Android简单选择框

//监听
Button b=(Button)findViewById(R.id.button);
b.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        ShowChoise();
    }
});

private void ShowChoise()
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this,android.R.style.Theme_Holo_Light_Dialog);
        //builder.setIcon(R.drawable.ic_launcher);
        builder.setTitle("选择一个城市");
        //    指定下拉列表的显示数据
        final String[] cities = {"广州", "上海", "北京", "香港", "澳门"};
        //    设置一个下拉的列表选择项
        builder.setItems(cities, new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                Toast.makeText(MainActivity.this, "选择的城市为：" + cities[which], Toast.LENGTH_SHORT).show();
            }
        });
        builder.show();
    }