Hello Android

Coding ในส่วนของ helloandroid.java ครับ
  

package com.example.helloandroid;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class HelloAndroid extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

       Button okButton = (Button) findViewById(R.id.ok);
       okButton.setOnClickListener(okOnClickListener);
       Button cancelButton = (Button) findViewById(R.id.cancel);
       cancelButton.setOnClickListener(cancelOnClickListener);
}
   private Button.OnClickListener okOnClickListener =
             new Button.OnClickListener(){
       @Override
       public void onClick(View v) {
           EditText edit_text = (EditText) findViewById(R.id.message_text);
           CharSequence edit_text_value = edit_text.getText();
           setTitle("Hello:"+edit_text_value);
       }
   };

   private Button.OnClickListener cancelOnClickListener =
           new Button.OnClickListener(){
       @Override
       public void onClick(View v) {
           finish();
       }
   };
}