comment #6 - Allow to increase the font size for the whole app.

app/src/main/java/app/fedilab/android/BaseMainActivity.java

@@ -36,6 +36,9 @@ import android.view.MenuItem;
 import android.view.SubMenu;
 import android.view.View;
 import android.view.inputmethod.InputMethodManager;
+import android.widget.LinearLayout;
+import android.widget.SeekBar;
+import android.widget.TextView;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -426,6 +429,49 @@ public abstract class BaseMainActivity extends BaseActivity implements NetworkSt
                     Intent intent = new Intent(BaseMainActivity.this, ProxyActivity.class);
                     startActivity(intent);
                     return true;
+                } else if (itemId == R.id.action_size) {
+                    float scale = sharedpreferences.getFloat(getString(R.string.SET_FONT_SCALE), 1.0f);
+
+                    AlertDialog.Builder builder = new AlertDialog.Builder(BaseMainActivity.this, Helper.dialogStyle());
+                    builder.setTitle(R.string.text_size);
+                    View popup_quick_settings = getLayoutInflater().inflate(R.layout.popup_text_size, new LinearLayout(BaseMainActivity.this), false);
+                    builder.setView(popup_quick_settings);
+                    SeekBar set_text_size = popup_quick_settings.findViewById(R.id.set_text_size);
+                    final TextView set_text_size_value = popup_quick_settings.findViewById(R.id.set_text_size_value);
+                    set_text_size_value.setText(String.format("%s%%", scale * 100));
+
+                    set_text_size.setMax(20);
+
+                    set_text_size.setProgress((((int) (scale * 100) - 80) / 5));
+
+                    set_text_size.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+                        @Override
+                        public void onStopTrackingTouch(SeekBar seekBar) {
+                        }
+
+                        @Override
+                        public void onStartTrackingTouch(SeekBar seekBar) {
+                        }
+
+                        @Override
+                        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+
+                            int value = 80 + progress * 5;
+                            float scale = (float) (value) / 100.0f;
+                            set_text_size_value.setText(String.format("%s%%", value));
+                            SharedPreferences.Editor editor = sharedpreferences.edit();
+                            editor.putFloat(getString(R.string.SET_FONT_SCALE), scale);
+                            editor.apply();
+                        }
+                    });
+                    builder.setPositiveButton(R.string.validate, (dialog, which) -> {
+                        BaseMainActivity.this.recreate();
+                        recreate();
+                        dialog.dismiss();
+                    })
+                            .setIcon(android.R.drawable.ic_dialog_alert)
+                            .show();
+                    return true;
                 }
                 return true;
             });

app/src/main/java/app/fedilab/android/activities/BaseActivity.java

@@ -25,6 +25,7 @@ import com.vanniktech.emoji.EmojiManager;
 import com.vanniktech.emoji.one.EmojiOneProvider;
 
 import app.fedilab.android.helper.Helper;
+import app.fedilab.android.helper.ThemeHelper;
 
 
 @SuppressLint("Registered")
@@ -38,6 +39,7 @@ public class BaseActivity extends CyaneaAppCompatActivity {
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        ThemeHelper.adjustFontScale(this, getResources().getConfiguration());
         Helper.setLocale(this);
     }
 

app/src/main/java/app/fedilab/android/helper/ThemeHelper.java

@@ -14,15 +14,20 @@ package app.fedilab.android.helper;
  * You should have received a copy of the GNU General Public License along with Fedilab; if not,
  * see <http://www.gnu.org/licenses>. */
 
+import static android.content.Context.WINDOW_SERVICE;
+
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.ColorStateList;
+import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.os.Bundle;
+import android.util.DisplayMetrics;
 import android.util.TypedValue;
 import android.view.View;
+import android.view.WindowManager;
 import android.view.animation.Animation;
 import android.view.animation.TranslateAnimation;
 
@@ -368,4 +373,21 @@ public class ThemeHelper {
     public interface SlideAnimation {
         void onAnimationEnded();
     }
+
+
+    /**
+     * Allow to change font scale in activities
+     *
+     * @param activity      - Activity
+     * @param configuration - Configuration
+     */
+    public static void adjustFontScale(Activity activity, Configuration configuration) {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
+        configuration.fontScale = prefs.getFloat(activity.getString(R.string.SET_FONT_SCALE), 1.0f);
+        DisplayMetrics metrics = activity.getResources().getDisplayMetrics();
+        WindowManager wm = (WindowManager) activity.getSystemService(WINDOW_SERVICE);
+        wm.getDefaultDisplay().getMetrics(metrics);
+        metrics.scaledDensity = configuration.fontScale * metrics.density;
+        activity.getBaseContext().getResources().updateConfiguration(configuration, metrics);
+    }
 }

app/src/main/java/app/fedilab/android/ui/fragment/settings/FragmentNotificationsSettings.java

@@ -28,7 +28,6 @@ import androidx.preference.ListPreference;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceCategory;
 import androidx.preference.PreferenceFragmentCompat;
-import androidx.preference.PreferenceManager;
 import androidx.preference.PreferenceScreen;
 
 import app.fedilab.android.R;
@@ -74,7 +73,7 @@ public class FragmentNotificationsSettings extends PreferenceFragmentCompat impl
             return;
         }
 
-        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(requireActivity());
+
         ListPreference SET_NOTIFICATION_TYPE = findPreference(getString(R.string.SET_NOTIFICATION_TYPE));
         if (SET_NOTIFICATION_TYPE != null) {
             SET_NOTIFICATION_TYPE.getContext().setTheme(Helper.dialogStyle());

app/src/main/res/layout/popup_text_size.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_gravity="center_vertical"
+    android:orientation="vertical"
+    android:padding="@dimen/drawer_padding">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout_marginTop="20dp"
+        android:text="@string/text_size_change" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        android:layout_marginTop="20dp"
+        android:layout_marginBottom="20dp"
+        android:orientation="horizontal">
+
+        <TextView
+            android:id="@+id/set_text_size_value"
+            android:layout_width="50dp"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:layout_marginStart="10dp" />
+
+        <SeekBar
+            android:id="@+id/set_text_size"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical" />
+    </LinearLayout>
+
+</androidx.appcompat.widget.LinearLayoutCompat>

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

@@ -13,6 +13,10 @@
         android:id="@+id/action_proxy"
         android:title="@string/proxy_set"
         app:showAsAction="never" />
+    <item
+        android:id="@+id/action_size"
+        android:title="@string/text_size"
+        app:showAsAction="never" />
     <item
         android:id="@+id/action_logout_account"
         android:title="@string/action_logout_account"

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

@@ -1494,6 +1494,7 @@
     <string name="SET_NOTIF_POLL" translatable="false">SET_NOTIF_POLL</string>
     <string name="SET_NOTIF_MEDIA" translatable="false">SET_NOTIF_MEDIA</string>
     <string name="SET_NOTIF_STATUS" translatable="false">SET_NOTIF_STATUS</string>
+    <string name="SET_FONT_SCALE" translatable="false">SET_FONT_SCALE</string>
     <string name="SET_NOTIF_FOLLOW_FILTER" translatable="false">SET_NOTIF_FOLLOW_FILTER</string>
     <string name="SET_NOTIF_ADD_FILTER" translatable="false">SET_NOTIF_ADD_FILTER</string>
     <string name="SET_NOTIF_MENTION_FILTER" translatable="false">SET_NOTIF_MENTION_FILTER</string>