Gets the CameraManager singleton instance. @return A reference to the CameraManager singleton.

获取一般请求的服务实例 @param clazz 模块服务对应的实例类型 @param <T> 泛型 @return 指定的服务类型的实例

get private filed in this specific object @param targetClass @param instance the filed owner @param fieldName @param <T> @return field if success,

支付宝本地签名 @param subject 商品名称 @param body 商品描述 @param price 价格 @param tradeNo 商户订单号，该值在商户端应保持唯一（可自定义格式规范）, 为空则自动生成 @return signUrl

开启推送 @param context

set all item large and small TextView size Each item has tow label, one is large, another is small. Small one will be shown when item state is normal

get private mButton in mMenuView at position @param position @return

change the field value @param targetClass @param instance the filed owner @param fieldName @param value

dp to px @param context @param dpValue dp @return px

get private mMenuView @return

Encodes hex octects into Base64 @param binaryData Array containing binaryData @return Encoded Base64 array

get private mButtons in mMenuView @return

return item count @return

登录 @param key 登录方式(tel/email) @param value 手机号 @param pwd 密码 @return

设置清空按钮文案 @param resId 资源文件id @return 链式调用