Android:PopupMenu显示item中的android:icon

最近在学习过程中，想实现一个PopupMenu，但是item中的android:icon设置项完全没反应，所以得自己编写代码实现，经过查找资料和尝试，以下代码完美实现PopupMenu显示item中的android:icon，效果图如下：
Android:PopupMenu显示item中的android:icon_第1张图片
menu包中的main.xml文件内容如下：

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android">    <item        android:id="@+id/item_add"        android:icon="@drawable/addbutton"        android:title="@string/add"/>    <item        android:id="@+id/item_delete"        android:icon="@drawable/delete"        android:title="@string/delete"/>menu>

MainActivity.java文件中相关的内容如下：

btn_optins= (Button) findViewById(R.id.btn_option);PopupMenu popupMenu=null;btn_optins.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                popupMenu=new PopupMenu(MainActivity.this,v);                getMenuInflater().inflate(R.menu.main,popupMenu.getMenu());                popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {                    @Override                    public boolean onMenuItemClick(MenuItem item) {                        switch (item.getItemId()){                            case R.id.item_add:                                Intent intent = new Intent(MainActivity.this, SearchActivity.class);                                startActivity(intent);                                finish();                                break;                            case R.id.item_delete:                                if(!dataList.isEmpty()){                                    lv_city.setOnItemClickListener(new AdapterView.OnItemClickListener() {                                        @Override                                        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                                            String name=dataList.get(position).toString();                                            dataList.remove(position);                                            cityDB.removeCity(name);                                            adapter.notifyDataSetChanged();                                            //刷新当前界面                                            Intent intent1 = new Intent(MainActivity.this, MainActivity.class);                                            startActivity(intent1);                                            finish();                                        }                                    });                                }else {                                    Toast.makeText(MainActivity.this,"当前城市列表为空！请添加城市！",Toast.LENGTH_SHORT).show();                                }                                break;                        }                        return true;                    }                });                //使用反射，强制显示菜单图标                try {                    Field field = popupMenu.getClass().getDeclaredField("mPopup");                    field.setAccessible(true);                    MenuPopupHelper mHelper = (MenuPopupHelper) field.get(popupMenu);                    mHelper.setForceShowIcon(true);                } catch (IllegalAccessException e) {                    e.printStackTrace();                } catch (NoSuchFieldException e) {                    e.printStackTrace();                }                popupMenu.show();            }        });

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