Added the possibility to jump to a specific page

app/src/main/java/com/gsnathan/pdfviewer/MainActivity.java

@@ -28,6 +28,7 @@
 import android.app.ActivityManager;
 import android.app.Dialog;
 import android.content.ActivityNotFoundException;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.database.Cursor;
@@ -39,13 +40,17 @@
 import android.preference.PreferenceManager;
 import android.print.PrintManager;
 import android.provider.OpenableColumns;
+import android.text.InputType;
 import android.util.Log;
+import android.view.Gravity;
+import android.view.KeyEvent;
 import android.view.WindowManager;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.Window;
+import android.widget.EditText;
 import android.widget.Toast;
 
 import androidx.activity.result.ActivityResultLauncher;
@@ -446,6 +451,50 @@ void navToSettings() {
         settingsLauncher.launch(new Intent(this, SettingsActivity.class));
     }
 
+    private void goToPage(){
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setTitle(getResources().getString(R.string.go_to_page));
+
+        EditText input = new EditText(this);
+        input.setInputType(InputType.TYPE_CLASS_NUMBER);
+        input.setGravity(Gravity.CENTER);
+
+        builder.setView(input);
+
+        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                jumpToPage(Integer.parseInt(input.getText().toString()));
+            }
+        });
+        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                dialog.cancel();
+            }
+        });
+
+        builder.setOnKeyListener((dialog, keyCode, event) -> {
+            if (keyCode == KeyEvent.KEYCODE_ENTER) {
+                dialog.cancel();
+                jumpToPage(Integer.parseInt(input.getText().toString()));
+                return true;
+            }
+            return false;
+        });
+        builder.show();
+    }
+
+    private void jumpToPage(int page){
+        if(viewBinding.pdfView.getPageCount() == 0){
+            return;
+        }
+        pageNumber = page - 1;
+        viewBinding.pdfView.jumpTo(pageNumber);
+        viewBinding.pdfView.performPageSnap();
+        setCurrentPage(pageNumber, viewBinding.pdfView.getPageCount());
+    }
+
     private void setCurrentPage(int page, int pageCount) {
         pageNumber = page;
         setTitle(String.format("%s %s / %s", pdfFileName + " ", page + 1, pageCount));
@@ -521,6 +570,9 @@ public boolean onOptionsItemSelected(MenuItem item) {
             case R.id.settings:
                 navToSettings();
                 return true;
+            case R.id.go_to_page:
+                goToPage();
+                return true;
             default:
                 return super.onOptionsItemSelected(item);
         }

app/src/main/java/com/gsnathan/pdfviewer/Utils.java

@@ -52,7 +52,8 @@ static void showLog(AppCompatActivity context) {
                 new WhatsNewItem("Full screen mode", "A new button has been added to the bottom bar to read PDFs in full screen!", R.drawable.star_icon),
                 new WhatsNewItem("Keep the screen on while reading", "You can enable this feature in Settings.", R.drawable.star_icon),
                 new WhatsNewItem("Sharing improvements and fixes", "Including better support for third-party share dialogs.", R.drawable.star_icon),
-                new WhatsNewItem("Bugs", "A bunch of bug fixes and robustness improvements.", R.drawable.star_icon)
+                new WhatsNewItem("Bugs", "A bunch of bug fixes and robustness improvements.", R.drawable.star_icon),
+                new WhatsNewItem("Jump to page", "You can now jump to a specific page", R.drawable.star_icon)
         );
         log.setTitleColor(Color.BLACK);
         log.setTitleText(context.getResources().getString(R.string.appChangelog));

app/src/main/res/menu/menu.xml

@@ -26,6 +26,12 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto">
 
+    <item
+        android:id="@+id/go_to_page"
+        android:orderInCategory="1"
+        android:title="@string/go_to_page"
+        app:showAsAction="never" />
+
     <item
         android:id="@+id/action_about"
         android:orderInCategory="3"

app/src/main/res/values-it/strings.xml

@@ -6,6 +6,7 @@
     <string name="toast_ssl_error">Connessione sicura fallita.</string>
     <string name="saved_to_download">Il file è stato salvato nella cartella dei download.</string>
     <string name="save_to_download_failed">Non è stato possibile salvare il file nella cartella dei download.</string>
+    <string name="go_to_page">Vai a pagina</string>
     <string name="action_about">Informazioni su…</string>
     <string name="version">Versione</string>
     <string name="intro">Ripeti l\'introduzione</string>

app/src/main/res/values-ru-rRU/strings.xml

@@ -41,6 +41,7 @@
     <string name="fling">Перелистывание страниц</string>
 
     <!-- About -->
+    <string name="go_to_page">Перейти на страницу</string>
     <string name="action_about">О приложении</string>
     <string name="app_info">Информация о приложении</string>
     <string name="intro">Повтор введения</string>

app/src/main/res/values/strings.xml

@@ -31,6 +31,7 @@
     <string name="toast_ssl_error">Secure connection failed.</string>
     <string name="saved_to_download">File saved to Download folder.</string>
     <string name="save_to_download_failed">Couldn\'t save file to Download folder.</string>
+    <string name="go_to_page">Go to page</string>
     <string name="action_about">About</string>
     <string name="version">Version</string>
     <string name="intro">Replay Intro</string>