Question

我的应用程序想要将文件从私有应用程序文件夹复制到用户选择的SAF文件夹中创建的SAF文件夹。可以创建文件夹。

复制方法是：

public static boolean copyFileToTargetSAFFolder(Context context, String filePath, String targetFolder, String destFileName ) 
{


    Uri uri = Uri.parse(targetFolder);

    String docId = DocumentsContract.getTreeDocumentId(uri);
    Log.d("target folder uri",uri.toString());
    Log.d("target folder id",docId);
    Uri dirUri = DocumentsContract.buildDocumentUriUsingTree(uri, docId );
    Log.d("dir uri",dirUri.toString());
    Uri destUri = null;

    try
    {
        destUri = DocumentsContract.createDocument(context.getContentResolver(), dirUri, "*/*", destFileName);
        Log.d("dest uri",destUri.toString());
    } catch (FileNotFoundException e )
    {
        e.printStackTrace();

        return false;
    }

    InputStream is = null;
    OutputStream os = null;
    try {
        is = new FileInputStream(filePath);

        os = context.getContentResolver().openOutputStream( destUri, "w");

        byte[] buffer = new byte[1024];

        int length;
        while ((length = is.read(buffer)) > 0)
            os.write(buffer, 0, length);

        is.close();
        os.flush();
        os.close();

        return true;

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e)     {
        e.printStackTrace();
    }

    return false;
}

日志是：

target folder uri: content://com.android.providers.downloads.documents/tree/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2Ffoldername/document/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2Ffoldername%2Fsubfoldername

target folder id: raw:/storage/emulated/0/Download/foldername

dir uri: content://com.android.providers.downloads.documents/tree/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2Ffoldername/document/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2Ffoldername

dest uri: content://com.android.providers.downloads.documents/tree/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2Ffoldername/document/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2Ffoldername%2Ffile.txt

这确实是在文件系统上发生的事情。实际上，该文件是在父文件夹而非子文件夹中复制和创建的。这段代码来自SO的答案：

SAF - Invalid URI error from DocumentsContract.createDocument method (FileOutputStream copy)

Answer 1

我不知道这是否只是一种解决方法，但我是否替换

scikit-learn

使用

String docId = DocumentsContract.getTreeDocumentId(uri);

该方法有效。

String docId = DocumentsContract.getDocumentId(uri);

的确现在日志有

public static boolean copyFileToTargetSAFFolder(Context context, String filePath, String targetFolder, String destFileName ) 
{


    Uri uri = Uri.parse(targetFolder);

    String docId = DocumentsContract.getDocumentId(uri);
    Uri dirUri = DocumentsContract.buildDocumentUriUsingTree(uri, docId );
    Uri destUri = null;

    try
    {
       destUri = DocumentsContract.createDocument(context.getContentResolver(), dirUri, "*/*", destFileName);

    } catch (FileNotFoundException e )
    {
        e.printStackTrace();

        return false;
    }

    InputStream is = null;
    OutputStream os = null;
    try {
        is = new FileInputStream(filePath);

        os = context.getContentResolver().openOutputStream( destUri, "w");

        byte[] buffer = new byte[1024];

        int length;
        while ((length = is.read(buffer)) > 0)
            os.write(buffer, 0, length);

        is.close();
        os.flush();
        os.close();

        return true;

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e)     {
        e.printStackTrace();
    }

    return false;
}

文件已正确复制到此文件夹中。

SAF-文件写在父文件夹中，不在正确的路径中

1 个答案: