Release modifications

android/app/build.gradle

@@ -14,6 +14,10 @@ if (flutterRoot == null) {
 apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
+def keystorePropertiesFile = rootProject.file("key.properties")
+def keystoreProperties = new Properties()
+keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+
 android {
     compileSdkVersion 27
 
@@ -31,13 +35,26 @@ android {
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
 
-    buildTypes {
+    signingConfigs {
         release {
-            // 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
+            keyAlias keystoreProperties['keyAlias']
+            keyPassword keystoreProperties['keyPassword']
+            storeFile file(keystoreProperties['storeFile'])
+            storePassword keystoreProperties['storePassword']
         }
     }
+
+    buildTypes {
+        release {
+            signingConfig signingConfigs.release
+
+            minifyEnabled true
+            useProguard true
+
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+
 }
 
 flutter {

android/app/proguard-rules.pro

@@ -0,0 +1,16 @@
+#Flutter Wrapper
+-keep class io.flutter.app.** { *; }
+-keep class io.flutter.plugin.**  { *; }
+-keep class io.flutter.util.**  { *; }
+-keep class io.flutter.view.**  { *; }
+-keep class io.flutter.**  { *; }
+-keep class io.flutter.plugins.**  { *; }
+
+# Basic ProGuard rules for Firebase Android SDK 2.0.0+
+-keep class com.firebase.** { *; }
+-keep class org.apache.** { *; }
+-keepnames class com.fasterxml.jackson.** { *; }
+-keepnames class javax.servlet.** { *; }
+-keepnames class org.ietf.jgss.** { *; }
+-dontwarn org.apache.**
+-dontwarn org.w3c.dom.**