CalendarContract に記載されているとおり:
/**
* Activity Action: Display the event to the user in the custom app as
* specified in {@link EventsColumns#CUSTOM_APP_PACKAGE}. The custom app
* will be started via {@link Activity#startActivityForResult(Intent, int)}
* and it should call {@link Activity#setResult(int)} with
* {@link Activity#RESULT_OK} or {@link Activity#RESULT_CANCELED} to
* acknowledge whether the action was handled or not.
*
* The custom app should have an intent-filter like the following
* <pre>
* {@code
* <intent-filter>
* <action android:name="android.provider.calendar.action.HANDLE_CUSTOM_EVENT" />
* <category android:name="android.intent.category.DEFAULT" />
* <data android:mimeType="vnd.android.cursor.item/event" />
* </intent-filter>
* }
* </pre>
* <p>
* Input: {@link Intent#getData} has the event URI. The extra
* {@link #EXTRA_EVENT_BEGIN_TIME} has the start time of the instance. The
* extra {@link #EXTRA_CUSTOM_APP_URI} will have the
* {@link EventsColumns#CUSTOM_APP_URI}.
* <p>
* Output: {@link Activity#RESULT_OK} if this was handled; otherwise
* {@link Activity#RESULT_CANCELED}
*/
// @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) public static final String ACTION_HANDLE_CUSTOM_EVENT = "android.provider.calendar.action.HANDLE_CUSTOM_EVENT";