+ final WebView mainWebView = (WebView) findViewById(R.id.mainWebView);
+ final Activity mainWebViewActivity = this;
+
+ final ActionBar actionBar = getSupportActionBar();
+ if (actionBar != null) {
+ // Remove the title from the action bar.
+ actionBar.setDisplayShowTitleEnabled(false);
+
+ // Add the custom app_bar layout, which shows the favoriteIcon, urlTextBar, and progressBar.
+ actionBar.setCustomView(R.layout.app_bar);
+ actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
+
+ // Set the "go" button on the keyboard to load the URL in urlTextBox.
+ EditText urlTextBox = (EditText) actionBar.getCustomView().findViewById(R.id.urlTextBox);
+ urlTextBox.setOnKeyListener(new View.OnKeyListener() {
+ public boolean onKey(View v, int keyCode, KeyEvent event) {
+ // If the event is a key-down event on the "enter" button, load the URL.
+ if ((event.getAction() == KeyEvent.ACTION_DOWN) &&
+ (keyCode == KeyEvent.KEYCODE_ENTER)) {
+ // Load the URL into the mainWebView and consume the event.
+ try {
+ loadUrlFromTextBox();
+ } catch (UnsupportedEncodingException e) {
+ e.printStackTrace();
+ }
+ // If the enter key was pressed, consume the event.
+ return true;
+ }
+ // If any other key was pressed, do not consume the event.
+ return false;
+ }
+ });
+ }
+
+ mainWebView.setWebViewClient(new WebViewClient() {
+ // shouldOverrideUrlLoading makes this WebView the default handler for URLs inside the app, so that links are not kicked out to other apps.
+ @Override
+ public boolean shouldOverrideUrlLoading(WebView view, String url) {
+ mainWebView.loadUrl(url);
+ return true;
+ }
+
+ public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
+ Toast.makeText(mainWebViewActivity, "Error loading " + request + " Error: " + error, Toast.LENGTH_LONG).show();
+ }
+
+ // Update the URL in urlTextBox when the page starts to load.
+ @Override
+ public void onPageStarted(WebView view, String url, Bitmap favicon) {
+ if (actionBar != null) {
+ EditText urlTextBox = (EditText) actionBar.getCustomView().findViewById(R.id.urlTextBox);
+ urlTextBox.setText(url);
+ }
+ }
+
+ // Update formattedUrlString and urlTextBox. It is necessary to do this after the page finishes loading because the final URL can change during load.
+ @Override
+ public void onPageFinished(WebView view, String url) {
+ formattedUrlString = url;
+
+ if (actionBar != null) {
+ EditText urlTextBox = (EditText) actionBar.getCustomView().findViewById(R.id.urlTextBox);
+ urlTextBox.setText(formattedUrlString);
+ }
+ }
+ });
+
+ mainWebView.setWebChromeClient(new WebChromeClient() {
+ // Update the progress bar when a page is loading.
+ @Override
+ public void onProgressChanged(WebView view, int progress) {
+ // Make sure that actionBar is not null.
+ if (actionBar != null) {
+ ProgressBar progressBar = (ProgressBar) actionBar.getCustomView().findViewById(R.id.progressBar);
+ progressBar.setProgress(progress);
+ if (progress < 100) {
+ progressBar.setVisibility(View.VISIBLE);
+ } else {
+ progressBar.setVisibility(View.GONE);
+ }
+ }
+ }
+
+ // Set the favorite icon when it changes.
+ @Override
+ public void onReceivedIcon(WebView view, Bitmap icon) {
+ // Make sure that actionBar is not null.
+ if (actionBar != null) {
+ ImageView favoriteIcon = (ImageView) actionBar.getCustomView().findViewById(R.id.favoriteIcon);
+ favoriteIcon.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true));
+ }
+ }
+ });
+
+ mainWebView.setDownloadListener(new DownloadListener() {
+ // Launch the Android download manager when a link leads to a download.
+ @Override
+ public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
+ DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
+ DownloadManager.Request requestUri = new DownloadManager.Request(Uri.parse(url));
+
+ // Add the URL as the description for the download.
+ requestUri.setDescription(url);
+
+ // Show the download notification after the download is completed if the API is 11 or greater.
+ if (Build.VERSION.SDK_INT >= 11) {
+ requestUri.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
+ }
+
+ downloadManager.enqueue(requestUri);
+ Toast.makeText(mainWebViewActivity, "Download started", Toast.LENGTH_SHORT).show();
+ }
+ });