Twitter4jとAndroidAnnotationsによるTwitter認証ダイアログの実装

How to use.java

TwitterAuthDialogFragment dialog = TwitterAuthDialogFragment_.builder()
		.consumerKey("xxxxx")
		.consumerSecret("yyyyy")
		.callbackUrl("http://xxxxx/yyyy")
		.build();
dialog.setCallbacks(new TwitterAuthDialogFragment.Callbacks() {
	@Override
	public void onAccessTokenAvailable(String accessToken, String accessTokenSecret) {
		// save accessToken & accessTokenSecret or do something
	}
});
dialog.show(getFragmentManager(), null);

TwitterAuthDialogFragment.java

import org.androidannotations.annotations.Background;
import org.androidannotations.annotations.EFragment;
import org.androidannotations.annotations.FragmentArg;
import org.androidannotations.annotations.UiThread;

import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.auth.AccessToken;
import twitter4j.auth.RequestToken;
import twitter4j.conf.ConfigurationBuilder;
import android.app.AlertDialog;
import android.app.Dialog;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.webkit.WebView;
import android.webkit.WebViewClient;

@EFragment
public class TwitterAuthDialogFragment extends DialogFragment {
	public static interface Callbacks {
		void onAccessTokenAvailable(String accessToken, String accessTokenSecret);
	}

	private WebView view;
	private RequestToken requestToken;
	private Callbacks callbacks;

	@FragmentArg
	String consumerKey;
	@FragmentArg
	String consumerSecret;
	@FragmentArg
	String callbackUrl;

	@Override
	public Dialog onCreateDialog(Bundle savedInstanceState) {
		view = new WebView(getActivity()) {
			@Override
			public boolean onCheckIsTextEditor() {
				return true;
			}
		};
		view.setWebViewClient(new WebViewClient() {
			@Override
			public boolean shouldOverrideUrlLoading(WebView view, String url) {
				if (url.contains(callbackUrl)) {
					Uri uri = Uri.parse(url);
					String verifier = uri.getQueryParameter("oauth_verifier");
					if (verifier != null) {
						getAccessToken(verifier);
					}
					return true;
				}
				return false;
			}
		});
		return new AlertDialog.Builder(getActivity())
				.setView(view)
				.create();
	}

	@Override
	public void onStart() {
		super.onStart();
		init();
	}

	@Background
	void init() {
		try {
			Twitter twitter = TwitterFactory.getSingleton();

			if (consumerKey != null && consumerSecret != null) {
				twitter.setOAuthConsumer(consumerKey, consumerSecret);
			}

			requestToken = twitter.getOAuthRequestToken();
			String authUrl = requestToken.getAuthorizationURL();
			loadUrl(authUrl);
		} catch (TwitterException e) {
			e.printStackTrace();
			dismiss();
		}
	}

	@Background
	void getAccessToken(String verifier) {
		try {
			AccessToken accessToken = new TwitterFactory(new ConfigurationBuilder().build()).getInstance().getOAuthAccessToken(requestToken, verifier);
			callback(accessToken.getToken(), accessToken.getTokenSecret());
			dismiss();
		} catch (TwitterException e) {
			e.printStackTrace();
		}
	}

	@UiThread
	void callback(String token, String tokenSecret) {
		if (callbacks != null) {
			callbacks.onAccessTokenAvailable(token, tokenSecret);
		}
	}

	@UiThread
	void loadUrl(String url) {
		view.loadUrl(url);
	}

	@Override
	@UiThread
	public void dismiss() {
		super.dismiss();
	}

	public void setCallbacks(Callbacks callbacks) {
		this.callbacks = callbacks;
	}
}