Selecting an Android file with specific file extensions
I only need to show "pdf" files in my application when I run by default. File selection. I cannot filter file extensions.
final Intent getContentIntent = new Intent(Intent.ACTION_GET_CONTENT);
getContentIntent.setType("application/pdf");
getContentIntent.addCategory(Intent.CATEGORY_OPENABLE);
Intent intent = Intent.createChooser(getContentIntent, "Select a file");
startActivityForResult(intent, REQUEST_PDF_GET);
Selecting a file shows any files. I would like to show only PDF files. How can I filter the files shown by file selection.
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It is unknown what custom file browser applications can run. I think this is the case when it is better to give something. My approach was
a) Find all files with a specific extension on external media with something like (I was looking for the .saf extension, so you would change to .pdf accordingly):
public ArrayList<String> findSAFs(File dir, ArrayList<String> matchingSAFFileNames) {
String safPattern = ".saf";
File listFile[] = dir.listFiles();
if (listFile != null) {
for (int i = 0; i < listFile.length; i++) {
if (listFile[i].isDirectory()) {
findSAFs(listFile[i], matchingSAFFileNames);
} else {
if (listFile[i].getName().endsWith(safPattern)){
matchingSAFFileNames.add(dir.toString() + File.separator + listFile[i].getName());
//System.out.println("Found one! " + dir.toString() + listFile[i].getName());
}
}
}
}
//System.out.println("Outgoing size: " + matchingSAFFileNames.size());
return matchingSAFFileNames;
}
b) Get this result in ListView
and let the user touch the file he / she wants. You can make the list as fancy as you want - show thumbnails, plus filename, etc.
It looks like it will take a long time, but it doesn't and you then know the behavior for each device.
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