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

Specify ordinary values 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:

<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.

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".
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.
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:
Type Bundle method
String: Use double backslashes (\\) to escape characters; for example, \\n and \\uxxxxx for a Unicode character getString()
Integer: For example, 100 getInt()
Boolean: Either true or false getBoolean()
Color: In the form #rgb, #argb, #rrggbb, or #aarrggbb getInt()
Float: For example, 1.23 getFloat()
introduced in:
API Level 1