Question

After looking thru lots of pages (mostly contradict) I’m not able to write a simple Android app that does connect to Google with OAuth2:

I started with this page:

https://developers.google.com/google-apps/tasks/oauth-and-tasks-on-android#account

I did download the current libs and had to experience lots of deprecated or missing functions:

• GoogleAccountManager is deprecated
• HttpTransport, AndroidHttp, AccessProtectedResource, GoogleAccessProtectedResource, JacksonFactory will not be found in the current libs
• Generation of CLIENT_ID thru Developer Console worked
• Generation of SECRET did not work for Mobile App but is required

What is the most current description? What’s the most current demo?

Just in case – here’s what I did so far. None of the methods in processTokenReceived are part of the libs:

public class ActivityMain extends Activity implements DialogInterface.OnClickListener {

    private static final String AUTH_TOKEN_TYPE = "oauth2:https://www.googleapis.com/auth/drive";
    private static final String CLIENT_ID = "xxxxxxxxxxxx.apps.googleusercontent.com";

    private AccountManager accountManager;
    private Account[] accounts;
    private String authName;
    private String authToken;

    @Override
    public void onClick(final DialogInterface dialogInterface, final int item) {

        processAccountSelected(accounts[item]);
    }

    @Override
    public void onCreate(final Bundle bundle) {
        super.onCreate(bundle);

        setContentView(R.layout.activitymain);

        accountManager = AccountManager.get(this);
        accounts = accountManager.getAccountsByType("com.google");

        if (accounts == null || accounts.length == 0) {
            // TODO
        } else if (accounts.length == 1) {
            processAccountSelected(accounts[0]);
        } else if (accounts.length > 1) {
            showDialog(MyConstants.DIALOG_ACCOUNTCHOSER);
        }
    }

    @Override
    protected Dialog onCreateDialog(final int id) {
        switch (id) {
            case MyConstants.DIALOG_ACCOUNTCHOSER:
                AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);

                String[] names = new String[accounts.length];

                for (int i = 0; i < accounts.length; i++) {
                    names[i] = accounts[i].name;
                }

                alertDialogBuilder.setItems(names, this);
                alertDialogBuilder.setTitle("Select a Google account");
                return alertDialogBuilder.create();
        }

        return null;
    }

    private void processAccountSelected(final Account account) {
        if (account != null) {
            authName = account.name.toString();
            if (!Tools.isEmpty(authName)) {
                Toast.makeText(this, authName, Toast.LENGTH_LONG).show();

                accountManager.getAuthToken(account, AUTH_TOKEN_TYPE, null, this,
                        new AccountManagerCallback<Bundle>() {

                            public void run(final AccountManagerFuture<Bundle> future) {
                                try {
                                    authToken = future.getResult().getString(
                                            AccountManager.KEY_AUTHTOKEN);
                                    processTokenReceived();
                                } catch (OperationCanceledException exception) {
                                    // TODO
                                } catch (Exception exception) {
                                    Log.d(this.getClass().getName(), exception.getMessage());
                                }
                            }
                        }, null);
            }
        }
    }

    private void processTokenReceived() {
        if (!Tools.isEmpty(authToken)) {
            HttpTransport transport = AndroidHttp.newCompatibleTransport();
            AccessProtectedResource accessProtectedResource = new GoogleAccessProtectedResource(
                    accessToken);
            Tasks service = new Tasks(transport, accessProtectedResource, new JacksonFactory());
            service.accessKey = CLIENT_ID;
            service.setApplicationName("Google-DriveSample/1.0");
        }
    }
}

Answer 1

The most recent example for using AccountManager in combination with a google-api-services library is the updated Tasks API example.GoogleAccountManager was e.g. just moved to another package.

If you are not using a build manager like Maven that resolves missing dependencies for you, you of course have to include the google-api-java-client libraries manually, which provide HttpTransport, etc.

For using AccountManager it is sufficient to use the Simple API Access key, that is provided in the API console. The part with a certificate fingerprint will only be relevant once Google Play Services will be available.