android – AlertDialog.Builder类有什么意义？

AlertDialog.builder

AlertDialog.builder alert = new AlertDialog.builder(this)
  .settitle("this is title")
  .setmessage("this is message")
  .setCancelable(false)
  .setPositiveButton("OK",null);
  alert.show();

AlertDialog

AlertDialog alert2 = new AlertDialog.builder(this).create();
alert2.settitle("this is title");
alert2.setmessage("");
alert2.setCancelable(false);
alert2.setButton(AlertDialog.bUTTON_POSITIVE,"OK",new OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog,int which) {
        // null 
    }
});
alert2.show();

所以现在你可能会看到以两种不同的方式创建相同内容的难易程度.