android点击按钮弹出复选框

String[] items={"餐饮","出行","娱乐","学习","日用品","其他"};
String consumetype="";

List<String> mytypes = new ArrayList<>();

AlertDialog.Builder builder = new AlertDialog.Builder(addmess.this);
builder.setTitle("请选择消费类型：");
builder.setMultiChoiceItems(items, null, new DialogInterface.OnMultiChoiceClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
        mytypes.clear();
        if (isChecked) {
            mytypes.add(items[which]);
        } else {
            mytypes.remove(items[which]);
        }
    }
});

builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        consumetype="";
        for (String color : mytypes) {
            consumetype+= color + "、";
        }
        Toast.makeText(getApplicationContext(), "你选择了: " + consumetype, Toast.LENGTH_SHORT).show();
        dialog.dismiss();
    }
});

builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        mytypes.clear();
        dialog.dismiss();
    }
});
AlertDialog dialog = builder.create();      //创建AlertDialog对象
dialog.show();                               //显示对话框              //显示对话框