Add chart to calibration process

Signed-off-by: Severin Kaderli <severin@kaderli.dev>

src/MagSend/app/build.gradle

@@ -5,12 +5,12 @@ plugins {
 
 android {
     namespace 'dev.kaderli.magsend'
-    compileSdk 32
+    compileSdk 33
 
     defaultConfig {
         applicationId "dev.kaderli.magsend"
         minSdk 28
-        targetSdk 32
+        targetSdk 33
         versionCode 1
         versionName "1.0"
 
@@ -33,11 +33,11 @@ android {
 }
 
 dependencies {
-
     implementation 'androidx.core:core-ktx:1.7.0'
     implementation 'androidx.appcompat:appcompat:1.5.1'
     implementation 'com.google.android.material:material:1.6.1'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

src/MagSend/app/src/main/java/dev/kaderli/magsend/BaseSensorActivity.kt

@@ -2,9 +2,12 @@ package dev.kaderli.magsend
 
 import android.content.Context
 import android.hardware.Sensor
+import android.hardware.SensorEvent
 import android.hardware.SensorEventListener
 import android.hardware.SensorManager
 import android.os.Bundle
+import kotlin.math.pow
+import kotlin.math.sqrt
 
 abstract class BaseSensorActivity : BaseActivity(), SensorEventListener {
   private lateinit var sensorManager: SensorManager;
@@ -18,4 +21,11 @@ abstract class BaseSensorActivity : BaseActivity(), SensorEventListener {
   }
 
   override fun onAccuracyChanged(sensor: Sensor?, accuracy: Int) {}
+
+  override fun onSensorChanged(event: SensorEvent) {
+    val magneticFieldStrength = sqrt(event.values[0].pow(2) + event.values[1].pow(2) + event.values[2].pow(2))
+    sensorValueReceived(magneticFieldStrength)
+  }
+
+  abstract fun sensorValueReceived(magneticFieldStrength: Float)
 }

src/MagSend/app/src/main/java/dev/kaderli/magsend/CalibrationActivity.kt

@@ -1,15 +1,21 @@
 package dev.kaderli.magsend
 
-import android.hardware.SensorEvent
 import android.os.Bundle
 import android.widget.TextView
+import com.github.mikephil.charting.charts.LineChart
+import com.github.mikephil.charting.data.Entry
+import com.github.mikephil.charting.data.LineData
+import com.github.mikephil.charting.data.LineDataSet
 
 class CalibrationActivity : BaseSensorActivity() {
   private lateinit var calibrationValue: TextView
+  private lateinit var chart: LineChart
+  private var data = ArrayList<Entry>()
 
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     calibrationValue = findViewById(R.id.calibrationValue)
+    chart = findViewById(R.id.chart)
     calibrationValue.text = getString(R.string.calibration_value, 0f)
   }
 
@@ -17,7 +23,11 @@ class CalibrationActivity : BaseSensorActivity() {
     return R.layout.activity_calibration
   }
 
-  override fun onSensorChanged(event: SensorEvent) {
+  override fun sensorValueReceived(magneticFieldStrength: Float) {
-    calibrationValue.text = getString(R.string.calibration_value, event.values[0])
+    calibrationValue.text = getString(R.string.calibration_value, magneticFieldStrength)
+    data.add(Entry(data.size.toFloat(), magneticFieldStrength))
+    val dataSet = LineDataSet(data, "Test")
+    chart.data = LineData(dataSet)
+    chart.invalidate()
   }
 }

src/MagSend/app/src/main/res/layout/activity_calibration.xml

@@ -27,4 +27,14 @@
     app:layout_constraintStart_toStartOf="parent"
     app:layout_constraintTop_toBottomOf="@+id/calibrationDescription" />
 
+  <com.github.mikephil.charting.charts.LineChart
+    android:id="@+id/chart"
+    android:layout_width="0dp"
+    android:layout_height="0dp"
+    android:layout_marginTop="@dimen/component_spacing"
+    app:layout_constraintBottom_toBottomOf="parent"
+    app:layout_constraintEnd_toEndOf="parent"
+    app:layout_constraintStart_toStartOf="parent"
+    app:layout_constraintTop_toBottomOf="@+id/calibrationValue" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

src/MagSend/settings.gradle

@@ -10,6 +10,7 @@ dependencyResolutionManagement {
   repositories {
     google()
     mavenCentral()
+    maven { url 'https://jitpack.io' }
   }
 }
 rootProject.name = "MagSend"