If we are unable to generate a barcode, just show nothing

app/src/main/java/com/geeksville/mesh/model/ChannelSet.kt

@@ -3,6 +3,7 @@ package com.geeksville.mesh.model
 import android.graphics.Bitmap
 import android.net.Uri
 import android.util.Base64
+import com.geeksville.android.Logging
 import com.geeksville.mesh.AppOnlyProtos
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.MultiFormatWriter
@@ -11,7 +12,7 @@ import java.net.MalformedURLException
 
 data class ChannelSet(
     val protobuf: AppOnlyProtos.ChannelSet = AppOnlyProtos.ChannelSet.getDefaultInstance()
-) {
+) : Logging {
     companion object {
 
         const val prefix = "https://www.meshtastic.org/d/#"
@@ -62,7 +63,8 @@ data class ChannelSet(
         return Uri.parse("$p$enc")
     }
 
-    fun getChannelQR(): Bitmap {
+    val qrCode
+        get(): Bitmap? = try {
             val multiFormatWriter = MultiFormatWriter()
 
             // We encode as UPPER case for the QR code URL because QR codes are more efficient for that special case
@@ -74,6 +76,10 @@ data class ChannelSet(
                     192
                 )
             val barcodeEncoder = BarcodeEncoder()
-        return barcodeEncoder.createBitmap(bitMatrix)
+            barcodeEncoder.createBitmap(bitMatrix)
+        } catch (ex: Throwable) {
+            errormsg("URL was too complex to render as barcode")
+            null
         }
 }
+

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

@@ -98,7 +98,9 @@ class ChannelFragment : ScreenFragment("Channel"), Logging {
             // doesn't cache radioconfig writes.
             binding.editableCheckbox.isEnabled = connected
 
-            binding.qrView.setImageBitmap(channels.getChannelQR())
+            val bitmap = channels.qrCode
+            if (bitmap != null)
+                binding.qrView.setImageBitmap(bitmap)
 
             val modemConfig = channel.modemConfig
             val channelOption = ChannelOption.fromConfig(modemConfig)