Flutter 与原生交互 - android版
原生与Flutter数据交互，主要就是构建好通道机制
Flutter 与原生交互使用Platform Channel。Flutter定义了三种不同类型的Channel，它们分别是：
BasicMessageChannel：用于传递字符串和半结构化的信息（双向有返回值）。
MethodChannel：用于传递方法调用（method invocation）（双向有返回值）。
EventChannel: 用于数据流（event streams）的通信（仅支持数据单向传递，无返回值）。
三种Channel之间互相独立，各有用途，但它们在设计上却非常相近。每种Channel均有三个重要成员变量：
name: String类型，代表Channel的名字，也是其唯一标识符。
messager：BinaryMessenger类型，代表消息信使，是消息的发送与接收的工具。
codec: MessageCodec类型或MethodCodec类型，代表消息的编解码器。
Flutter 与原生交互使用Platform Channel。Flutter定义了三种不同类型的Channel，它们分别是：
BasicMessageChannel：用于传递字符串和半结构化的信息（双向有返回值）。
MethodChannel：用于传递方法调用（method invocation）（双向有返回值）。
EventChannel: 用于数据流（event streams）的通信（仅支持数据单向传递，无返回值）。
三种Channel之间互相独立，各有用途，但它们在设计上却非常相近。每种Channel均有三个重要成员变量：
name: String类型，代表Channel的名字，也是其唯一标识符。
messager：BinaryMessenger类型，代表消息信使，是消息的发送与接收的工具。
codec: MessageCodec类型或MethodCodec类型，代表消息的编解码器。
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