Implemented QrCodeGenerator for Android

EpcQrCode/build.gradle.kts

@@ -2,6 +2,7 @@ import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget
 
 plugins {
     kotlin("multiplatform")
+    id("com.android.library")
 }
 
 
@@ -12,6 +13,8 @@ kotlin {
         }
     }
 
+    android()
+
     ios {
         binaries {
             framework {
@@ -62,6 +65,14 @@ kotlin {
             }
         }
 
+        val androidMain by getting {
+            dependencies {
+                implementation("com.google.zxing:core:3.3.0")
+                implementation("com.google.zxing:android-core:3.3.0")
+                implementation("com.google.zxing:android-integration:3.3.0")
+            }
+        }
+
         val iosMain by getting
         val iosTest by getting
 
@@ -80,6 +91,29 @@ kotlin {
     }
 }
 
+
+android {
+    compileSdkVersion(29)
+    defaultConfig {
+        minSdkVersion(24)
+        targetSdkVersion(29)
+        versionCode = 1
+        versionName = "1.0.0"
+    }
+    buildTypes {
+        getByName("release") {
+            isMinifyEnabled = false
+        }
+    }
+
+    lintOptions {
+        isCheckReleaseBuilds = false
+        //If you want to continue even if errors found use following line
+        isAbortOnError = false
+    }
+}
+
+
 val packForXcode by tasks.creating(Sync::class) {
     group = "build"
     val mode = System.getenv("CONFIGURATION") ?: "DEBUG"

EpcQrCode/src/androidMain/kotlin/net/codinux/banking/epcqrcode/QrCodeGenerator.kt

@@ -0,0 +1,29 @@
+package net.codinux.banking.epcqrcode
+
+import android.graphics.Bitmap
+import android.graphics.Bitmap.CompressFormat
+import android.graphics.Color
+import com.google.zxing.BarcodeFormat
+import com.google.zxing.qrcode.QRCodeWriter
+import java.io.ByteArrayOutputStream
+
+
+class QrCodeGenerator {
+
+    fun generateQrCode(informationToEncode: String, config: EncodeToQrCodeConfig = EncodeToQrCodeConfig()): ByteArray {
+        val bitMatrix = QRCodeWriter().encode(informationToEncode, BarcodeFormat.QR_CODE, config.width, config.height)
+
+        val bitmap = Bitmap.createBitmap(config.width, config.height, Bitmap.Config.RGB_565)
+        for (x in 0 until config.width) {
+            for (y in 0 until config.height) {
+                bitmap.setPixel(x, y, if (bitMatrix.get(x, y)) Color.BLACK else Color.WHITE)
+            }
+        }
+
+        val blob = ByteArrayOutputStream()
+        bitmap.compress(if (config.format == ImageFormat.JPEG) CompressFormat.JPEG else CompressFormat.PNG, 100 /* Ignored for PNGs */, blob)
+
+        return blob.toByteArray()
+    }
+
+}

EpcQrCode/src/commonMain/kotlin/net/codinux/banking/epcqrcode/EncodeToQrCodeConfig.kt

@@ -0,0 +1,9 @@
+package net.codinux.banking.epcqrcode
+
+
+open class EncodeToQrCodeConfig(
+    open val width: Int = 500,
+    open val height: Int = 500,
+    open val format: ImageFormat = ImageFormat.PNG,
+    open val encoding: EpcQrCodeEncoding = EpcQrCodeEncoding.Utf8
+)

EpcQrCode/src/commonMain/kotlin/net/codinux/banking/epcqrcode/EpcQrCodeEncoding.kt

@@ -0,0 +1,7 @@
+package net.codinux.banking.epcqrcode
+
+enum class EpcQrCodeEncoding {
+
+    Utf8
+
+}

EpcQrCode/src/commonMain/kotlin/net/codinux/banking/epcqrcode/ImageFormat.kt

@@ -0,0 +1,12 @@
+package net.codinux.banking.epcqrcode
+
+
+enum class ImageFormat {
+
+//    BMP, // .bmp is not supported on Android
+
+    JPEG,
+
+    PNG
+
+}

EpcQrCode/src/commonMain/kotlin/net/codinux/banking/epcqrcode/MppTest.kt

@@ -7,4 +7,8 @@ class MppTest {
         return "Na hallo, da sieh mal an"
     }
 
+    fun getTestEpcQrCodeContent(): String {
+        return "BCD\n002\n1\nSCT\nRIEKDEMMBRV\nRieka\nDE11720512109876543210\nEUR1234.56\nCHAR\n\nDanke von codinux"
+    }
+
 }

EpcQrCode/src/main/AndroidManifest.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    package="net.codinux.banking.epcqrcode">
+
+</manifest>

EpcQrCodeAndroidApp/src/main/java/net/codinux/banking/epcqrcode/MainActivity.kt

@@ -1,5 +1,6 @@
 package net.codinux.banking.epcqrcode
 
+import android.graphics.BitmapFactory
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import kotlinx.android.synthetic.main.activity_main.*
@@ -15,6 +16,9 @@ class MainActivity : AppCompatActivity() {
         super.onPostCreate(savedInstanceState)
 
         txtMessage.text = MppTest().showMessage()
+
+        val imageBytes = QrCodeGenerator().generateQrCode(MppTest().getTestEpcQrCodeContent())
+        imgGeneratedQrCode.setImageBitmap(BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.size))
     }
 
 }

EpcQrCodeAndroidApp/src/main/res/layout/activity_main.xml

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout
+<LinearLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:tools="http://schemas.android.com/tools"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         tools:context=".MainActivity">
@@ -17,4 +18,11 @@
             app:layout_constraintRight_toRightOf="parent"
             app:layout_constraintTop_toTopOf="parent"/>
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+    <ImageView
+            android:id="@+id/imgGeneratedQrCode"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:scaleType="fitCenter"
+               />
+
+</LinearLayout>