update proguard.

android/consumer-proguard-rules.txt

@@ -17,3 +17,22 @@
 -keepclassmembernames class kotlinx.** {
     volatile <fields>;
 }
+
+## OkHttp
+
+# JSR 305 annotations are for embedding nullability information.
+-dontwarn javax.annotation.**
+
+# A resource is loaded with a relative path so the package of this class must be preserved.
+-keeppackagenames okhttp3.internal.publicsuffix.*
+-adaptresourcefilenames okhttp3/internal/publicsuffix/PublicSuffixDatabase.gz
+
+# Animal Sniffer compileOnly dependency to ensure APIs are compatible with older versions of Java.
+-dontwarn org.codehaus.mojo.animal_sniffer.*
+
+# OkHttp platform used only on JVM and when Conscrypt and other security providers are available.
+-dontwarn okhttp3.internal.platform.**
+-dontwarn org.conscrypt.**
+-dontwarn org.bouncycastle.**
+-dontwarn org.openjsse.**
+

example/android/app/build.gradle

@@ -37,7 +37,7 @@ android {
         applicationId "net.sourceforge.simcpux"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
-        minSdkVersion 19
+        minSdkVersion flutter.minSdkVersion
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
@@ -48,6 +48,7 @@ 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
+            minifyEnabled true
         }
 
         debug {