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I am trying to download a file from server, what I have in mind to get filename in json response and the content and write same in assets or on sdcard. should i go and implement same, or there can be some other way we can achieve the same.
Actually you know you control the way you expose the content from the server – you can just make the file itself (its bytes) exposed at certain url. If you need to keep the name of the file posting as json seems to be good solution.
However, there is one trick here: I don’t know how big the file you refer to is and also how reliable the network will be. For every bigger file I will recommend to implement resumable upload via byte serving. You can read about the byte serving client consumer in Android in this thread. Then just go and see on how to implement byte serving server side – it definitely depends on the platform in the only case in which I used such mechanism I actually had to mimic the byte-serving with my custom url parameter. If you need further help on server side write back and I will extend my answer.