midButton iOS 正常显示 安卓上无效 图标和文字都不显示

        "color": "#7A7E83",  
        "selectedColor": "#4d8afc",  
        "borderStyle": "white",  
        "backgroundColor": "#ffffff",  

        "midButton": {  
            "height": "70px",  
            "width": "60px",  
            "iconPath": "static/tabbarlogo.png",  
            "iconWidth": "60px",  
            "text": "中间图标"  
        },  
        "list": [{  
            "pagePath": "pages/messageFile/sessionVc/sessionVc",  
            "iconPath": "static/txiaoxiN.png",  
            "selectedIconPath": "static/txiaoxiS.png",  
            "text": "消息"  
        }, {  
            "pagePath": "pages/contactsFile/contactsVc/contactsVc",  
            "iconPath": "static/select_no_tongxunlu.png",  
            "selectedIconPath": "static/select_y_tongxunlu.png",  
            "text": "通讯录"  
        }, {  
            "pagePath": "pages/workFile/workVc/workVc",  
            "iconPath": "static/tgongzuotaiN.png",  
            "selectedIconPath": "static/tgongzuotaiS.png",  
            "text": "工作台"  
        }, {  
            "pagePath": "pages/myFile/myVc/myVc",  
            "iconPath": "static/twodeN.png",  
            "selectedIconPath": "static/twode.png",  
            "text": "我的"  
        }]  
    },```  

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