harmony(鸿蒙)Resource Access

2022-08-09
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Resource Access

Accessing Application Resources

To reference an application resource in a project, use the "$r('app.type.name')" format. app indicates the resource defined in the resources directory of the application. type indicates the resource type (or the location where the resource is stored). The value can be color, float, string, plural, or media. name indicates the resource name, which you set when defining the resource.

When referencing resources in the rawfile sub-directory, use the "$rawfile('filename')" format. Currently, $rawfile allows only the <Image> component to reference image resources. filename indicates the relative path of a file in the rawfile directory, and the file name must contain the file name extension. Note that the relative path cannot start with a slash (/).

NOTE

Resource descriptors accept only strings, such as 'app.type.name', and cannot be combined.

$r returns a Resource object. To obtain the corresponding string, use getString.

In the .ets file, you can use the resources defined in the resources directory.

Text($r('app.string.string_hello'))
    .fontColor($r('app.color.color_hello'))
    .fontSize($r('app.float.font_hello'))
}

Text($r('app.string.string_world'))
    .fontColor($r('app.color.color_world'))
    .fontSize($r('app.float.font_world'))
}

Text($r('app.string.message_arrive', "five of the clock")) // Reference string resources. The second parameter of $r is used to replace %s.
    .fontColor($r('app.color.color_hello'))
    .fontSize($r('app.float.font_hello'))
}

Text($r('app.plural.eat_apple', 5, 5)) // Reference plural resources. The first parameter indicates the plural resource, and the second parameter indicates the number of plural resources. The third parameter indicates the substitute of %d.
    .fontColor($r('app.color.color_world'))
    .fontSize($r('app.float.font_world'))
}

Image($r('app.media.my_background_image')) // Reference media resources.

Image($rawfile('test.png')) // Reference an image in the rawfile directory.

Image($rawfile('newDir/newTest.png')) // Reference an image in the rawfile directory.

Accessing System Resources

System resources include colors, rounded corners, fonts, spacing, character strings, and images. By using system resources, you can develop different applications with the same visual style.

To reference a system resource, use the "$r('sys.type.resource_id')" format. Wherein: sys indicates a system resource; type indicates the resource type, which can be color, float, string, or media; resource_id indicates the resource ID.

Text('Hello')
    .fontColor($r('sys.color.ohos_id_color_emphasize'))
    .fontSize($r('sys.float.ohos_id_text_size_headline1'))
    .fontFamily($r('sys.string.ohos_id_text_font_family_medium'))
    .backgroundColor($r('sys.color.ohos_id_color_palette_aux1'))
Image($r('sys.media.ohos_app_icon'))
    .border({color: $r('sys.color.ohos_id_color_palette_aux1'), radius: $r('sys.float.ohos_id_corner_radius_button'), width: 2})
    .margin({top: $r('sys.float.ohos_id_elements_margin_horizontal_m'), bottom: $r('sys.float.ohos_id_elements_margin_horizontal_l')})
    .height(200)
    .width(300)

Resource File Examples

The content of the color.json file is as follows:

{
    "color": [
        {
            "name": "color_hello",
            "value": "#ffff0000"
        },
        {
            "name": "color_world",
            "value": "#ff0000ff"
        }
    ]
}

The content of the float.json file is as follows:

{
    "float":[
        {
            "name":"font_hello",
            "value":"28.0fp"
        },
	{
            "name":"font_world",
            "value":"20.0fp"
        }
    ]
}

The content of the string.json file is as follows:

{
    "string":[
        {
            "name":"string_hello",
            "value":"Hello"
        },
	{
            "name":"string_world",
            "value":"World"
        },
	{
            "name":"message_arrive",
            "value":"We will arrive at %s."
        }
    ]
}

The content of the plural.json file is as follows:

{
    "plural":[
        {
            "name":"eat_apple",
            "value":[
                {
                    "quantity":"one",
                    "value":"%d apple"
                },
                {
                    "quantity":"other",
                    "value":"%d apples"
                }
            ]
        }
    ]
}