How to know whether a file exists or not in internal/external storage in android?

Question

I think this question may be a duplicate but I didn't find any other answers for this.

My question is:

Is it possible to know whether a file (e.g.: a .txt/.doc/.csv file) exists or not in any location (i.e. internal/external storage) in the device?

Possible duplicate of [Android; Check if file exists without creating a new one](http://stackoverflow.com/questions/16237950/android-check-if-file-exists-without-creating-a-new-one) — Nabeel K, Mar 01 '16 at 12:58
http://stackoverflow.com/questions/1816673/how-do-i-check-if-a-file-exists-in-java — Alex Chengalan, Mar 01 '16 at 12:58
i tried Environment.getExternalStorageDirectory() and Environment.getDataDirectory() both to search but these two are not searching in internal storage(Built-in Storage). — syam vakkalanka, Mar 01 '16 at 13:01
thats an example actually my problem is i don't know where the file is located/path. here i know just file name itself(ex: MyTest.txt) not path. — syam vakkalanka, Mar 01 '16 at 13:13
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/105011/discussion-between-nils-patel-and-syam-vakkalanka). — Nils, Mar 01 '16 at 13:14

score 0 · Answer 1 · edited Mar 02 '16 at 08:41

0

If you already know the path of the file you can use the following code:

File yourFile = new File(yourFilePath);
yourFile.exists();

edited Mar 02 '16 at 08:41

user2340612

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answered Mar 01 '16 at 12:59

Niza Siwale

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score 0 · Answer 2 · edited Mar 02 '16 at 02:03

0

Hope it works in your case.

File file = new File(Environment.getExternalStorageDirectory() + File.separator + "filename with extention");
File file2 = new File("internal sotrage path here" + File.separator + "filename with extention");
try {
    if(file.exists()){
        // code if file exist in external storage
    }
    else if(file2.exists()){
        // code if file exist in internal storage
    }
    else {
        // file not found
    }
} catch (IOException e) {
    e.printStackTrace();
}

edited Mar 02 '16 at 02:03

Pang

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answered Mar 01 '16 at 13:02

Khizar Hayat

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thanks for reply but here my problem is i'm failed to get Internal storage path. – syam vakkalanka Mar 01 '16 at 13:05
actually i'm new to android don't know how to get internal storage folders. if you have idea please support me with some snippet of code.. – syam vakkalanka Mar 01 '16 at 13:07
try Environment.getDataDirectory() – Khizar Hayat Mar 01 '16 at 13:10

score 0 · Answer 3 · answered Apr 26 '23 at 09:27

 Future<String?> _saveFileToDevice(String filename, List<int> data) async {
// Get the path to the app's documents directory
var status = await Permission.storage.status;
if (!status.isGranted) {
  await Permission.storage.request();
}

var dir = Platform.isAndroid
    ? '/storage/emulated/0/Download'
    : (await getApplicationDocumentsDirectory()).path;

// Create the file and write the data to it
var file = File('$dir/$filename');

bool alreadyDownloaded = await file.exists();

String incrementCount(String fileName) {
  int dotIndex = fileName.lastIndexOf('.');
  String newFileName = fileName.substring(0, dotIndex) +
      "(${count += 1})" +
      fileName.substring(dotIndex);

  return newFileName;
}

if (alreadyDownloaded) {
  String newFileName = incrementCount(file.path);

  var newFile = File('$newFileName');
  await newFile.writeAsBytes(data, flush: true);

  String subStringFileName = newFileName.substring(29);
  CommonWidgets.makeToast(
      fontSize: 14,
      toastMsg: '${subStringFileName} saved to Downloads Folder');

  file = newFile;
  print('modified updating ....--> $file');
} else {
  await file.writeAsBytes(data, flush: true);

  CommonWidgets.makeToast(
      fontSize: 14,
      toastMsg: '${filename} saved to Downloads Folder');
}

return 'file://${file.path}';
}

Data is Uint8List Bytes which can convert the file into bytes and pass the byteslist

How to know whether a file exists or not in internal/external storage in android?

3 Answers3