修改了唤醒识别初始化部分，可以唤醒识别，但还存在问题；增加了合成

lib/iflytek_speech_demo.dart

@@ -43,22 +43,45 @@ class IflytekSpeechDemo {
     }
   }
 
-  Future<String> start(EventHandler onReceiveSpeechText) async {
+  Future<String> wakeupStart(EventHandler onReceiveSpeechText) async {
     _onReceiveSpeechText = onReceiveSpeechText;
     try{
-      return await _channel.invokeMethod('start');
+      return await _channel.invokeMethod('wakeupStart');
     }catch(e) {
       print(e);
       return "9999999";
     }
   }
 
-  Future<String> stop() async {
-    return await _channel.invokeMethod('stop');
+  Future<String> wakeupStop() async {
+    return await _channel.invokeMethod('wakeupStop');
   }
 
-  Future<String> cancel() async {
-    return await _channel.invokeMethod('cancel');
+  Future<String> wakeupCancel() async {
+    return await _channel.invokeMethod('wakeupCancel');
+  }
+
+  Future<int> ttsStart(String ttsText) async {
+    try{
+      int ret = await _channel.invokeMethod('ttsStart', {
+        "ttsText": ttsText
+      });
+      return ret;
+    }catch(e) {
+      print(e);
+      return 9999999;
+    }
+  }
+  Future<String> ttsCancel() async {
+    return await _channel.invokeMethod('ttsCancel');
+  }
+
+  Future<String> ttsPause() async {
+    return await _channel.invokeMethod('ttsPause');
+  }
+
+  Future<String> ttsResume() async {
+    return await _channel.invokeMethod('ttsResume');
   }
 
 }