- Make signing optional

- Enable smaller builds on release

app/build.gradle

@@ -74,21 +74,11 @@ android {
         buildConfigField "String", "BUGFENDER_API_KEY", getBugfenderApiKey()
     }
 
-    signingConfigs {
-        release {
-            storeFile file(RELEASE_STORE_FILE)
-            storePassword RELEASE_STORE_PASSWORD
-            keyAlias RELEASE_KEY_ALIAS
-            keyPassword RELEASE_KEY_PASSWORD
-        }
-    }
-
     buildTypes {
         release {
-            minifyEnabled false
+            minifyEnabled true
             zipAlignEnabled true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
-            signingConfig signingConfigs.release
         }
     }
 
@@ -138,4 +128,6 @@ dependencies {
         transitive = true
     }
     compile 'com.github.javiersantos:AppUpdater:2.6.1'
-}
\ No newline at end of file
+}
+
+apply from: "signing.gradle"
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app/proguard-rules.txt

+-dontobfuscate
+-verbose
+-dump class_files.txt
+-printseeds seeds.txt
+-printusage unused.txt
+
+-keepattributes *Annotation*
+-keepattributes SourceFile,LineNumberTable
+
+-dontwarn okio.**
+-dontwarn org.slf4j.**
+-dontwarn retrofit2.Platform$Java8

app/signing.gradle

+if (project.hasProperty("RELEASE_KEY_ALIAS") &&
+        project.hasProperty("RELEASE_KEY_PASSWORD") &&
+        project.hasProperty("RELEASE_STORE_PASSWORD") &&
+        file(RELEASE_STORE_FILE).exists()) {
+    android {
+        signingConfigs {
+            releaseSigningConfig {
+                storeFile file(RELEASE_STORE_FILE)
+                storePassword RELEASE_STORE_PASSWORD
+                keyAlias RELEASE_KEY_ALIAS
+                keyPassword RELEASE_KEY_PASSWORD
+            }
+        }
+        buildTypes {
+            release {
+                signingConfig signingConfigs.releaseSigningConfig
+            }
+        }
+    }
+}
\ No newline at end of file