使用Android Studio中的Google drive API从驱动器下载文件以上传到另一个驱动器

implementation 'com.google.android.gms:play-services-auth:17.2.1'
implementation 'com.google.api-client:google-api-client-android:1.30.9'
implementation 'com.google.apis:google-api-services-drive:v3-rev20211206-1.31.0'

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />

private static final int REQUEST_CODE_SIGN_IN = 1;
private GoogleSignInClient googleSignInClient;

...

GoogleSignInOptions signInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
        .requestScopes(new Scope(DriveScopes.DRIVE_FILE))
        .build();
googleSignInClient = GoogleSignIn.getClient(this, signInOptions);

Intent signInIntent = googleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, REQUEST_CODE_SIGN_IN);

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == REQUEST_CODE_SIGN_IN && resultCode == RESULT_OK) {
        Task<GoogleSignInAccount> signInAccountTask = GoogleSignIn.getSignedInAccountFromIntent(data);
        if (signInAccountTask.isSuccessful()) {
            GoogleSignInAccount signInAccount = signInAccountTask.getResult();
            if (signInAccount != null) {
                HttpTransport httpTransport = AndroidHttp.newCompatibleTransport();
                JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
                GoogleAccountCredential credential = GoogleAccountCredential.usingOAuth2(
                        this, Collections.singleton(DriveScopes.DRIVE_FILE));
                credential.setSelectedAccount(signInAccount.getAccount());

                Drive driveService = new Drive.Builder(httpTransport, jsonFactory, credential)
                        .setApplicationName(getString(R.string.app_name))
                        .build();

                // 在这里进行文件的下载和上传操作
            }
        }
    }
}

private void downloadFile(String fileId, java.io.File destinationFile) {
    try {
        Drive.Files.Get request = driveService.files().get(fileId);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        request.executeMediaAndDownloadTo(outputStream);

        FileOutputStream fileOutputStream = new FileOutputStream(destinationFile);
        fileOutputStream.write(outputStream.toByteArray());
        fileOutputStream.close();

        Log.d(TAG, "File downloaded successfully.");
    } catch (IOException e) {
        e.printStackTrace();
    }
}

private void uploadFile(java.io.File file, String folderId) {
    try {
        File fileMetadata = new File();
        fileMetadata.setName(file.getName());
        fileMetadata.setParents(Collections.singletonList(folderId));

        FileContent mediaContent = new FileContent(null, file);

        Drive.Files.Create request = driveService.files().create(fileMetadata, mediaContent);
        request.setFields("id");
        File uploadedFile = request.execute();

        Log.d(TAG, "File uploaded successfully. File ID: " + uploadedFile.getId());
    } catch (IOException e) {
        e.printStackTrace();
    }
}