调用 setChannel 来设置渠道名
- 热力引擎SDK提供了专门设置渠道名称的接口，开发者可以通过此接口设置自己的渠道名称
- setChannel接口推荐在SDK初始化之前调用，可以给所有上报事件都标记上自己设置的渠道名
- 如果开发者未传入渠道名或传入渠道名为null，则默认由SDK自己采集，可能为null
方法示例
public static void setChannel(string channel)
参数说明
| 参数名称 | 参数含义 | 参数类型 | 是否必传 |
| channel | 渠道名 | string | 是 |
调用示例
SolarEngine.Analytics.setChannel("xiaomi");
注：iOS不支持此方法
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