android - 无法获取刚刚创建的文件的 DriveID 和 ResourceID

Question

我一直在按照 Google 的文档在 Google Drive 上创建一个文件夹，然后在其中创建一个 jpeg 文件。 How to create file

然后，我需要生成指向该文件的直接链接。我使用以下链接执行此操作:https://docs.google.com/uc?export=download&id=[File ResourceID]

文件在光盘上创建。我可以使用浏览器访问它。问题是，在 onCreateFile(DriveFolder.DriveFileResult driveFileResult) 回调或其他任何地方，我无法获得正确的 ResourceID。

private void saveFileToDrive(final Bitmap image) {
        // Start by creating a new contents, and setting a callback.
        Log.i(TAG, "Creating new contents.");
        DriveApi.newContents(mGoogleApiClient).addResultCallback(new DriveApi.OnNewContentsCallback() {

            @Override
            public void onNewContents(final DriveApi.ContentsResult result) {
                // If the operation was not successful, we cannot do anything
                // and must fail.
                if (!result.getStatus().isSuccess()) {
                    Log.i(TAG, "Failed to create new contents.");
                    return;
                }
                // Otherwise, we can write our data to the new contents.
                Log.i(TAG, "New contents created. ID:"+result.getContents().getDriveId());
                // Get an output stream for the contents.
                OutputStream outputStream = result.getContents().getOutputStream();
                // Write the bitmap data from it.
                ByteArrayOutputStream bitmapStream = new ByteArrayOutputStream();
                image.compress(Bitmap.CompressFormat.JPEG, 100, bitmapStream);
                try {
                    outputStream.write(bitmapStream.toByteArray());
                } catch (IOException e1) {
                    Log.i(TAG, "Unable to write file contents.");
                }
                // Create the initial metadata - MIME type and title.
                // Note that the user will be able to change the title later.
                MetadataChangeSet metadataChangeSet = new MetadataChangeSet.Builder()
                        .setMimeType("image/jpeg")
                        .setTitle(ds.getFujifilmOrderID()+".jpeg")
                        .build();

                Drive.DriveApi.getFolder(mGoogleApiClient, PhotoPrintOrder.this.MyRealFontFolder).createFile(mGoogleApiClient, metadataChangeSet, result.getContents()).addResultCallback(new DriveFolder.OnCreateFileCallback() {
                    @Override
                    public void onCreateFile(DriveFolder.DriveFileResult driveFileResult) {
                        Log.d(TAG, "DriveID:"+driveFileResult.getDriveFile().getDriveId());
                        Log.d(TAG, "ResourceID:"+driveFileResult.getDriveFile().getDriveId().getResourceId());

                    }
                });
            }
        });
    }

输出是这样的:

DriveID:DriveId:CAESABiGAiCMlafg_VA=

ResourceID: null

如果我关闭应用程序然后再次启动它，将列出文件夹的内容，我会得到正确的值:

DriveID:CAESHDBCeXR3by1ta0hDQ0JXRzAyWjA5UFIzUmlha0UYhAIgjJWn4P1Q

ResourceID: 0Bytwo-mkHCCBWG02Z09PR3RiakE

我尝试重新连接 GoogleApiClient、driveFileResult.getDriveFile().commitAndCloseContents()、DriveApi.requestSync()。没有什么对我有用。

如果有任何可能的帮助，我将不胜感激。

Answer 1

requestSync 异步请求同步并立即返回。它不保证同步完成，并且在同步完成之前您不能拥有非空资源 ID。