如何使用Android中的MediaStore.files从内部和外部存储获取所有.pdf文件

Question

private List<PDFFileDetails> getPdfFilesFromDevice(Context context) {
List<PDFFileDetails> listOfDirectories = new ArrayList<>();
ContentResolver cr = context.getContentResolver();
Uri uriExternal = MediaStore.Files.getContentUri("external");
Uri uriInternal = MediaStore.Files.getContentUri("internal");
String[] projection = null;
String sortOrder = null; // unordered
// only pdf
String selectionMimeType = MediaStore.Files.FileColumns.MIME_TYPE + "=?";
String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("pdf");
String[] selectionArgsPdf = new String[]{mimeType};

在这里，我从内部存储中获取所有pdf，而不是从外部SD卡中获取首先，我尝试不使用SD卡，然后我插入SD卡，但SD卡没有结果

Cursor allPdfFilesCursor = cr.query(uriExternal, projection, selectionMimeType, selectionArgsPdf, sortOrder);
if (allPdfFilesCursor != null && allPdfFilesCursor.getCount() != 0) {
allPdfFilesCursor.moveToFirst();
do {
int dataColumn = allPdfFilesCursor.getColumnIndex(MediaStore.Files.FileColumns.DATA);
String filePath=allPdfFilesCursor.getString(dataColumn);              
} while (allPdfFilesCursor.moveToNext());
}

内部或外部存储没有结果

allPdfFilesCursor = cr.query(uriInternal, projection, selectionMimeType, selectionArgsPdf, sortOrder);
if (allPdfFilesCursor != null && allPdfFilesCursor.getCount() != 0) {
allPdfFilesCursor.moveToFirst();
do {
int dataColumn = allPdfFilesCursor.getColumnIndex(MediaStore.Files.FileColumns.DATA);
String filePath=allPdfFilesCursor.getString(dataColumn);
} while (allPdfFilesCursor.moveToNext());
}
if (allPdfFilesCursor != null && !allPdfFilesCursor.isClosed()) {
allPdfFilesCursor.close();
}
return listOfDirectories;
}

Answer 1

可能已经晚了，但我终于得到了您要求的多文件扩展名(如.doc、pdf、xls(的解决方案。

String pdf = MimeTypeMap.getSingleton().getMimeTypeFromExtension("pdf");
String doc = MimeTypeMap.getSingleton().getMimeTypeFromExtension("doc");
String docx = MimeTypeMap.getSingleton().getMimeTypeFromExtension("docx");
String xls = MimeTypeMap.getSingleton().getMimeTypeFromExtension("xls");
String xlsx = MimeTypeMap.getSingleton().getMimeTypeFromExtension("xlsx");
String ppt = MimeTypeMap.getSingleton().getMimeTypeFromExtension("ppt");
String pptx = MimeTypeMap.getSingleton().getMimeTypeFromExtension("pptx");
String txt = MimeTypeMap.getSingleton().getMimeTypeFromExtension("txt");
String rtx = MimeTypeMap.getSingleton().getMimeTypeFromExtension("rtx");
String rtf = MimeTypeMap.getSingleton().getMimeTypeFromExtension("rtf");
String html = MimeTypeMap.getSingleton().getMimeTypeFromExtension("html");
//Table
Uri table = MediaStore.Files.getContentUri("external");
//Column
String[] column = {MediaStore.Files.FileColumns.DATA};
//Where
String where = MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?"
+" OR " +MediaStore.Files.FileColumns.MIME_TYPE + "=?";
//args
String[] args = new String[]{pdf,doc,docx,xls,xlsx,ppt,pptx,txt,rtx,rtf,html};
Cursor fileCursor = getActivity().getContentResolver().query(table, column, where, args, null);
while (fileCursor.moveToNext()) {
//your code 

}