Answers for "react native display image fullscreen"

react native cover image in parent view

image: {
    flex: 1,
    width: '100%',
    height: '100%',
    resizeMode: 'contain',
},

react native cover image

// You want `resizeMode`
The options are 'cover' | 'contain' | 'stretch' | 'repeat' | 'center'
     
<Image
  style={{
    width: size,
    height: size,
    resizeMode: "contain", // <--
  }}
  source={...}
/>