introduce 'large font' setting

src/main/java/eu/siacs/conversations/AppSettings.java

@@ -42,6 +42,7 @@ public class AppSettings {
     public static final String CHANNEL_DISCOVERY_METHOD = "channel_discovery_method";
     public static final String SEND_CRASH_REPORTS = "send_crash_reports";
     public static final String COLORFUL_CHAT_BUBBLES = "use_green_background";
+    public static final String LARGE_FONT = "large_font";
 
     private final Context context;
 
@@ -98,6 +99,10 @@ public class AppSettings {
         return getBooleanPreference(COLORFUL_CHAT_BUBBLES, R.bool.use_green_background);
     }
 
+    public boolean isLargeFont() {
+        return getBooleanPreference(LARGE_FONT, R.bool.large_font);
+    }
+
     public boolean isUseTor() {
         return getBooleanPreference(USE_TOR, R.bool.use_tor);
     }

src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java

@@ -98,7 +98,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
     private final DisplayMetrics metrics;
     private OnContactPictureClicked mOnContactPictureClickedListener;
     private OnContactPictureLongClicked mOnContactPictureLongClickedListener;
-    private boolean colorfulChatBubbles = false;
+    private BubbleDesign bubbleDesign = new BubbleDesign(false, false);
     private final boolean mForceNames;
 
     public MessageAdapter(
@@ -459,15 +459,13 @@ public class MessageAdapter extends ArrayAdapter<Message> {
     }
 
     private void displayTextMessage(
-            final ViewHolder viewHolder,
+            final ViewHolder viewHolder, final Message message, final BubbleColor bubbleColor) {
-            final Message message,
-            final BubbleColor bubbleColor,
-            int type) {
         viewHolder.download_button.setVisibility(View.GONE);
         viewHolder.image.setVisibility(View.GONE);
         viewHolder.audioPlayer.setVisibility(View.GONE);
         viewHolder.messageBody.setVisibility(View.VISIBLE);
         setTextColor(viewHolder.messageBody, bubbleColor);
+        setTextSize(viewHolder.messageBody, this.bubbleDesign.largeFont);
         viewHolder.messageBody.setTypeface(null, Typeface.NORMAL);
 
         if (message.getBody() != null) {
@@ -804,7 +802,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
             }
         }
 
-        final boolean colorfulBackground = this.colorfulChatBubbles;
+        final boolean colorfulBackground = this.bubbleDesign.colorfulChatBubbles;
         final BubbleColor bubbleColor;
         if (type == RECEIVED) {
             if (isInValidSession) {
@@ -1039,7 +1037,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
                             bubbleColor);
                 }
             } else {
-                displayTextMessage(viewHolder, message, bubbleColor, type);
+                displayTextMessage(viewHolder, message, bubbleColor);
             }
         }
 
@@ -1119,7 +1117,8 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 
     public void updatePreferences() {
         final AppSettings appSettings = new AppSettings(activity);
-        this.colorfulChatBubbles = appSettings.isColorfulChatBubbles();
+        this.bubbleDesign =
+                new BubbleDesign(appSettings.isColorfulChatBubbles(), appSettings.isLargeFont());
     }
 
     public void setHighlightedTerm(List<String> terms) {
@@ -1173,6 +1172,16 @@ public class MessageAdapter extends ArrayAdapter<Message> {
         textView.setTextColor(bubbleToOnSurfaceColor(textView, bubbleColor));
     }
 
+    private static void setTextSize(final TextView textView, final boolean largeFont) {
+        if (largeFont) {
+            textView.setTextAppearance(
+                    com.google.android.material.R.style.TextAppearance_Material3_BodyLarge);
+        } else {
+            textView.setTextAppearance(
+                    com.google.android.material.R.style.TextAppearance_Material3_BodyMedium);
+        }
+    }
+
     private static @ColorInt int bubbleToOnSurfaceVariant(
             final View view, final BubbleColor bubbleColor) {
         final @AttrRes int colorAttributeResId;
@@ -1213,6 +1222,16 @@ public class MessageAdapter extends ArrayAdapter<Message> {
         WARNING
     }
 
+    private static class BubbleDesign {
+        public final boolean colorfulChatBubbles;
+        public final boolean largeFont;
+
+        private BubbleDesign(final boolean colorfulChatBubbles, final boolean largeFont) {
+            this.colorfulChatBubbles = colorfulChatBubbles;
+            this.largeFont = largeFont;
+        }
+    }
+
     private static class ViewHolder {
 
         public MaterialButton load_more_messages;

src/main/res/drawable/ic_format_size_24dp.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M560,800L560,280L360,280L360,160L880,160L880,280L680,280L680,800L560,800ZM200,800L200,480L80,480L80,360L440,360L440,480L320,480L320,800L200,800Z" />
+</vector>

src/main/res/values/defaults.xml

@@ -18,6 +18,7 @@
     <integer name="auto_accept_filesize">524288</integer>
     <string name="picture_compression">auto</string>
     <bool name="use_green_background">true</bool>
+    <bool name="large_font">false</bool>
     <string name="quick_action">recent</string>
     <bool name="show_dynamic_tags">false</bool>
     <bool name="btbv">true</bool>

src/main/res/values/strings.xml

@@ -1055,5 +1055,7 @@
     <string name="pref_category_interaction">Interaction</string>
     <string name="pref_category_on_this_device">On device</string>
     <string name="pref_up_long_summary">When acting as a UnifiedPush Distributor the persistent, reliable and battery-friendly XMPP connection will be utilized to wake up other UnifiedPush compatible app such as Tusky, Ltt.rs, FluffyChat and more.</string>
+    <string name="pref_large_font">Large font</string>
+    <string name="pref_large_font_summary">Increase font size in message bubbles</string>
 
 </resources>

src/main/res/xml/preferences_interface.xml

@@ -21,6 +21,12 @@
             android:key="use_green_background"
             android:summary="@string/pref_use_colorful_bubbles_summary"
             android:title="@string/pref_use_colorful_bubbles" />
+        <SwitchPreferenceCompat
+            android:defaultValue="@bool/large_font"
+            android:icon="@drawable/ic_format_size_24dp"
+            android:key="large_font"
+            android:summary="@string/pref_large_font_summary"
+            android:title="@string/pref_large_font" />
         <SwitchPreferenceCompat
             android:defaultValue="@bool/show_dynamic_tags"
             android:icon="@drawable/ic_label_24dp"