How to get Internal and External (SD Card) Storage Root Path, App Dir, Available Space in Flutter App

In this example, we are going to show you the easiest way to get internal and external storage path in Flutter app. You will learn to get root path, app file directory, available free space in GB at both internal and external SD card storage in Flutter App. See the exampel below for more details.

First, you need to add path_provider_ex Flutter Package in your project by adding following lines in pubspect.yaml file.

dependencies:
  flutter:
    sdk: flutter
  path_provider_ex: ^1.0.1

Add read / write permissions in your android/app/src/main/AndroidManifest.xml before <application> tag.

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

If you still get the Permission Denied error, add the following line on AndroidManifest.xml file.

<application
      android:requestLegacyExternalStorage="true"

Import path_provider_ex package in your script:

import 'package:path_provider_ex/path_provider_ex.dart';

Get list of Storage avialable in device:

List<StorageInfo> storageInfo = await PathProviderEx.getStorageInfo();

You will get list of Storage Info where storageInfo[0] is for Internal storage and storageInfo[1] is for external SD card. You can check length of storageInfo variable to check if Internal storage or External storage are available. See the example below for more details.

if(storageInfo.length > 0){
    //storageInfo[0] = Internal Storage
    print("Root Dir:" + storageInfo[0].rootDir); //Internal Root Dir
    print("App Files Dir:" + storageInfo[0].appFilesDir); //Internal App Dir
    print("Available Spacke:" + storageInfo[0].availableGB.toString() + "GB"); //avaialble space
}else{
    print("No any internal storage Availalbe.");
}

if(storageInfo.length > 1){
    //storageInfo[1] = SD card
    print("Root Dir:" + storageInfo[1].rootDir); //Internal Root Dir
    print("App Files Dir:" + storageInfo[1].appFilesDir); //Internal App Dir
    print("Available Spacke:" + storageInfo[1].availableGB.toString() + "GB"); //avaialble space
}else{
    print("No any External storage Availalbe.");
}

Read This Also: How to list files/folder from internal or SD card storage in Flutter App

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:path_provider_ex/path_provider_ex.dart';
void main() {
  runApp(
    MaterialApp(
      home: MyApp(),
    )
  );
}

class MyApp extends StatefulWidget{
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  List<StorageInfo> storageInfo = [];

  @override
  void initState() {
    Future.delayed(Duration.zero, () async {
         try {
              storageInfo = await PathProviderEx.getStorageInfo();
              /*
               storageInfo[0] => Internal Storeage
               storageInfo[1] => SD Card Storage
              */ 
              setState(() {}); //update UI
         } on PlatformException {
            print("Error while getting paths.");
         }

    });
    super.initState();
  }
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
          appBar: AppBar(
              title:Text("Get Internal And SD Card Path"),
              backgroundColor: Colors.redAccent,
          ),
          body: Padding( 
             padding: EdgeInsets.all(20),
             child:Column(
              children: <Widget>[
                Text( 'Internal Storage root: ${(storageInfo.length > 0) ? storageInfo[0].rootDir : "unavailable"}\n'),
                Text('Internal Storage appFilesDir:${(storageInfo.length > 0) ? storageInfo[0].appFilesDir : "unavailable"}\n'),
                Text('Internal Storage AvailableGB: ${(storageInfo.length > 0) ? storageInfo[0].availableGB : "unavailable"}\n'),
                Text( 'SD Card root: ${(storageInfo.length > 1) ? storageInfo[1].rootDir : "unavailable"}\n'),
                Text('SD Card appFilesDir: ${(storageInfo.length > 1) ? storageInfo[1].appFilesDir : "unavailable"}\n'),
                Text('SD Card AvailableGB: ${(storageInfo.length > 1) ? storageInfo[1].availableGB : "unavailable"}\n'),
              ]
             )
          )
      );
  }
}