google drive api示例中的错误

Question

这段代码来自google drive api示例，我试图实现这段代码，但它在行中显示了错误....Credential=GoogleAccountCredential.usingOAuth2(this,drivescopes.drive）；.....给定的错误是......GoogleAccountCredential类型中的方法usingOAuth2(Context,Collection）不适用于参数MainActivity,String......

public class MainActivity extends Activity {
static final int REQUEST_ACCOUNT_PICKER = 1;
static final int REQUEST_AUTHORIZATION = 2;
static final int CAPTURE_IMAGE = 3;

private static Uri fileUri;
private static Drive service;
private GoogleAccountCredential credential;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    credential = GoogleAccountCredential.usingOAuth2(this,
            DriveScopes.DRIVE);
    startActivityForResult(credential.newChooseAccountIntent(),
            REQUEST_ACCOUNT_PICKER);
}

@Override
protected void onActivityResult(final int requestCode,
        final int resultCode, final Intent data) {
    switch (requestCode) {
    case REQUEST_ACCOUNT_PICKER:
        if (resultCode == RESULT_OK && data != null
                && data.getExtras() != null) {
            String accountName = data
                    .getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
            if (accountName != null) {
                credential.setSelectedAccountName(accountName);
                service = getDriveService(credential);
                startCameraIntent();
            }
        }
        break;
    case REQUEST_AUTHORIZATION:
        if (resultCode == Activity.RESULT_OK) {
            saveFileToDrive();
        } else {
            startActivityForResult(credential.newChooseAccountIntent(),
                    REQUEST_ACCOUNT_PICKER);
        }
        break;
    case CAPTURE_IMAGE:
        if (resultCode == Activity.RESULT_OK) {
            saveFileToDrive();
        }
    }
}

private void startCameraIntent() {
    String mediaStorageDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES).getPath();
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US)
            .format(new Date());
    fileUri = Uri.fromFile(new java.io.File(mediaStorageDir
            + java.io.File.separator + "IMG_" + timeStamp + ".jpg"));

    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
    startActivityForResult(cameraIntent, CAPTURE_IMAGE);
}

private void saveFileToDrive() {
    Thread t = new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                // File's binary content
                java.io.File fileContent = new java.io.File(fileUri
                        .getPath());
                FileContent mediaContent = new FileContent("image/jpeg",
                        fileContent);

                // File's metadata.
                File body = new File();
                body.setTitle(fileContent.getName());
                body.setMimeType("image/jpeg");

                File file = service.files().insert(body, mediaContent)
                        .execute();
                if (file != null) {
                    showToast("Photo uploaded: " + file.getTitle());
                    startCameraIntent();
                }
            } catch (UserRecoverableAuthIOException e) {
                startActivityForResult(e.getIntent(), REQUEST_AUTHORIZATION);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    });
    t.start();
}

private Drive getDriveService(GoogleAccountCredential credential) {
    return new Drive.Builder(AndroidHttp.newCompatibleTransport(),
            new GsonFactory(), credential).build();
}

public void showToast(final String toast) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            Toast.makeText(getApplicationContext(), toast,
                    Toast.LENGTH_SHORT).show();
        }
    });
}

Answer 1

答案在问题中。

该方法需要一个Collection对象，但您传递的是一个简单的String对象。