Changed minSdkVersion to 19

android/build.gradle

@@ -34,7 +34,7 @@ android {
         main.java.srcDirs += 'src/main/kotlin'
     }
     defaultConfig {
-        minSdkVersion 24
+        minSdkVersion 19
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     lintOptions {
@@ -47,5 +47,7 @@ android {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation "com.journeyapps:zxing-android-embedded:4.0.2"
+    implementation('com.journeyapps:zxing-android-embedded:4.1.0') { transitive = false }
+    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'com.google.zxing:core:3.3.0'
 }

android/src/main/AndroidManifest.xml

@@ -1,3 +1,4 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  package="net.touchcapture.qr.flutterqr">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="net.touchcapture.qr.flutterqr" 
+  xmlns:tools="http://schemas.android.com/tools">
+  <uses-sdk tools:overrideLibrary="com.google.zxing.client.android" />
 </manifest>

example/android/app/build.gradle

@@ -39,7 +39,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "net.touchcapture.qr.flutterqrexample"
-        minSdkVersion 24
+        minSdkVersion 19
         targetSdkVersion 27
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName