hyzp_ybqx-Commit029：标注整个Flutter App的入口过程01-07。找到入口处理结束，正式开始Flutter App的起点MyApp

lib/file_manager/file_manager_init.dart

@@ -2,21 +2,26 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:flutter/material.dart';
-import 'common.dart';
+import 'package:flutter/services.dart';
+import 'package:fluttertoast/fluttertoast.dart';
+import 'package:intl/date_symbol_data_local.dart';
 //import 'file_manager.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:permission_handler/permission_handler.dart';
-import 'package:intl/date_symbol_data_local.dart';
-import 'package:fluttertoast/fluttertoast.dart';
-import 'package:flutter/services.dart';
-import '../main.dart';
 
+import '../main.dart';
+import 'common.dart';
+
+//整个Flutter App的入口02
 checkPermission() {
   WidgetsFlutterBinding.ensureInitialized();
-  initializeDateFormatting("zh_CN", null).then((value) async{
+  initializeDateFormatting("zh_CN", null).then((value) async {
+    //整个Flutter App的入口03
     bool ret = await getPermission();
     if (ret) {
+      //整个Flutter App的入口04
       getSDCardDir().then((value) {
+        //整个Flutter App的入口05
         //runApp(MyApp());
         runApp(MaterialApp(
           //title: '启动图demo',
@@ -25,10 +30,9 @@ checkPermission() {
               brightness: Brightness.light,
               backgroundColor: Colors.white,
               platform: TargetPlatform.android),
-          home: new SplashScreen(),
-          routes: <String, WidgetBuilder>{
-            '/home': (BuildContext context) => MyApp()
-          },
+          home: new SplashScreen(), //整个Flutter App的入口06
+          //整个Flutter App的入口07
+          routes: <String, WidgetBuilder>{'/home': (BuildContext context) => MyApp()},
         ));
       });
     } else {
@@ -38,6 +42,7 @@ checkPermission() {
   });
 }
 
+//整个Flutter App的入口03
 // Permission check，适用于 permission_handler: ^5.x.x
 Future<bool> getPermission() async {
   if (Platform.isAndroid) {
@@ -77,6 +82,7 @@ Future<bool> getPermission() async {
 //   return true;
 // }
 
+//整个Flutter App的入口04
 Future<void> getSDCardDir() async {
   Common().sDCardDir = (await getExternalStorageDirectory()).path;
 }