple terminal devices on demand through design methods such as componentization and miniaturization, and can adapt to different types of hardware resources and functional requirements.

Which of the following descriptions of elastic deployment are correct?

Clipping of functions within the component is not supported

supports the association of components and dependencies

The selection of each component is not supported

Supports the configuration of the feature set within the component

159. Which of the following security mechanisms can ensure that application data is not maliciously used?

Permission management

App permissions

port security

Application security

160. 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 of inserting multiple pieces of data into the database at one time?

insert (Uri uri,ValuesBucket value)

delete(Uri uri,DataAbilityPredicates predicates)

query (Uri uri ， String[ ]columns,DataAbilityPredicates predicates)

batchlnsert (Uri uri, ValuesBucket[]values)

Page 17 of 21

161. An application can have one or two HAP (HarmonyOS Abi1itPackage) packages of entry type in the same device type.

True

False

162. In HarmonyOS application development, where can commonly used backgrounds, such as common text backgrounds and button backgrounds, be placed?

graphic

media

layout

element

163. The distributed soft bus is the base for communication between various devices, which of the following does not belong to the bus hub of the distributed soft bus?

Data and Computing Center

Decision-making centre

Task Bus

Interconnection Management Center

164. Where is the data of the preference placed after persistence?

In memory

database table

file

Cloud

165. The network management module of HarmonyOS provides a data network management function, which can effectively manage HTTP caches to reduce data traffic.

True

False

166. Regarding the container components Row and Column, the following statement is wrong. The main axis of A Column container is vertical, and the cross axis is horizontal;

The main axis of the row container is horizontal, and the cross axis is vertical.

The main axis and the cross axis are always perpendicular to each other, and the direction of the Row and Column main axes is different.

The alignment of the subcomponents of the C Column in the direction of the main axis is set using the justifyContent property, and its parameter type is FlexAlign.

The alignment of D Row's subcomponents in the direction of the cross axis is set using the alignltems property, which is of type HorizontalAlign.

167. When a developer develops a news software, he will use the marquee of the Text component to realize the automatic scrolling of information, and before setting the marquee effect, he needs to set some preconditions for the Text component.

ohos:multiple_lines=false

ohos:max_text_line=1

ohos:multiple_lines=true

ohos:max_text_line=2

168. A home appliance manufacturer used HarmonyOS to produce a high-end refrigerator with a display (256MB of memory), which is not part of HarmonyOS's standard system device.

True

False

169. PositionLayout is an adaptive layout, which is mainly used in scenarios where multiple components at the same level need to automatically adjust the number of columns on different screen sizes.

True

False

170. What development tools do programmers do not need to install when developing HarmonyOS mobile apps?

HUATEI DevEco Device Tool

HiBurn

DevEco Studio

Visual Studio Code

Page 18 of 21

171. When developing a HarmonyOS application, a developer receives the following product request: If a user logs in to the same HarmonyOS account on device A and device B, the user can log in to the app on device A and synchronize the application account authentication information to account B as needed. After the account authentication information is synchronized, the user can open the application on device B and log in directly without entering the application account authentication information again.

Which of the following descriptions of this scene is correct?

The developer can do this with the help of UUIDs, because apps can use UUIDs to uniquely identify the same device during their lifetime

If the developer borrows the UUID to achieve the above requirements, the UUID logo will still exist after the application is uninstalled.

The developer can do this with the help of DVID, because the application can access and manage distributed devices based on the DVID

If you use a DVID to achieve the above functions, the DVE is strongly associated with your HarmonyOS account and application information, so you can prevent other applications from accessing the current application data.

172. Initiate pairing.

Which of the following statements about steps 1, 2, and 3 is true?

calls startBtDiscovery() to complete step 2

The order in which steps 2 and 3 are implemented can be reversed

calls the enableBt() interface to complete step 1

calls startPair() to complete step 3

173. When an engineer packages an application, DevEco Studio will package all the HAP (HarmonyOS Ability Package) modules in the project directory into the application, so if there are HAP modules in the project directory that do not need to be packaged into the application, the tool will automatically delete them and then compile and build the application.

True

False

174. In HarmonyOS, when a subscription action is performed after an out-of-order public event is published, subscribers can also receive the out-of-order public event.

True

False

175. In order to test the distributed file service functions of application A and application B, the developer installs application A and application B on both device 1 and device 2. During the test, application A on device 1 creates a distributed file X, and application B on device 2 creates a distributed file Y.

Which of the following descriptions of this scenario is wrong?

If Device 1 and Device 2 are logged in to different HarmonyoS accounts, distributed file sharing cannot be implemented

If device 1 runs out of power and causes the device to go offline, distributed file X cannot be accessed

With distributed file services, application A on device 1 is able to read and write file Y on device 2

Application A and Application B need to apply for ohos.permission.DISTRIBUTED_DATASYNC permissions to use the full functionality of the distributed file service

176. When a developer uses the Text component for development, due to the long length of the input string, the content in the middle of the text needs to be truncated with ellipses.

Which of the following codes can be used to achieve the above requirements?

ohos:truncation_mode=ellipsis_at_start

ohos: truncation_mode=auto_scrolling

ohos:truncation_mode=ellipsis_at_middle

ohos:truncation_mode=ellipsis_at_end

177. Convert various bills into image information by taking pictures, and then use text recognition technology to convert image information into character information that can be used by computers and other equipment.

In order to implement the above functions, which of the following I capabilities is most likely to be used by the developer?

Universal Character Recognition

Text and image super-resolution

Keyword extraction

Part-of-speech annotation

178. If a developer needs to use the JavaScript UI framework to display the bar chart of the month's product sales, he can use the chart component to implement this function.

True

False

179. When a developer subscribes to a public event, he processes the public event in the onReceiveEvent() callback function and writes the following code.

EventRunner runner = EventRunner.create();

MyEventHandler myHandler = new

MyEventHandler(rurner);

@Override

public void onReceiveEvent(CommonEventData

commonEventData){

final AsyncCommonEventResult

result=goAsyncCommonEvent Runnable task = new

Runnable(){

@override

pub1ic void run {

......

The action to be performed, defined by the developer

result.finishCommonEvent();

}

};

myHandler.postTask(task);

}

Gives subscribers permissions

implements asynchronous operations, which solves the problem that time-consuming operations cannot be performed on onReceiveEvent

sets the priority of ordered public events

The publisher has the permission to publish sticky public events

180. The maximum number of simultaneous activations of a Worker thread

Page 19 of 21

181. A developer needs to read the resource files in the rawfile folder, and the following code can be used to read them successfully.

Image

image(Image)findComponentByld(ResourceTable.Id_cormponent_image);

Image.setPixelMap (ResourceTable.Media hawei);

True

False

182. The Web-like development paradigm provides a series of lifecycle callback methods for custom components, which are the following lifecycle callback methods for developers to manage the internal logic of custom components?

OnAttached

Onlnit

OnPageShow

OnDestroy

183. A developer now needs to make a motion track recording application, which can report the user's location information in real time.

Which of the following is correct?

Use RequestParam.SCENE_TRAJECTORY_TRACKING settings to locate the scene

Apply for the ohos.permission.LOCATION permission only in config.json

dynamically requests user authorization only in the code ohos.permission.LOCATION

Use RequestParam.SCENE_NO_POWER settings to locate the scene

184. How to set reverse playback in attribute animation?

PlayMode.Normal B

PlayMode.Alternate

PlayMode.AlternateReverse

PlayMode.Reverse

185. The permission scope of Harmony OS refers to which applications can apply for a permission, which of the following fields does not belong to the permission open scope?

privileged

signature

restricted

deivced

186. Operations such as the display and update of the UI interface are carried out on the main thread, so the main thread is also called the UI thread.

True

False

187. Components can neither be displayed nor interact with when they are not added to a layout, so a user interface contains at least one layout.

True

False

188. HarmonyOS provides the Al capability of Instant Messaging (IM) intent, which can convert speech signals into text or commands, and identify the user's intent represented by the message content.

True

False

189. Which of the following decorators can be used to manage the state of variables in custom components?

@Component

@Entry

@State

@Link

190. HarmonyOS not only has the system capability of a single device, but also supports deployment on multiple devices with different memory sizes based on the same set of system capabilities

True

False

Page 20 of 21

191. When developing an application, a developer uses the WLAN P2P function to realize point-to-point data transmission between devices. Function 2, Create and remove groups, Function 3, Initiate a connection to the peer device.

Which of the above functions is correct in the following descriptions?

To implement function 2, you need to use the createGroup() and removeGroup() interfaces, and you need to ohos.permission.GET_WIFI_INFO permissions

In order to achieve the above functions, you need to initialize the P2P messenger through the init(), interface, and need to request ohos.permssion.GET_WIFI_INFO and ohos.premission.SET_WIFI_INFO permissions.

In order to implement feature 3, connect() needs to be used, and ohos.permission.SET_WIFI_INFO permission needs to be requested

To implement function 1, you need to use the discoverDevices() interface, and you need to request the ohos.permission.SET WIFI INFO permission

192. A developer uses the Wi-Fi "Don't Trust Hot-spot Configuration" feature provided by HarmonyOS to add a specified hot-spot to its application, making it prioritize lower than the saved hot-spot. In this case, the system will refuse to connect to the hot-spot even if it is the most suitable hot-spot after the system scan.

True

False

193. Which of the following are the lifecycle callback functions of Ability?

onCreate

onDestroy

onPageShow

onPageHide

onForeground

onBackground

194. When a developer develops a social application, he needs to develop a plug-in that generates a contact QR code. In this scenario, the developer can use the code generation Al capability provided by HarmonyOS, which can return the corresponding QR code image byte stream based on the given string information.

True

False

195. HarmonyOS not only has the system capability of a single device, but also supports deployment on multiple devices with different memory sizes based on the same set of system capabilities.

True

False

196. During the development of a HarmonyOS application, a developer needs to obtain the uplink and downlink traffic of a specified NIC.

Which of the following interfaces does the developer need?

getAllTxBytes()

getAllRxBytes()

getlfaceTxBytes(String nic)

getlfaceRxBytes(String nic)

197. Which of the services provided by the HarmonyOS Connect solution is Device Parter?

Official Documentation

Service platform

Training support

Certification Testing

198. When an engineer compiles and builds a HarmonyOS Ability Package (HAP) with debugging signature information in DevEco Studio, he or she needs to apply for a debugging certificate and profile file in advance.

SignAlg

Certpath File

Profile File

Store File

199. After the open beta version is released, how can I add additional test users?

is added directly in the current version

needs to re-release a new beta version to add users

Appended directly after the current version

Users need to be added before releasing a new beta version

200. When a developer specifies a music playback service through an intent when starting a remote service, device A (local device) can start the music playback capability of device B (remote device).

Enable remote FA (Feature Ability).

Connect to a remote PA (Particle Ability).

Start the remote PA (Particle Ability).

Particle Ability (PA) of the Guantuan

Page 21 of 21

201. In the stage model, what are the following configuration files that belong to the AppScope folder?

main_pages.json

module.json5

app.json5

package.json

202. If an engineer is about to debug a Harmony OS application on an emulator device, which of the following correct debugging processes is the following?

Check the properties of the config.json file→ the device debugging code type→ the installation method of the HarmonyOS Ability Package (HAP) package

Check the attributes of the config.json file → → the installation method of the HarmonyOS Ability Package (HAP) package

Set the code type → device HAP (HarmonyOS Ability Package) package installation method→ check the config.json file attributes

To install the HarmonyOS Ability Package (HAP) package on a device→ check the attributes of the config.json file → the debugging code type of the device

203. In JavaScript UI development, for wearable projects and TV projects, the name of the home page can be not index, and the first page in the pages configuration list is the home page; for the litewearable project, the name of the home page must be index.

True

False

204. In which configuration file is the package dependency referencing the ohpm third-party library in

package.json5

module.json5

oh-package.json5

main_pages.json

205. In the lifecycle of AbilitySlice, the onStart() callback method does not need to be rewritten.

True

False

206. Which of the following positioning capabilities does the location service subsystem of HarmonyOS provide?

WLAN location

GPS

Beidou

Base Station

207. Suppose that multiple AbilitySlice are associated in MainAbility, and multiple AbilitySlice are switched in the same page, the lifecycle of MainAbility and all AbilitySlice is synchronized.

True

False

208. If a HarmonyOS engineer needs to apply for a digital certificate to complete the application release, what are the errors in the following descriptions of digital certificates?

is issued by AppGalleryConnect

contains the public key in the key pair

Digital certificates are used to ensure the integrity of the application

format is .csr

209. The main function of EventHandler is to deliver InnerEvent events or Runnable tasks to other threads for processing.

IDLE

HIGH

LOW

IMMEDIATE

210. When a developer is developing an application, he uses DevEco Studio to create an empty Java project, but does not install Node.js separately, and can still develop the project normally.

True

False

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