Android Open Source - EBrowser Custom Web View

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License

The source code is released under:
GNU General Public License
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Java Source Code

/*
 * Zirco Browser for Android// ww  w .j a va 2s .  c  o m
 * 
 * Copyright (C) 2010 J. Devauchelle and contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 3 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

package org.zirco.ui.components;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.zirco.controllers.Controller;
import org.zirco.utils.ApplicationUtils;
import org.zirco.utils.Constants;
import org.zirco.utils.ProxySettings;

import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.webkit.CookieManager;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebSettings.PluginState;
import android.webkit.WebSettings.ZoomDensity;

/**
 * A convenient extension of WebView.
 */
public class CustomWebView extends WebView {
  
  private Context mContext;
  
  private int mProgress = 100;
  
  private boolean mIsLoading = false;
  
  private String mLoadedUrl;
  
  private static boolean mBoMethodsLoaded = false;
  
  private static Method mOnPauseMethod = null;
  private static Method mOnResumeMethod = null;
  private static Method mSetFindIsUp = null;
  private static Method mNotifyFindDialogDismissed = null;
  
  /**
   * Constructor.
   * @param context The current context.
   */
  public CustomWebView(Context context) {
    super(context);
    
    mContext = context;
    
    initializeOptions();
    loadMethods();
  }
  
  /**
   * Constructor.
   * @param context The current context.
   * @param attrs The attribute set.
   */
  public CustomWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
        
        mContext = context;
        
        initializeOptions();
        loadMethods();
  }  
  
  /**
   * Initialize the WebView with the options set by the user through preferences.
   */
  public void initializeOptions() {
    WebSettings settings = getSettings();
    
    // User settings    
    settings.setJavaScriptEnabled(Controller.getInstance().getPreferences().getBoolean(Constants.PREFERENCES_BROWSER_ENABLE_JAVASCRIPT, true));
    settings.setLoadsImagesAutomatically(Controller.getInstance().getPreferences().getBoolean(Constants.PREFERENCES_BROWSER_ENABLE_IMAGES, true));
    settings.setUseWideViewPort(Controller.getInstance().getPreferences().getBoolean(Constants.PREFERENCES_BROWSER_USE_WIDE_VIEWPORT, true));
    settings.setLoadWithOverviewMode(Controller.getInstance().getPreferences().getBoolean(Constants.PREFERENCES_BROWSER_LOAD_WITH_OVERVIEW, false));
    settings.setSaveFormData(Controller.getInstance().getPreferences().getBoolean(Constants.PREFERENCES_BROWSER_ENABLE_FORM_DATA, true));
    settings.setSavePassword(Controller.getInstance().getPreferences().getBoolean(Constants.PREFERENCES_BROWSER_ENABLE_PASSWORDS, true));
    settings.setDefaultZoom(ZoomDensity.valueOf(Controller.getInstance().getPreferences().getString(Constants.PREFERENCES_DEFAULT_ZOOM_LEVEL, ZoomDensity.MEDIUM.toString())));    
    settings.setUserAgentString(Controller.getInstance().getPreferences().getString(Constants.PREFERENCES_BROWSER_USER_AGENT, Constants.USER_AGENT_DEFAULT));
    
    CookieManager.getInstance().setAcceptCookie(Controller.getInstance().getPreferences().getBoolean(Constants.PREFERENCES_BROWSER_ENABLE_COOKIES, true));
    
    if (Build.VERSION.SDK_INT <= 7) {
      settings.setPluginsEnabled(Controller.getInstance().getPreferences().getBoolean(Constants.PREFERENCES_BROWSER_ENABLE_PLUGINS_ECLAIR, true));
    } else {
      settings.setPluginState(PluginState.valueOf(Controller.getInstance().getPreferences().getString(Constants.PREFERENCES_BROWSER_ENABLE_PLUGINS, PluginState.ON_DEMAND.toString())));
    }
    
    settings.setSupportZoom(true);
    
    if (Controller.getInstance().getPreferences().getBoolean(Constants.PREFERENCES_BROWSER_ENABLE_PROXY_SETTINGS, false)) {
        ProxySettings.setSystemProxy(mContext);
    } else {
      ProxySettings.resetSystemProxy(mContext);
    }
        
    // Technical settings
    settings.setSupportMultipleWindows(true);            
      setLongClickable(true);
      setScrollbarFadingEnabled(true);
      setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);      
      setDrawingCacheEnabled(true);
      
      settings.setAppCacheEnabled(true);
      settings.setDatabaseEnabled(true);
      settings.setDomStorageEnabled(true);
  }
  
  @Override
  public boolean onTouchEvent(MotionEvent ev) {
    
    final int action = ev.getAction();
    
    // Enable / disable zoom support in case of multiple pointer, e.g. enable zoom when we have two down pointers, disable with one pointer or when pointer up.
    // We do this to prevent the display of zoom controls, which are not useful and override over the right bubble.
    if ((action == MotionEvent.ACTION_DOWN) ||
        (action == MotionEvent.ACTION_POINTER_DOWN) ||
        (action == MotionEvent.ACTION_POINTER_1_DOWN) ||
        (action == MotionEvent.ACTION_POINTER_2_DOWN) ||
        (action == MotionEvent.ACTION_POINTER_3_DOWN)) {
      if (ev.getPointerCount() > 1) {
        this.getSettings().setBuiltInZoomControls(true);
        this.getSettings().setSupportZoom(true);        
      } else {
        this.getSettings().setBuiltInZoomControls(false);
        this.getSettings().setSupportZoom(false);
      }
    } else if ((action == MotionEvent.ACTION_UP) ||
        (action == MotionEvent.ACTION_POINTER_UP) ||
        (action == MotionEvent.ACTION_POINTER_1_UP) ||
        (action == MotionEvent.ACTION_POINTER_2_UP) ||
        (action == MotionEvent.ACTION_POINTER_3_UP)) {
      this.getSettings().setBuiltInZoomControls(false);
      this.getSettings().setSupportZoom(false);      
    }
    
    return super.onTouchEvent(ev);
  }
  
  @Override
  public void loadUrl(String url) {
    mLoadedUrl = url;
    super.loadUrl(url);
  }

  /**
   * Inject the AdSweep javascript.
   */
  public void loadAdSweep() {
    super.loadUrl(ApplicationUtils.getAdSweepString(mContext));
  }
  
  /**
   * Set the current loading progress of this view.
   * @param progress The current loading progress.
   */
  public void setProgress(int progress) {
    mProgress = progress;
  }
  
  /**
   * Get the current loading progress of the view.
   * @return The current loading progress of the view.
   */
  public int getProgress() {
    return mProgress;
  }
  
  /**
   * Triggered when a new page loading is requested.
   */
  public void notifyPageStarted() {
    mIsLoading = true;
  }
  
  /**
   * Triggered when the page has finished loading.
   */
  public void notifyPageFinished() {
    mProgress = 100;
    mIsLoading = false;
  }
  
  /**
   * Check if the view is currently loading.
   * @return True if the view is currently loading.
   */
  public boolean isLoading() {
    return mIsLoading;
  }
  
  /**
   * Get the loaded url, e.g. the one asked by the user, without redirections.
   * @return The loaded url.
   */
  public String getLoadedUrl() {
    return mLoadedUrl;
  }
  
  /**
   * Reset the loaded url.
   */
  public void resetLoadedUrl() {
    mLoadedUrl = null;
  }
  
  public boolean isSameUrl(String url) {
    if (url != null) {
      return url.equalsIgnoreCase(this.getUrl());
    }
    
    return false;
  }
  
  /**
   * Perform an 'onPause' on this WebView through reflexion.
   */
  public void doOnPause() {
    if (mOnPauseMethod != null) {
      try {
        
        mOnPauseMethod.invoke(this);
        
      } catch (IllegalArgumentException e) {
        Log.e("CustomWebView", "doOnPause(): " + e.getMessage());
      } catch (IllegalAccessException e) {
        Log.e("CustomWebView", "doOnPause(): " + e.getMessage());
      } catch (InvocationTargetException e) {
        Log.e("CustomWebView", "doOnPause(): " + e.getMessage());
      }
    }
  }
  
  /**
   * Perform an 'onResume' on this WebView through reflexion.
   */
  public void doOnResume() {
    if (mOnResumeMethod != null) {
      try {
        
        mOnResumeMethod.invoke(this);
        
      } catch (IllegalArgumentException e) {
        Log.e("CustomWebView", "doOnResume(): " + e.getMessage());
      } catch (IllegalAccessException e) {
        Log.e("CustomWebView", "doOnResume(): " + e.getMessage());
      } catch (InvocationTargetException e) {
        Log.e("CustomWebView", "doOnResume(): " + e.getMessage());
      }
    }
  }
  
  public void doSetFindIsUp(boolean value) {
    if (mSetFindIsUp != null) {
      try {
        
        mSetFindIsUp.invoke(this, value);
        
      } catch (IllegalArgumentException e) {
        Log.e("CustomWebView", "doSetFindIsUp(): " + e.getMessage());
      } catch (IllegalAccessException e) {
        Log.e("CustomWebView", "doSetFindIsUp(): " + e.getMessage());
      } catch (InvocationTargetException e) {
        Log.e("CustomWebView", "doSetFindIsUp(): " + e.getMessage());
      }
    }
  }
  
  public void doNotifyFindDialogDismissed() {
    if (mNotifyFindDialogDismissed != null) {
      try {
        
        mNotifyFindDialogDismissed.invoke(this);
        
      } catch (IllegalArgumentException e) {
        Log.e("CustomWebView", "doNotifyFindDialogDismissed(): " + e.getMessage());
      } catch (IllegalAccessException e) {
        Log.e("CustomWebView", "doNotifyFindDialogDismissed(): " + e.getMessage());
      } catch (InvocationTargetException e) {
        Log.e("CustomWebView", "doNotifyFindDialogDismissed(): " + e.getMessage());
      }
    }
  }
  
  /**
   * Load static reflected methods.
   */
  private void loadMethods() {
    
    if (!mBoMethodsLoaded) {
    
      try {

        mOnPauseMethod = WebView.class.getMethod("onPause");
        mOnResumeMethod = WebView.class.getMethod("onResume");
        

      } catch (SecurityException e) {
        Log.e("CustomWebView", "loadMethods(): " + e.getMessage());
        mOnPauseMethod = null;
        mOnResumeMethod = null;
      } catch (NoSuchMethodException e) {
        Log.e("CustomWebView", "loadMethods(): " + e.getMessage());
        mOnPauseMethod = null;
        mOnResumeMethod = null;
      }
      
      try {
        
        mSetFindIsUp = WebView.class.getMethod("setFindIsUp", Boolean.TYPE);
        mNotifyFindDialogDismissed = WebView.class.getMethod("notifyFindDialogDismissed");
        
      } catch (SecurityException e) {
        Log.e("CustomWebView", "loadMethods(): " + e.getMessage());
        mSetFindIsUp = null;
        mNotifyFindDialogDismissed = null;
      } catch (NoSuchMethodException e) {
        Log.e("CustomWebView", "loadMethods(): " + e.getMessage());
        mSetFindIsUp = null;
        mNotifyFindDialogDismissed = null;
      }

      mBoMethodsLoaded = true;
    }
  }

}
Java Source Code List
