Android code snippet - OAuth verifier process (with Twitter4J)

OAuthVerify.java

public class OAuthVerify extends Activity {
    private static final String CONSUMER_KEY = "";
    private static final String CONSUMER_SECRET = "";
    private static final String CALLBACK_URL = "myoauthapp://oauthcallback/";
    private Context mContext;
    private WebView mWebView;
    private Twitter mTwitter;
    private RequestToken mRequestToken;
    private AccessToken mAccessToken;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().requestFeature(Window.FEATURE_PROGRESS);
        getWindow().requestFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.main);

        // Add here initialize mTwitter object with Twitter4J
        mTwitter = new TwitterFactory().getInstance();
        mTwitter.setOAuthConsumer(CONSUMER_KEY, CONSUMER_SECRET);
        mRequestToken = mTwitter.getOAuthRequestToken(CALLBACK_URL);

        mContext = getApplicationContext();
        mIntent = getIntent();
        mWebView = (WebView)findViewById(R.id.webview);
        mWebView.setWebViewClient(new WebViewClient(){
            @Override
            public boolean shouldOverrideUrlLoading (WebView view, String url) {
                if (url.startsWith(CALLBACK_URL)) {
                    Uri uri = Uri.parse(url);
                    completeVerify(uri);
                    return true;
                }
                return false;
            }
        });
        mWebView.getSettings().setAppCacheEnabled(false);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.clearCache(true);
        mWebView.clearFormData();
        getWindow().setFeatureInt(Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON);
        final Activity activity = this;
        mWebView.setWebChromeClient(new WebChromeClient() {
            public void onProgressChanged(WebView w, int p) {
                activity.setProgress(p * 100);
            }
        });

        // AsyncTask to load mRequestToken.getAuthorizationURL() into mWebView
        OAuthTask oauthTask = new OAuthTask();
        oauthTask.execute();
    }

    private void completeVerify(Uri uri) {
        if (uri != null) {
            String verifier = uri.getQueryParameter("oauth_verifier");
            try {
                mAccessToken = mTwitter.getOAuthAccessToken(mRequestToken, verifier);
                mTwitter.setOAuthAccessToken(mAccessToken);
                // Add code here to save the OAuth AccessToken and AccessTokenSecret into  SharedPreferences
            } catch (Exception e) {
                Log.d(LOG_TAG, "Cannot get AccessToken: " + e.getMessage());
            }
            setResult(Activity.RESULT_OK, mIntent);
            finish();
        }
    }
}