java - How do I get files of particular extension? -

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i'm creating program upload backup files cloud server, want use wildcard characters upload files "*.txt" or ".jpg".

my code is:

string filewacrypt = environment.getexternalstoragedirectory().getpath() + "/backup/dmg122.jpg";

but want 

string filewacrypt = environment.getexternalstoragedirectory().getpath() + "/backup/*.jpg";


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