This might be so late but as a beginner this is my attempt to your above question 🙂 hope this will help you,myIntent.setType(String mimeType) input param is represent the MIME type data that u want to get in return from firing intent(here myIntent instance).
by using one of following MIME type you can force user to pick option which you desire.
Please take a Note here, All MIME types in android are in lowercase.
Here is the list of common MIME type that you can set in setType():
image/jpeg
audio/mpeg4-generic
text/html
audio/mpeg
audio/aac
audio/wav
audio/ogg
audio/midi
audio/x-ms-wma
video/mp4
video/x-msvideo
video/x-ms-wmv
image/png
image/jpeg
image/gif
.xml ->text/xml
.txt -> text/plain
.cfg -> text/plain
.csv -> text/plain
.conf -> text/plain
.rc -> text/plain
.htm -> text/html
.html -> text/html
.pdf -> application/pdf
.apk -> application/vnd.android.package-archive