Advanced Use with OAuthLoginFragment

If you need to authenticate multiple different services from within a single Activity, then the simple OAuthLoginActivity approach probably won't work since each Activity is locked to a single client.

For more advanced usage such as this case, consider using the OAuthLoginFragment and embedding them into a regular FragmentActivity as outlined below. This approach is perfect anytime you don't want the Activity tied just a single type of client.

Create a new OAuthLoginFragment

Assuming you have a configured REST client as explained in the README, next define a fragment for each specific client:

public class TwitterLoginFragment extends OAuthLoginFragment<TwitterClient> {
    Button btnLoginTwitter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_twitter_login, container);
    }

    @Override
    public void onActivityCreated(Bundle saved) {
        super.onActivityCreated(saved);
	btnLoginTwitter = (Button) getActivity.findViewById(R.id.btnLoginTwitter);
        btnLoginTwitter.setOnClickListener(new ServiceButtonOnClickListener());
     }

     @Override
     public void onLoginSuccess() {
         // fires when twitter is authenticated, launch an intent as an example
         Intent i = new Intent(this, TimelineActivity.class);
         i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
         startActivity(i);
     }
	
     @Override
     public void onLoginFailure(Exception e) {
        // fires if twitter authentication fails
        e.printStackTrace();
     }

     private class ServiceButtonOnClickListener implements OnClickListener {
         @Override
	 public void onClick(View v) {
	     if (!getClient().isAuthenticated()) {
		  getClient().connect();
	     } else {
                 // ...client is already authenticated...
             }
         }
    }
}

Fragment XML in this case should just have a button that can be clicked to initiate the authentication process.

Embed the Fragment in a FragmentActivity

Now you can embed any number of these fragments in a LoginActivity that extends from FragmentActivity:

public class LoginActivity extends FragmentActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_login);
    }
}

The LoginActivity might have XML looking like this:

<fragment
   android:id="@+id/fragment_twitter_login"
   android:name="com.codepath.apps.multiservicerestclient.fragments.TwitterLoginFragment"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   tools:layout="@layout/fragment_twitter_login" />

Using the REST Client

Using the client is similar to the README but you can get access to the shared client instance using the OAuthBaseClient getInstance method:

// Can be used in any activity to access authenticated client
public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TwitterClient clientTwitter = 
            (TwitterClient) TwitterClient.getInstance(TwitterClient.class, this);
    }
}