Java не работает на андроиде

DataOutputStream output=new DataOutputStream(con.getOutputStream());
            output.writeBytes(query);
            output.close();
            
            DataInputStream input = new DataInputStream( con.getInputStream() );
            int c=0;
            while((c=input.read())!=-1){
                text += String.valueOf((char)c);
            }
            input.close();

03-22 07:11:43.066: D/AndroidRuntime(346): Shutting down VM
03-22 07:11:43.066: W/dalvikvm(346): threadid=1: thread exiting with uncaught exception (group=0x40015560)
03-22 07:11:43.086: E/AndroidRuntime(346): FATAL EXCEPTION: main
03-22 07:11:43.086: E/AndroidRuntime(346): java.lang.IllegalStateException: Could not execute method of the activity
03-22 07:11:43.086: E/AndroidRuntime(346):  at android.view.View$1.onClick(View.java:2144)
03-22 07:11:43.086: E/AndroidRuntime(346):  at android.view.View.performClick(View.java:2485)
03-22 07:11:43.086: E/AndroidRuntime(346):  at android.view.View$PerformClick.run(View.java:9080)
03-22 07:11:43.086: E/AndroidRuntime(346):  at android.os.Handler.handleCallback(Handler.java:587)
03-22 07:11:43.086: E/AndroidRuntime(346):  at android.os.Handler.dispatchMessage(Handler.java:92)
03-22 07:11:43.086: E/AndroidRuntime(346):  at android.os.Looper.loop(Looper.java:123)
03-22 07:11:43.086: E/AndroidRuntime(346):  at android.app.ActivityThread.main(ActivityThread.java:3683)
03-22 07:11:43.086: E/AndroidRuntime(346):  at java.lang.reflect.Method.invokeNative(Native Method)
03-22 07:11:43.086: E/AndroidRuntime(346):  at java.lang.reflect.Method.invoke(Method.java:507)
03-22 07:11:43.086: E/AndroidRuntime(346):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-22 07:11:43.086: E/AndroidRuntime(346):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-22 07:11:43.086: E/AndroidRuntime(346):  at dalvik.system.NativeStart.main(Native Method)
03-22 07:11:43.086: E/AndroidRuntime(346): Caused by: java.lang.reflect.InvocationTargetException
03-22 07:11:43.086: E/AndroidRuntime(346):  at java.lang.reflect.Method.invokeNative(Native Method)
03-22 07:11:43.086: E/AndroidRuntime(346):  at java.lang.reflect.Method.invoke(Method.java:507)
03-22 07:11:43.086: E/AndroidRuntime(346):  at android.view.View$1.onClick(View.java:2139)
03-22 07:11:43.086: E/AndroidRuntime(346):  ... 11 more
03-22 07:11:43.086: E/AndroidRuntime(346): Caused by: java.net.UnknownHostException: bysay.ru
03-22 07:11:43.086: E/AndroidRuntime(346):  at java.net.InetAddress.lookupHostByName(InetAddress.java:506)
03-22 07:11:43.086: E/AndroidRuntime(346):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:294)
03-22 07:11:43.086: E/AndroidRuntime(346):  at java.net.InetAddress.getAllByName(InetAddress.java:256)
03-22 07:11:43.086: E/AndroidRuntime(346):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:69)
03-22 07:11:43.086: E/AndroidRuntime(346):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
03-22 07:11:43.086: E/AndroidRuntime(346):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322)
03-22 07:11:43.086: E/AndroidRuntime(346):  at org.apache.harmony.luni.internal.net.[url]www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89[/url])
03-22 07:11:43.086: E/AndroidRuntime(346):  at org.apache.harmony.luni.internal.net.[url]www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285[/url])
03-22 07:11:43.086: E/AndroidRuntime(346):  at org.apache.harmony.luni.internal.net.[url]www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267[/url])
03-22 07:11:43.086: E/AndroidRuntime(346):  at org.apache.harmony.luni.internal.net.[url]www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:205[/url])
03-22 07:11:43.086: E/AndroidRuntime(346):  at org.apache.harmony.luni.internal.net.[url]www.protocol.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:614[/url])
03-22 07:11:43.086: E/AndroidRuntime(346):  at com.example.post_request.MainActivity.btnSend(MainActivity.java:47)
03-22 07:11:43.086: E/AndroidRuntime(346):  ... 14 more

package com.example.post_request;
 
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends Activity {
    
    Button btn;
    TextView tv;
    EditText et;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void btnSend(View view) throws IOException{
            Button btn=(Button)findViewById(R.id.btn);
            TextView tv=(TextView)findViewById(R.id.tv);
            EditText et=(EditText)findViewById(R.id.et);
            
            String text="";
            
            URL myurl=new URL("http://bysay.ru/test");
            String query = "test="+ URLEncoder.encode("json2", "UTF-8");
            HttpURLConnection con = (HttpURLConnection)myurl.openConnection();
            
            con.setRequestMethod("POST");
            con.setRequestProperty("Content-length", String.valueOf(query.length()));
            con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            con.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0;Windows98;DigExt)");
            con.setDoOutput(true);
            con.setDoInput(true);
            
            DataOutputStream output=new DataOutputStream(con.getOutputStream());
            output.writeBytes(query);
            output.close();
            
            DataInputStream input = new DataInputStream( con.getInputStream() );
            int c=0;
            while((c=input.read())!=-1){
                text += String.valueOf((char)c);
            }
            input.close();
            
            Toast toast=Toast.makeText(getApplicationContext(), "afasffsa", Toast.LENGTH_LONG);
            toast.show();       
    }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="17dp"
        android:text="@string/hello_world" />
 
    <Button
        android:id="@+id/btn"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:onClick="btnSend"
        android:text="Button" />
 
    <EditText
        android:id="@+id/et"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="57dp"
        android:ems="10" />
 
</RelativeLayout>