在使用amap_base_map做地圖功能的時候，iOS的沒有問題，Android編譯時報錯，報錯內容

e: /Users/chenhao/flutter/.pub-cache/hosted/pub.flutter-io.cn/amap_base_map-0.4.4+4/android/src/main/kotlin/me/yohom/amapbasemap/map/MapHandlers.kt: (237, 1): Object 'OpenOfflineManager' is not abstract and does not implement abstract member @UiThread public abstract fun onMethodCall(@NonNull p0: MethodCall, @NonNull p1: MethodChannel.Result): Unit defined in me.yohom.amapbasemap.MapMethodHandler
e: /Users/chenhao/flutter/.pub-cache/hosted/pub.flutter-io.cn/amap_base_map-0.4.4+4/android/src/main/kotlin/me/yohom/amapbasemap/map/MapHandlers.kt: (243, 5): 'onMethodCall' overrides nothing
                                                                        
FAILURE: Build failed with an exception.                                
                                                                        
* What went wrong:                                                      
Execution failed for task ':amap_base_map:compileReleaseKotlin'.        
> Compilation error. See log for more details                           
                                                                        
* Try:                                                                  
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
                                                                        
* Get more help at https://help.gradle.org                              
                                                                        
BUILD FAILED in 5s  
 

報錯的大致內容是 在

/Users/chenhao/flutter/.pub-cache/hosted/pub.flutter-io.cn/amap_base_map-0.4.4+4/android/src/main/kotlin/me/yohom/amapbasemap/map/MapHandlers.kt: 

這個路徑下MapHandlers.kt檔案 中(243, 5)這個位置onMethodCall有問題，找到這個位置並定位到onMethodCall 把

 override fun onMethodCall(p0: MethodCall?, p1: MethodChannel.Result?) {
        registrar.activity().startActivity(
                Intent(AMapBaseMapPlugin.registrar.activity(),
                        OfflineMapActivity::class.java)
        )
    }
 

把 ？ 可選項 去掉 在重新編譯即可