Java tutorial
/* * Copyright 2010 Facebook, Inc. * * Code was changed by Efi MK. * Visit my blog: http://couchpotatoapps.wordpress.com/ * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.twitter.android; import twitter4j.Twitter; import twitter4j.TwitterFactory; import twitter4j.auth.RequestToken; import android.app.Dialog; import android.app.ProgressDialog; import android.content.Context; import android.content.SharedPreferences; import android.content.res.Configuration; import android.graphics.Bitmap; import android.graphics.Color; import android.graphics.Typeface; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.Bundle; import android.preference.PreferenceManager; import android.util.Log; import android.view.Display; import android.view.ViewGroup; import android.view.Window; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.TextView; import com.twitter.android.OAuthRequestTokenTask.TaskListener; /** * A dialog box for twitter authentication. * @author Efi MK (Visit my <a href="http://couchpotatoapps.wordpress.com">blog</a>) * */ public class TwitterAuthDialog extends Dialog implements TaskListener { static final int TWITTER_BLUE = 0xFF6D84B4; static final float[] DIMENSIONS_DIFF_LANDSCAPE = { 20, 60 }; static final float[] DIMENSIONS_DIFF_PORTRAIT = { 40, 60 }; static final FrameLayout.LayoutParams FILL = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT); static final int MARGIN = 4; static final int PADDING = 2; /** * Update listener for various events. */ private TwitterDialogListener mListener; /** * Display a spinner while waiting for the site to load. */ private ProgressDialog mSpinner; /** * Display twitter's logon screen. */ private WebView mWebView; private LinearLayout mContent; private TextView mTitle; /** * Used for logger. */ final String TAG = getClass().getName(); /** * Listen to this schema and act upon. */ private static String CALLBACK_SCHEME = "x-latify-oauth-twitter"; /** * A callback URL used to capture a successful authentication. */ public static String CALLBACK_URL = CALLBACK_SCHEME + "://callback"; /** * A twitter agent. */ private Twitter mTwitter; /** * */ private RequestToken mRequestToken; /** * Create a new dialog box. * @param context - Context to use. * @param consumerKey - Required by OAuth. Register you app in twitter to get this value. * @param consumerSecret - Required by OAuth. Register you app in twitter to get this value. * @param listener - Listen to various events. */ public TwitterAuthDialog(Context context, String consumerKey, String consumerSecret, TwitterDialogListener listener) { super(context); mTwitter = new TwitterFactory().getInstance(); mTwitter.setOAuthConsumer(consumerKey, consumerSecret); mListener = listener; } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mSpinner = new ProgressDialog(getContext()); mSpinner.requestWindowFeature(Window.FEATURE_NO_TITLE); mSpinner.setMessage("Loading..."); mContent = new LinearLayout(getContext()); mContent.setOrientation(LinearLayout.VERTICAL); setUpTitle(); setUpWebView(); Display display = getWindow().getWindowManager().getDefaultDisplay(); final float scale = getContext().getResources().getDisplayMetrics().density; int orientation = getContext().getResources().getConfiguration().orientation; float[] dimensions = (orientation == Configuration.ORIENTATION_LANDSCAPE) ? DIMENSIONS_DIFF_LANDSCAPE : DIMENSIONS_DIFF_PORTRAIT; addContentView(mContent, new LinearLayout.LayoutParams(display.getWidth() - ((int) (dimensions[0] * scale + 0.5f)), display.getHeight() - ((int) (dimensions[1] * scale + 0.5f)))); new OAuthRequestTokenTask(mTwitter, mWebView, this).execute(); } private void setUpTitle() { requestWindowFeature(Window.FEATURE_NO_TITLE); Drawable icon = getContext().getResources().getDrawable(R.drawable.twitter_small); mTitle = new TextView(getContext()); mTitle.setText("Twitter"); mTitle.setTextColor(Color.WHITE); mTitle.setTypeface(Typeface.DEFAULT_BOLD); mTitle.setBackgroundColor(TWITTER_BLUE); mTitle.setPadding(MARGIN + PADDING, MARGIN, MARGIN, MARGIN); mTitle.setCompoundDrawablePadding(MARGIN + PADDING); mTitle.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null); mContent.addView(mTitle); } private void setUpWebView() { mWebView = new WebView(getContext()); mWebView.setVerticalScrollBarEnabled(false); mWebView.setHorizontalScrollBarEnabled(false); mWebView.setWebViewClient(new TwitterAuthDialog.TwitterWebViewClient()); mWebView.getSettings().setJavaScriptEnabled(true); mWebView.setLayoutParams(FILL); mContent.addView(mWebView); } private class TwitterWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { Log.d(TAG, "Redirect URL: " + url); // It's our callback URL ! Uri uri = Uri.parse(url); // Just make sure it's not denied URI. if (uri.getScheme().equals(CALLBACK_SCHEME) && !uri.toString().contains("denied")) { // Dismiss the dialog dismiss(); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext()); new RetrieveAccessTokenTask(mTwitter, mRequestToken, prefs, TwitterAuthDialog.this).execute(uri); mListener.onComplete(uri); } // Anything else means the user cancelled. else { mListener.onCancel(); dismiss(); } return true; } @Override public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { super.onReceivedError(view, errorCode, description, failingUrl); mListener.onError(new TwitterDialogError(description, errorCode, failingUrl)); TwitterAuthDialog.this.dismiss(); } @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { Log.d(TAG, "Webview loading URL: " + url); super.onPageStarted(view, url, favicon); mSpinner.show(); } @Override public void onPageFinished(WebView view, String url) { super.onPageFinished(view, url); String title = mWebView.getTitle(); if (title != null && title.length() > 0) { mTitle.setText(title); } mSpinner.dismiss(); } } @Override public void onPostExecute(Exception e, Object result) { // If result is of type request token then save it for later use. if (result instanceof RequestToken) { mRequestToken = (RequestToken) result; } // In case exception is thrown then close the twitter dialogbox. if (e != null) { dismiss(); mListener.onError(new TwitterDialogError(e.getMessage())); } } }