FlickrOAuthTask.java

/**
 * 
 */
package com.gmail.charleszq.picorner.task.flickr;

import java.net.URL;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;

import com.gmail.charleszq.picorner.PicornerApplication;
import com.gmail.charleszq.picorner.R;
import com.gmail.charleszq.picorner.utils.FlickrHelper;
import com.gmail.charleszq.picorner.utils.IConstants;
import com.googlecode.flickrjandroid.Flickr;
import com.googlecode.flickrjandroid.auth.Permission;
import com.googlecode.flickrjandroid.oauth.OAuthToken;

/**
 * Represents the task to start the oauth process.
 * 
 * @author charles
 * 
 */
public class FlickrOAuthTask extends AsyncTask<Void, Integer, String> {

	private final String TAG = FlickrOAuthTask.class.getSimpleName();

	private static final Uri OAUTH_CALLBACK_URI = Uri
			.parse(IConstants.ID_SCHEME + "://oauth"); //$NON-NLS-1$

	/**
	 * The context.
	 */
	private Context mContext;

	/**
	 * The progress dialog before going to the browser.
	 */
	private ProgressDialog mProgressDialog;

	/**
	 * Constructor.
	 * 
	 * @param context
	 */
	public FlickrOAuthTask(Context context) {
		super();
		this.mContext = context;
	}

	@Override
	protected void onPreExecute() {
		super.onPreExecute();
		mProgressDialog = ProgressDialog.show(mContext,
				"", mContext.getString(R.string.auth_gen_req_token)); //$NON-NLS-1$
		mProgressDialog.setCanceledOnTouchOutside(true);
		mProgressDialog.setCancelable(true);
		mProgressDialog.setOnCancelListener(new OnCancelListener() {
			@Override
			public void onCancel(DialogInterface dlg) {
				FlickrOAuthTask.this.cancel(true);
			}
		});
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see android.os.AsyncTask#doInBackground(Params[])
	 */
	@Override
	protected String doInBackground(Void... params) {
		try {
			Flickr f = FlickrHelper.getInstance().getFlickr();
			OAuthToken oauthToken = f.getOAuthInterface().getRequestToken(
					OAUTH_CALLBACK_URI.toString());
			saveTokenSecrent(oauthToken.getOauthTokenSecret());
			URL oauthUrl = f.getOAuthInterface().buildAuthenticationUrl(
					Permission.WRITE, oauthToken);
			return oauthUrl.toString();
		} catch (Exception e) {
			Log.e(TAG, "Error to oauth", e); //$NON-NLS-1$
			return "error:" + e.getMessage(); //$NON-NLS-1$
		}
	}

	/**
	 * Saves the oauth token secrent.
	 * 
	 * @param tokenSecret
	 */
	private void saveTokenSecrent(String tokenSecret) {

		Activity act = (Activity) mContext;
		PicornerApplication app = (PicornerApplication) act.getApplication();
		app.saveFlickrTokenSecret(tokenSecret);
	}

	@Override
	protected void onPostExecute(String result) {
		if (mProgressDialog != null) {
			try {
				mProgressDialog.cancel();
			} catch (Exception e) {

			}
		}
		if (result != null && !result.startsWith("error")) { //$NON-NLS-1$
			mContext.startActivity(new Intent(Intent.ACTION_VIEW, Uri
					.parse(result)));
		} else {
			Toast.makeText(mContext, result, Toast.LENGTH_LONG).show();
		}
	}

}