Fix: crash when try to open camera on Android 6

android/app/build.gradle

@@ -66,6 +66,9 @@ android {
             // TODO: Add your own signing config for the release build.
             // Signing with the debug keys for now, so `flutter run --release` works.
             signingConfig signingConfigs.debug
+            useProguard true
+
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
         }
     }
 }

android/app/proguard-rules.pro

@@ -0,0 +1,7 @@
+-ignorewarnings
+-keep class * {
+    public private *;
+}
+-dontwarn org.xmlpull.v1.XmlPullParser
+-dontwarn org.xmlpull.v1.XmlSerializer
+-keep class org.xmlpull.v1.* {*;}

pubspec.yaml

@@ -5,7 +5,7 @@ description: Pay with G1.
 # pub.dev using `pub publish`. This is preferred for private packages.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
-version: 0.0.2+8
+version: 0.0.2+9
 
 environment:
   sdk: ">=2.7.0 <3.0.0"