java - 上传到 Google Drive 文件未找到异常

Question

我想以编程方式访问将包含在我的项目文件夹中的特定 Excel 电子表格，并将其上传到 Google 云端硬盘。我将电子表格包含在我的 src 文件夹中并使用以下代码:

private void saveFileToDrive() {
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                try {

                    URL fileURL = getClass().getClassLoader().getResource("Untitled spreadsheet.xlsx");
                    String filePath2 = fileURL.getPath();

                    java.io.File fileContent = new java.io.File(filePath2);
                    FileContent mediaContent = new FileContent("application/vnd.ms-excel", fileContent);

                    File body = new File();
                    body.setTitle(fileContent.getName());
                    body.setMimeType("application/vnd.ms-excel");


                    File file = service.files().insert(body, mediaContent).setConvert(true).execute();

                    if (file != null) {
                        showToast("File uploaded: " + file.getTitle());
                    }
                    else
                             ;
                } catch (UserRecoverableAuthIOException e) {

                    startActivityForResult(e.getIntent(), REQUEST_AUTHORIZATION);
                } catch (IOException e) {

                    e.printStackTrace();
                }
            }
        });
        t.start();
    }

但是，我不断收到以下 FileNotFoundException:

11-29 14:43:45.189: W/System.err(21133): java.io.FileNotFoundException: /file:/data/app/com.example.drivequickstart-2.apk!/Untitled spreadsheet.xlsx: open failed: ENOENT (No such file or directory)

有人知道是什么原因造成的吗？

编辑: 我已尝试根据以下建议修改我的代码:

private void saveFileToDrive() {
            Thread t = new Thread(new Runnable() {
                @Override
                public void run() {
                    try {

                      String mime = "application/vnd.ms-excel";
                     InputStream in = getApplicationContext().getAssets().open("Untitled spreadsheet.xlsx");
                     InputStreamContent content = new InputStreamContent(mime, in);;

                        File body = new File();
                        body.setTitle("Untitled spreadsheet");
                        body.setMimeType("application/vnd.ms-excel");


                        File file = service.files().insert(body, content).setConvert(true).execute();

                        if (file != null) {
                            showToast("File uploaded: " + file.getTitle());
                        }
                        else
                                 ;
                    } catch (UserRecoverableAuthIOException e) {

                        startActivityForResult(e.getIntent(), REQUEST_AUTHORIZATION);
                    } catch (IOException e) {

                        e.printStackTrace();
                    }
                }
            });
            t.start();
        }

但是，这给了我以下错误:

11-29 20:31:08.118: E/AndroidRuntime(9833): java.lang.IllegalArgumentException
11-29 20:31:08.118: E/AndroidRuntime(9833):     at com.google.common.base.Preconditions.checkArgument(Preconditions.java:76)
11-29 20:31:08.118: E/AndroidRuntime(9833):     at com.google.api.client.googleapis.media.MediaHttpUploader.getMediaContentLength(MediaHttpUploader.java:328)
11-29 20:31:08.118: E/AndroidRuntime(9833):     at com.google.api.client.googleapis.media.MediaHttpUploader.executeUploadInitiation(MediaHttpUploader.java:347)
11-29 20:31:08.118: E/AndroidRuntime(9833):     at com.google.api.client.googleapis.media.MediaHttpUploader.upload(MediaHttpUploader.java:266)
11-29 20:31:08.118: E/AndroidRuntime(9833):     at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:408)
11-29 20:31:08.118: E/AndroidRuntime(9833):     at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:328)
11-29 20:31:08.118: E/AndroidRuntime(9833):     at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:449)
11-29 20:31:08.118: E/AndroidRuntime(9833):     at com.example.drivequickstart.MainActivity$3.run(MainActivity.java:303)
11-29 20:31:08.118: E/AndroidRuntime(9833):     at java.lang.Thread.run(Thread.java:864)

并指向该行:File file = service.files().insert(body, content).setConvert(true).execute(); 经过仔细检查，我发现长度InputStreamContent 的值为 -1，因此问题可能起源于此。

Answer 1

您使用 Java 惯用法 ClassLoader.getResource() 从 CLASSPATH 加载资源。然而，这不是我们在 Android 上的做法。

您会将文件放在assets/ 目录或res/raw/ 中，然后使用AssetManager 检索它。或像 R.raw.untitled_spreadsheet.xlsx 这样的标识符。

参见 the official guide :

While uncommon, you might need access your original files and directories. If you do, then saving your files in res/ won't work for you, because the only way to read a resource from res/ is with the resource ID. Instead, you can save your resources in the assets/ directory.

Files saved in the assets/ directory are not given a resource ID, so you can't reference them through the R class or from XML resources. Instead, you can query files in the assets/ directory like a normal file system and read raw data using AssetManager.

However, if all you require is the ability to read raw data (such as a video or audio file), then save the file in the res/raw/ directory and read a stream of bytes using openRawResource().

用代码来说，如果将文件放在 assets/sheet.xlsx 中:

String mime = "application/vnd.ms-excel";
InputStream in = ctx.getAssets().open("sheet.xlsx");
InputStreamContent content = new InputStreamContent(mime, in);

其中 ctx 是 Context .因为 Activity 是一个 Context 你可以跳过 ctx 直接调用 getAssets() 如果你碰巧写了这个Activity 中的代码。

请注意，我没有使用 FileContent:我选择了 InputStreamContent，因为您实际上没有 java.io.File对象，但是 an input stream .

基本上，您是在询问 Drive 客户端:“从此本地流中读取字节，上传它们并使它们可以在名称 $NAME 下访问”。名称 $NAME 通过 com.google.api.services.drive.model.File 对象的 title 字段提供给服务，该字段可以是任何你喜欢的 - 我认为它也可以包括目录分隔符。

这是指向 Javadoc for Google Drive V2 的链接