downgrade zxing:core for minSdkVersion 21

app/build.gradle

@@ -186,9 +186,9 @@ dependencies {
     // https://firebase.google.com/docs/android/setup#available-libraries
 
     // barcode support
-    // per https://github.com/journeyapps/zxing-android-embedded for support of android version 22
-    implementation('com.journeyapps:zxing-android-embedded:4.1.0') { transitive = false }
-    implementation 'com.google.zxing:core:3.4.1'
+    // per https://github.com/journeyapps/zxing-android-embedded#older-sdk-versions for minSdkVersion 21
+    implementation('com.journeyapps:zxing-android-embedded:4.3.0') { transitive = false }
+    implementation 'com.google.zxing:core:3.3.0' // <-- don't update
 
     def work_version = '2.7.1'
 

app/src/main/AndroidManifest.xml

@@ -12,9 +12,6 @@
         android:name="android.hardware.location.gps"
         android:required="false" />
 
-    <!-- per https://github.com/journeyapps/zxing-android-embedded to force support for build 22 -->
-    <uses-sdk tools:overrideLibrary="com.google.zxing.client.android" />
-
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
 

app/src/main/java/com/geeksville/mesh/ui/ChannelFragment.kt

@@ -211,6 +211,7 @@ class ChannelFragment : ScreenFragment("Channel"), Logging {
 
         binding.scanButton.setOnClickListener {
             if ((requireActivity() as MainActivity).hasCameraPermission()) {
+                debug("Starting QR code scanner")
                 val zxingScan = IntentIntegrator.forSupportFragment(this)
                 zxingScan.setCameraId(0)
                 zxingScan.setPrompt("")