android add dynamic set channel

android/src/main/java/com/jiguang/jpush/JPushPlugin.java

@@ -99,7 +99,12 @@ public class JPushPlugin implements MethodCallHandler {
         HashMap<String, Object> map = call.arguments();
         boolean debug = (boolean)map.get("debug");
         JPushInterface.setDebugMode(debug);
+
         JPushInterface.init(registrar.context());     		// 初始化 JPush
+        
+        String channel = (String)map.get("channel");
+        JPushInterface.setChannel(registrar.context(), channel);
+
         JPushPlugin.instance.dartIsReady = true;
 
         // try to clean getRid cache

example/lib/main.dart

@@ -36,7 +36,7 @@ final JPush jpush = new JPush();
       appKey: "a1703c14b186a68a66ef86c1",
       channel: "theChannel",
       production: false,
-      // debug: true,
+      debug: true,
       );
     jpush.applyPushAuthority(new NotificationSettingsIOS(
       sound: false,

lib/jpush_flutter.dart

@@ -27,8 +27,8 @@ class JPush {
 
     void setup({
       String appKey,
-      String channel,
       bool production,
+      String channel = '',
       bool debug = false,
       }) {
       _channel.invokeMethod('setup', { 'appKey': appKey, 'channel': channel, 'production': production, 'debug': debug});