Issues traversing through directory hierarchy with Android Storage Access Framework / DocumentProvider using MTP

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I am using your code to go in sub folders with adding lines:

Uri childrenUri;
try {
    //for childs and sub child dirs
    childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(uri, DocumentsContract.getDocumentId(uri));
} catch (Exception e) {
    // for parent dir
    childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(uri, DocumentsContract.getTreeDocumentId(uri));
}

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