Flutter permission-handler 请求权限

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错误日志：
D/AndroidRuntime( 8448): Shutting down VM
E/AndroidRuntime( 8448): FATAL EXCEPTION: main
E/AndroidRuntime( 8448): Process: com.berkey.berkey, PID: 8448
E/AndroidRuntime( 8448): java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=25, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.berkey.berkey/com.berkey.berkey.MainActivity}: java.lang.IllegalStateException: Reply already submitted
E/AndroidRuntime( 8448): at android.app.ActivityThread.deliverResults(ActivityThread.java:4268)
E/AndroidRuntime( 8448): at android.app.ActivityThread.handleSendResult(ActivityThread.java:4312)
E/AndroidRuntime( 8448): at android.app.ActivityThread.-wrap19(Unknown Source:0)
E/AndroidRuntime( 8448): at android.app.ActivityThreadMethodAndArgsCaller.run(RuntimeInit.java:438)
E/AndroidRuntime( 8448): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
E/AndroidRuntime( 8448): Caused by: java.lang.IllegalStateException: Reply already submitted
E/AndroidRuntime( 8448): at io.flutter.view.FlutterNativeViewIncomingMethodCallHandlerhandlePermissionsRequest(PermissionHandlerPlugin.kt:28)
E/AndroidRuntime( 8448): at com.baseflow.permissionhandler.PermissionHandlerPluginregisterWith$1.onRequestPermissionsResult(PermissionHandlerPlugin.kt:46)
E/AndroidRuntime( 8448): at io.flutter.app.FlutterPluginRegistry.onRequestPermissionsResult(FlutterPluginRegistry.java:191)
E/AndroidRuntime( 8448): at io.flutter.app.FlutterActivityDelegate.onRequestPermissionsResult(FlutterActivityDelegate.java:125)
E/AndroidRuntime( 8448): at io.flutter.app.FlutterActivity.onRequestPermissionsResult(FlutterActivity.java:133)
E/AndroidRuntime( 8448): at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:7429)
E/AndroidRuntime( 8448): at android.app.Activity.dispatchActivityResult(Activity.java:7280)
E/AndroidRuntime( 8448): at android.app.ActivityThread.deliverResults(ActivityThread.java:4264)
E/AndroidRuntime( 8448): ... 9 more
Lost connection to device.

解决方案：