问在android中将备份同步到google驱动器

EN

public class Synchorize extends Activity {
    static final int REQUEST_ACCOUNT_PICKER = 1;
    static final int REQUEST_AUTHORIZATION = 2;
    private static Drive service;
    private static Uri fileUri;

    private GoogleAccountCredential credential;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.synchronize);
        credential = GoogleAccountCredential.usingOAuth2(this,
                Arrays.asList(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);
                    saveFileToDrive();

                }
            }
            break;
        }

    }

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

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

                try {
                    // File's binary content
                    fileUri = Uri
                            .fromFile(new java.io.File(
                                    Environment.getDataDirectory().getPath()
                                            + "/data/com.example.note_taking/databases/notes.db"));
                    java.io.File fileContent = new java.io.File(fileUri.getPath());


                    FileContent mediaContent = new FileContent(getMimeType("db"), fileContent);

                    // File's metadata.
                    com.google.api.services.drive.model.File body = new com.google.api.services.drive.model.File();
                    body.setTitle(fileContent.getName());
                    body.setMimeType(getMimeType("db"));

                    com.google.api.services.drive.model.File file = service
                            .files().insert(body, mediaContent).execute();
                    if (file != null) {
                        Toast.makeText(getApplicationContext(),
                                "Backup Uploaded Successfully",
                                Toast.LENGTH_LONG).show();
                        finish();

                    }
                } catch (UserRecoverableAuthIOException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        });
        t.start();
    }

    public String getMimeType(String url) {
        String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(
                url);
        return mimeType;
    }
}