diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000000000000000000000000000000000000..94a25f7f4cb416c083d265558da75d457237d671
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/src/main/java/jp/ruby/rubylibrary/MainActivity.java b/app/src/main/java/jp/ruby/rubylibrary/MainActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..d0b4a759bb73d933f6ac5a54e93d23a209556f58
--- /dev/null
+++ b/app/src/main/java/jp/ruby/rubylibrary/MainActivity.java
@@ -0,0 +1,29 @@
+package jp.ruby.rubylibrary;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.widget.TextView;
+
+import java.nio.charset.Charset;
+
+import yuki.resource.extended.StorageIOManager;
+
+public class MainActivity extends Activity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        TextView tv=(TextView)findViewById(R.id.tv);
+        String s= null;
+        try {
+            StorageIOManager.WriteStringToFileSystem(getApplicationContext(),"/storage/emulated/0/1.txt","TEST IO");
+            s = StorageIOManager.ReadStringFromFileSystem(getApplicationContext(),"/system/bin/sh",true);
+            tv.setText(s);
+        } catch (Exception e) {
+            e.printStackTrace();
+            tv.setText(e.getLocalizedMessage());
+        }
+
+    }
+}
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000000000000000000000000000000000000..0c143e3fee0ef11a1809318f3dee46aa48112142
--- /dev/null
+++ b/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="jp.ruby.rubylibrary.MainActivity">
+
+    <TextView
+        android:id="@+id/tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="TextView"
+        tools:layout_editor_absoluteX="3dp"
+        tools:layout_editor_absoluteY="2dp" />
+</android.support.constraint.ConstraintLayout>