手柄 Uri

如前所述,它收到 虚拟文件Uri

给定的代码示例对我有用。希望它在您的情况下有效。

1.因此,检测google drive是否接收到此Uri。

public static File getFileFromUri(final Context context, final Uri uri) throws Exception {

if (isGoogleDrive(uri)) // check if file selected from google drive
{ 
  return saveFileIntoExternalStorageByUri(context, uri);
}else 
    // do your other calculation for the other files and return that file
   return null;
}


public static boolean isGoogleDrive(Uri uri)
{
 return "com.google.android.apps.docs.storage.legacy".equals(uri.getAuthority());
}

2.如果是,uri存储到外部路径(在这里,它的根目录u可以根据您的需要进行更改),并创建具有该uri的文件。

 public static File saveFileIntoExternalStorageByUri(Context context, Uri uri) throws 

Exception {
        InputStream inputStream = context.getContentResolver().openInputStream(uri);
        int originalSize = inputStream.available();

        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        String fileName = getFileName(context, uri);
        File file = makeEmptyFileIntoExternalStorageWithTitle(fileName);
        bis = new BufferedInputStream(inputStream);
        bos = new BufferedOutputStream(new FileOutputStream(
                file, false));

        byte[] buf = new byte[originalSize];
        bis.read(buf);
        do {
            bos.write(buf);
        } while (bis.read(buf) != -1);

        bos.flush();
        bos.close();
        bis.close();

        return file;

    }

public static String getFileName(Context context, Uri uri) 
{
  String result = null;
  if (uri.getScheme().equals("content")) {
  Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
  try {
       if (cursor != null && cursor.moveToFirst()) {
        result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
       }
      } finally {
                cursor.close();
            }
        }
        if (result == null) {
            result = uri.getPath();
            int cut = result.lastIndexOf('/');
            if (cut != -1) {
                result = result.substring(cut + 1);
            }
        }
        return result;
}


public static File makeEmptyFileIntoExternalStorageWithTitle(String title) {
        String root =  Environment.getExternalStorageDirectory().getAbsolutePath();
        return new File(root, title);
    }

getData() 用于 context.getContentResolver().openInputStream(intent.getData()) ,这将返回一个 InputStream

for more info go through this link

我想你越来越难了 Virtual File Uri

阅读更多关于 Virtual Files

来自文档

虚拟文件

• Android 7.0将虚拟文件的概念添加到存储访问框架中。虚拟文件功能允许您的 DocumentsProvider URIs 这可以与动作视图意图一起使用,即使它们没有直接的 bytecode 代表性。Android 7.0还允许您为用户文件提供其他格式,包括虚拟文件或其他文件

Uri 是否具有虚拟性

You can find sample code from DOCS Open virtual files

首先检查一下 是否具有虚拟性

private boolean isVirtualFile(Uri uri) {
    if (!DocumentsContract.isDocumentUri(this, uri)) {
        return false;
    }

    Cursor cursor = getContentResolver().query(
        uri,
        new String[] { DocumentsContract.Document.COLUMN_FLAGS },
        null, null, null);

    int flags = 0;
    if (cursor.moveToFirst()) {
        flags = cursor.getInt(0);
    }
    cursor.close();

    return (flags & DocumentsContract.Document.FLAG_VIRTUAL_DOCUMENT) != 0;
}

private InputStream getInputStreamForVirtualFile(Uri uri, String mimeTypeFilter)
    throws IOException {

    ContentResolver resolver = getContentResolver();

    String[] openableMimeTypes = resolver.getStreamTypes(uri, mimeTypeFilter);

    if (openableMimeTypes == null ||
        openableMimeTypes.length < 1) {
        throw new FileNotFoundException();
    }

    return resolver
        .openTypedAssetFileDescriptor(uri, openableMimeTypes[0], null)
        .createInputStream();
}

有关虚拟文件的更多信息,请阅读下面的文章

• Virtual Files FAQ
• Open files using storage access framework
• An Android Storage Access Framework Example