+ // Get a handle for the progress bar.
+ final ProgressBar progressBar = findViewById(R.id.progress_bar);
+
+ mainWebView.setWebChromeClient(new WebChromeClient() {
+ // Update the progress bar when a page is loading.
+ @Override
+ public void onProgressChanged(WebView view, int progress) {
+ // Inject the night mode CSS if night mode is enabled.
+ if (nightMode) {
+ // `background-color: #212121` sets the background to be dark gray. `color: #BDBDBD` sets the text color to be light gray. `box-shadow: none` removes a lower underline on links
+ // used by WordPress. `text-decoration: none` removes all text underlines. `text-shadow: none` removes text shadows, which usually have a hard coded color.
+ // `border: none` removes all borders, which can also be used to underline text.
+ // `a {color: #1565C0}` sets links to be a dark blue. `!important` takes precedent over any existing sub-settings.
+ mainWebView.evaluateJavascript("(function() {var parent = document.getElementsByTagName('head').item(0); var style = document.createElement('style'); style.type = 'text/css'; " +
+ "style.innerHTML = '* {background-color: #212121 !important; color: #BDBDBD !important; box-shadow: none !important; text-decoration: none !important;" +
+ "text-shadow: none !important; border: none !important;} a {color: #1565C0 !important;}'; parent.appendChild(style)})()", value -> {
+ // Initialize a `Handler` to display `mainWebView`.
+ Handler displayWebViewHandler = new Handler();
+
+ // Setup a `Runnable` to display `mainWebView` after a delay to allow the CSS to be applied.
+ Runnable displayWebViewRunnable = () -> {
+ // Only display `mainWebView` if the progress bar is one. This prevents the display of the `WebView` while it is still loading.
+ if (progressBar.getVisibility() == View.GONE) {
+ mainWebView.setVisibility(View.VISIBLE);
+ }
+ };
+
+ // Use `displayWebViewHandler` to delay the displaying of `mainWebView` for 500 milliseconds.
+ displayWebViewHandler.postDelayed(displayWebViewRunnable, 500);
+ });
+ }
+
+ // Update the progress bar.
+ progressBar.setProgress(progress);
+
+ // Set the visibility of the progress bar.
+ if (progress < 100) {
+ // Show the progress bar.
+ progressBar.setVisibility(View.VISIBLE);
+ } else {
+ // Hide the progress bar.
+ progressBar.setVisibility(View.GONE);
+
+ // Display `mainWebView` if night mode is disabled.
+ // Because of a race condition between `applyDomainSettings` and `onPageStarted`, when night mode is set by domain settings the `WebView` may be hidden even if night mode is not
+ // currently enabled.
+ if (!nightMode) {
+ mainWebView.setVisibility(View.VISIBLE);
+ }
+
+ //Stop the swipe to refresh indicator if it is running
+ swipeRefreshLayout.setRefreshing(false);
+ }
+ }
+
+ // Set the favorite icon when it changes.
+ @Override
+ public void onReceivedIcon(WebView view, Bitmap icon) {
+ // Only update the favorite icon if the website has finished loading.
+ if (progressBar.getVisibility() == View.GONE) {
+ // Save a copy of the favorite icon.
+ favoriteIconBitmap = icon;
+
+ // Place the favorite icon in the appBar.
+ favoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true));
+ }
+ }
+
+ // Save a copy of the title when it changes.
+ @Override
+ public void onReceivedTitle(WebView view, String title) {
+ // Save a copy of the title.
+ webViewTitle = title;
+ }
+
+ // Enter full screen video.
+ @Override
+ public void onShowCustomView(View view, CustomViewCallback callback) {
+ // Pause the ad if this is the free flavor.
+ if (BuildConfig.FLAVOR.contentEquals("free")) {
+ // The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
+ AdHelper.pauseAd(findViewById(R.id.adview));
+ }
+
+ // Remove the translucent overlays.
+ getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+ // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
+ drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+
+ /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+ * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+ * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+ */
+ rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+
+ // Set `rootCoordinatorLayout` to fill the entire screen.
+ rootCoordinatorLayout.setFitsSystemWindows(false);
+
+ // Disable the sliding drawers.
+ drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
+
+ // Add `view` to `fullScreenVideoFrameLayout` and display it on the screen.
+ fullScreenVideoFrameLayout.addView(view);
+ fullScreenVideoFrameLayout.setVisibility(View.VISIBLE);
+ }
+
+ // Exit full screen video.
+ @Override
+ public void onHideCustomView() {
+ // Hide `fullScreenVideoFrameLayout`.
+ fullScreenVideoFrameLayout.removeAllViews();
+ fullScreenVideoFrameLayout.setVisibility(View.GONE);
+
+ // Enable the sliding drawers.
+ drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
+
+ // Add the translucent status flag. This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
+ getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+ // Set `rootCoordinatorLayout` to fit inside the status and navigation bars. This also clears the `SYSTEM_UI` flags.
+ rootCoordinatorLayout.setFitsSystemWindows(true);
+
+ // Show the ad if this is the free flavor.
+ if (BuildConfig.FLAVOR.contentEquals("free")) {
+ // Reload the ad. The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
+ AdHelper.loadAd(findViewById(R.id.adview), getApplicationContext(), getString(R.string.ad_id));
+ }
+ }
+
+ // Upload files.
+ @Override
+ public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
+ // Show the file chooser if the device is running API >= 21.
+ if (Build.VERSION.SDK_INT >= 21) {
+ // Store the file path callback.
+ fileChooserCallback = filePathCallback;
+
+ // Create an intent to open a chooser based ont the file chooser parameters.
+ Intent fileChooserIntent = fileChooserParams.createIntent();
+
+ // Open the file chooser. Currently only one `startActivityForResult` exists in this activity, so the request code, used to differentiate them, is simply `0`.
+ startActivityForResult(fileChooserIntent, 0);
+ }
+ return true;
+ }
+ });