Added option to show text high contrast

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

@@ -161,6 +161,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
     private int colorPrimary;
     private int colorAccent;
     private int colorWarning;
+    private int textColorPrimary;
     private int textColorSecondary;
     private int colorUnread;
 
@@ -176,6 +177,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
     private boolean flags;
     private boolean preview;
     private boolean attachments_alt;
+    private boolean contrast;
     private boolean monospaced;
     private boolean autoimages;
     private boolean authentication;
@@ -912,6 +914,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             if (textSize != 0)
                 tvBody.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
 
+            tvBody.setTextColor(contrast ? textColorPrimary : textColorSecondary);
             tvBody.setTypeface(monospaced ? Typeface.MONOSPACE : Typeface.DEFAULT);
             tvBody.setVisibility(View.INVISIBLE);
 
@@ -2894,6 +2897,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         this.colorPrimary = Helper.resolveColor(context, R.attr.colorPrimary);
         this.colorAccent = Helper.resolveColor(context, R.attr.colorAccent);
         this.colorWarning = Helper.resolveColor(context, R.attr.colorWarning);
+        this.textColorPrimary = Helper.resolveColor(context, android.R.attr.textColorPrimary);
         this.textColorSecondary = Helper.resolveColor(context, android.R.attr.textColorSecondary);
         this.colorUnread = Helper.resolveColor(context, R.attr.colorUnread);
 
@@ -2911,6 +2915,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         this.flags = prefs.getBoolean("flags", true);
         this.preview = prefs.getBoolean("preview", false);
         this.attachments_alt = prefs.getBoolean("attachments_alt", false);
+        this.contrast = prefs.getBoolean("contrast", false);
         this.monospaced = prefs.getBoolean("monospaced", false);
         this.autoimages = (this.contacts && prefs.getBoolean("autoimages", false));
         this.authentication = prefs.getBoolean("authentication", false);

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

@@ -39,7 +39,7 @@ public class FragmentOptions extends FragmentBase {
 
     static String[] OPTIONS_RESTART = new String[]{
             "startup", "date", "threading", "avatars", "identicons", "circular", "name_email", "subject_italic", "flags", "preview",
-            "addresses", "attachments_alt", "monospaced", "autohtml", "autoimages", "actionbar",
+            "addresses", "attachments_alt", "contrast", "monospaced", "autohtml", "autoimages", "actionbar",
             "pull", "autoscroll", "swipenav", "autoexpand", "autoclose", "autonext",
             "subscriptions",
             "authentication", "debug"

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

@@ -54,6 +54,7 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
     private SwitchCompat swPreview;
     private SwitchCompat swAddresses;
     private SwitchCompat swAttachmentsAlt;
+    private SwitchCompat swContrast;
     private SwitchCompat swMonospaced;
     private SwitchCompat swInline;
     private SwitchCompat swImages;
@@ -62,7 +63,7 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
 
     private final static String[] RESET_OPTIONS = new String[]{
             "theme", "startup", "date", "threading", "avatars", "identicons", "circular", "name_email", "subject_italic",
-            "flags", "preview", "addresses", "attachments_alt", "monospaced", "inline_images", "autoimages", "autocontent", "actionbar",
+            "flags", "preview", "addresses", "attachments_alt", "contrast", "monospaced", "inline_images", "autoimages", "autocontent", "actionbar",
     };
 
     @Override
@@ -88,6 +89,7 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
         swPreview = view.findViewById(R.id.swPreview);
         swAddresses = view.findViewById(R.id.swAddresses);
         swAttachmentsAlt = view.findViewById(R.id.swAttachmentsAlt);
+        swContrast = view.findViewById(R.id.swContrast);
         swMonospaced = view.findViewById(R.id.swMonospaced);
         swInline = view.findViewById(R.id.swInline);
         swImages = view.findViewById(R.id.swImages);
@@ -200,6 +202,13 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
             }
         });
 
+        swContrast.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("contrast", checked).apply();
+            }
+        });
+
         swMonospaced.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
@@ -300,6 +309,7 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
         swPreview.setChecked(prefs.getBoolean("preview", false));
         swAddresses.setChecked(prefs.getBoolean("addresses", false));
         swAttachmentsAlt.setChecked(prefs.getBoolean("attachments_alt", false));
+        swContrast.setChecked(prefs.getBoolean("contrast", false));
         swMonospaced.setChecked(prefs.getBoolean("monospaced", false));
         swInline.setChecked(prefs.getBoolean("inline_images", false));
         swImages.setChecked(prefs.getBoolean("autoimages", false));

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

@@ -202,6 +202,16 @@
                 app:layout_constraintTop_toBottomOf="@id/swAddresses"
                 app:switchPadding="12dp" />
 
+            <androidx.appcompat.widget.SwitchCompat
+                android:id="@+id/swContrast"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="12dp"
+                android:text="@string/title_advanced_contrast"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/swAttachmentsAlt"
+                app:switchPadding="12dp" />
+
             <androidx.appcompat.widget.SwitchCompat
                 android:id="@+id/swMonospaced"
                 android:layout_width="match_parent"
@@ -209,7 +219,7 @@
                 android:layout_marginTop="12dp"
                 android:text="@string/title_advanced_monospaced"
                 app:layout_constraintStart_toStartOf="parent"
-                app:layout_constraintTop_toBottomOf="@id/swAttachmentsAlt"
+                app:layout_constraintTop_toBottomOf="@id/swContrast"
                 app:switchPadding="12dp" />
 
             <androidx.appcompat.widget.SwitchCompat

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

@@ -207,6 +207,7 @@
     <string name="title_advanced_preview">Show message preview</string>
     <string name="title_advanced_addresses">Show address details by default</string>
     <string name="title_advanced_attachments_alt">Show attachments after the message text</string>
+    <string name="title_advanced_contrast">Use high contrast for message text</string>
     <string name="title_advanced_monospaced">Use monospaced font for message text</string>
     <string name="title_advanced_images_inline">Automatically show inline images</string>
     <string name="title_advanced_images">Automatically show images for known contacts</string>