<category>

<category android:name="string" />

android:name

The name of the category. Standard categories are defined in the Intent class as CATEGORY_name constants. The name assigned here is 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: 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 don't declare it in your intent filter, no implicit intents can resolve your activity.

For custom categories, use the package name as a prefix so that they are unique.