Added proguard configuration

Author: ajungg

build.gradle

@@ -24,7 +24,7 @@ allprojects {
     }
 
     project.ext {
-        sdkVersion='0.6.13'
+        sdkVersion='0.6.14'
         versionCode=1
 
         compileSdkVersion=27

core/build.gradle

@@ -11,6 +11,7 @@ android {
         versionCode project.versionCode
         versionName project.sdkVersion
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles 'proguard-rules.pro'
 
         resValue "string", "okhttp_version", project.okhttpVersion
     }
@@ -40,7 +41,6 @@ dependencies {
     implementation "com.squareup.okhttp3:okhttp:${project.okhttpVersion}"
     implementation "com.squareup.okhttp3:logging-interceptor:${project.okhttpVersion}"
     implementation 'com.google.code.gson:gson:2.8.2'
-    implementation "com.android.support:support-annotations:${project.supportLibraryVersion}"
 
     testImplementation 'junit:junit:4.12'
 

core/proguard-rules.pro

@@ -1,21 +1,28 @@
-# Add project specific ProGuard rules here.
-# You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
+-dontwarn java.lang.invoke.**
 
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
+# OkHttp
+-keepattributes Signature
+-keepattributes *Annotation*
+-keep class okhttp3.** { *; }
+-keep interface okhttp3.** { *; }
+-dontwarn okhttp3.**
 
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
+# Okio
+-keep class sun.misc.Unsafe { *; }
+-dontwarn java.nio.file.*
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
+-dontwarn okio.**
 
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile
+# Picasso
+-dontwarn com.squareup.okhttp.**
+
+# Gson
+-keepattributes Signature
+-keepattributes *Annotation*
+-dontwarn sun.misc.**
+-keep class * implements com.google.gson.TypeAdapterFactory
+-keep class * implements com.google.gson.JsonSerializer
+-keep class * implements com.google.gson.JsonDeserializer
+
+# SDK
+-keep class io.snabble.sdk.** { *; }

core/src/main/java/io/snabble/sdk/Checkout.java

@@ -3,7 +3,6 @@
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
-import android.support.annotation.Keep;
 
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
@@ -34,7 +33,6 @@
 import okhttp3.Response;
 import okhttp3.ResponseBody;
 
-@Keep
 public class Checkout {
     /*
      * Data structures as defined here:

core/src/main/java/io/snabble/sdk/PaymentMethod.java

@@ -1,10 +1,7 @@
 package io.snabble.sdk;
 
-import android.support.annotation.Keep;
-
 import com.google.gson.annotations.SerializedName;
 
-@Keep
 public enum PaymentMethod {
     @SerializedName("cash")
     CASH(false),

core/src/main/java/io/snabble/sdk/Product.java

@@ -1,7 +1,5 @@
 package io.snabble.sdk;
 
-import android.support.annotation.Keep;
-
 import com.google.gson.annotations.SerializedName;
 
 import java.math.BigDecimal;
@@ -10,7 +8,6 @@
 /**
  * Class that holds all of the product information.
  */
-@Keep
 public class Product {
     public enum Type {
         /**

core/src/main/java/io/snabble/sdk/ProductApi.java

@@ -2,8 +2,6 @@
 
 import android.os.Handler;
 import android.os.Looper;
-import android.support.annotation.Keep;
-
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonParseException;
@@ -23,7 +21,6 @@
 import okhttp3.Response;
 import okhttp3.ResponseBody;
 
-@Keep
 class ProductApi {
     private static class ApiProduct {
         private String sku;

core/src/main/java/io/snabble/sdk/Shop.java

@@ -1,7 +1,5 @@
 package io.snabble.sdk;
 
-import android.support.annotation.Keep;
-
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonElement;
@@ -12,7 +10,6 @@
 
 import io.snabble.sdk.utils.Logger;
 
-@Keep
 public class Shop implements Serializable {
     public enum Service {
         @SerializedName("euro")

core/src/main/java/io/snabble/sdk/ShoppingCart.java

@@ -2,7 +2,6 @@
 
 import android.os.Handler;
 import android.os.Looper;
-import android.support.annotation.Keep;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -12,7 +11,6 @@
 
 import io.snabble.sdk.codes.ScannableCode;
 
-@Keep
 public class ShoppingCart {
     public static final int MAX_QUANTITY = 100000;
 

core/src/main/java/io/snabble/sdk/codes/EAN13.java

@@ -1,11 +1,9 @@
 package io.snabble.sdk.codes;
 
-import android.support.annotation.Keep;
 import android.util.SparseIntArray;
 
 import java.io.Serializable;
 
-@Keep
 public class EAN13 extends ScannableCode implements Serializable {
     private String lookupCode;
     private int embeddedData;