Android API Guides 之 App Manifest（6） - <category>

OnePieceMan

于 2014-04-06 21:10:02 发布

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本文深入探讨了Android应用中Intent Filters和Categories的概念，解释了如何通过配置Intent Filters来实现活动之间的交互，强调了包含Category Default的重要性，以及自定义Category的规范。

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<category>

SYNTAX:

<category android:name="string" />

CONTAINED IN:

<intent-filter>

DESCRIPTION:

Adds a category name to an intent filter. See Intents and Intent Filters for details on intent filters and the role of category specifications within a filter.

ATTRIBUTES:

android:name

The name of the category. Standard categories are defined in the Intent class as CATEGORY_nameconstants. The name assigned here can be derived from those constants by prefixing " android.intent.category." to the name that follows CATEGORY_. For example, the string value for CATEGORY_LAUNCHER is " android.intent.category.LAUNCHER".

Note: In order to receive implicit intents, you must include the CATEGORY_DEFAULT category in the intent filter. The methods startActivity() and startActivityForResult() treat all intents as if they declared the CATEGORY_DEFAULT category. If you do not declare it in your intent filter, no implicit intents will resolve to your activity.

Custom categories should use the package name as a prefix, to ensure that they are unique.

INTRODUCED IN:

API Level 1