diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml
new file mode 100644
index 0000000..5806fb3
--- /dev/null
+++ b/.idea/kotlinc.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Kotlin2JsCompilerArguments">
+    <option name="sourceMapEmbedSources" />
+    <option name="sourceMapPrefix" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 365d769..3bd451f 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,17 +1,17 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 26
+    compileSdkVersion 27
     defaultConfig {
         applicationId "com.tksls.yellowrectangle"
-        minSdkVersion 19
-        targetSdkVersion 26
+        minSdkVersion 23
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {
-                cppFlags ""
+                cppFlags "-std=c++11"
             }
         }
     }
@@ -30,7 +30,7 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.android.support:appcompat-v7:26.1.0'
+    implementation 'com.android.support:appcompat-v7:27.1.0'
     implementation 'com.android.support.constraint:constraint-layout:1.0.2'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.1'
diff --git a/app/src/main/cpp/native-lib.cpp b/app/src/main/cpp/native-lib.cpp
index 5e4ff20..defe50f 100644
--- a/app/src/main/cpp/native-lib.cpp
+++ b/app/src/main/cpp/native-lib.cpp
@@ -10,7 +10,7 @@ int main(int argc, char **argv) {
     al_install_touch_input();
     al_install_keyboard();
 
-    auto display = al_create_display(0, 0);
+    auto display = al_create_display(640, 480);
     auto queue = al_create_event_queue();
     auto redraw = true;
     auto done = false;
diff --git a/app/src/main/java/com/tksls/yellowrectangle/DrawYellowRectangle.java b/app/src/main/java/com/tksls/yellowrectangle/DrawYellowRectangle.java
index 8406eaa..c24bcf0 100644
--- a/app/src/main/java/com/tksls/yellowrectangle/DrawYellowRectangle.java
+++ b/app/src/main/java/com/tksls/yellowrectangle/DrawYellowRectangle.java
@@ -3,19 +3,23 @@
 
 package com.tksls.yellowrectangle;
 
+import android.util.Log;
+
 import org.liballeg.android.AllegroActivity;
 
 public class DrawYellowRectangle extends AllegroActivity {
+    @Override
+    public void onStart() {
+        super.onStart();
+        Log.i("DrawYellowRectangle", "On Start .....");
+    }
+
     static {
         System.loadLibrary("allegro");
         System.loadLibrary("allegro_primitives");
-        System.loadLibrary("allegro_image");
-        System.loadLibrary("allegro_font");
-        System.loadLibrary("allegro_ttf");
-        System.loadLibrary("allegro_audio");
-        System.loadLibrary("allegro_acodec");
         System.loadLibrary("allegro_color");
     }
+
     public DrawYellowRectangle() {
         super("libnative-lib.so");
     }