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.
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.
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.
Sampling refers to the process of sampling a digital signal in a continuous time domain at certain time intervals to obtain a discrete signal in the discrete time domain.
Huawei's latest mobile phones、HarmonyOS system is pre-installed in the smart screen.Among them, the mobile phone does not belong to the HarmonyOS large system device.The smart screen belongs to the large system device。
HarmonyOS provides access to external storage devices, such as USB flash drives, SD cards, etc.
If a developer wants to develop a file background download function, there needs to be a Page Ability to provide U pages, and a Service Ability to provide the background file download function. If you want to perform some operations after connecting to the Service Ability in the Page Ability, you need to implement the onAbilityConnectDone() method in the Page Ability.
A developer needs to use the JavaScript UI framework to display the bar chart of the current month's product sales, and can use the chart component to achieve this function.
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.
On the basis of the supported input events, HarmonyOS's multi-dimensional input defines some input actions commonly used by users as a set of standardized events, maps the input events of different input devices to the standardized events, and can obtain a unified experience when using multiple input devices to operate different terminal devices or applications.
When a developer uses mobile phones and smart screens to develop applications, he can select two device types, smartphones and smart screens, in the AppGallery project.
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.
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.
AbilitySlice and Page have the same lifecycle state and callback method with the same name, and when the Lifecycle of the Page changes, the same lifecycle change will occur in AbilitySlice. Similarly, as the lifecycle of an AbilitySlice changes, the lifecycle state of a Page changes.
When a developer compiles a project, the compilation fails, and the message "This device type does not match project profile" is displayed, because the device type configured in "config.json" does not match the device type for debugging, and "deviceType" needs to be configured in the "module" tag.
The global search portal provided on HarmonyOS has a desktop drop-down search box or a negative screen search box.
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.
In order to improve the image quality of network source images, developers can use the Instant Messaging (IM) class intent recognition interface provided by HarmoyOS.
Although a Page can contain multiple AbilitySlices, when a Page enters the foreground, the interface displays only one Abilitylice by default.
The input division method of HarmonyOS is different from that of traditional operating systems, and multi-dimensional inputs will be integrated, so that developers can use application frameworks, UI components or interfaces that come with the system to implement applications with multi-dimensional and natural interaction characteristics.
When using EventHandler to implement inter-thread communication, if EventRunner takes out the Runnable task, it will trigger the callback method of EventHandler and the processing method of EventHandler.
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.
AR (HarmonyOSAbilityResources) Different HAPs (HarmonyOSAbilityPackage), HAR cannot be installed and run on the device independently, and can only be referenced as a dependency of the application module.
In multiple distributed devices with the same HarmonyOS account, after logging in to an app, the app can synchronize the app account authentication information (account name, token or other) to other devices as needed.
When using EventHandler to implement inter-thread communication, if the callback method of EventHandler and the processing method of EventHandler are used.
In a HarmonyOS application, there must be one and only one HAP of the feature type.
When a developer is developing a HarmonyOS application, if part of the text in the value field of the JSON resource files of different types of elements in the Element directory does not need to be processed by the translator and will not be displayed on the application interface, a special structure can be used to identify the content that does not need to be translated
Frame rate is the frequency (rate) at which a bitmap image appears continuously on a display in frames, measured in hertz (Hz).
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);
In JavaScript UI development, for wearable projects and TV projects, the name of the homepage can be not index, and the first page in the pages configuration list is the homepage; for the litewearable project, the name of the homepage must be index.
The lightweight preference database is a non-relational database, which mainly provides lightweight key-value operations and supports local applications to store a large amount of data. If a HarmonyOS developer uses a lightweight preference database to save data, the data will be stored in a local file and will not be loaded into memory.
Distributed data services can isolate data belonging to different applications to ensure that data between different applications cannot be accessed to each other through distributed data services.
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.
After the page is jumped or overwritten, it will enter the INACTIVE state, but the resources will not be released, and when the page switches back to the ACTIVE state, the click event will still respond normally.
The atomic service consists of one or more HAP packets, andone HAP packet corresponds to one FA or one PA. Each FA or PA can be operated independently to perform 1 specific function.
The network management module of HarmonyOS can realize the communication between different processes of the machine, and the communication supports streaming socket technology.
In HarmonyOS, by default, the UI interface is displayed and updated in the main thread
HarmonyOS supports entity recognition, which can highlight relevant entity information and set up quick operation entrances. For example, the phone number in this message will be highlighted, and the user can dial it directly.
MATCH_CONTENT indicates that the component size will expand to the maximum allowed by the parent component and occupy the remaining size in the direction of the parent component
When an Intent is used to initiate a request, if both BundleName and Abilitylame are specified, the application can be started directly according to the full name of the Ability (for example, "com.demcapp.FooAbility").
In order to improve the user experience, a developer uses ScrollView to realize the scrolling display of photos in an album application, and in order to improve the user experience, the developer sets the ScrollView rebound_effect property to true, so that the photo has a rebound effect when sliding to the bottom.
The ListContainer grid layout can be realized through the setLayoutManager() method
Service is running in the background, and users want the application to keep running all the time when playing music, and the foreground Service cannot be used at this time.
In HarmonyOS's "1+8+N" strategy, smart microwave oven devices belong to "N" devices.
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.
The user application package of HarmonyOS may not contain a HAP package of the feature type.
When MainAbility and MainAbiitySlice are bound together, the lifecycles of the two are synchronized, including the callback method for transitioning between states.
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.
When a developer has multiple versions of the object-relational mapping database, and the developer calls the BookStoreUpgrade class to upgrade the database version, the version number of the BookStoreUpgrade class is configured as "2", and the actual version number of the current BookStore.db is "1".
When a developer calls HarmonyOS Abi1ity Resources (HAR) in an application module, he or she needs to merge the config.json file of HAP and the config.json file of HAR into a single config.json file when compiling and building a HarmonyS Ability Package (HAP). During the merging process, under what circumstances will the values of tags conflict?
Which of the following modules does a developer need to call to check whether the HarmonyOS cellular data service is enabled?
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?
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?
Which of the following interfaces can repeatedly call a function with a fixed time delay between each call?
A developer usestheAI capabilities provided by Harmony OS to achieve the following functions: 1. Perform text detection and recognition of image sources such as document remakes and street view reproductions, and provide translation, search and other related services based on the recognition results. 2. 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?
A developer defines an entity class Student.java and uses the following code to construct a teaching table:
Entity(tableName="student",ignoredColums =["ignoredColumn1"," ignoredColumn2", indices =(@Index(value =("firstName." ,"lastName",name="name_index", unique = true)))
Public class User extends OrmObject{
@PrimaryKey(autoGenerate= true)
Private Integer userld;
Private String firstName;
Private String lastName;
Private int age;
Private double balance;
Private int ignoredColumnl;
Private int ignoredColumn2;
}
Which of the following descriptions of this code is wrong?
When the developer jumps to a new page through the button button, the following code is created. If you don't add "" Button button = (Button) findComponentByld(ResourceTable.ld_button) ;" What happens to this line of code?
Public void onStart(Intent intent){
super.onStart(intent);
super.setUlContent
(ResourceTable.Layout_ability_main);
Button button =
(Button)findComponentByld(ResourceTable.ld_button);
button.setClickedListener(listener -> present(new
SecondAbilitySlice(),new Intent()));
}
If a developer wants to use the HarmonyOS speech recognition function, which of the following subsystems will he use?
When a developer is developing a game application, in order to display the download progress of game resources, it is necessary to use a horizontal linear progress bar, which of the following components can help the developer complete this function?
Which of the following is NOT part of the software exposure capabilities provided by HarmonyOS Connect?
A developer obtains a log content: static finalHiLogLabel LABEL = new HiLogLabe1
(HiLog.LOG_APP,Ox00201, "MY_TAG"); Which of the following information can't be obtained?
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?
The user migrates the video on the mobile phone to the smart screen for playback, and after the mobile phone saves the data, the smart screen calls back which of the following methods is used to recover the data?
When a developer specifies a music playback service through an intent when closing a remote service, the developer can realize the ability to disable music playback on remote devices.
After the creation of a custom component of the Web development paradigm, which of the following callbacks will be triggered when it is added to the Page component tree?
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?
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.?
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 distributed task scheduling, if a developer needs to coordinate access from multiple devices, what field in config.json does a developer need to apply for permission?
When a developer needs to specify the exact coordinates of the x-axis and y-axis of a sub-component when laying out a component, which layout can be used to achieve this function?
In a HarmonyOS application, which of thefollowing and the ComponentContainer object are actually composed of the interface elements that the user sees?
When an engineer needs to add the function of recording video when developing an application, which of the following interfaces should be called?
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?
In the HarmonyOSsystem architecture, which of the following provides unified peripheral access capabilities and driver development management framework?
When developing a HarmonyOSapplication, what methods do I need to call when migrating the FA (Feature Ability) on device A to device B?
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?
When a developer needs to create a Service Ability when developing a background service, which of the following processes is NOT the step to create the Ability?
HarmonyOS's AI capability provides the function of generating QR codes, for example, if you need to generate a QR code for each mobile phone contact, which of the following describes the QR code correctly?
The developer uses device A (local device) to control device B (remote device) to open the album, which distributed task scheduling capability is used in this scenario?
Which of the following descriptions of the HarmonyOSclipboard function is correct?
Which option is not the process of decoding in the conversion of the following information?
A developer defines an entity class
Student.java and use the following code to construct the table:
@Entity(tableName ="student", ignoredColums
=["ignoredColumn1","ignoredColumn2", indices
= (@Index(value =("firstName.","lastName",
name="name_index", unique = true)))
pub1ic class User extends OrmObject{
@PrimaryKey(autoGenerate= true)
private Integer userld;
private String firstName;
private String lastName;
private int age;
private doub1e balance;
private int ignoredColumn1;
private int ignoredColumn2;
}
Which of the following descriptions of this code is wrong?
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 key generated by the developer contains the public key and the private key used in asymmetric encryption, and in what format is the key stored in the key file?
TaskDispatcher is the basic interface for Ability to distribute tasks, which hides the implementation details of the thread where the task is located. To ensure that the application is more responsive, we respond to the priority of the design task, which of the following is not the priority of the task?
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?
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?
The HarmonyOS video module supports the development of video services and the opening of the ecosystem, allowing developers to easily play, operate, and develop new functions of video media through the open interfaces. Video playback includes playback controls, playback settings, and playback queries, such as start/stop playback, playback speed settings, and whether to loop playback. When developing a video playback feature, which of the following steps is correct?
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?
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?
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.
A developer is developing a ticket booking application, in the selection of the location of the ticket, you need to use the slide selector Picker, in order to highlight the selected text, the developer sets the rendering effect that the selected text margin is greater thanthe ordinary text margin. Which of the following settings are correct?
A developer is developing an online education application, and there are multiple choice questions and multiple choice questions in the studentAnswer:interface, which of the following components is suitable for displaying multiple choice questions?
What is the process of cross-terminal migration from an application on HarmonyOS device A to the application on device B by calling the distributed task scheduling capability to continue sbility?
Developers will use the UI framework provided by Harmony OS when developing mobile phone pages, which of the following is not a UI framework?
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?
When a developer designs a PA (Particle Ability) application, which of the following development steps can be omitted?
How do I define the permissionscorrectly when a developer needs to customize the permissions for the Harmony OS third-party application?
If a developer wants to stop the service in a Service, which of the following APIs needs to be called?
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)})
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 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.
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TESTED 30 Apr 2024
