Support activity level in Yunmai scales (#524)

* Support activity level in Yunmai scales and clean up YunmaiLib

android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothYunmaiSE_Mini.java

@@ -60,12 +60,13 @@ public class BluetoothYunmaiSE_Mini extends BluetoothCommunication {
                 final ScaleUser selectedUser = OpenScale.getInstance().getSelectedScaleUser();
                 byte sex = selectedUser.getGender().isMale() ? (byte)0x01 : (byte)0x02;
                 byte display_unit = selectedUser.getScaleUnit() == Converters.WeightUnit.KG ? (byte) 0x01 : (byte) 0x02;
+                byte body_type = (byte) YunmaiLib.toYunmaiActivityLevel(selectedUser.getActivityLevel());
 
                 byte[] user_add_or_query = new byte[]{
                         (byte) 0x0d, (byte) 0x12, (byte) 0x10, (byte) 0x01, (byte) 0x00, (byte) 0x00,
                         userId[0], userId[1], (byte) selectedUser.getBodyHeight(), sex,
                         (byte) selectedUser.getAge(), (byte) 0x55, (byte) 0x5a, (byte) 0x00,
-                        (byte)0x00, display_unit, (byte) 0x03, (byte) 0x00};
+                        (byte)0x00, display_unit, body_type, (byte) 0x00};
                 user_add_or_query[user_add_or_query.length - 1] =
                         xorChecksum(user_add_or_query, 1, user_add_or_query.length - 1);
                 writeBytes(WEIGHT_CMD_SERVICE, WEIGHT_CMD_CHARACTERISTIC, user_add_or_query);
@@ -129,7 +130,7 @@ public class BluetoothYunmaiSE_Mini extends BluetoothCommunication {
                 sex = 0;
             }
 
-            YunmaiLib yunmaiLib = new YunmaiLib(sex, scaleUser.getBodyHeight());
+            YunmaiLib yunmaiLib = new YunmaiLib(sex, scaleUser.getBodyHeight(), scaleUser.getActivityLevel());
             float bodyFat;
             int resistance = Converters.fromUnsignedInt16Be(weightBytes, 15);
             if (weightBytes[1] >= (byte)0x1E) {

android_app/app/src/main/java/com/health/openscale/core/bluetooth/lib/YunmaiLib.java

@@ -16,13 +16,27 @@
 
 package com.health.openscale.core.bluetooth.lib;
 
+import com.health.openscale.core.utils.Converters.ActivityLevel;
+
 public class YunmaiLib {
     private int sex; // male = 1; female = 0
     private float height;
+    private boolean fitnessBodyType;
 
-    public YunmaiLib(int sex, float height) {
+    static public int toYunmaiActivityLevel(ActivityLevel activityLevel) {
+        switch (activityLevel) {
+            case HEAVY:
+            case EXTREME:
+                return 1;
+            default:
+                return 0;
+        }
+    }
+
+    public YunmaiLib(int sex, float height, ActivityLevel activityLevel) {
         this.sex = sex;
         this.height = height;
+        this.fitnessBodyType = YunmaiLib.toYunmaiActivityLevel(activityLevel) == 1;
     }
 
     public float getWater(float bodyFat) {
@@ -40,14 +54,17 @@ public class YunmaiLib {
             r = (float)Math.sqrt(r);
         }
 
-        if (this.sex == 1) {
-            fat = (weight * 1.5f / h / h) + (age * 0.08f) - 10.8f;
-        } else {
         fat = (weight * 1.5f / h / h) + (age * 0.08f);
+        if (this.sex == 1) {
+            fat -= 10.8f;
         }
 
         fat = (fat - 7.4f) + r;
 
+        if (fat < 5.0f || fat > 75.0f) {
+            fat = 0.0f;
+        }
+
         return fat;
     }
 
@@ -55,7 +72,7 @@ public class YunmaiLib {
         float muscle;
         muscle = (100.0f - bodyFat) * 0.67f;
 
-        if (sex == 1) {
+        if (this.fitnessBodyType) {
             muscle = (100.0f - bodyFat) * 0.7f;
         }
 
@@ -64,6 +81,20 @@ public class YunmaiLib {
         return muscle;
     }
 
+    public float getSkeletalMuscle(float bodyFat) {
+        float muscle;
+
+        muscle = (100.0f - bodyFat) * 0.53f;
+        if (this.fitnessBodyType) {
+            muscle = (100.0f - bodyFat) * 0.6f;
+        }
+
+        muscle = ((muscle * 100.0f) + 0.5f) / 100.0f;
+
+        return muscle;
+    }
+
+
     public float getBoneMass(float muscle, float weight) {
         float boneMass;
 
@@ -81,16 +112,15 @@ public class YunmaiLib {
     }
 
     public float getLeanBodyMass(float weight, float bodyFat) {
-        if (bodyFat < 5.0f || bodyFat > 75.0f) {
-            return 0.0f;
-        }
         return weight * (100.0f - bodyFat) / 100.0f;
     }
 
     public float getVisceralFat(float bodyFat, int age) {
-        float f = (bodyFat < 5.0f || bodyFat > 75.0f) ? 0.0f : bodyFat;
+        float f = bodyFat;
         int a = (age < 18 || age > 120) ? 18 : age;
 
+        float vf;
+        if (!fitnessBodyType) {
             if (sex == 1) {
                 if (a < 40) {
                     f -= 21.0f;
@@ -114,7 +144,7 @@ public class YunmaiLib {
                 d = 1.1f;
             }
 
-        float vf = (f / d) + 9.5f;
+            vf = (f / d) + 9.5f;
             if (vf < 1.0f) {
                 return 1.0f;
             }
@@ -122,5 +152,19 @@ public class YunmaiLib {
                 return 30.0f;
             }
             return vf;
+        } else {
+            if (bodyFat > 15.0f) {
+                vf = (bodyFat - 15.0f) / 1.1f + 12.0f;
+            } else {
+                vf = -1 * (15.0f - bodyFat) / 1.4f + 12.0f;
+            }
+            if (vf < 1.0f) {
+                return 1.0f;
+            }
+            if (vf > 9.0f) {
+                return 9.0f;
+            }
+            return vf;
+        }
     }
 }