ProgressDialog

Tela

Java

package com.visual;

import android.app.Activity;

import android.app.ProgressDialog;

import android.os.Bundle;

public class ProgressDialogExempo extends Activity {

 private ProgressDialog dialog;

 @Override

 protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         dialog = ProgressDialog.show(this, "Titulo", "Uma mensagem", false, true);

         // faz algo - 2º plano, thread, etc

         dialog.dismiss();

 }

}