harmony 鸿蒙File Organization

2023-06-24
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File Organization

Directory Structure

The following figure shows the typical directory structure of the JavaScript module (entry/src/main/js/module) for an application with feature abilities (FA) using JavaScript APIs.

Figure 1 Directory structure

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Functions of the files are as follows:

.hml files describe the page layout.
.css files describe the page style.
.js files process the interactions between pages and users.

Functions of the folders are as follows:

The app.js file manages global JS logics and application lifecycle.
The pages directory stores all component pages.
The common directory stores public resource files, such as media resources and .js files.
The i18n folder stores resources in different languages, for example, UI strings and image paths.

NOTE

The i18n folder is a reserved one and cannot be renamed.

The folders marked as optional in the directory structure can be created as needed after you create the project in DevEco Studio.

File Access Rules

Application resources can be accessed via an absolute or relative path. In this development framework, an absolute path starts with a slash (/), and a relative path starts with ./ or ../. The rules are as follows:

To reference a code file, use a relative path, for example, ../common/utils.js.
To reference a resource file, use an absolute path, for example: /common/xxx.png.
Store code files and resource files in the common directory and access the files in a required fashion.
In a .css file, use the url() function to create a URL, for example, url(/common/xxx.png).

NOTE

When code file A needs to reference code file B:

If code files A and B are in the same directory, you can use either a relative or absolute path in code file B to reference resource files.

If code files A and B are in different directories, you must use an absolute path in code file B to reference resource files, because the directory of code file B changes during Webpack packaging.

Media File Formats

Table 1 Supported image formats

Format	Supported Version	File Name Extension
BMP	API version 4+	.bmp
JPEG	API version 4+	.jpg
PNG	API version 4+	.png

Storage Directory

Since API version 5, the <image> component supports access to images in the private directory of an application.

Directory Type	Prefix	Access Visibility	Description
Private directory of the application	internal://app/	Current application only	The directory is deleted when the application is uninstalled. Access to the parent directory using ../ is prohibited.