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Q: 

BitmapFactory.decodeByteArray(data, offset, length) return null value.

where data is array of byte(pixel data) which i have retrieved from another container file.But I am not sure whether it contain only jpeg pixel data, or pixel data + header part.

  1. How to find out whether data contain both( header part + pixel data) or not? Or
  2. what is wrong with that data?

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