for testing

app/src/main/java/com/example/HPOS/data/model/CalculationVariableForTest.kt

@@ -0,0 +1,12 @@
+package com.example.HPOS.data.model
+
+data class CalculationVariableForTest(
+    var pixelNo: Int,
+    var wavelength: Double,
+    var invertedPixelNo: Int,
+    var I0: Double,
+    var I: Double,
+    var absorbance: Double)
+{
+    constructor() : this(0, 0.0, 0, 0.0, 0.0, 0.0)
+}

app/src/main/java/com/example/HPOS/domain/SaveRawDataTest.kt

@@ -0,0 +1,44 @@
+package com.example.HPOS.domain
+
+import com.example.HPOS.data.model.CalculationVariableForTest
+import com.opencsv.CSVWriter
+import java.io.File
+import java.io.FileWriter
+
+class SaveRawDataTest {
+
+    fun saveCsv(folderPath: String, fileName: String, calculationData: ArrayList<CalculationVariableForTest>) {
+
+        val fullPath  = "$folderPath/$fileName"
+        val writer = CSVWriter(FileWriter(fullPath))
+        val content =  ArrayList<Array<String>>()
+
+        // Header
+        var rowContent = arrayOf("pixel no", "wavelength", "invertedPixelNo", "I0", "I", "absorbance")
+        content.add(rowContent)
+
+        for (eachRow in calculationData){
+            rowContent = arrayOf(eachRow.pixelNo.toString(), eachRow.wavelength.toString(), eachRow.invertedPixelNo.toString(), eachRow.I0.toString(), eachRow.I.toString(), eachRow.absorbance.toString())
+            content.add(rowContent)
+        }
+
+        writer.writeAll(content) // data is adding to csv
+        writer.close()
+    }
+
+    fun saveLog(folderPath: String, fileName: String, isReference: Boolean, fullString: String) {
+        val fileObj = File(folderPath, fileName)
+        val writer = FileWriter(fileObj)
+
+        if (isReference)
+            writer.append("\nREFERENCE OUTPUT\n")
+        else
+            writer.append("\nSAMPLE OUTPUT\n")
+
+        writer.append(fullString)
+        writer.flush()
+        writer.close()
+    }
+
+
+}

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

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <!-- "Mark Favorite", should appear as action button if possible -->
+    <item
+        android:id="@+id/action_favorite"
+        android:icon="@drawable/ic_baseline_usb_24"
+        android:title="@string/usb_connection"
+        app:showAsAction="always"/>
+
+</menu>