Facebook WebView: Displaying web pages

/* * Copyright 2010 Facebook, Inc. * * 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.facebook.android; import android.app.Dialog; import android.app.ProgressDialog; import android.content.Context; import android.content.Intent; 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.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.facebook.android.Facebook.DialogListener; public class FbDialog extends Dialog { static final int FB_BLUE = 0xFF6D84B4; static final float[] DIMENSIONS_LANDSCAPE = {460, 260}; static final float[] DIMENSIONS_PORTRAIT = {280, 420}; 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; static final String DISPLAY_STRING = "touch"; static final String FB_ICON = "icon.png"; private final String mUrl; private final DialogListener mListener; private ProgressDialog mSpinner; private WebView mWebView; private LinearLayout mContent; private TextView mTitle; public FbDialog(Context context, String url, DialogListener listener) { super(context); mUrl = url; 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; float[] dimensions = (display.getWidth() < display.getHeight()) ? DIMENSIONS_PORTRAIT : DIMENSIONS_LANDSCAPE; addContentView(mContent, new FrameLayout.LayoutParams((int) (dimensions[0] * scale + 0.5f), (int) (dimensions[1] * scale + 0.5f))); } private void setUpTitle() { requestWindowFeature(Window.FEATURE_NO_TITLE); Drawable icon = getContext().getResources().getDrawable(R.drawable.facebook_icon); mTitle = new TextView(getContext()); mTitle.setText("Facebook"); mTitle.setTextColor(Color.WHITE); mTitle.setTypeface(Typeface.DEFAULT_BOLD); mTitle.setBackgroundColor(FB_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 FbDialog.FbWebViewClient()); mWebView.getSettings().setJavaScriptEnabled(true); mWebView.loadUrl(mUrl); mWebView.setLayoutParams(FILL); mContent.addView(mWebView); } private class FbWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { Log.d("Facebook-WebView", "Redirect URL: " + url); if (url.startsWith(Facebook.REDIRECT_URI)) { Bundle values = Util.parseUrl(url); String error = values.getString("error"); if (error == null) { error = values.getString("error_type"); } if (error == null) { mListener.onComplete(values); } else if (error.equals("access_denied") || error.equals("OAuthAccessDeniedException")) { mListener.onCancel(); } else { mListener.onFacebookError(new FacebookError(error)); } FbDialog.this.dismiss(); return true; } else if (url.startsWith(Facebook.CANCEL_URI)) { mListener.onCancel(); FbDialog.this.dismiss(); return true; } else if (url.contains(DISPLAY_STRING)) { return false; } // launch non-dialog URLs in a full browser getContext().startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url))); return true; } @Override public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { super.onReceivedError(view, errorCode, description, failingUrl); mListener.onError(new DialogError(description, errorCode, failingUrl)); FbDialog.this.dismiss(); } @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { Log.d("Facebook-WebView", "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(); } } }