update to unity5 plugin error with android AndroidManifest.xml

I wrote a plugin with java , it works with unity4.6. These day I am try update to unity personal edtion, than error happen. when I bulid apk file, it says "No resource found that matches the given name (at 'icon' with value '@drawable/ic_launcher')." , I am sure I had put ic_launcher.png into all drawable folders. after that, I reinstall android sdk , and it seams unity5 need android API21 and bulid tools 23. it still not work. before that, in unity4.6 I use API19 and bulid tools 21, it works. so it's a bug with unity5?

I build the jar with eclipise , I found some one said it was beacuse R.java lost in build, but I am sure R.class is bulid. BTW,And if I delete the android:icon="@drawable/ic_launcher" or change another name , it can bulid , but if I run it ,it crash when invoke java class .

Error: CommandInvokationFailure: Failed to re-package resources. See the Console for details. F:\downloads\sdk\android\adt_2015_10\build-tools\23.0.1\aapt.exe package --auto-add-overlay -v -f -m -J gen -M AndroidManifest.xml -S "res" -I "F:/downloads/sdk/android/adt_2015_10\platforms\android-21\android.jar" -F bin/resources.ap_ stderr[ AndroidManifest.xml:4: error: Error: No resource found that matches the given name (at 'icon' with value '@drawable/ic_launcher'). ] stdout[ Configurations: (default) xhdpi-v4

[link text][1] AndroidManifest.xml

 ![<?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.xys"
     android:versionCode="1"
     android:versionName="1.0"
      
       >
 
     <uses-sdk android:minSdkVersion="10" />
 
     <application
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name" >
         <activity 
             android:screenOrientation="landscape"
             android:name=".UnityTestActivity"
             android:label="@string/app_name" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         
        <activity
             android:screenOrientation="landscape"
             android:name=".WebViewActivity">
         </activity>
     </application>
     
     <!-- 连接互联网的权限 -->
     <uses-permission android:name="android.permission.INTERNET" />
     <!-- SDCard中创建与删除文件权限 -->
 <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
 <!-- SDCard写入数据权限 -->
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
 </manifest>][2]

more pictures here: [1]: http://note.youdao.com/share/web/file.html?id=f373811861eb5c2c42ad76386fdc4b93&type=note [2]: /storage/temp/56498-clipboard.png