如何在android棉花糖中获取pdf的文件路径

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

private String getPdfPath() {
    String pdfPath = null;
    String selection = MediaStore.Files.FileColumns.MIME_TYPE + "='application/pdf'";
    String[] projection = {MediaStore.Files.FileColumns.DATA};
    Uri uri = MediaStore.Files.getContentUri("external");

    Cursor cursor = getContentResolver().query(uri, projection, selection, null, null);
    if (cursor != null && cursor.moveToFirst()) {
        int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.DATA);
        pdfPath = cursor.getString(columnIndex);
        cursor.close();
    }

    return pdfPath;
}

String pdfPath = getPdfPath();
if (pdfPath != null) {
    // 处理PDF文件路径
} else {
    // 未找到PDF文件
}