Android/IntentScondaryAttributes

There are four types of secondary attributes:


 * category: Gives additional information about the action to execute. For example,  LAUNCHER_CATEGORY means it should appear in the Launcher as a top-level  application, while ALTERNATIVE_CATEGORY means it should be included in a list of  alternative actions the user can perform on a piece of data.  type: Specifies an explicit type (a MIME type) of the intent data. Normally, the


 * type is inferred from the data itself. By setting this attribute, you disable that  evaluation and force an explicit type.


 * component: Specifies an explicit name of a component class to use for the intent.  Normally this is determined by looking at the other information in the intent (the  action, data/type, and categories) and matching that with a component that can  handle it. If this attribute is set, none of the evaluation is performed, and this  component is used exactly as is. By specifying this attribute, all the other intent attributes become optional.


 * extras: A bundle of any additional information. This can be used to provide   extended information to the component. For example, if we have an action to send an e-mail message, we could also include extra pieces of data here to supply a subject, body, and so on.