Android AlertDialog ในเมธอดอื่นไม่ได้ ทำไงดีครับ ถ้าผมจะเอามาใช้ในเมธอดอื่นด้วยจะต้องทำไงครับ

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.datapage1);
}

public class TabMainActivity  extends Activity {
	/** Called when the activity is first created. */
	AlertDialog.Builder builder;

builder= new AlertDialog.Builder(this);

public class TabMainActivity  extends Activity {
	/** Called when the activity is first created. */
	AlertDialog.Builder builder;

@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		builder = new AlertDialog.Builder(this);
    	builder.setTitle("Error User");
    	builder.setIcon(R.drawable.ic_launcher);
    	builder.setMessage("Do you want to delete or not.");
    	builder.setCancelable(false);
    	builder.setPositiveButton("Edit", new DialogInterface.OnClickListener() {
			public void onClick(DialogInterface dialog, int which) {
				// TODO Auto-generated method stub
				editUser(strUser);
				builder = new AlertDialog.Builder(ShowUserActivity.this);
			}
		});
    	builder.setNegativeButton("Delete", new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// TODO Auto-generated method stub
				dlDeleteUser(strUser);
			}
		});
    	builder.show();
}