File object can't find the file when there is one [android help]

File object can't find the file when there is one

In my app After user clicks on a button ,the download manager starts to download a file from internet and saving it to the internal sd card using this code:

void startDownload()
    {
        Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).mkdirs();        
        download_req.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE)
        .setAllowedOverRoaming(false)
        .setTitle(PersianReshape.reshape("Downloading"))
        .setDescription(PersianReshape.reshape("currently downloading the file..."))
        .setDestinationInExternalPublicDir(Environment.getExternalStorageDirectory().getAbsolutePath() , packageId + ".sqlite");
        download_ID = mgr.enqueue(download_req);
    }

After it is downloaded, I plan to check its existance everytime app runs with this code:

String DatabaseAddress =
Environment.getExternalStorageDirectory().getAbsolutePath() +
"/ee.sqlite";
File file = new File(DatabaseAddress);
Log.d("PATH File: ", DatabaseAddress);
if (file.exists()){
Toast.makeText(getApplicationContext(), "found", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(getApplicationContext(), "not found", Toast.LENGTH_SHORT).show();
}

Now when I run this code it returns "not found" message whereas the file is already there (I checked its existance using a file manager).

the device I test on is nexus 7 and path used in saving the download file is: /storage/emulated/0/ee.sqlite

ee.sqlite is the filename of downloaded file.

/storage/emulated/0/ is the default path returned by app

Permissions added to manifest for this code are:

Q: Why does file.exists() returns false when there is a file?

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