diff --git a/demokit/app/Android.mk b/demokit/app/Android.mk
new file mode 100644
index 0000000..293c212
--- /dev/null
+++ b/demokit/app/Android.mk
@@ -0,0 +1,28 @@
+#
+# Copyright (C) 2011 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := tests
+
+LOCAL_SRC_FILES := $(call all-subdir-java-files)
+
+LOCAL_PACKAGE_NAME := DemoKit
+
+LOCAL_JAVA_LIBRARIES := com.android.future.usb.accessory
+
+include $(BUILD_PACKAGE)
diff --git a/demokit/app/AndroidManifest.xml b/demokit/app/AndroidManifest.xml
new file mode 100644
index 0000000..9523587
--- /dev/null
+++ b/demokit/app/AndroidManifest.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2011 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="com.google.DemoKit">
+
+    <application android:label="DemoKit"
+            android:hardwareAccelerated="true">
+        <uses-library android:name="com.android.future.usb.accessory" />
+
+        <activity android:name="DemoKitActivity"
+                  android:label="DemoKit">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+	    <intent-filter>
+                <action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />
+            </intent-filter>
+
+            <meta-data android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
+                android:resource="@xml/accessory_filter" />
+
+
+        </activity>
+    </application>
+</manifest>
\ No newline at end of file
diff --git a/demokit/app/res/drawable-hdpi/greenball.png b/demokit/app/res/drawable-hdpi/greenball.png
new file mode 100644
index 0000000..7851232
--- /dev/null
+++ b/demokit/app/res/drawable-hdpi/greenball.png
Binary files differ
diff --git a/demokit/app/res/drawable-hdpi/icon.png b/demokit/app/res/drawable-hdpi/icon.png
new file mode 100644
index 0000000..8074c4c
--- /dev/null
+++ b/demokit/app/res/drawable-hdpi/icon.png
Binary files differ
diff --git a/demokit/app/res/drawable-hdpi/redball.png b/demokit/app/res/drawable-hdpi/redball.png
new file mode 100644
index 0000000..fba2f5d
--- /dev/null
+++ b/demokit/app/res/drawable-hdpi/redball.png
Binary files differ
diff --git a/demokit/app/res/drawable-ldpi/greenball.png b/demokit/app/res/drawable-ldpi/greenball.png
new file mode 100644
index 0000000..3a814fc
--- /dev/null
+++ b/demokit/app/res/drawable-ldpi/greenball.png
Binary files differ
diff --git a/demokit/app/res/drawable-ldpi/icon.png b/demokit/app/res/drawable-ldpi/icon.png
new file mode 100644
index 0000000..1095584
--- /dev/null
+++ b/demokit/app/res/drawable-ldpi/icon.png
Binary files differ
diff --git a/demokit/app/res/drawable-ldpi/redball.png b/demokit/app/res/drawable-ldpi/redball.png
new file mode 100644
index 0000000..6e0add3
--- /dev/null
+++ b/demokit/app/res/drawable-ldpi/redball.png
Binary files differ
diff --git a/demokit/app/res/drawable-mdpi/greenball.png b/demokit/app/res/drawable-mdpi/greenball.png
new file mode 100644
index 0000000..7851232
--- /dev/null
+++ b/demokit/app/res/drawable-mdpi/greenball.png
Binary files differ
diff --git a/demokit/app/res/drawable-mdpi/icon.png b/demokit/app/res/drawable-mdpi/icon.png
new file mode 100644
index 0000000..8074c4c
--- /dev/null
+++ b/demokit/app/res/drawable-mdpi/icon.png
Binary files differ
diff --git a/demokit/app/res/drawable-mdpi/redball.png b/demokit/app/res/drawable-mdpi/redball.png
new file mode 100644
index 0000000..fba2f5d
--- /dev/null
+++ b/demokit/app/res/drawable-mdpi/redball.png
Binary files differ
diff --git a/demokit/app/res/layout/main.xml b/demokit/app/res/layout/main.xml
new file mode 100644
index 0000000..ec6f61f
--- /dev/null
+++ b/demokit/app/res/layout/main.xml
@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent">
+    <TableLayout android:id="@+id/tableLayout1" android:layout_width="match_parent" android:layout_height="wrap_content" android:addStatesFromChildren="true">
+        <TableRow android:id="@+id/tableRow1" android:layout_width="match_parent" android:layout_gravity="center_vertical" android:orientation="vertical" android:showDividers="beginning|middle|end" android:layout_weight="1" android:layout_height="wrap_content" android:baselineAligned="false" android:gravity="center_vertical" android:layout_marginBottom="8dip">
+            <TextView android:id="@+id/textView17" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/buttons" android:layout_marginRight="8dip"></TextView>
+            <LinearLayout android:id="@+id/linearLayout1" android:layout_height="wrap_content" android:verticalScrollbarPosition="right" android:layout_width="match_parent" android:layout_gravity="fill_horizontal">
+                <TextView android:id="@+id/textView1" android:layout_height="wrap_content" android:layout_width="match_parent" android:text="@string/button1" android:layout_gravity="center_vertical" android:layout_marginRight="8dip"></TextView>
+                <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/redball" android:id="@+id/button1Image"></ImageView>
+            </LinearLayout>
+            <LinearLayout android:id="@+id/linearLayout5" android:layout_width="wrap_content" android:layout_height="wrap_content">
+                <TextView android:layout_width="wrap_content" android:id="@+id/textView2" android:layout_height="wrap_content" android:text="@string/button2" android:layout_gravity="center_vertical" android:layout_marginRight="8dip"></TextView>
+                <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/redball" android:id="@+id/button2Image"></ImageView>
+            </LinearLayout>
+            <LinearLayout android:id="@+id/linearLayout6" android:layout_width="wrap_content" android:layout_height="wrap_content">
+                <TextView android:layout_width="wrap_content" android:id="@+id/textView3" android:layout_height="wrap_content" android:text="@string/button3" android:layout_gravity="center_vertical" android:layout_marginRight="8dip"></TextView>
+                <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/redball" android:id="@+id/button3Image"></ImageView>
+            </LinearLayout>
+        </TableRow>
+        <TableRow android:id="@+id/tableRow14" android:layout_width="wrap_content" android:layout_height="wrap_content">
+            <TextView android:id="@+id/textView19" android:layout_height="wrap_content" android:layout_width="wrap_content"></TextView>
+            <TextView android:id="@+id/textView20" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_gravity="center_horizontal" android:text="@string/led1"></TextView>
+            <TextView android:layout_gravity="center_horizontal" android:id="@+id/textView21" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/led2"></TextView>
+            <TextView android:layout_gravity="center_horizontal" android:id="@+id/textView22" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/led3"></TextView>
+        </TableRow>
+        <TableRow android:layout_height="wrap_content" android:id="@+id/tableRow4" android:layout_width="match_parent" android:layout_weight="1" android:gravity="center_vertical" android:layout_marginBottom="8dip">
+            <TextView android:id="@+id/textView5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="8dip" android:text="@string/red"></TextView>
+            <SeekBar android:layout_height="wrap_content" android:max="255" android:id="@+id/led1Red" android:layout_marginRight="16dip" android:layout_width="250dip"></SeekBar>
+            <SeekBar android:id="@+id/led2Red" android:layout_height="wrap_content" android:max="255" android:layout_marginRight="16dip" android:layout_width="250dip"></SeekBar>
+            <SeekBar android:id="@+id/led3Red" android:layout_height="wrap_content" android:max="255" android:layout_marginRight="16dip" android:layout_width="250dip"></SeekBar>
+        </TableRow>
+        <TableRow android:layout_height="wrap_content" android:id="@+id/tableRow5" android:layout_width="match_parent" android:layout_weight="1" android:gravity="center_vertical" android:layout_marginBottom="8dip">
+            <TextView android:id="@+id/textView6" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="8dip" android:text="@string/green"></TextView>
+            <SeekBar android:layout_height="wrap_content" android:max="255" android:id="@+id/led1Green" android:layout_marginRight="16dip" android:layout_width="250dip"></SeekBar>
+            <SeekBar android:id="@+id/led2Green" android:layout_height="wrap_content" android:max="255" android:layout_marginRight="16dip" android:layout_width="250dip"></SeekBar>
+            <SeekBar android:id="@+id/led3Green" android:layout_height="wrap_content" android:max="255" android:layout_marginRight="16dip" android:layout_width="250dip"></SeekBar>
+        </TableRow>
+        <TableRow android:layout_height="wrap_content" android:id="@+id/tableRow6" android:layout_width="match_parent" android:layout_weight="1" android:gravity="center_vertical" android:layout_marginBottom="8dip">
+            <TextView android:id="@+id/textView7" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="8dip" android:text="@string/blue"></TextView>
+            <SeekBar android:layout_height="wrap_content" android:max="255" android:id="@+id/led1Blue" android:layout_marginRight="16dip" android:layout_width="250dip"></SeekBar>
+            <SeekBar android:id="@+id/led2Blue" android:layout_height="wrap_content" android:max="255" android:layout_marginRight="16dip" android:layout_width="250dip"></SeekBar>
+            <SeekBar android:id="@+id/led3Blue" android:layout_height="wrap_content" android:max="255" android:layout_marginRight="16dip" android:layout_width="250dip"></SeekBar>
+        </TableRow>
+        <TableRow android:layout_height="wrap_content" android:id="@+id/tableRow2" android:layout_width="match_parent" android:layout_weight="1" android:gravity="center_vertical" android:layout_marginBottom="8dip">
+            <TextView android:id="@+id/textView18" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/relays" android:layout_marginRight="8dip"></TextView>
+            <LinearLayout android:id="@+id/linearLayout2" android:layout_width="wrap_content" android:layout_height="wrap_content">
+                <TextView android:text="@string/relay1" android:id="@+id/textView4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="8dip"></TextView>
+                <ToggleButton android:text="ToggleButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/relay1Button"></ToggleButton>
+            </LinearLayout>
+            <LinearLayout android:id="@+id/linearLayout7" android:layout_width="wrap_content" android:layout_height="wrap_content">
+                <TextView android:layout_width="wrap_content" android:id="@+id/textView14" android:layout_height="wrap_content" android:text="@string/relay2" android:layout_marginRight="8dip"></TextView>
+                <ToggleButton android:layout_width="wrap_content" android:text="ToggleButton" android:layout_height="wrap_content" android:id="@+id/relay2Button"></ToggleButton>
+            </LinearLayout>
+        </TableRow>
+        <TableRow android:layout_height="wrap_content" android:id="@+id/tableRow3" android:layout_width="match_parent" android:layout_weight="1" android:layout_marginBottom="8dip">
+            <TextView android:text="@string/temperature" android:id="@+id/textView15" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="8dip"></TextView>
+            <TextView android:id="@+id/temperature" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
+        </TableRow>
+        <TableRow android:layout_height="wrap_content" android:id="@+id/tableRow13" android:layout_width="match_parent" android:layout_weight="1" android:layout_marginBottom="8dip">
+            <TextView android:text="@string/light" android:id="@+id/textView16" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="8dip"></TextView>
+            <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/light"></TextView>
+        </TableRow>
+        <TableRow android:id="@+id/tableRow7" android:layout_width="wrap_content" android:layout_height="wrap_content">
+            <TextView android:layout_marginRight="8dip" android:id="@+id/textView8" android:layout_width="wrap_content" android:text="@string/servos" android:layout_height="wrap_content"></TextView>
+            <SeekBar android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginRight="8dip" android:id="@+id/servo1" android:max="255" android:progress="127"></SeekBar>
+            <SeekBar android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginRight="8dip" android:id="@+id/servo2" android:max="255" android:progress="127"></SeekBar>
+            <SeekBar android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginRight="8dip" android:id="@+id/servo3" android:max="255" android:progress="127"></SeekBar>
+        </TableRow>
+        <TableRow android:layout_width="match_parent" android:id="@+id/tableRow8" android:layout_height="wrap_content">
+            <TextView android:id="@+id/textView9" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/joystick"></TextView>
+            <LinearLayout android:id="@+id/linearLayout3" android:layout_width="wrap_content" android:layout_height="wrap_content">
+                <TextView android:layout_width="wrap_content" android:id="@+id/textView10" android:layout_height="wrap_content" android:text="@string/x" android:layout_marginRight="8dip"></TextView>
+                <TextView android:layout_width="wrap_content" android:id="@+id/joyX" android:layout_height="wrap_content"></TextView>
+            </LinearLayout>
+            <LinearLayout android:id="@+id/linearLayout4" android:layout_width="wrap_content" android:layout_height="wrap_content">
+                <TextView android:layout_width="wrap_content" android:id="@+id/textView12" android:layout_height="wrap_content" android:text="@string/y" android:layout_marginRight="8dip"></TextView>
+                <TextView android:layout_width="wrap_content" android:id="@+id/joyY" android:layout_height="wrap_content"></TextView>
+            </LinearLayout>
+        </TableRow>
+        <TableRow android:layout_width="match_parent" android:id="@+id/tableRow9" android:layout_height="wrap_content">
+            <TextView android:id="@+id/textView11" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:text="@string/cap"></TextView>
+            <ImageView android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_gravity="left" android:src="@drawable/redball" android:id="@+id/cap"></ImageView>
+        </TableRow>
+    </TableLayout>
+
+</LinearLayout>
diff --git a/demokit/app/res/values/strings.xml b/demokit/app/res/values/strings.xml
new file mode 100644
index 0000000..54be6eb
--- /dev/null
+++ b/demokit/app/res/values/strings.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="hello">Hello World, DemoKitActivity!</string>
+    <string name="app_name">DemoKit</string>
+    <string name="button1">1</string>
+    <string name="button2">2</string>
+    <string name="button3">3</string>
+    <string name="led1Red">Led 1 Red</string>
+    <string name="led1Green">Led 1 Green</string>
+    <string name="led1Blue">Led 1 Blue</string>
+    <string name="led2Red">Led 2 Red</string>
+    <string name="led2Green">Led 2 Green</string>
+    <string name="led2Blue">Led 2 Blue</string>
+    <string name="led3Red">Led 3 Red</string>
+    <string name="led3Green">Led 3 Green</string>
+    <string name="led3Blue">Led 3 Blue</string>
+    <string name="relay1">1</string>
+    <string name="relay2">2</string>
+    <string name="temperature">Temperature</string>
+    <string name="light">Light</string>
+    <string name="buttons">Buttons</string>
+    <string name="relays">Relays</string>
+    <string name="led1">Led 1</string>
+    <string name="led2">Led 2</string>
+    <string name="led3">Led 3</string>
+    <string name="red">Red</string>
+    <string name="green">Green</string>
+    <string name="blue">Blue</string>
+    <string name="servos">Servos</string>
+    <string name="x">X</string>
+    <string name="y">Y</string>
+    <string name="joystick">Joystick</string>
+    <string name="cap">Cap Button</string>
+</resources>
diff --git a/demokit/app/res/xml/accessory_filter.xml b/demokit/app/res/xml/accessory_filter.xml
new file mode 100644
index 0000000..5631b03
--- /dev/null
+++ b/demokit/app/res/xml/accessory_filter.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2011 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<resources>
+    <usb-accessory manufacturer="Google, Inc." model="DemoKit" version="1.0" />
+</resources>
diff --git a/demokit/app/src/com/google/DemoKit/DemoKitActivity.java b/demokit/app/src/com/google/DemoKit/DemoKitActivity.java
new file mode 100644
index 0000000..f141cc9
--- /dev/null
+++ b/demokit/app/src/com/google/DemoKit/DemoKitActivity.java
@@ -0,0 +1,457 @@
+package com.google.DemoKit;
+
+import android.app.Activity;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+
+import android.widget.ImageView;
+import android.widget.TextView;
+import android.widget.SeekBar;
+import android.widget.ToggleButton;
+import android.widget.CompoundButton;
+import android.graphics.drawable.Drawable;
+
+import com.android.future.usb.UsbAccessory;
+import com.android.future.usb.UsbManager;
+
+import java.io.FileDescriptor;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+
+public class DemoKitActivity extends Activity implements Runnable, SeekBar.OnSeekBarChangeListener, CompoundButton.OnCheckedChangeListener {
+    private static final String TAG = "DemoKit";
+
+    private static final String ACTION_USB_PERMISSION =
+            "com.google.DemoKit.action.USB_PERMISSION";
+
+    private UsbManager mUsbManager;
+    private PendingIntent mPermissionIntent;
+    private boolean mPermissionRequestPending;
+
+    ParcelFileDescriptor mFileDescriptor;
+    FileInputStream mInputStream;
+    FileOutputStream mOutputStream;
+
+    ImageView mButton1Image;
+    ImageView mButton2Image;
+    ImageView mButton3Image;
+
+    SeekBar mLed1Red;
+    SeekBar mLed1Green;
+    SeekBar mLed1Blue;
+    SeekBar mLed2Red;
+    SeekBar mLed2Green;
+    SeekBar mLed2Blue;
+    SeekBar mLed3Red;
+    SeekBar mLed3Green;
+    SeekBar mLed3Blue;
+
+    ToggleButton mRelay1Button;
+    ToggleButton mRelay2Button;
+
+    TextView mTemperature;
+    TextView mLight;
+
+    SeekBar mServo1;
+    SeekBar mServo2;
+    SeekBar mServo3;
+
+    TextView mJoyX;
+    TextView mJoyY;
+
+    ImageView mCap;
+
+
+    Drawable redball;
+    Drawable greenball;
+
+    private static final int MESSAGE_SWITCH = 1;
+    private static final int MESSAGE_TEMPERATURE = 2;
+    private static final int MESSAGE_LIGHT = 3;
+    private static final int MESSAGE_JOY = 4;
+
+    private class SwitchMsg {
+        private byte sw;
+        private byte state;
+        public SwitchMsg(byte sw, byte state) {
+            this.sw = sw;
+            this.state = state;
+        }
+
+        public byte getSw() {
+            return sw;
+        }
+
+        public byte getState() {
+            return state;
+        }
+    }
+
+    private class TemperatureMsg {
+        private int temperature;
+
+        public TemperatureMsg(int temperature) {
+            this.temperature = temperature;
+        }
+
+        public int getTemperature() {
+            return temperature;
+        }
+    }
+
+    private class LightMsg {
+        private int light;
+
+        public LightMsg(int light) {
+            this.light = light;
+        }
+
+        public int getLight() {
+            return light;
+        }
+    }
+
+    private class JoyMsg {
+        private int x;
+        private int y;
+
+        public JoyMsg(int x, int y) {
+            this.x = x;
+            this.y = y;
+        }
+
+        public int getX() {
+            return x;
+        }
+
+        public int getY() {
+            return y;
+        }
+    }
+
+   private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (ACTION_USB_PERMISSION.equals(intent.getAction())) {
+                synchronized (this) {
+                    UsbAccessory accessory = UsbManager.getAccessory(intent);
+                    if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
+                        openAccessory(accessory);
+                    } else {
+                        Log.d(TAG, "permission denied for accessory " + accessory);
+                    }
+                    mPermissionRequestPending = false;
+                }
+            }
+        }
+    };
+
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        mUsbManager = UsbManager.getInstance(this);
+        mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
+        IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
+        registerReceiver(mUsbReceiver, filter);
+
+        setContentView(R.layout.main);
+
+        mButton1Image = (ImageView)findViewById(R.id.button1Image);
+        mButton2Image = (ImageView)findViewById(R.id.button2Image);
+        mButton3Image = (ImageView)findViewById(R.id.button3Image);
+
+        mLed1Red = (SeekBar)findViewById(R.id.led1Red);
+        mLed1Red.setOnSeekBarChangeListener(this);
+        mLed1Green = (SeekBar)findViewById(R.id.led1Green);
+        mLed1Green.setOnSeekBarChangeListener(this);
+        mLed1Blue = (SeekBar)findViewById(R.id.led1Blue);
+        mLed1Blue.setOnSeekBarChangeListener(this);
+
+        mLed2Red = (SeekBar)findViewById(R.id.led2Red);
+        mLed2Red.setOnSeekBarChangeListener(this);
+        mLed2Green = (SeekBar)findViewById(R.id.led2Green);
+        mLed2Green.setOnSeekBarChangeListener(this);
+        mLed2Blue = (SeekBar)findViewById(R.id.led2Blue);
+        mLed2Blue.setOnSeekBarChangeListener(this);
+
+        mLed3Red = (SeekBar)findViewById(R.id.led3Red);
+        mLed3Red.setOnSeekBarChangeListener(this);
+        mLed3Green = (SeekBar)findViewById(R.id.led3Green);
+        mLed3Green.setOnSeekBarChangeListener(this);
+        mLed3Blue = (SeekBar)findViewById(R.id.led3Blue);
+        mLed3Blue.setOnSeekBarChangeListener(this);
+
+        mRelay1Button = (ToggleButton)findViewById(R.id.relay1Button);
+        mRelay1Button.setOnCheckedChangeListener(this);
+        mRelay2Button = (ToggleButton)findViewById(R.id.relay2Button);
+        mRelay2Button.setOnCheckedChangeListener(this);
+
+        mTemperature = (TextView)findViewById(R.id.temperature);
+        mLight = (TextView)findViewById(R.id.light);
+
+        mServo1 = (SeekBar)findViewById(R.id.servo1);
+        mServo1.setOnSeekBarChangeListener(this);
+        mServo2 = (SeekBar)findViewById(R.id.servo2);
+        mServo2.setOnSeekBarChangeListener(this);
+        mServo3 = (SeekBar)findViewById(R.id.servo3);
+        mServo3.setOnSeekBarChangeListener(this);
+
+        mJoyX = (TextView)findViewById(R.id.joyX);
+        mJoyY = (TextView)findViewById(R.id.joyY);
+
+        mCap = (ImageView)findViewById(R.id.cap);
+
+        redball =   getResources().getDrawable(R.drawable.redball);
+        greenball = getResources().getDrawable(R.drawable.greenball);
+
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        Intent intent = getIntent();
+        Log.d(TAG, "intent: " + intent);
+        UsbAccessory[] accessories = mUsbManager.getAccessoryList();
+        UsbAccessory accessory = (accessories == null ? null : accessories[0]);
+        if (accessory != null) {
+            if (mUsbManager.hasPermission(accessory)) {
+                openAccessory(accessory);
+            } else {
+                synchronized (mUsbReceiver) {
+                    if (!mPermissionRequestPending) {
+                        mUsbManager.requestPermission(accessory, mPermissionIntent);
+                        mPermissionRequestPending = true;
+                    }
+                }
+            }
+        } else {
+            Log.d(TAG, "mAccessory is null");
+        }
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        if (mFileDescriptor != null) {
+            try {
+                mFileDescriptor.close();
+            } catch (IOException e) {
+            } finally {
+                mFileDescriptor = null;
+            }
+        }
+    }
+
+    @Override
+    public void onDestroy() {
+        unregisterReceiver(mUsbReceiver);
+       super.onDestroy();
+    }
+
+    private void openAccessory(UsbAccessory accessory) {
+        Log.d(TAG, "openAccessory: " + accessory);
+        mFileDescriptor = mUsbManager.openAccessory(accessory);
+        if (mFileDescriptor != null) {
+            FileDescriptor fd = mFileDescriptor.getFileDescriptor();
+            mInputStream = new FileInputStream(fd);
+            mOutputStream = new FileOutputStream(fd);
+            Thread thread = new Thread(null, this, "AccessoryChat");
+            thread.start();
+            Log.d(TAG, "openAccessory succeeded");
+        } else {
+            Log.d(TAG, "openAccessory fail");
+        }
+    }
+
+    private int composeInt(byte hi, byte lo) {
+        int val = (int)hi & 0xff;
+        val *= 256;
+        val += (int)lo & 0xff;
+        return val;
+    }
+
+    public void run() {
+        int ret = 0;
+        byte[] buffer = new byte[16384];
+        int i;
+
+        while (ret >= 0) {
+            try {
+                ret = mInputStream.read(buffer);
+            } catch (IOException e) {
+                break;
+            }
+
+            Log.d(TAG, "got bytes " + ret);
+            i = 0;
+            while (i < ret) {
+                int len = ret - i;
+
+                switch (buffer[i]) {
+                case 0x1:
+                    if (len >= 3) {
+                        Message m = Message.obtain(mHandler, MESSAGE_SWITCH);
+                        m.obj = new SwitchMsg(buffer[i+1], buffer[i+2]);
+                        mHandler.sendMessage(m);
+                    }
+                    i += 3;
+                    break;
+
+                case 0x4:
+                    if (len >= 3) {
+                        Message m = Message.obtain(mHandler, MESSAGE_TEMPERATURE);
+                        m.obj = new TemperatureMsg(composeInt(buffer[i+1], buffer[i+2]));
+                        mHandler.sendMessage(m);
+                    }
+                    i += 3;
+                    break;
+
+                case 0x5:
+                    if (len >= 3) {
+                        Message m = Message.obtain(mHandler, MESSAGE_LIGHT);
+                        m.obj = new LightMsg(composeInt(buffer[i+1], buffer[i+2]));
+                        mHandler.sendMessage(m);
+                    }
+                    i += 3;
+                    break;
+
+                case 0x6:
+                    if (len >= 3) {
+                        Message m = Message.obtain(mHandler, MESSAGE_JOY);
+                        m.obj = new JoyMsg(buffer[i+1], buffer[i+2]);
+                        mHandler.sendMessage(m);
+                    }
+                    i += 3;
+                    break;
+
+                default:
+                    Log.d(TAG, "unknown msg: " + buffer[i]);
+                    i = len;
+                    break;
+                }
+            }
+
+        }
+        Log.d(TAG, "thread out");
+    }
+
+    Handler mHandler = new Handler() {
+            @Override
+            public void handleMessage(Message msg) {
+                switch (msg.what) {
+                case MESSAGE_SWITCH:
+                    SwitchMsg o = (SwitchMsg)msg.obj;
+                    if (o.getSw() == 0)
+                        mButton1Image.setImageDrawable(o.getState() != 0 ? greenball : redball);
+                    else if (o.getSw() == 1)
+                        mButton2Image.setImageDrawable(o.getState() != 0 ? greenball : redball);
+                    else if (o.getSw() == 2)
+                        mButton3Image.setImageDrawable(o.getState() != 0 ? greenball : redball);
+                    else if (o.getSw() == 3)
+                        mCap.setImageDrawable(o.getState() != 0 ? greenball : redball);
+                    break;
+
+                case MESSAGE_TEMPERATURE:
+                    TemperatureMsg t = (TemperatureMsg)msg.obj;
+                    mTemperature.setText(String.format("%04x", t.getTemperature()));
+                    break;
+
+                case MESSAGE_LIGHT:
+                    LightMsg l = (LightMsg)msg.obj;
+                    mLight.setText(String.format("%04x", l.getLight()));
+                    break;
+
+                case MESSAGE_JOY:
+                    JoyMsg j = (JoyMsg)msg.obj;
+                    mJoyX.setText(String.format("%d", j.getX()));
+                    mJoyY.setText(String.format("%d", j.getY()));
+                    break;
+
+                }
+            }
+        };
+
+    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+        byte[] buffer = new byte[3];
+        if (progress > 255)
+            progress = 255;
+
+        buffer[0] = 0x2;
+        buffer[1] = -1;
+        buffer[2] = (byte) progress;
+
+        if (seekBar == mLed1Red)
+            buffer[1] = 0x0;
+        else if (seekBar == mLed1Green)
+            buffer[1] = 0x1;
+        else if (seekBar == mLed1Blue)
+            buffer[1] = 0x2;
+        else if (seekBar == mLed2Red)
+            buffer[1] = 0x3;
+        else if (seekBar == mLed2Green)
+            buffer[1] = 0x4;
+        else if (seekBar == mLed2Blue)
+            buffer[1] = 0x5;
+        else if (seekBar == mLed3Red)
+            buffer[1] = 0x6;
+        else if (seekBar == mLed3Green)
+            buffer[1] = 0x7;
+        else if (seekBar == mLed3Blue)
+            buffer[1] = 0x8;
+        else if (seekBar == mServo1)
+            buffer[1] = 0x10;
+        else if (seekBar == mServo2)
+            buffer[1] = 0x11;
+        else if (seekBar == mServo3)
+            buffer[1] = 0x12;
+
+        if (buffer[1] != -1) {
+            try {
+                mOutputStream.write(buffer);
+            } catch (IOException e) {
+                Log.e(TAG, "write failed", e);
+            }
+        }
+
+    }
+
+    public void onStartTrackingTouch(SeekBar seekBar) {
+    }
+
+    public void onStopTrackingTouch(SeekBar seekBar) {
+    }
+
+    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+        byte[] buffer = new byte[3];
+        buffer[0] = 0x3;
+        buffer[1] = -1;
+        buffer[2] = isChecked ? (byte)0x1 : (byte)0x0;
+
+        if (buttonView == mRelay1Button)
+            buffer[1] = 0;
+        else if (buttonView == mRelay2Button)
+            buffer[1] = 1;
+
+        if (buffer[1] != -1) {
+            try {
+                mOutputStream.write(buffer);
+            } catch (IOException e) {
+                Log.e(TAG, "write failed", e);
+            }
+        }
+    }
+}
+