Fix build on newer flutter

Added interfaceCount to UsbDevice

CHANGELOG.md

@@ -1,6 +1,9 @@
 ## 0.2.3
 
 * Fixed threading issue ( PR10 )
+* Added interfaceCount
+* Added CH340 VID/PID to example xml.
+* Added exception catch for Device Create
 
 ## 0.2.2
 

android/src/main/java/dev/bessems/usbserial/UsbSerialPlugin.java

@@ -179,6 +179,8 @@ public void onFailed(UsbDevice device) {
             } else {
                 result.error(TAG, "Failed to acquire USB permission.", null);
             }
+        } catch ( java.lang.Exception e ) {
+            result.error(TAG, "Failed to acquire USB device.", null);
         }
     }
 
@@ -202,6 +204,7 @@ private HashMap<String, Object> serializeDevice(UsbDevice device) {
         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
             dev.put("manufacturerName", device.getManufacturerName());
             dev.put("productName", device.getProductName());
+            dev.put("interfaceCount", device.getInterfaceCount());
             /* if the app targets SDK >= android.os.Build.VERSION_CODES.Q and the app does not have permission to read from the device. */
             try {
                 dev.put("serialNumber", device.getSerialNumber());

example/.flutter-plugins-dependencies

@@ -0,0 +1 @@
+{"_info":"// This is a generated file; do not edit or check into version control.","dependencyGraph":[{"name":"usb_serial","dependencies":[]}]}

example/android/app/build.gradle

@@ -25,7 +25,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 28
 
     lintOptions {
         disable 'InvalidPackage'
@@ -35,7 +35,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "dev.bessems.usbserialexample"
         minSdkVersion 24
-        targetSdkVersion 27
+        targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

example/android/gradle.properties

@@ -1 +1,2 @@
 org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true

example/ios/Flutter/flutter_export_environment.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+# This is a generated file; do not edit or check into version control.
+export "FLUTTER_ROOT=C:\flutter"
+export "FLUTTER_APPLICATION_PATH=C:\Devel\usbserial\example"
+export "FLUTTER_TARGET=lib\main.dart"
+export "FLUTTER_BUILD_DIR=build"
+export "SYMROOT=${SOURCE_ROOT}/../build\ios"
+export "FLUTTER_FRAMEWORK_DIR=C:\flutter\bin\cache\artifacts\engine\ios"
+export "FLUTTER_BUILD_NAME=1.0.0"
+export "FLUTTER_BUILD_NUMBER=1"

lib/usb_serial.dart

@@ -195,12 +195,21 @@ class UsbDevice {
   /// The Serial number from the USB device.
   final String serial;
 
+  /// The number of interfaces on this UsbPort
+  final int interfaceCount;
+
   UsbDevice(this.vid, this.pid, this.productName, this.manufacturerName,
-      this.deviceId, this.serial);
+      this.deviceId, this.serial, this.interfaceCount);
 
   static UsbDevice fromJSON(dynamic json) {
-    return UsbDevice(json["vid"], json["pid"], json["productName"],
-        json["manufacturerName"], json["deviceId"], json["serialNumber"]);
+    return UsbDevice(
+        json["vid"],
+        json["pid"],
+        json["productName"],
+        json["manufacturerName"],
+        json["deviceId"],
+        json["serialNumber"],
+        json["interfaceCount"]);
   }
 
   @override