question: public static void finishShareToMessenger ( Activity activity , ShareToMessengerParams shareToMessengerParams ) { Intent originalIntent = activity . getIntent ( ) ; Set < String > categories = originalIntent . getCategories ( ) ; if ( categories == null ) { activity . setResult ( Activity . RESULT_CANCELED , null ) ; activity . finish ( ) ; return ; } if ( categories . contains ( ORCA_THREAD_CATEGORY_20150314 ) ) { Bundle appLinkExtras = AppLinks . getAppLinkExtras ( originalIntent ) ; Intent resultIntent = new Intent ( ) ; if ( categories . contains ( ORCA_THREAD_CATEGORY_20150314 ) ) { resultIntent . putExtra ( EXTRA_PROTOCOL_VERSION , MessengerUtils . PROTOCOL_VERSION_20150314 ) ; String threadToken = appLinkExtras . getString ( MessengerUtils . EXTRA_THREAD_TOKEN_KEY ) ; resultIntent . putExtra ( EXTRA_THREAD_TOKEN_KEY , threadToken ) ; } else { throw new RuntimeException ( ) ; } resultIntent . setDataAndType ( shareToMessengerParams . uri , shareToMessengerParams . mimeType ) ; resultIntent . setFlags ( Intent . FLAG_GRANT_READ_URI_PERMISSION ) ; resultIntent . putExtra ( EXTRA_APP_ID , FacebookSdk . getApplicationId ( ) ) ; resultIntent . putExtra ( EXTRA_METADATA , shareToMessengerParams . metaData ) ; resultIntent . putExtra ( EXTRA_EXTERNAL_URI , shareToMessengerParams . externalUri ) ; activity . setResult ( Activity . RESULT_OK , resultIntent ) ; activity . finish ( ) ; } else { activity . setResult ( Activity . RESULT_CANCELED , null ) ; activity . finish ( ) ; } }
target:  Finishes the activity and returns the media item the user picked to Messenger.