Android :: Remove Temp Files

I am writing a file browser app. I mean all the available files in the sdcard will be shown as a list.

while browsing the sdcard, some temp files also listed ( I guess these files are temp, because when I try to open those files, my app get crashed).

How can I remove these temp files programmatically.

and I want to know the specific format of the temp file, I mean temp file starts with so and so character or ends with so and so character... something like that.

And also I want to know the location of the temp files.