Android:a button click event,"has stoped unexpecte"
<p>This is my code,what's the matter?</p>

<p>Operation result is"has stopped unexpectedly".
It can go through when remove the OnClickListener,that is say,that button to click on the binding is wrong?</p>

<p>Please help me,thank you!</p>

<p>gao.java</p>

<pre><code>package cn.gao; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.*; 

public class gao&lt;hellotwo&gt; extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState);  

        setContentView(R.layout.main); 
        Button btn=(Button)findViewById(R.id.go); 

        btn.setOnClickListener(new View.OnClickListener() 
        { 
                public void onClick(View v) 
                { 
                        EditText edt=(EditText)gao.this.findViewById(R.id.edt); 
                        TextView txt=(TextView)gao.this.findViewById(R.id.txt); 
                        txt.setText(getString(R.string.msg_dialog)+edt.getText()); 
                } 
        }); 
    } 
}
</code></pre>

<p>main.xml</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; 
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    androidrientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    &gt; 

&lt;TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"   
    /&gt; 

&lt;EditText id="@+id/edt" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="" 
/&gt; 
&lt;EditText id="@+id/txt" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="" 
/&gt; 
&lt;Button id="@+id/go" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="@string/go"&gt; 
    &lt;requestFocus /&gt; 
&lt;/Button&gt; 
&lt;/LinearLayout&gt; 
</code></pre>

<p>strings.xml </p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; 
&lt;resources&gt; 
    &lt;string name="hello"&gt;hello android&lt;/string&gt; 
    &lt;string name="app_name"&gt;hellotwo&lt;/string&gt; 
    &lt;string name="tit_dialog"&gt;提示&lt;/string&gt; 
    &lt;string name="msg_dialog"&gt;你好，中国&lt;/string&gt; 
    &lt;string name="ok_dialog"&gt;确定&lt;/string&gt; 
    &lt;string name="go"&gt;浏览&lt;/string&gt; 
&lt;/resources&gt; 
</code></pre>
