error java.io.filenotfoundexception tessdata/eng.traineddata
Solution:-
Create a folder named tessdata inside assets androidappsrcmainassets
Download eng.traineddata file from https://github.com/tesseract-ocr/tessdata
remember only to download eng.traineddata only not all of them.
After downloading paste it inside tessdata (i.e androidappsrcmainassets essdata)