如何获得所有可用的PDF文件在我的手机存储在android 11范围存储，而不使用管理外部存储权限

Question

我正在尝试这个代码。有人能告诉我怎么才能在我的手机存储中只得到。pdf文件吗?

protected ArrayList<String> getPdfList() {
ArrayList<String> pdfList = new ArrayList<>();
Uri collection;
final String[] projection = new String[]{
MediaStore.Files.FileColumns.DISPLAY_NAME,
MediaStore.Files.FileColumns.DATE_ADDED,
MediaStore.Files.FileColumns.DATA,
MediaStore.Files.FileColumns.MIME_TYPE,
};
final String sortOrder = MediaStore.Files.FileColumns.DATE_ADDED + " DESC";
final String selection = MediaStore.Files.FileColumns.MIME_TYPE + " = ?";
final String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("pdf");
final String[] selectionArgs = new String[]{mimeType};
if (SDK_INT >= Build.VERSION_CODES.Q) {
collection = MediaStore.Files.getContentUri(MediaStore.VOLUME_EXTERNAL);
} else {
collection = MediaStore.Files.getContentUri("external");
}

try (Cursor cursor = getContentResolver().query(collection, projection, selection, selectionArgs, sortOrder)) {
assert cursor != null;
if (cursor.moveToFirst()) {
int columnData = cursor.getColumnIndex(MediaStore.Files.FileColumns.DATA);
int columnName = cursor.getColumnIndex(MediaStore.Files.FileColumns.DISPLAY_NAME);
do {
if (new File(cursor.getString(columnData)).exists()) {
pdfList.add((cursor.getString(columnData)));
Log.d(TAG, "getPdf: " + cursor.getString(columnData));
//you can get your pdf files
}
} while (cursor.moveToNext());
}
}
return pdfList;
}

上面的代码工作良好，直到android 10与requestLegacyExternalStorage = true，但在android 11光标。movetofirst()得到假

Answer 1

将以下两行添加到清单中:

<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"
tools:ignore="ScopedStorage" />