+ public void onBackPressed() {
+ // Check the different options for processing `back`.
+ if (drawerLayout.isDrawerVisible(GravityCompat.START)) { // The navigation drawer is open.
+ // Close the navigation drawer.
+ drawerLayout.closeDrawer(GravityCompat.START);
+ } else if (drawerLayout.isDrawerVisible(GravityCompat.END)){ // The bookmarks drawer is open.
+ // close the bookmarks drawer.
+ drawerLayout.closeDrawer(GravityCompat.END);
+ } else if (displayingFullScreenVideo) { // A full screen video is shown.
+ // Re-enable the screen timeout.
+ fullScreenVideoFrameLayout.setKeepScreenOn(false);
+
+ // Unset the full screen video flag.
+ displayingFullScreenVideo = false;
+
+ // Remove all the views from the full screen video frame layout.
+ fullScreenVideoFrameLayout.removeAllViews();
+
+ // Hide the full screen video frame layout.
+ fullScreenVideoFrameLayout.setVisibility(View.GONE);
+
+ // Enable the sliding drawers.
+ drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
+
+ // Show the main content relative layout.
+ mainContentRelativeLayout.setVisibility(View.VISIBLE);
+
+ // Apply the appropriate full screen mode flags.
+ if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) { // Privacy Browser is currently in full screen browsing mode.
+ // Hide the banner ad in the free flavor.
+ if (BuildConfig.FLAVOR.contentEquals("free")) {
+ // Get a handle for the ad view. This cannot be a class variable because it changes with each ad load.
+ View adView = findViewById(R.id.adview);
+
+ // Hide the banner ad.
+ AdHelper.hideAd(adView);
+ }
+
+ /* Hide the system bars.
+ * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+ * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
+ * 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.
+ */
+ rootFrameLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
+ View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+
+ // Reload the website if the app bar is hidden. Otherwise, there is some bug in Android that causes the WebView to be entirely black.
+ if (hideAppBar) {
+ // Reload the WebView.
+ currentWebView.reload();
+ }
+ } else { // Switch to normal viewing mode.
+ // Remove the `SYSTEM_UI` flags from the root frame layout.
+ rootFrameLayout.setSystemUiVisibility(0);
+ }
+
+ // Reload the ad for the free flavor if not in full screen mode.
+ if (BuildConfig.FLAVOR.contentEquals("free") && !inFullScreenBrowsingMode) {
+ // Get a handle for the ad view. This cannot be a class variable because it changes with each ad load.
+ View adView = findViewById(R.id.adview);
+
+ // Reload the ad. `getContext()` can be used instead of `getActivity.getApplicationContext()` once the minimum API >= 23.
+ AdHelper.loadAd(adView, getApplicationContext(), this, getString(R.string.ad_unit_id));
+ }
+ } else if (currentWebView.canGoBack()) { // There is at least one item in the current WebView history.
+ // Get the current web back forward list.
+ WebBackForwardList webBackForwardList = currentWebView.copyBackForwardList();
+
+ // Get the previous entry URL.
+ String previousUrl = webBackForwardList.getItemAtIndex(webBackForwardList.getCurrentIndex() - 1).getUrl();
+
+ // Apply the domain settings.
+ applyDomainSettings(currentWebView, previousUrl, false, false, false);
+
+ // Go back.
+ currentWebView.goBack();
+ } else if (tabLayout.getTabCount() > 1) { // There are at least two tabs.
+ // Close the current tab.
+ closeCurrentTab();
+ } else { // There isn't anything to do in Privacy Browser.
+ // Close Privacy Browser. `finishAndRemoveTask()` also removes Privacy Browser from the recent app list.
+ if (Build.VERSION.SDK_INT >= 21) {
+ finishAndRemoveTask();
+ } else {
+ finish();
+ }
+
+ // Manually kill Privacy Browser. Otherwise, it is glitchy when restarted.
+ System.exit(0);
+ }
+ }
+
+ // Process the results of a file browse.
+ @Override
+ public void onActivityResult(int requestCode, int resultCode, Intent returnedIntent) {
+ // Run the default commands.
+ super.onActivityResult(requestCode, resultCode, returnedIntent);
+
+ // Run the commands that correlate to the specified request code.
+ switch (requestCode) {
+ case BROWSE_FILE_UPLOAD_REQUEST_CODE:
+ // File uploads only work on API >= 21.
+ if (Build.VERSION.SDK_INT >= 21) {
+ // Pass the file to the WebView.
+ fileChooserCallback.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, returnedIntent));
+ }
+ break;
+
+ case BROWSE_OPEN_REQUEST_CODE:
+ // Don't do anything if the user pressed back from the file picker.
+ if (resultCode == Activity.RESULT_OK) {
+ // Get a handle for the open dialog fragment.
+ DialogFragment openDialogFragment = (DialogFragment) getSupportFragmentManager().findFragmentByTag(getString(R.string.open));
+
+ // Only update the file name if the dialog still exists.
+ if (openDialogFragment != null) {
+ // Get a handle for the open dialog.
+ Dialog openDialog = openDialogFragment.getDialog();
+
+ // Remove the incorrect lint warning below that the dialog might be null.
+ assert openDialog != null;
+
+ // Get a handle for the file name edit text.
+ EditText fileNameEditText = openDialog.findViewById(R.id.file_name_edittext);
+
+ // Get the file name URI from the intent.
+ Uri fileNameUri = returnedIntent.getData();
+
+ // Get the file name string from the URI.
+ String fileNameString = fileNameUri.toString();
+
+ // Set the file name text.
+ fileNameEditText.setText(fileNameString);
+
+ // Move the cursor to the end of the file name edit text.
+ fileNameEditText.setSelection(fileNameString.length());
+ }
+ }