Implement defaultSource for Image on Android

[brentvatne]

Background: #5074 (comment)

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[kristjanmik]

@nicklockwood Do we want the defaultSource property to be implemented on Android as well? We need some mechanism to handle fallback images on Android. I could give it a shot if wanted.

[nicklockwood]

@kristjanmik we're still discussing it. I'm not sure if it's needed on iOS since you can implement the same functionality with the onLoad event, but apparently that doesn't work correctly on Android?

If you do decided to implement it, I believe the intended (but currently broken) behavior on iOS is that it should appear when the image first starts loading, and disappear when it's replaced by the correct image. If the image never loads, or loads with an error, it will stay indefinitely.

[mkonicek]

Hi there! This issue is being closed because it has been inactive for a while.

But don't worry, it will live on with ProductPains! Check out its new home: https://productpains.com/post/react-native/implement-defaultsource-for-image-on-android

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