prepare Release mode

.gitignore

@@ -6,3 +6,5 @@
 .DS_Store
 /build
 /captures
+release.keystore
+signing.properties

app/build.gradle

@@ -11,10 +11,16 @@ android {
         versionCode 1
         versionName "1.0"
     }
+
+    signingConfigs {
+        release
+    }
+
     buildTypes {
         release {
-            minifyEnabled false
+            minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            signingConfig signingConfigs.release
         }
     }
 }
@@ -25,3 +31,23 @@ dependencies {
     compile 'com.android.support:appcompat-v7:23.3.0'
     compile 'com.jakewharton:butterknife:7.0.1'
 }
+
+def Properties props = new Properties()
+def propFile = new File('signing.properties')
+if (propFile.canRead()) {
+    props.load(new FileInputStream(propFile))
+
+    if (props != null && props.containsKey('STORE_FILE') && props.containsKey('STORE_PASSWORD') &&
+            props.containsKey('KEY_ALIAS') && props.containsKey('KEY_PASSWORD')) {
+        android.signingConfigs.release.storeFile = file(props['STORE_FILE'])
+        android.signingConfigs.release.storePassword = props['STORE_PASSWORD']
+        android.signingConfigs.release.keyAlias = props['KEY_ALIAS']
+        android.signingConfigs.release.keyPassword = props['KEY_PASSWORD']
+    } else {
+        println 'signing.properties found but some entries are missing'
+        android.buildTypes.release.signingConfig = null
+    }
+} else {
+    println 'signing.properties not found'
+    android.buildTypes.release.signingConfig = null
+}

app/proguard-rules.pro

@@ -15,3 +15,16 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
+
+# Butterknife
+-keep class butterknife.** { *; }
+-dontwarn butterknife.internal.**
+-keep class **$$ViewBinder { *; }
+
+-keepclasseswithmembernames class * {
+    @butterknife.* <fields>;
+}
+
+-keepclasseswithmembernames class * {
+    @butterknife.* <methods>;
+}

signing.properties_sample

@@ -0,0 +1,4 @@
+STORE_FILE=/path/to/your.keystore
+STORE_PASSWORD=yourkeypass
+KEY_ALIAS=projectkeyalias
+KEY_PASSWORD=yourkeypass