Fix text in option menu within image preview

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/java/com/owncloud/android/ui/preview/PreviewImageFragment.java

@@ -24,6 +24,7 @@ package com.owncloud.android.ui.preview;
 import android.accounts.Account;
 import android.app.Activity;
 import android.content.Context;
+import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.Color;
@@ -36,6 +37,8 @@ import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Process;
+import android.text.SpannableString;
+import android.text.style.ForegroundColorSpan;
 import android.util.DisplayMetrics;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -70,6 +73,8 @@ import com.owncloud.android.utils.DisplayUtils;
 import com.owncloud.android.utils.MimeType;
 import com.owncloud.android.utils.MimeTypeUtil;
 
+import org.jetbrains.annotations.NotNull;
+
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
@@ -313,16 +318,28 @@ public class PreviewImageFragment extends FileFragment implements Injectable {
      * {@inheritDoc}
      */
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(@NotNull Menu menu, @NotNull MenuInflater inflater) {
         super.onCreateOptionsMenu(menu, inflater);
         inflater.inflate(R.menu.item_file, menu);
+
+        int nightModeFlag = getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;
+
+        if (Configuration.UI_MODE_NIGHT_NO == nightModeFlag) {
+            for (int i = 0; i < menu.size(); i++) {
+                MenuItem menuItem = menu.getItem(i);
+
+                SpannableString spanString = new SpannableString(menuItem.getTitle().toString());
+                spanString.setSpan(new ForegroundColorSpan(Color.BLACK), 0, spanString.length(), 0);
+                menuItem.setTitle(spanString);
+            }
+        }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
-    public void onPrepareOptionsMenu(Menu menu) {
+    public void onPrepareOptionsMenu(@NotNull Menu menu) {
         super.onPrepareOptionsMenu(menu);
 
         if (containerActivity.getStorageManager() != null && getFile() != null) {