WIP Porting category color code from Nextcloud Maps js code

app/release/output-metadata.json

@@ -10,8 +10,8 @@
     {
       "type": "SINGLE",
       "filters": [],
-      "versionCode": 2,
-      "versionName": "0.2",
+      "versionCode": 3,
+      "versionName": "0.3.1",
       "outputFile": "app-release.apk"
     }
   ]

app/src/main/java/it/danieleverducci/nextcloudmaps/utils/Color.java

@@ -0,0 +1,22 @@
+package it.danieleverducci.nextcloudmaps.utils;
+
+public class Color {
+
+    /**
+     * Based on Nextcloud Maps's getLetterColor util
+     * @see "https://github.com/nextcloud/maps/blob/master/src/utils.js"
+     * @param catName category name
+     */
+    public static generareCategoryColor(String catName) {
+        // If category is default, return default color
+
+        // Else
+        int letter1Index = letter1.toLowerCase().charCodeAt(0);
+        int letter2Index = letter2.toLowerCase().charCodeAt(0);
+        var letterCoef = ((letter1Index * letter2Index) % 100) / 100;
+        var h = letterCoef * 360;
+        var s = 75 + letterCoef * 10;
+        var l = 50 + letterCoef * 10;
+        return {h: Math.round(h), s: Math.round(s), l: Math.round(l)};
+    }
+}