onActivityResult Uri - 创建子文件夹并获取新子文件夹的 DocumentUri

Question

我在 onActivityResult 中使用我的文件选择器的结果构建 DocumentUriUsingTree。现在我拿这个 DocumentUri，建立一个 DocumentFile 来创建一个新文件夹。

onActivityResult:

if (resultCode  == RESULT_OK) {
                    
                    uri = data.getData();

                    int takeFlags = data.getFlags();
                    takeFlags &= (Intent.FLAG_GRANT_READ_URI_PERMISSION |
                            Intent.FLAG_GRANT_WRITE_URI_PERMISSION );

                    if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.O_MR1) {
                        getContext().getContentResolver().takePersistableUriPermission(uri,
                                Intent.FLAG_GRANT_READ_URI_PERMISSION |
                                        Intent.FLAG_GRANT_WRITE_URI_PERMISSION
                        );
                    }

                    DocumentFile subfolderDf = DocumentFile.fromTreeUri(this,uri);
                    subfolderDf.createDirectory("TestFolder");

                    uriDirFolder = uri.toString();
                    editor = getSharedPreferences(PREFS_NAME, MODE_PRIVATE).edit();
                    editor.putString(PREF_FILE_OBSERVER, uriDirFolder);
                    editor.apply();
}

resultUri == uriDirFolder 从 SharedPreference get-Methode

获取

Uri docUriTree = DocumentsContract.buildDocumentUriUsingTree(Uri.parse(resultUri), DocumentsContract.getTreeDocumentId(Uri.parse(resultUri)));

docTreeUri = content://com.android.externalstorage.documents/tree/3339-6133%3AStorage%20Card%2FMusic%....

DocumentFile df = DocumentFile.fromTreeUri(this, docUriTree);
DocumentFile dirDf = df.createDirectory(dirName);

dirDf 看起来像 content://com.android.externalstorage.documents/tree/3339-6133%3AStorage%....dirName

df = DocumentFile.fromTreeUri(this,dirDf.getUri());

df returns 父文件夹而不是新创建的文件夹

我需要新文件夹中的 DocumentFileUri 才能使用 OutputStream 将文件保存到其中。

我哪里做错了？

谢谢，亚历杭德罗

Answer 1

DocumentFile subfolderDf = DocumentFile.fromTreeUri(this,uri); subfolderDf.createDirectory("TestFolder");

更改为：

            DocumentFile folder = DocumentFile.fromTreeUri(this, uri);
            DocumentFile subfolder = folder.createDirectory("TestFolder");

            if ( subfolder == null )
            {
                Toast.makeText(context, "Sorry, could not create a subfolder with name TestFolder", Toast.LENGTH_LONG).show();

                return;
            }

            Toast.makeText(context, "Created a subfolder with name TestFolder: " + subfolder.getUri().toString(), Toast.LENGTH_LONG).show();

onActivityResult Uri - 创建子文件夹并获取新子文件夹的 DocumentUri

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