Firestore Tutorial Part 9 – SIMPLE QUERIES – Android Studio Tutorial



In part 9 of the Firestore tutorial we filter our queries by calling a where method on our CollectionReference, like whereEqualTo or whereGreaterThanOrEqualTo. Into these methods we pass the key of the field in the document, and the value we want to filter for.
We can also order these results with the orderBy method, where we can pass Query.Direction.DESCENDING to get our results in descending instead of ascending order.
Lastly we will use the limit method to only retrieve a certain number of results.
We can add all these queries before the get method or before the addSnapshotListener method.

Watch the whole playlist:

Code for this part:
https://gist.github.com/codinginflow/1c6e3bd4e4be3790041d3f4f989ef50b

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Mourad ELGORMA

Fondateur de summarynetworks, passionné des nouvelles technologies et des métiers de Réseautique , Master en réseaux et système de télécommunications. ,j’ai affaire à Pascal, Delphi, Java, MATLAB, php …Connaissance du protocole TCP / IP, des applications Ethernet, des WLAN …Planification, installation et dépannage de problèmes de réseau informatique……Installez, configurez et dépannez les périphériques Cisco IOS. Surveillez les performances du réseau et isolez les défaillances du réseau. VLANs, protocoles de routage (RIPv2, EIGRP, OSPF.)…..Manipuler des systèmes embarqués (matériel et logiciel ex: Beaglebone Black)…Linux (Ubuntu, kali, serveur Mandriva Fedora, …). Microsoft (Windows, Windows Server 2003). ……Paquet tracer, GNS3, VMware Workstation, Virtual Box, Filezilla (client / serveur), EasyPhp, serveur Wamp,Le système de gestion WORDPRESS………Installation des caméras de surveillance ( technologie hikvision DVR………..). ,

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