Check If File Exists Before downloading the file

Question

I am using download manager to download the file. The code for downloading the file is as follow.

   private String DownloadData(Uri uri, View v, String textview) {

    long downloadReference;

    // Create request for android download manager
    dm = (DownloadManager)getContext().getSystemService(DOWNLOAD_SERVICE);
    DownloadManager.Request request = new DownloadManager.Request(uri);

    //Setting title of request
    request.setTitle(textview);

    //Setting description of request
    request.setDescription("Android Data download using DownloadManager.");

    //Set the local destination for the downloaded file to a path within the application's external files directory
    request.setDestinationInExternalFilesDir(getContext(), DIRECTORY_DOWNLOADS, File.separator + "Dr_Israr_Ahmad" + File.separator + textview+".mp3");

    //Enqueue download and save into referenceId
    downloadReference = dm.enqueue(request);

    return null
}

The above code works fine. What i need to do now is if the file is already downloaded than i want my app to play it. The code which is used is

   String path = String.valueOf(getContext().getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS+ File.separator+"Dr_Israr_Ahmad" + File.separator +filename+".mp3"));

                File file = new File(path);

                if(file.exists()){
                    Toast.makeText(getContext(),path+ "/n exists", Toast.LENGTH_SHORT).show();
                } else if (!file.exists()) {
                    Toast.makeText(getContext(), "Downloading", Toast.LENGTH_SHORT).show();
                   Uri uri = Uri.parse("http://www.digitalsguide.com/mobile-apps/dr-israr-ahmad/audios/"+filename+".mp3");
                   String filepath = DownloadData(uri,view,filename);
                }

but the problem is the condition is true even if the file doesn't exist. Is there a problem in my path ? kindly help me out,

jeprubio · Accepted Answer · 2019-07-06T21:17:03.583

12

I detected some strange behavior with exists time ago and changed it to isFile:

File file = new File(path);
if (file.isFile()) {
    Toast.makeText(getContext(), path + "/n exists", Toast.LENGTH_SHORT).show();
} else {
    Toast.makeText(getContext(), "Downloading", Toast.LENGTH_SHORT).show();
    // ...
}

I think the mobile, somehow, created a directory every time new File() was executed. Check this.

edited Jul 06 '19 at 21:17

answered Jan 11 '18 at 22:36

jeprubio

17,312
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this solution is to check if the file exist locally but what if you need to check if the file exist remotely? – CanCoder Oct 11 '19 at 22:56
1

@leeCoder - Then you ask a new question, or search for an existing one that answers it. Because that isn't what >this< question is about ... – Stephen C Aug 27 '21 at 02:20

score 1 · Answer 2 · answered Nov 23 '21 at 10:06

1

Because getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS) returns /storage/emulated/0/Android/data/<PACKAGE_ID>/files/Download. It's not the folder where DownloadManager downloads files when we set Environment.DIRECTORY_DOWNLOADS.

answered Nov 23 '21 at 10:06

Sergey Kudryashov

21
3

score 0 · Answer 3 · edited Jan 03 '22 at 05:22

0

Try to put your path like the example shown below:

File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)+ "/" +filename);

Here filename is example.pdf you can then check if file exists or not

edited Jan 03 '22 at 05:22

Ramil Aliyev 007

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answered Jan 02 '22 at 19:50

anonymous

11
2

score -1 · Answer 4 · edited Jan 21 '20 at 08:15

-1

.getExternalFilesDir(yourFilePath) creates a directory in your code. so use it like this.

String path = String.valueOf(getContext().getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)+ File.separator+"Dr_Israr_Ahmad" + File.separator +filename+".mp3");

edited Jan 21 '20 at 08:15

Ankush Bist

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answered Jan 21 '20 at 07:00

Manuavin

11

This doesn't answer the question asked. – Stephen C Aug 27 '21 at 02:22

Check If File Exists Before downloading the file

4 Answers4