Struct android_manifest::MetaData

pub struct MetaData {
    pub name: Option<String>,
    pub resource: Option<AnyResource>,
    pub value: Option<String>,
}

A name-value pair for an item of additional, arbitrary data that can be supplied to the parent component.

A component element can contain any number of <meta-data> subelements. The values from all of them are collected in a single Bundle object and made available to the component as the PackageItemInfo.metaData field.

Ordinary values are specified through the value attribute. However, to assign a resource ID as the value, use the resource attribute instead. For example, the following code assigns whatever value is stored in the @string/kangaroo resource to the "zoo" name:

XML Examples

<meta-data android:name="zoo" android:value="@string/kangaroo" />

On the other hand, using the resource attribute would assign "zoo" the numeric ID of the resource, not the value stored in the resource:

<meta-data android:name="zoo" android:resource="@string/kangaroo" />

It is highly recommended that you avoid supplying related data as multiple separate <meta-data> entries. Instead, if you have complex data to associate with a component, store it as a resource and use the resource attribute to inform the component of its ID.

XML Syntax

<meta-data android:name="string"
           android:resource="resource specification"
           android:value="string" />

Contained in

• <activity>
• <activity-alias>
• <applocation>
• <service>
• <receiver>
• <provider>

Introduced in

API Level 1

Fields

name: Option<String>

A unique name for the item. To ensure that the name is unique, use a Java-style naming convention — for example, "com.example.project.activity.fred".

resource: Option<AnyResource>

A reference to a resource. The ID of the resource is the value assigned to the item. The ID can be retrieved from the meta-data Bundle by the Bundle.getInt() method.

value: Option<String>

The value assigned to the item. The data types that can be assigned as values and the Bundle methods that components use to retrieve those values are listed in the following table: https://developer.android.com/guide/topics/manifest/meta-data-element#val

Trait Implementations

impl Clone for MetaData

fn clone(&self) -> MetaData

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MetaData

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for MetaData

fn default() -> MetaData

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for MetaData

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq<MetaData> for MetaData

fn eq(&self, other: &MetaData) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for MetaData

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>where __S: Serializer,

Serialize this value into the given Serde serializer.

impl YaDeserialize for MetaData

fn deserialize<R: Read>(reader: &mut Deserializer<R>) -> Result<Self, String>

impl YaSerialize for MetaData

fn serialize<W: Write>(&self, writer: &mut Serializer<W>) -> Result<(), String>

fn serialize_attributes( &self, source_attributes: Vec<OwnedAttribute>, source_namespace: Namespace ) -> Result<(Vec<OwnedAttribute>, Namespace), String>

impl Eq for MetaData

impl StructuralEq for MetaData

impl StructuralPartialEq for MetaData