Develop Reference

Check If File Exists Before downloading the file

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,

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.

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.

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

.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");

java.lang.IllegalStateException: Failed to get external storage files directory Android

I want to download file to public dir, it works well when sdcard is avaialble but gives me above error when sdcard is not avaiable. I do checking of sdcard.
I want to save files to DIRECTORY_MUSIC which is public by default. But the line request.setDestinationInExternalFilesDir() gives me above error.
Here is the code so far I have written
File dir = new File(Environment
.DIRECTORY_MUSIC + "/" + DIR_NAME + "/");
if (!dir.exists()) {
// create dir for first time
Log.d(LOG_TAG, "first time created dir");
dir.mkdir();
}
DownloadManager dm = (DownloadManager) v.getContext().getSystemService(Context.DOWNLOAD_SERVICE);
Uri songLink = Uri.parse(streamUrl);
DownloadManager.Request request = new DownloadManager.Request(songLink);
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE)
.setAllowedOverRoaming(false)
.setTitle(title)
.setMimeType("audio/mp3")
.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
.setDestinationInExternalFilesDir(v.getContext(), dir.getAbsolutePath(),
File.separator + DIR_NAME + File.separator + title);
dm.enqueue(request);
What changes should I do to save file in that dir
I want to save music file which I am downloading from an url and saving to public music directory so that music player will find that file
My question is how Whatsapp make WhatsApp audio folder and download the whatsapp audios to that dir. For phones with SD card I can do this but I fail when there's no SD card in phone. How it is done ?

To save download file in public directory:
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_MUSIC, filename);
This method throws:
Throws
IllegalStateException
If the external storage directory cannot be found or create
So you must check if external storage is writable before use.
public boolean isExternalStorageWritable() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
return true;
}
return false;
}
Also requires permission:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
More info

unable to give a path to DownloadManager

i would download with DownloadManager a file in a specific directory. At the beginning of my app, i create (if doesn't exist) a folder:
if (storageState.equals(Environment.MEDIA_MOUNTED)) {
externalStorageWriteable = true;
directory_path = Environment.getExternalStorageDirectory()
+ "/" + context.getResources().getString(R.string.app_name);
directory = new File(directory_path);
if (!directory.exists()) {
directory.mkdirs();
}
}
if i check with a filemanager, folder it's available at /sdcard/folderName but if i print on logcat directory_path variable, i obtain
/storage/emulated/0/folderName
I try to download file by passing destination folder like
Uri destination = Uri.fromFile(new File(directory_path));
request.setDestinationUri(destination);
//request is of type DownloadManager.Request
but when i check where file it's stored, my folder is empty and downloaded file is stored inside /sdcard/Download
Could someone tell me why and how can i solve this issue?

Add .toString()
Environment.getExternalStorageDirectory().toString()

File being downloaded is saved inside data folder

I am using download manager to download MP3 Files from my server.
Here is the code for it.
public String createFilePath()
{
String path;
String dir = "APP_NAME";
path = Environment.getExternalStorageDirectory().getPath();
File file = new File(Environment.getExternalStorageDirectory(),dir);
if(!file.exists())
{
file.mkdir();
}
path += "/" +dir + "/";
System.out.println("-- saving path : " + path);
return path;
}
public void startDownload() {
Uri uri=Uri.parse(URLFixer.Fix(DATA.url));
System.out.println("-- download path : " + createFilePath() + FileNameGetter.getFileName(DATA..url));
DownloadManager.Request request = new Request(uri);
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI |DownloadManager.Request.NETWORK_MOBILE);
request.setAllowedOverRoaming(false);
request.setTitle(DATA..title);
request.setDescription(DATA.artist + " - " + DATA.album);
request.setDestinationInExternalFilesDir(activity, createFilePath(), FileNameGetter.getFileName(DATA..url));
// request.setNotificationVisibility(Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.HONEYCOMB) {
// request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
request.setNotificationVisibility(Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
}
lastDownload= mgr.enqueue(request);
isDownloading = true;
Toasts.pop(activity, "Download Started!!");
// v.setEnabled(false);
// findViewById(R.id.query).setEnabled(true);
}
The problem is that it should be saved on SD Card inside folder "APP_NAME", but once the audio is downloaded, I cant see it inside that folder, and when I play the audio, and check its info, it shows path like thie
/sdcard/Android/data/com.X.app/files/mnt/sdcard/APP_NAME/file.mp3
As its being saved inside data folder, user is not able to see the file. How to fix it to move it to main SD Card i.e. /mnt/sdcard/APP_NAME so that user can see it.

DownloadManager.Request.setDestinationUri(Uri uri) should fit your requirement, remember to call allowScanningByMediaScanner() if you want the MP3 to be scanned by MediaScanner.

Set custom folder Android Download Manager

I've a question about Download Manager.
I'm going to download a file from a site. When I set the default directory for download (Environment.DIRECTORY_DOWNLOAD) all works fine and my download is started. But if I try to change the directory, my app doesn't download the file. In particular, I want my file to go into a folder inside a Download, for example /storage/sdcard/Download/myFolder. How can I fix that?
File mydownload = new File (Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)+ "/myFolder");
if (!mydownload.exists()){
mydownload.mkdir();
}
String url = sUrl[0];
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
}
request.setDestinationInExternalPublicDir(mydownload.getAbsolutePath(),"Myfile.extension");
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);

check below code: its save file in "sdcard/dhaval_files/". just replace your folder name and give permission write_external_storage in android manifest file.
public void file_download(String uRl) {
File direct = new File(Environment.getExternalStorageDirectory()
+ "/dhaval_files");
if (!direct.exists()) {
direct.mkdirs();
}
DownloadManager mgr = (DownloadManager) this.getSystemService(Context.DOWNLOAD_SERVICE);
Uri downloadUri = Uri.parse(uRl);
DownloadManager.Request request = new DownloadManager.Request(
downloadUri);
request.setAllowedNetworkTypes(
DownloadManager.Request.NETWORK_WIFI
| DownloadManager.Request.NETWORK_MOBILE)
.setAllowedOverRoaming(false).setTitle("Demo")
.setDescription("Something useful. No, really.")
.setDestinationInExternalPublicDir("/dhaval_files", "test.jpg");
mgr.enqueue(request);
}

There are two options available for you to use.
1) first setDestinationInExternalPublicDir this will let you download in any of the androids standard download folder based on media type eg DIRECTORY_DOWNLOADS, DIRECTORY_MUSIC. these files will remain after uninstall.
request.setDestinationInExternalPublicDir(DIRECTORY_DOWNLOADS,
File.separator + folderName + File.separator + fileName);
The first argument should be a standard downloads directory for this to work properly and cannot be anything else.
2) second is setDestinationInExternalFilesDir this is same as the previous method with the difference that these files will be deleted after app uninstall.
request.setDestinationInExternalFilesDir(context, DIRECTORY_DOWNLOADS,
File.separator + folderName + File.separator + fileName);
here the second argument can be null or any of the android download directories.

Try Below Code:.
String storagePath = Environment.getExternalStorageDirectory()
.getPath()
+ "/Directory_name/";
//Log.d("Strorgae in view",""+storagePath);
File f = new File(storagePath);
if (!f.exists()) {
f.mkdirs();
}
//storagePath.mkdirs();
String pathname = f.toString();
if (!f.exists()) {
f.mkdirs();
}
// Log.d("Storage ",""+pathname);
dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
Uri uri = Uri.parse(image);
checkImage(uri.getLastPathSegment());
if (!downloaded) {
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir("/Directory_name", uri.getLastPathSegment());
Long referese = dm.enqueue(request);
Toast.makeText(getApplicationContext(), "Downloading...", Toast.LENGTH_SHORT).show();
}

For Set Your Path For Download File Use: Work For me (Android 11).
File file = new File(Environment.getExternalStorageDirectory().getPath() + "/YOUR FOLDER/", "YOUR FILE.(mp3|mp4|pdf|...)");
request.setDestinationUri(Uri.fromFile(file));
Complete Code:
First Check Directory
private boolean CreateDirectory() {
boolean ret = false;
File filepath = Environment.getExternalStorageDirectory();
File dir = new File(filepath.getPath() + "/YOUR FOLDER/");
if (!dir.exists()) {
try {
dir.mkdirs();
ret = true;
} catch (Exception e) {
ret = false;
e.printStackTrace();
}
}
return ret;
}
Then:
String URL = " YOUR URL ";
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(URL));
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
request.setTitle("YOUR TITLE");
request.setDescription("YOUR DESCRIPTION");
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
File file = new File(Environment.getExternalStorageDirectory().getPath() + "/YOUR FOLDER/", "YOUR FILE.(mp3|mp4|pdf|...)");
request.setDestinationUri(Uri.fromFile(file));
DownloadManager manager= (DownloadManager)
getSystemService(Context.DOWNLOAD_SERVICE);
Long downloadId= manager.enqueue(request);
ok,Finish