Importaciones no resueltas de Google Drive

Estoy intentando compilar el código de ejemplo de Stephen Wylie para la integración de Google Drive:

package com.googledrive.googledriveapp; // For Google Drive / Play Services // Version 1.1 - Added new comments & removed dead code // Stephen Wylie - 10/20/2012 import android.accounts.Account; import android.accounts.AccountManager; import android.app.Activity; import com.google.android.gms.auth.GoogleAuthException; import com.google.android.gms.auth.GoogleAuthUtil; import com.google.android.gms.auth.UserRecoverableAuthException; import com.google.android.gms.common.AccountPicker; import com.google.api.client.auth.oauth2.BearerToken; import com.google.api.client.auth.oauth2.Credential; import com.google.api.client.extensions.android2.AndroidHttp; import com.google.api.client.googleapis.extensions.android2.auth.GoogleAccountManager; import com.google.api.client.http.HttpRequestFactory; import com.google.api.client.http.HttpTransport; import com.google.api.client.http.json.JsonHttpRequest; import com.google.api.client.http.json.JsonHttpRequestInitializer; import com.google.api.client.json.jackson.JacksonFactory; import com.google.api.services.drive.Drive; import com.google.api.services.drive.Drive.Files; import com.google.api.services.drive.DriveRequest; import com.google.api.services.drive.DriveScopes; import com.google.api.services.drive.model.File; import com.google.api.services.drive.model.FileList; public class MainActivity extends Activity { private Button btn_drive; private Context ctx = this; private Activity a = this; public void onCreate(Bundle savedInstanceState) { /* * Etc... (Other application logic belonging in onCreate) */ btn_drive.setOnClickListener(new OnClickListener() { public void onClick(View v) { chooseAccount(); } }); } public void chooseAccount() { Intent intent = AccountPicker.newChooseAccountIntent(null, null, new String[]{"com.google"}, false, null, null, null, null); startActivityForResult(intent, CHOOSE_ACCOUNT); } // Fetch the access token asynchronously. void getAndUseAuthTokenInAsyncTask(Account account) { AsyncTask<Account, String, String> task = new AsyncTask<Account, String, String>() { ProgressDialog progressDlg; AsyncTask<Account, String, String> me = this; @Override protected void onPreExecute() { progressDlg = new ProgressDialog(ctx, ProgressDialog.STYLE_SPINNER); progressDlg.setMax(100); progressDlg.setTitle("Validating..."); progressDlg.setMessage("Verifying the login data you entered...\n\nThis action will time out after 10 seconds."); progressDlg.setCancelable(false); progressDlg.setIndeterminate(false); progressDlg.setOnCancelListener(new android.content.DialogInterface.OnCancelListener() { public void onCancel(DialogInterface d) { progressDlg.dismiss(); me.cancel(true); } }); progressDlg.show(); } @Override protected String doInBackground(Account... params) { return getAccessToken(params[0]); } @Override protected void onPostExecute(String s) { if (s == null) { // Wait for the extra intent } else { MyApp.accountName = s; getDriveFiles(); } progressDlg.dismiss(); } }; task.execute(account); } /** * Fetches the token from a particular Google account chosen by the user. DO NOT RUN THIS DIRECTLY. It must be run asynchronously inside an AsyncTask. * @param activity * @param account * @return */ private String getAccessToken(Account account) { try { return GoogleAuthUtil.getToken(ctx, account.name, "oauth2:" + DriveScopes.DRIVE_READONLY); // IMPORTANT: DriveScopes must be changed depending on what level of access you want } catch (UserRecoverableAuthException e) { // Start the Approval Screen intent, if not run from an Activity, add the Intent.FLAG_ACTIVITY_NEW_TASK flag. a.startActivityForResult(e.getIntent(), REQUEST_TOKEN); e.printStackTrace(); return null; } catch (GoogleAuthException e) { e.printStackTrace(); return null; } catch (IOException e) { e.printStackTrace(); return null; } } private Drive getDriveService() { HttpTransport ht = AndroidHttp.newCompatibleTransport(); // Makes a transport compatible with both Android 2.2- and 2.3+ JacksonFactory jf = new JacksonFactory(); // You need a JSON parser to help you out with the API response Credential credential = new Credential(BearerToken.authorizationHeaderAccessMethod()).setAccessToken(MyApp.accountName); HttpRequestFactory rf = ht.createRequestFactory(credential); Drive.Builder b = new Drive.Builder(ht, jf, null); b.setJsonHttpRequestInitializer(new JsonHttpRequestInitializer() { @Override public void initialize(JsonHttpRequest request) throws IOException { DriveRequest driveRequest = (DriveRequest) request; driveRequest.setPrettyPrint(true); driveRequest.setOauthToken(MyApp.accountName); } }); return b.build(); } /** * Obtains a list of all files on the signed-in user's Google Drive account. */ private void getDriveFiles() { Drive service = getDriveService(); Log.d("SiteTrack", "FUNCTION getDriveFiles()"); Files.List request; try { request = service.files().list(); // .setQ("mimeType=\"text/plain\""); } catch (IOException e) { e.printStackTrace(); return; } do { FileList files; try { Log.d("SiteTrack", request.toString()); files = request.execute(); } catch (IOException e) { e.printStackTrace(); Log.d("SiteTrack", "Exception"); return; } List<File> fileList = files.getItems(); Log.d("SiteTrack", "Files found: " + files.getItems().size()); for (File f : fileList) { String fileId = f.getId(); String title = f.getTitle(); Log.d("SiteTrack", "File " + fileId + ": " + title); } request.setPageToken(files.getNextPageToken()); } while (request.getPageToken() != null && request.getPageToken().length() >= 0); } protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) { if (requestCode == CHOOSE_ACCOUNT && resultCode == RESULT_OK) { MyApp.accountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME); GoogleAccountManager gam = new GoogleAccountManager(this); getAndUseAuthTokenInAsyncTask(gam.getAccountByName(MyApp.accountName)); Log.d("SiteTrack", "CHOOSE_ACCOUNT"); } else if (requestCode == REQUEST_TOKEN && resultCode == RESULT_OK) { MyApp.accountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME); Log.d("SiteTrack", "REQUEST_TOKEN"); } } } 

Sin embargo, estoy recibiendo errores "no se pueden resolver" en todas las importaciones de com.google. Tengo API de Google 16 y lo he establecido como mi objetivo de creación de proyecto. ¿Alguien sabe cuál es el problema?

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