Added option to enlarge text size in distraction free mode

app/src/main/java/eu/faircode/email/FragmentMessage.java

@@ -26,6 +26,7 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
+import android.content.res.TypedArray;
 import android.database.Cursor;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
@@ -47,6 +48,7 @@ import android.text.method.LinkMovementMethod;
 import android.text.style.ImageSpan;
 import android.text.style.URLSpan;
 import android.util.Log;
+import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -361,6 +363,8 @@ public class FragmentMessage extends FragmentEx {
                 grpRawHeaders.setVisibility(View.GONE);
                 grpAttachments.setVisibility(View.GONE);
                 grpError.setVisibility(View.GONE);
+
+                setTextSize();
             }
         });
 
@@ -383,6 +387,8 @@ public class FragmentMessage extends FragmentEx {
                     grpRawHeaders.setVisibility(headers ? View.VISIBLE : View.GONE);
                     grpAttachments.setVisibility(adapter != null && adapter.getItemCount() > 0 ? View.VISIBLE : View.GONE);
 
+                    setTextSize();
+
                     return true;
                 }
                 return false;
@@ -668,6 +674,7 @@ public class FragmentMessage extends FragmentEx {
         boolean inOutbox = EntityFolder.OUTBOX.equals(message.folderType);
 
         menu.findItem(R.id.menu_addresses).setVisible(!free);
+        menu.findItem(R.id.menu_text_size).setVisible(free);
         menu.findItem(R.id.menu_thread).setVisible(message.count > 1);
         menu.findItem(R.id.menu_forward).setVisible(message.content && !inOutbox);
         menu.findItem(R.id.menu_show_headers).setChecked(headers);
@@ -683,6 +690,9 @@ public class FragmentMessage extends FragmentEx {
             case R.id.menu_addresses:
                 onMenuAddresses();
                 return true;
+            case R.id.menu_text_size:
+                onMenuTextSize();
+                return true;
             case R.id.menu_thread:
                 onMenuThread();
                 return true;
@@ -714,6 +724,15 @@ public class FragmentMessage extends FragmentEx {
         grpAddresses.setVisibility(addresses ? View.VISIBLE : View.GONE);
     }
 
+    private void onMenuTextSize() {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
+        int size = prefs.getInt("size", 0);
+        size = ++size % 3;
+        prefs.edit().putInt("size", size).apply();
+
+        setTextSize();
+    }
+
     private void onMenuThread() {
         getFragmentManager().popBackStack("thread", FragmentManager.POP_BACK_STACK_INCLUSIVE);
 
@@ -1228,6 +1247,7 @@ public class FragmentMessage extends FragmentEx {
             SpannedString ss = new SpannedString(body);
             boolean has_images = (ss.getSpans(0, ss.length(), ImageSpan.class).length > 0);
 
+            setTextSize();
             tvBody.setText(body);
             btnImages.setVisibility(has_images && !show_images ? View.VISIBLE : View.GONE);
             grpMessage.setVisibility(View.VISIBLE);
@@ -1346,4 +1366,20 @@ public class FragmentMessage extends FragmentEx {
             }
         });
     }
+
+    private void setTextSize() {
+        int style = R.style.TextAppearance_AppCompat_Small;
+
+        if (free) {
+            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
+            int size = prefs.getInt("size", 0);
+            if (size == 1)
+                style = R.style.TextAppearance_AppCompat_Medium;
+            else if (size == 2)
+                style = R.style.TextAppearance_AppCompat_Large;
+        }
+
+        TypedArray ta = getContext().obtainStyledAttributes(style, new int[]{android.R.attr.textSize});
+        tvBody.setTextSize(TypedValue.COMPLEX_UNIT_PX, ta.getDimensionPixelSize(0, 0));
+    }
 }

app/src/main/res/drawable/baseline_format_size_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0"
+        android:tint="?attr/colorControlNormal">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M9,4v3h5v12h3L17,7h5L22,4L9,4zM3,12h3v7h3v-7h3L12,9L3,9v3z"/>
+</vector>

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

@@ -8,6 +8,12 @@
         android:title="@string/title_show_addresses"
         app:showAsAction="ifRoom" />
 
+    <item
+        android:id="@+id/menu_text_size"
+        android:icon="@drawable/baseline_format_size_24"
+        android:title="@string/title_text_size"
+        app:showAsAction="ifRoom" />
+
     <item
         android:id="@+id/menu_thread"
         android:icon="@drawable/baseline_message_24"

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

@@ -214,6 +214,7 @@
     <string name="title_style_image">Insert image</string>
     <string name="title_add_attachment">Add attachment</string>
     <string name="title_show_addresses">Show CC/BCC</string>
+    <string name="title_text_size">Text size</string>
 
     <string name="title_from_missing">Sender missing</string>
     <string name="title_to_missing">Recipient missing</string>