update demo

example/android/app/src/main/kotlin/com/jarvan/fluwx_example/MainActivity.kt

 package com.jarvan.fluwx_example
 
+import android.os.Bundle
 import androidx.annotation.NonNull;
 import com.jarvan.fluwx.handlers.FluwxRequestHandler
 import com.jarvan.fluwx.handlers.WXAPiHandler
@@ -10,6 +11,10 @@ import io.flutter.plugins.GeneratedPluginRegistrant
 class MainActivity: FlutterActivity() {
     override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
         GeneratedPluginRegistrant.registerWith(flutterEngine);
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
         //If you didn't configure WxAPI, add the following code
         WXAPiHandler.setupWxApi("wxd930ea5d5a258f4f",this)
         //Get Ext-Info from Intent.