diff --git a/corelibrary/build.gradle b/corelibrary/build.gradle
index 1c09787..68c3504 100644
--- a/corelibrary/build.gradle
+++ b/corelibrary/build.gradle
@@ -18,7 +18,7 @@ android {
 
     buildTypes {
         release {
-            minifyEnabled true
+            minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
diff --git a/corelibrary/src/main/java/com/inyomanw/corelibrary/deps/NetworkModule.kt b/corelibrary/src/main/java/com/inyomanw/corelibrary/deps/NetworkModule.kt
index b6df374..336a543 100644
--- a/corelibrary/src/main/java/com/inyomanw/corelibrary/deps/NetworkModule.kt
+++ b/corelibrary/src/main/java/com/inyomanw/corelibrary/deps/NetworkModule.kt
@@ -1,11 +1,13 @@
 package com.inyomanw.corelibrary.deps
 
+import android.content.Context
 import com.google.gson.FieldNamingPolicy
 import com.google.gson.Gson
 import com.google.gson.GsonBuilder
 import com.google.gson.internal.bind.DateTypeAdapter
 import dagger.Module
 import dagger.Provides
+import okhttp3.Cache
 import okhttp3.OkHttpClient
 import okhttp3.logging.HttpLoggingInterceptor
 import retrofit2.Retrofit
@@ -16,7 +18,15 @@ import java.util.concurrent.TimeUnit
 import javax.inject.Singleton
 
 @Module
-class NetworkModule(private val baseUrl: String) {
+class NetworkModule(private val baseUrl: String, private  val context : Context) {
+
+    companion object {
+        const val REQUEST_TIMEOUT = 20
+        const val CACHE_DIR_SIZE_30MB = 30 * 1024 * 1024
+        const val KEEP_ALIVE_DURATION = (30 * 1000).toLong()
+        const val MAX_IDLE_CONNECTIONS = 10
+    }
+
     @Provides
     @Singleton
     fun providesGson(): Gson {
@@ -34,9 +44,17 @@ class NetworkModule(private val baseUrl: String) {
 
     @Provides
     @Singleton
-    fun providesOkHttpClient(loggingInterceptor: HttpLoggingInterceptor): OkHttpClient {
+    fun providesCache() : Cache {
+        return Cache(context.externalCacheDir ?: context.cacheDir, CACHE_DIR_SIZE_30MB.toLong())
+    }
+
+    @Provides
+    @Singleton
+    fun providesOkHttpClient(loggingInterceptor: HttpLoggingInterceptor,
+                             cache: Cache): OkHttpClient {
         return OkHttpClient.Builder()
             .addInterceptor(loggingInterceptor)
+            .cache(cache)
             .readTimeout(20, TimeUnit.SECONDS)
             .writeTimeout(20, TimeUnit.SECONDS)
             .connectTimeout(20, TimeUnit.SECONDS)
diff --git a/corelibrary/src/main/java/com/inyomanw/corelibrary/utils/Ext.kt b/corelibrary/src/main/java/com/inyomanw/corelibrary/utils/Ext.kt
index f4fbbfe..454f705 100644
--- a/corelibrary/src/main/java/com/inyomanw/corelibrary/utils/Ext.kt
+++ b/corelibrary/src/main/java/com/inyomanw/corelibrary/utils/Ext.kt
@@ -1,6 +1,8 @@
 package com.inyomanw.corelibrary.utils
 
+import android.app.Activity
 import android.content.Context
+import android.support.v7.app.AlertDialog
 import android.view.View
 import android.widget.EditText
 import android.widget.ImageView
@@ -127,4 +129,21 @@ fun String.changeDateFormatWithoutTimeZone(oldPattern: String, newPattern: Strin
         e.printStackTrace()
     }
     return res
+}
+
+fun Activity.showDialog(message : String, cancelable : Boolean = false,
+                        positiveButton : String, positiveAction: () -> Unit = {},
+                        negativeButton : String, negativeAction : () -> Unit = {}) {
+    val dialogBuilder = AlertDialog.Builder(this).apply {
+        setMessage(message)
+        setCancelable(cancelable)
+        setPositiveButton(positiveButton) { dialog, _ ->
+            positiveAction()
+            dialog.dismiss()
+        }
+        setNegativeButton(negativeButton) { dialog, which ->
+            negativeAction()
+            dialog.dismiss()
+        }
+    }
 }
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index b75ae29..85be9ea 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -12,8 +12,4 @@ org.gradle.jvmargs=-Xmx1536m
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
 # Kotlin code style for this project: "official" or "obsolete":
-org.gradle.daemon=false
-org.gradle.parallel=true
-org.gradle.configureondemand=true
-android.enableBuildScriptClasspathCheck=false
 kotlin.code.style=official