Added the possibility to customize the allowed maximum zoom

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

@@ -259,10 +259,12 @@ void configurePdfViewAndLoad(PDFView.Configurator viewConfigurator) {
         } else {
             viewBinding.pdfView.setBackgroundColor(0xFF212121);
         }
+        float maxZoom = (float)(prefManager.getInt("max_zoom_pref", 4) + 1);
+        float midZoom = Math.min(2.0f, maxZoom);
         viewBinding.pdfView.useBestQuality(prefManager.getBoolean("quality_pref", false));
         viewBinding.pdfView.setMinZoom(0.5f);
-        viewBinding.pdfView.setMidZoom(2.0f);
-        viewBinding.pdfView.setMaxZoom(5.0f);
+        viewBinding.pdfView.setMidZoom(midZoom);
+        viewBinding.pdfView.setMaxZoom(maxZoom);
         viewConfigurator
                 .defaultPage(pageNumber)
                 .onPageChange(this::setCurrentPage)

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

@@ -6,13 +6,15 @@
 import android.os.Build;
 import android.os.Bundle;
 import android.preference.Preference;
+import android.preference.PreferenceManager;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.MenuItem;
 import android.view.View;
 
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.widget.Toolbar;
+import androidx.preference.SeekBarPreference;
 
 import com.jaredrummler.cyanea.app.CyaneaPreferenceActivity;
 
@@ -51,6 +53,19 @@ private void setupShowInLauncherPreference() {
                 }
             });
         }
+
+        Preference seekBar = (Preference)findPreference("max_zoom_pref");
+        int current_value = PreferenceManager.getDefaultSharedPreferences(this).getInt("max_zoom_pref",5);
+        String seekBarTitle = getResources().getString(R.string.maximum_zoom) + " " + String.valueOf(++current_value);
+        seekBar.setTitle(seekBarTitle);
+        seekBar.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+            @Override
+            public boolean onPreferenceChange(Preference preference, Object o) {
+                final int progress = Integer.valueOf(String.valueOf(o)) + 1;
+                preference.setTitle(getResources().getString(R.string.maximum_zoom) + " " + progress);
+                return true;
+            }
+        });
     }
 
     private void setOptionsListTopMargin() {

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("Custom maximum zoom", "You can now set the maximum zoom.", R.drawable.star_icon)
         );
         log.setTitleColor(Color.BLACK);
         log.setTitleText(context.getResources().getString(R.string.appChangelog));

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

@@ -73,5 +73,6 @@
     <string name="wrong_password">Password errata.</string>
     <string name="dark_pdf">Modalità scura per il PDF</string>
     <string name="keep_screen_on">Mantieni lo schermo acceso</string>
+    <string name="maximum_zoom">Zoom massimo:</string>
     <string name="privacy_info">Questa app non raccoglie alcun dato.\nI seguenti permessi sono richiesti per fornire specifiche funzionalità dell\'applicazione:\n- <b>Internet</b>: aprire i PDF tramite link\n- <b>Archiviazione</b>: aprire file dalla memoria interna, salvare i PDF aperti tramite link</string>
 </resources>

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

@@ -121,5 +121,6 @@
 
     <string name="dark_pdf">Dark theme for PDF</string>
     <string name="keep_screen_on">Keep the screen on</string>
+    <string name="maximum_zoom">Maximum zoom:</string>
     <string name="privacy_info">This app does not collect any data.\nThe following permissions are required to provide specific features in the app:\n- <b>Internet</b>: open PDFs through links\n- <b>Storage</b>: open files from storage, save PDFs opened through links</string>
 </resources>

app/src/main/res/xml/preferences.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen
-    xmlns:android="http://schemas.android.com/apk/res/android">
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
 
     <SwitchPreference
         android:defaultValue="true"
@@ -26,6 +26,12 @@
             android:defaultValue="false"
             android:title="@string/keep_screen_on" android:key="screen_on_pref"/>
 
+        <SeekBarPreference
+            android:defaultValue="4"
+            android:title="@string/maximum_zoom" android:key="max_zoom_pref"
+            android:max="9"
+            app:showSeekBarValue="true"/>
+
     </PreferenceCategory>
 
     <PreferenceCategory