question: I am a java background programmer, responsible for providing interfaces to APP calls. Now a certain interface on the app side needs to display some pictures, and these pictures are stored in the database as a byte array (binary), so how should I provide an interface to the app side? Return the byte array of the picture and let android convert it to the picture itself? I hope those great gods who have written the interface to the app end will give some suggestions, thank you very much!