packages/CaptivePortalLogin/src/com/android/captiveportallogin/CaptivePortalLoginActivity.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * 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.android.captiveportallogin;

 import android.app.Activity;
 import android.app.LoadedApk;
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.net.CaptivePortal;
 import android.net.ConnectivityManager;
 import android.net.ConnectivityManager.NetworkCallback;
 import android.net.Network;
 import android.net.NetworkCapabilities;
 import android.net.NetworkRequest;
 import android.net.Proxy;
 import android.net.Uri;
 import android.net.http.SslError;
 import android.os.Bundle;
 import android.provider.Settings;
 import android.util.ArrayMap;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.webkit.SslErrorHandler;
 import android.webkit.WebChromeClient;
 import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 import android.widget.ProgressBar;
 import android.widget.TextView;

 import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.lang.InterruptedException;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.util.Random;

 public class CaptivePortalLoginActivity extends Activity {
     private static final String TAG = "CaptivePortalLogin";
     private static final String DEFAULT_SERVER = "connectivitycheck.gstatic.com";
     private static final int SOCKET_TIMEOUT_MS = 10000;

     private enum Result { DISMISSED, UNWANTED, WANTED_AS_IS };

     private URL mURL;
     private Network mNetwork;
     private CaptivePortal mCaptivePortal;
     private NetworkCallback mNetworkCallback;
     private ConnectivityManager mCm;
     private boolean mLaunchBrowser = false;
     private MyWebViewClient mWebViewClient;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         String server = Settings.Global.getString(getContentResolver(), "captive_portal_server");
         if (server == null) server = DEFAULT_SERVER;
         mCm = ConnectivityManager.from(this);
         String url = getIntent().getStringExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL_URL);
         try {
             mURL = url != null ? new URL(url) : new URL("http", server, "/generate_204");
         } catch (MalformedURLException e) {
             // System misconfigured, bail out in a way that at least provides network access.
             Log.e(TAG, "Invalid captive portal URL, server=" + server);
             done(Result.WANTED_AS_IS);
         }
         mNetwork = getIntent().getParcelableExtra(ConnectivityManager.EXTRA_NETWORK);
         mCaptivePortal = getIntent().getParcelableExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL);

         // Also initializes proxy system properties.
         mCm.bindProcessToNetwork(mNetwork);

         // Proxy system properties must be initialized before setContentView is called because
         // setContentView initializes the WebView logic which in turn reads the system properties.
         setContentView(R.layout.activity_captive_portal_login);

         getActionBar().setDisplayShowHomeEnabled(false);

         // Exit app if Network disappears.
         final NetworkCapabilities networkCapabilities = mCm.getNetworkCapabilities(mNetwork);
         if (networkCapabilities == null) {
             finish();
             return;
         }
         mNetworkCallback = new NetworkCallback() {
             @Override
             public void onLost(Network lostNetwork) {
                 if (mNetwork.equals(lostNetwork)) done(Result.UNWANTED);
             }
         };
         final NetworkRequest.Builder builder = new NetworkRequest.Builder();
         for (int transportType : networkCapabilities.getTransportTypes()) {
             builder.addTransportType(transportType);
         }
         mCm.registerNetworkCallback(builder.build(), mNetworkCallback);

         final WebView myWebView = (WebView) findViewById(R.id.webview);
         myWebView.clearCache(true);
         WebSettings webSettings = myWebView.getSettings();
         webSettings.setJavaScriptEnabled(true);
         mWebViewClient = new MyWebViewClient();
         myWebView.setWebViewClient(mWebViewClient);
         myWebView.setWebChromeClient(new MyWebChromeClient());
         // Start initial page load so WebView finishes loading proxy settings.
         // Actual load of mUrl is initiated by MyWebViewClient.
         myWebView.loadData("", "text/html", null);
     }

     // Find WebView's proxy BroadcastReceiver and prompt it to read proxy system properties.
     private void setWebViewProxy() {
         LoadedApk loadedApk = getApplication().mLoadedApk;
         try {
             Field receiversField = LoadedApk.class.getDeclaredField("mReceivers");
             receiversField.setAccessible(true);
             ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk);
             for (Object receiverMap : receivers.values()) {
                 for (Object rec : ((ArrayMap) receiverMap).keySet()) {
                     Class clazz = rec.getClass();
                     if (clazz.getName().contains("ProxyChangeListener")) {
                         Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class,
                                 Intent.class);
                         Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION);
                         onReceiveMethod.invoke(rec, getApplicationContext(), intent);
                         Log.v(TAG, "Prompting WebView proxy reload.");
                     }
                 }
             }
         } catch (Exception e) {
             Log.e(TAG, "Exception while setting WebView proxy: " + e);
         }
     }

     private void done(Result result) {
         if (mNetworkCallback != null) {
             mCm.unregisterNetworkCallback(mNetworkCallback);
             mNetworkCallback = null;
         }
         switch (result) {
             case DISMISSED:
                 mCaptivePortal.reportCaptivePortalDismissed();
                 break;
             case UNWANTED:
                 mCaptivePortal.ignoreNetwork();
                 break;
             case WANTED_AS_IS:
                 mCaptivePortal.useNetwork();
                 break;
         }
         finish();
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.captive_portal_login, menu);
         return true;
     }

     @Override
     public void onBackPressed() {
         WebView myWebView = (WebView) findViewById(R.id.webview);
         if (myWebView.canGoBack() && mWebViewClient.allowBack()) {
             myWebView.goBack();
         } else {
             super.onBackPressed();
         }
     }

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         int id = item.getItemId();
         if (id == R.id.action_use_network) {
             done(Result.WANTED_AS_IS);
             return true;
         }
         if (id == R.id.action_do_not_use_network) {
             done(Result.UNWANTED);
             return true;
         }
         return super.onOptionsItemSelected(item);
     }

     @Override
     public void onDestroy() {
         super.onDestroy();

         if (mNetworkCallback != null) {
             mCm.unregisterNetworkCallback(mNetworkCallback);
             mNetworkCallback = null;
         }
         if (mLaunchBrowser) {
             // Give time for this network to become default. After 500ms just proceed.
             for (int i = 0; i < 5; i++) {
                 // TODO: This misses when mNetwork underlies a VPN.
                 if (mNetwork.equals(mCm.getActiveNetwork())) break;
                 try {
                     Thread.sleep(100);
                 } catch (InterruptedException e) {
                 }
             }
             startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(mURL.toString())));
         }
     }

     private void testForCaptivePortal() {
         new Thread(new Runnable() {
             public void run() {
                 // Give time for captive portal to open.
                 try {
                     Thread.sleep(1000);
                 } catch (InterruptedException e) {
                 }
                 HttpURLConnection urlConnection = null;
                 int httpResponseCode = 500;
                 try {
                     urlConnection = (HttpURLConnection) mURL.openConnection();
                     urlConnection.setInstanceFollowRedirects(false);
                     urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS);
                     urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS);
                     urlConnection.setUseCaches(false);
                     urlConnection.getInputStream();
                     httpResponseCode = urlConnection.getResponseCode();
                 } catch (IOException e) {
                 } finally {
                     if (urlConnection != null) urlConnection.disconnect();
                 }
                 if (httpResponseCode == 204) {
                     done(Result.DISMISSED);
                 }
             }
         }).start();
     }

     private class MyWebViewClient extends WebViewClient {
         private static final String INTERNAL_ASSETS = "file:///android_asset/";
         private final String mBrowserBailOutToken = Long.toString(new Random().nextLong());
         // How many Android device-independent-pixels per scaled-pixel
         // dp/sp = (px/sp) / (px/dp) = (1/sp) / (1/dp)
         private final float mDpPerSp = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 1,
                     getResources().getDisplayMetrics()) /
                     TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1,
                     getResources().getDisplayMetrics());
         private int mPagesLoaded;

         // If we haven't finished cleaning up the history, don't allow going back.
         public boolean allowBack() {
             return mPagesLoaded > 1;
         }

         @Override
         public void onPageStarted(WebView view, String url, Bitmap favicon) {
             if (url.contains(mBrowserBailOutToken)) {
                 mLaunchBrowser = true;
                 done(Result.WANTED_AS_IS);
                 return;
             }
             // The first page load is used only to cause the WebView to
             // fetch the proxy settings.  Don't update the URL bar, and
             // don't check if the captive portal is still there.
             if (mPagesLoaded == 0) return;
             // For internally generated pages, leave URL bar listing prior URL as this is the URL
             // the page refers to.
             if (!url.startsWith(INTERNAL_ASSETS)) {
                 final TextView myUrlBar = (TextView) findViewById(R.id.url_bar);
                 myUrlBar.setText(url);
             }
             testForCaptivePortal();
         }

         @Override
         public void onPageFinished(WebView view, String url) {
             mPagesLoaded++;
             if (mPagesLoaded == 1) {
                 // Now that WebView has loaded at least one page we know it has read in the proxy
                 // settings.  Now prompt the WebView read the Network-specific proxy settings.
                 setWebViewProxy();
                 // Load the real page.
                 view.loadUrl(mURL.toString());
                 return;
             } else if (mPagesLoaded == 2) {
                 // Prevent going back to empty first page.
                 view.clearHistory();
             }
             testForCaptivePortal();
         }

         // Convert Android device-independent-pixels (dp) to HTML size.
         private String dp(int dp) {
             // HTML px's are scaled just like dp's, so just add "px" suffix.
             return Integer.toString(dp) + "px";
         }

         // Convert Android scaled-pixels (sp) to HTML size.
         private String sp(int sp) {
             // Convert sp to dp's.
             float dp = sp * mDpPerSp;
             // Apply a scale factor to make things look right.
             dp *= 1.3;
             // Convert dp's to HTML size.
             return dp((int)dp);
         }

         // A web page consisting of a large broken lock icon to indicate SSL failure.
         private final String SSL_ERROR_HTML = "<html><head><style>" +
                 "body { margin-left:" + dp(48) + "; margin-right:" + dp(48) + "; " +
                         "margin-top:" + dp(96) + "; background-color:#fafafa; }" +
                 "img { width:" + dp(48) + "; height:" + dp(48) + "; }" +
                 "div.warn { font-size:" + sp(16) + "; margin-top:" + dp(16) + "; " +
                 "           opacity:0.87; line-height:1.28; }" +
                 "div.example { font-size:" + sp(14) + "; margin-top:" + dp(16) + "; " +
                 "              opacity:0.54; line-height:1.21905; }" +
                 "a { font-size:" + sp(14) + "; text-decoration:none; text-transform:uppercase; " +
                 "    margin-top:" + dp(24) + "; display:inline-block; color:#4285F4; " +
                 "    height:" + dp(48) + "; font-weight:bold; }" +
                 "</style></head><body><p><img src=quantum_ic_warning_amber_96.png><br>" +
                 "<div class=warn>%s</div>" +
                 "<div class=example>%s</div>" +
                 "<a href=%s>%s</a></body></html>";

         @Override
         public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
             Log.w(TAG, "SSL error (error: " + error.getPrimaryError() + " host: " +
                     // Only show host to avoid leaking private info.
                     Uri.parse(error.getUrl()).getHost() + " certificate: " +
                     error.getCertificate() + "); displaying SSL warning.");
             final String html = String.format(SSL_ERROR_HTML, getString(R.string.ssl_error_warning),
                     getString(R.string.ssl_error_example), mBrowserBailOutToken,
                     getString(R.string.ssl_error_continue));
             view.loadDataWithBaseURL(INTERNAL_ASSETS, html, "text/HTML", "UTF-8", null);
         }

         @Override
         public boolean shouldOverrideUrlLoading (WebView view, String url) {
             if (url.startsWith("tel:")) {
                 startActivity(new Intent(Intent.ACTION_DIAL, Uri.parse(url)));
                 return true;
             }
             return false;
         }
     }

     private class MyWebChromeClient extends WebChromeClient {
         @Override
         public void onProgressChanged(WebView view, int newProgress) {
             final ProgressBar myProgressBar = (ProgressBar) findViewById(R.id.progress_bar);
             myProgressBar.setProgress(newProgress);
         }
     }
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* 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.android.captiveportallogin;

	import android.app.Activity;
	import android.app.LoadedApk;
	import android.content.Context;
	import android.content.Intent;
	import android.graphics.Bitmap;
	import android.net.CaptivePortal;
	import android.net.ConnectivityManager;
	import android.net.ConnectivityManager.NetworkCallback;
	import android.net.Network;
	import android.net.NetworkCapabilities;
	import android.net.NetworkRequest;
	import android.net.Proxy;
	import android.net.Uri;
	import android.net.http.SslError;
	import android.os.Bundle;
	import android.provider.Settings;
	import android.util.ArrayMap;
	import android.util.Log;
	import android.util.TypedValue;
	import android.view.Menu;
	import android.view.MenuItem;
	import android.webkit.SslErrorHandler;
	import android.webkit.WebChromeClient;
	import android.webkit.WebSettings;
	import android.webkit.WebView;
	import android.webkit.WebViewClient;
	import android.widget.ProgressBar;
	import android.widget.TextView;

	import java.io.IOException;
	import java.net.HttpURLConnection;
	import java.net.MalformedURLException;
	import java.net.URL;
	import java.lang.InterruptedException;
	import java.lang.reflect.Field;
	import java.lang.reflect.Method;
	import java.util.Random;

	public class CaptivePortalLoginActivity extends Activity {
	private static final String TAG = "CaptivePortalLogin";
	private static final String DEFAULT_SERVER = "connectivitycheck.gstatic.com";
	private static final int SOCKET_TIMEOUT_MS = 10000;

	private enum Result { DISMISSED, UNWANTED, WANTED_AS_IS };

	private URL mURL;
	private Network mNetwork;
	private CaptivePortal mCaptivePortal;
	private NetworkCallback mNetworkCallback;
	private ConnectivityManager mCm;
	private boolean mLaunchBrowser = false;
	private MyWebViewClient mWebViewClient;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	String server = Settings.Global.getString(getContentResolver(), "captive_portal_server");
	if (server == null) server = DEFAULT_SERVER;
	mCm = ConnectivityManager.from(this);
	String url = getIntent().getStringExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL_URL);
	try {
	mURL = url != null ? new URL(url) : new URL("http", server, "/generate_204");
	} catch (MalformedURLException e) {
	// System misconfigured, bail out in a way that at least provides network access.
	Log.e(TAG, "Invalid captive portal URL, server=" + server);
	done(Result.WANTED_AS_IS);
	}
	mNetwork = getIntent().getParcelableExtra(ConnectivityManager.EXTRA_NETWORK);
	mCaptivePortal = getIntent().getParcelableExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL);

	// Also initializes proxy system properties.
	mCm.bindProcessToNetwork(mNetwork);

	// Proxy system properties must be initialized before setContentView is called because
	// setContentView initializes the WebView logic which in turn reads the system properties.
	setContentView(R.layout.activity_captive_portal_login);

	getActionBar().setDisplayShowHomeEnabled(false);

	// Exit app if Network disappears.
	final NetworkCapabilities networkCapabilities = mCm.getNetworkCapabilities(mNetwork);
	if (networkCapabilities == null) {
	finish();
	return;
	}
	mNetworkCallback = new NetworkCallback() {
	@Override
	public void onLost(Network lostNetwork) {
	if (mNetwork.equals(lostNetwork)) done(Result.UNWANTED);
	}
	};
	final NetworkRequest.Builder builder = new NetworkRequest.Builder();
	for (int transportType : networkCapabilities.getTransportTypes()) {
	builder.addTransportType(transportType);
	}
	mCm.registerNetworkCallback(builder.build(), mNetworkCallback);

	final WebView myWebView = (WebView) findViewById(R.id.webview);
	myWebView.clearCache(true);
	WebSettings webSettings = myWebView.getSettings();
	webSettings.setJavaScriptEnabled(true);
	mWebViewClient = new MyWebViewClient();
	myWebView.setWebViewClient(mWebViewClient);
	myWebView.setWebChromeClient(new MyWebChromeClient());
	// Start initial page load so WebView finishes loading proxy settings.
	// Actual load of mUrl is initiated by MyWebViewClient.
	myWebView.loadData("", "text/html", null);
	}

	// Find WebView's proxy BroadcastReceiver and prompt it to read proxy system properties.
	private void setWebViewProxy() {
	LoadedApk loadedApk = getApplication().mLoadedApk;
	try {
	Field receiversField = LoadedApk.class.getDeclaredField("mReceivers");
	receiversField.setAccessible(true);
	ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk);
	for (Object receiverMap : receivers.values()) {
	for (Object rec : ((ArrayMap) receiverMap).keySet()) {
	Class clazz = rec.getClass();
	if (clazz.getName().contains("ProxyChangeListener")) {
	Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class,
	Intent.class);
	Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION);
	onReceiveMethod.invoke(rec, getApplicationContext(), intent);
	Log.v(TAG, "Prompting WebView proxy reload.");
	}
	}
	}
	} catch (Exception e) {
	Log.e(TAG, "Exception while setting WebView proxy: " + e);
	}
	}

	private void done(Result result) {
	if (mNetworkCallback != null) {
	mCm.unregisterNetworkCallback(mNetworkCallback);
	mNetworkCallback = null;
	}
	switch (result) {
	case DISMISSED:
	mCaptivePortal.reportCaptivePortalDismissed();
	break;
	case UNWANTED:
	mCaptivePortal.ignoreNetwork();
	break;
	case WANTED_AS_IS:
	mCaptivePortal.useNetwork();
	break;
	}
	finish();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
	getMenuInflater().inflate(R.menu.captive_portal_login, menu);
	return true;
	}

	@Override
	public void onBackPressed() {
	WebView myWebView = (WebView) findViewById(R.id.webview);
	if (myWebView.canGoBack() && mWebViewClient.allowBack()) {
	myWebView.goBack();
	} else {
	super.onBackPressed();
	}
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
	int id = item.getItemId();
	if (id == R.id.action_use_network) {
	done(Result.WANTED_AS_IS);
	return true;
	}
	if (id == R.id.action_do_not_use_network) {
	done(Result.UNWANTED);
	return true;
	}
	return super.onOptionsItemSelected(item);
	}

	@Override
	public void onDestroy() {
	super.onDestroy();

	if (mNetworkCallback != null) {
	mCm.unregisterNetworkCallback(mNetworkCallback);
	mNetworkCallback = null;
	}
	if (mLaunchBrowser) {
	// Give time for this network to become default. After 500ms just proceed.
	for (int i = 0; i < 5; i++) {
	// TODO: This misses when mNetwork underlies a VPN.
	if (mNetwork.equals(mCm.getActiveNetwork())) break;
	try {
	Thread.sleep(100);
	} catch (InterruptedException e) {
	}
	}
	startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(mURL.toString())));
	}
	}

	private void testForCaptivePortal() {
	new Thread(new Runnable() {
	public void run() {
	// Give time for captive portal to open.
	try {
	Thread.sleep(1000);
	} catch (InterruptedException e) {
	}
	HttpURLConnection urlConnection = null;
	int httpResponseCode = 500;
	try {
	urlConnection = (HttpURLConnection) mURL.openConnection();
	urlConnection.setInstanceFollowRedirects(false);
	urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS);
	urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS);
	urlConnection.setUseCaches(false);
	urlConnection.getInputStream();
	httpResponseCode = urlConnection.getResponseCode();
	} catch (IOException e) {
	} finally {
	if (urlConnection != null) urlConnection.disconnect();
	}
	if (httpResponseCode == 204) {
	done(Result.DISMISSED);
	}
	}
	}).start();
	}

	private class MyWebViewClient extends WebViewClient {
	private static final String INTERNAL_ASSETS = "file:///android_asset/";
	private final String mBrowserBailOutToken = Long.toString(new Random().nextLong());
	// How many Android device-independent-pixels per scaled-pixel
	// dp/sp = (px/sp) / (px/dp) = (1/sp) / (1/dp)
	private final float mDpPerSp = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 1,
	getResources().getDisplayMetrics()) /
	TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1,
	getResources().getDisplayMetrics());
	private int mPagesLoaded;

	// If we haven't finished cleaning up the history, don't allow going back.
	public boolean allowBack() {
	return mPagesLoaded > 1;
	}

	@Override
	public void onPageStarted(WebView view, String url, Bitmap favicon) {
	if (url.contains(mBrowserBailOutToken)) {
	mLaunchBrowser = true;
	done(Result.WANTED_AS_IS);
	return;
	}
	// The first page load is used only to cause the WebView to
	// fetch the proxy settings. Don't update the URL bar, and
	// don't check if the captive portal is still there.
	if (mPagesLoaded == 0) return;
	// For internally generated pages, leave URL bar listing prior URL as this is the URL
	// the page refers to.
	if (!url.startsWith(INTERNAL_ASSETS)) {
	final TextView myUrlBar = (TextView) findViewById(R.id.url_bar);
	myUrlBar.setText(url);
	}
	testForCaptivePortal();
	}

	@Override
	public void onPageFinished(WebView view, String url) {
	mPagesLoaded++;
	if (mPagesLoaded == 1) {
	// Now that WebView has loaded at least one page we know it has read in the proxy
	// settings. Now prompt the WebView read the Network-specific proxy settings.
	setWebViewProxy();
	// Load the real page.
	view.loadUrl(mURL.toString());
	return;
	} else if (mPagesLoaded == 2) {
	// Prevent going back to empty first page.
	view.clearHistory();
	}
	testForCaptivePortal();
	}

	// Convert Android device-independent-pixels (dp) to HTML size.
	private String dp(int dp) {
	// HTML px's are scaled just like dp's, so just add "px" suffix.
	return Integer.toString(dp) + "px";
	}

	// Convert Android scaled-pixels (sp) to HTML size.
	private String sp(int sp) {
	// Convert sp to dp's.
	float dp = sp * mDpPerSp;
	// Apply a scale factor to make things look right.
	dp *= 1.3;
	// Convert dp's to HTML size.
	return dp((int)dp);
	}

	// A web page consisting of a large broken lock icon to indicate SSL failure.
	private final String SSL_ERROR_HTML = "<html><head><style>" +
	"body { margin-left:" + dp(48) + "; margin-right:" + dp(48) + "; " +
	"margin-top:" + dp(96) + "; background-color:#fafafa; }" +
	"img { width:" + dp(48) + "; height:" + dp(48) + "; }" +
	"div.warn { font-size:" + sp(16) + "; margin-top:" + dp(16) + "; " +
	" opacity:0.87; line-height:1.28; }" +
	"div.example { font-size:" + sp(14) + "; margin-top:" + dp(16) + "; " +
	" opacity:0.54; line-height:1.21905; }" +
	"a { font-size:" + sp(14) + "; text-decoration:none; text-transform:uppercase; " +
	" margin-top:" + dp(24) + "; display:inline-block; color:#4285F4; " +
	" height:" + dp(48) + "; font-weight:bold; }" +
	"</style></head><body><p><img src=quantum_ic_warning_amber_96.png><br>" +
	"<div class=warn>%s</div>" +
	"<div class=example>%s</div>" +
	"<a href=%s>%s</a></body></html>";

	@Override
	public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
	Log.w(TAG, "SSL error (error: " + error.getPrimaryError() + " host: " +
	// Only show host to avoid leaking private info.
	Uri.parse(error.getUrl()).getHost() + " certificate: " +
	error.getCertificate() + "); displaying SSL warning.");
	final String html = String.format(SSL_ERROR_HTML, getString(R.string.ssl_error_warning),
	getString(R.string.ssl_error_example), mBrowserBailOutToken,
	getString(R.string.ssl_error_continue));
	view.loadDataWithBaseURL(INTERNAL_ASSETS, html, "text/HTML", "UTF-8", null);
	}

	@Override
	public boolean shouldOverrideUrlLoading (WebView view, String url) {
	if (url.startsWith("tel:")) {
	startActivity(new Intent(Intent.ACTION_DIAL, Uri.parse(url)));
	return true;
	}
	return false;
	}
	}

	private class MyWebChromeClient extends WebChromeClient {
	@Override
	public void onProgressChanged(WebView view, int newProgress) {
	final ProgressBar myProgressBar = (ProgressBar) findViewById(R.id.progress_bar);
	myProgressBar.setProgress(newProgress);
	}
	}
	}