title: Java how to call kotlin extension method
body: <p>I use kotlin write a extension method</p>
  
  <pre><code>package com.zhongan.zachat.extention
  
  import android.content.Context
  import android.widget.Toast
  
  /**
   * Created by Carl on 2016/12/1.
   *
  *
  */
  
  
  fun Context.toastLong(msg:String) = Toast.makeText(this,msg,Toast.LENGTH_LONG).show()
  
  fun Context.toastshort(msg:String) = Toast.makeText(this,msg,Toast.LENGTH_SHORT).show()
  </code></pre>
  
  <p>when I in <code>kotlin activity</code> call <code>toastLong("test")</code>
  is ok.<br>
  but In <code>java actvity</code>  IDE say can not found this method.</p>
  
  <p>how Can I call kotlin extension method in java code </p>