FbDialog.java :  » UnTagged » newbie4 » com » facebook » android » Android Open Source

/*
 * 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 String mUrl;
  private 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.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();
    }

  }
}