Use a DialogFragment

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;
/*from  w  w w . ja v  a  2 s  .c o  m*/
public class Fragment1 extends DialogFragment {

    static Fragment1 newInstance(String title) {
        Fragment1 fragment = new Fragment1();
        Bundle args = new Bundle();
        args.putString("title", title);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
          String title = getArguments().getString("title");
          return new AlertDialog.Builder(getActivity())
          .setIcon(R.drawable.ic_launcher)
          .setTitle(title)
          .setPositiveButton("OK",
                  new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog,
                      int whichButton) {
                  ((DialogFragmentExampleActivity)
                          getActivity()).doPositiveClick();
              }
          })
          .setNegativeButton("Cancel",
                  new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog,
                      int whichButton) {
                  ((DialogFragmentExampleActivity)
                          getActivity()).doNegativeClick();
              }
          }).create();
    }

}

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
/*w w w. java 2s  .  c om*/
public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Fragment1 dialogFragment = Fragment1.newInstance (
                "Are you sure you want to do this?");
        dialogFragment.show(getFragmentManager(), "dialog");
    }

    public void doPositiveClick() {
        //---perform steps when user clicks on OK---
        Log.d("DialogFragmentExample", "User clicks on OK");
    }

    public void doNegativeClick() {
        //---perform steps when user clicks on Cancel---
        Log.d("DialogFragmentExample", "User clicks on Cancel");
    }
}