Answer 1

Answer 2

Answer 3

AlertDialog.Builder ab = new AlertDialog.Builder(this);
ab.setMessage("Test")
  .show;

（或） 如果你想要（是的，没有）按钮意味着使用这个

AlertDialog.Builder ab = new AlertDialog.Builder(this);
ab.setMessage("Are you sure you want to exit?")
  .setPositiveButton("Yes", dialogClickListener)
  .setNegativeButton("No", dialogClickListener)
  .show();