Android Prompt Input AlertDialog Popup

package com.myapp;

import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;

public class MainActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
        

        
        // Button1
        final Button btn1 = (Button) findViewById(R.id.button1);
        btn1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            	ShowDialog();
            }	
        });
        
	}
	
	public void ShowDialog()
	{
        final AlertDialog.Builder dDialog = new AlertDialog.Builder(this);
        final EditText input = new EditText(this);

    	dDialog.setTitle("Require! ");
    	dDialog.setMessage("Please input name :");
    	dDialog.setIcon(android.R.drawable.btn_star_big_on); 
    	dDialog.setView(input);
    	
    	// Ok
    	dDialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
    		public void onClick(DialogInterface dialog, int whichButton) {
    		  String value = input.getText().toString();
 			 	Toast.makeText(MainActivity.this,"Your Click [OK] value = " + value ,
		 		     Toast.LENGTH_LONG).show();  
    		  }
    		});
    	
    	// Cancel
    	dDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
    		  public void onClick(DialogInterface dialog, int whichButton) {
    			  String value = input.getText().toString();
       			 	Toast.makeText(MainActivity.this,"Your Click [Cancel] value = " + value ,
       		 		     Toast.LENGTH_LONG).show();  
    		  }
    		});
    	
    	dDialog.show();
    	
	}
	
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}