The documentation says you can specify a custom category.
You can specify categories in your applications manifest that lets the system know that you application can handle the intent category. For example, by putting a ALTERNATIVE category, other apps in the system know that your app can handle that category without specifically knowing the action name!
Categories are used for implicit Intents. So, If your Activity can be started by an implicit Intent when no other specific category is assigned to activity, activity's Intent filter should include this category. (even if you have other categories in the Intent filter).
You can choose a category and add tags to your app or game in Play Console. Categories and tags help users to search for and discover the most relevant apps in the Play Store. Users can view apps by using a browser and the Google Play app.
category -- Gives additional information about the action to execute. For example, CATEGORY_LAUNCHER means it should appear in the Launcher as a top-level application, while CATEGORY_ALTERNATIVE means it should be included in a list of alternative actions the user can perform on a piece of data.
The way I understand it, categories are public directives to the android operating system(and other apps) that represent different categories that your app should be a part of.
Example
HOME
category -- and if so it displays it in the app drawer. However, there's more. You can specify categories in your applications manifest that lets the system know that you application can handle the intent category. For example, by putting a ALTERNATIVE
category, other apps in the system know that your app can handle that category without specifically knowing the action name! In the following example, custom intent categories are passed through this intent, which is filtered and the corresponding object gets edited(taken from the Notes example app):
<intent-filter android:label="@string/resolve_title">
<action android:name="com.android.notepad.action.EDIT_TITLE" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.ALTERNATIVE" />
<category android:name="android.intent.category.SELECTED_ALTERNATIVE" />
<data android:mimeType="vnd.android.cursor.item/vnd.google.note" />
</intent-filter>
By registering this intent filter in an <activity />
tag, you can edit a "note". The intent data would contain the note, and the intent would get routed to the activity that this filter is registered in.
In Conclusion:
There isn't really a reason you'd use a custom category. They are for Android, and thus don't really make sense in application use. But, if you choose to use them, they can be used in the methods described above. "They provide some specific semantic rules, and if those rules are useful to you then feel free to use them"(Hackbod).
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