在Activity下调用此函数

showDialog(10);

然后重写以下函数

protected Dialog onCreateDialog(int id) {// TODO Auto-generated method stubswitch(id){case 10:return new AlertDialog.Builder(Activity13.this).setTitle(getString(R.string.title)).setMessage(getString(R.string.timeout)).setPositiveButton(getString(R.string.ok),new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog,int which) {}}).create();}return super.onCreateDialog(id);}

就会有这种效果