Develop Reference

How to save a file (image) in Android and support API levels from 21 to 29?

All new apps uploaded to Google Play must target Android 10 (API level 29) or higher. However, when app targets API level 29, the path returned from Environment.getExternalStorageDirectory() is no longer directly accessible to apps.
Documentation suggests using Context.getExternalFilesDir() (not suitable for my use case as the files placed there are internal to the app and are deleted when the app is uninstalled) or MediaStore, which is documented here.
I got stuck at the following snippet:
// Find all image files on the primary external storage device.
// On API <= 28, use VOLUME_EXTERNAL instead.
Uri collection = MediaStore.Images.Media.getContentUri(
MediaStore.VOLUME_EXTERNAL_PRIMARY);
As I am trying to support both API <= 28 and API >= 29 I have tried the following:
Uri collection;
if (VERSION.SDK_INT >= VERSION_CODES.Q) {
collection = MediaStore.Images.Media.getContentUri(
MediaStore.VOLUME_EXTERNAL_PRIMARY);
} else {
collection = MediaStore.Images.Media.getContentUri(
MediaStore.VOLUME_EXTERNAL);
}
However, I am still getting a warning that MediaStore.VOLUME_EXTERNAL requires API level 29.
Also, following the same documentation, I am trying to set MediaColumns.RELATIVE_PATH to provide the system a hint for where to store the newly-written files. The code snippet follows:
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DISPLAY_NAME, file.getFilename());
values.put(MediaStore.Images.Media.RELATIVE_PATH, "My_image_app_folder");
Uri uri = resolver.insert(collection, values);
The same problem here, the field requires API level 29.
To sum it up, how to store a file (image) and support API levels from 21 to 29?

Maybe this code can help you :
My pictures are storage in my assets folder, I don't know if it's a problem for you.
At the end, the pictures a stored in the folder "Pictures" of android and are recognized by the gallery.
AssetManager assetManager = Objects.requireNonNull(requireContext()).getAssets();
Context myContext = requireContext();
//Essential for creating the external storage directory for the first launch
myContext.getExternalFilesDir(null);
File photosFolder;
if (Build.VERSION_CODES.R > Build.VERSION.SDK_INT) {
photosFolder = new File(Environment.getExternalStorageDirectory(), "Pictures");
} else {
photosFolder = new File(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_PICTURES);
}
if (!photosFolder.exists()) {
photosFolder.mkdir();
}
try {
pictures = assetManager.list("photos/dataset1");
} catch (IOException e) {
Log.e("tag", "Failed to get asset file list.", e);
}
if (pictures != null) {
for (String filename : pictures) {
InputStream in;
OutputStream out;
try {
in = assetManager.open("photos/dataset1/" + filename);
File outFile = new File(photosFolder, filename);
out = new FileOutputStream(outFile);
copyFile(in, out);
in.close();
out.flush();
out.close();
MediaScannerConnection.scanFile(requireContext(), new String[]{outFile.toString()}, null, new MediaScannerConnection.OnScanCompletedListener() {
#Override
public void onScanCompleted(String path, Uri uri) {
Log.i("External Storage", "Scanned" + path + ":");
Log.i("External Storage", "uri " + uri);
}
});
} catch (IOException e) {
Log.e("tag", "Failed to copy asset file: " + filename, e);
}
}
} else {
Log.e("Error NPE", "la variable pictures est null");
}

Delete cache files for a specific application [duplicate]

I am creating a file to send as an attachment to an email. Now I want to delete the image after sending the email. Is there a way to delete the file?
I have tried myFile.delete(); but it didn't delete the file.
I'm using this code for Android, so the programming language is Java using the usual Android ways to access the SD card. I am deleting the file in the onActivityResult method, when an Intent is returned to the screen after sending an email.

File file = new File(selectedFilePath);
boolean deleted = file.delete();
where selectedFilePath is the path of the file you want to delete - for example:
/sdcard/YourCustomDirectory/ExampleFile.mp3

Also you have to give permission if you are using >1.6 SDK
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
in AndroidManifest.xml file

Change for Android 4.4+
Apps are not allowed to write (delete, modify ...) to external storage except to their package-specific directories.
As Android documentation states:
"Apps must not be allowed to write to secondary external storage
devices, except in their package-specific directories as allowed by
synthesized permissions."
However nasty workaround exists (see code below). Tested on Samsung Galaxy S4, but this fix does't work on all devices. Also I wouldn’t count on this workaround being available in future versions of Android.
There is a great article explaining (4.4+) external storage permissions change.
You can read more about workaround here.
Workaround source code is from this site.
public class MediaFileFunctions
{
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static boolean deleteViaContentProvider(Context context, String fullname)
{
Uri uri=getFileUri(context,fullname);
if (uri==null)
{
return false;
}
try
{
ContentResolver resolver=context.getContentResolver();
// change type to image, otherwise nothing will be deleted
ContentValues contentValues = new ContentValues();
int media_type = 1;
contentValues.put("media_type", media_type);
resolver.update(uri, contentValues, null, null);
return resolver.delete(uri, null, null) > 0;
}
catch (Throwable e)
{
return false;
}
}
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
private static Uri getFileUri(Context context, String fullname)
{
// Note: check outside this class whether the OS version is >= 11
Uri uri = null;
Cursor cursor = null;
ContentResolver contentResolver = null;
try
{
contentResolver=context.getContentResolver();
if (contentResolver == null)
return null;
uri=MediaStore.Files.getContentUri("external");
String[] projection = new String[2];
projection[0] = "_id";
projection[1] = "_data";
String selection = "_data = ? "; // this avoids SQL injection
String[] selectionParams = new String[1];
selectionParams[0] = fullname;
String sortOrder = "_id";
cursor=contentResolver.query(uri, projection, selection, selectionParams, sortOrder);
if (cursor!=null)
{
try
{
if (cursor.getCount() > 0) // file present!
{
cursor.moveToFirst();
int dataColumn=cursor.getColumnIndex("_data");
String s = cursor.getString(dataColumn);
if (!s.equals(fullname))
return null;
int idColumn = cursor.getColumnIndex("_id");
long id = cursor.getLong(idColumn);
uri= MediaStore.Files.getContentUri("external",id);
}
else // file isn't in the media database!
{
ContentValues contentValues=new ContentValues();
contentValues.put("_data",fullname);
uri = MediaStore.Files.getContentUri("external");
uri = contentResolver.insert(uri,contentValues);
}
}
catch (Throwable e)
{
uri = null;
}
finally
{
cursor.close();
}
}
}
catch (Throwable e)
{
uri=null;
}
return uri;
}
}

Android Context has the following method:
public abstract boolean deleteFile (String name)
I believe this will do what you want with the right App premissions as listed above.

Recursively delete all children of the file ...
public static void DeleteRecursive(File fileOrDirectory) {
if (fileOrDirectory.isDirectory()) {
for (File child : fileOrDirectory.listFiles()) {
DeleteRecursive(child);
}
}
fileOrDirectory.delete();
}

This works for me: (Delete image from Gallery)
File file = new File(photoPath);
file.delete();
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(new File(photoPath))));

public static boolean deleteDirectory(File path) {
// TODO Auto-generated method stub
if( path.exists() ) {
File[] files = path.listFiles();
for(int i=0; i<files.length; i++) {
if(files[i].isDirectory()) {
deleteDirectory(files[i]);
}
else {
files[i].delete();
}
}
}
return(path.delete());
}
This Code will Help you.. And In Android Manifest You have to get Permission to make modification..
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Try this.
File file = new File(FilePath);
FileUtils.deleteDirectory(file);
from Apache Commons

Sorry: There is a mistake in my code before because of the site validation.
String myFile = "/Name Folder/File.jpg";
String myPath = Environment.getExternalStorageDirectory()+myFile;
File f = new File(myPath);
Boolean deleted = f.delete();
I think is clear...
First you must to know your file location.
Second,,, Environment.getExternalStorageDirectory() is a method who gets your app directory.
Lastly the class File who handle your file...

I had a similar issue with an application running on 4.4. What I did was sort of a hack.
I renamed the files and ignored them in my application.
ie.
File sdcard = Environment.getExternalStorageDirectory();
File from = new File(sdcard,"/ecatAgent/"+fileV);
File to = new File(sdcard,"/ecatAgent/"+"Delete");
from.renameTo(to);

This worked for me.
String myFile = "/Name Folder/File.jpg";
String my_Path = Environment.getExternalStorageDirectory()+myFile;
File f = new File(my_Path);
Boolean deleted = f.delete();

private boolean deleteFromExternalStorage(File file) {
String fileName = "/Music/";
String myPath= Environment.getExternalStorageDirectory().getAbsolutePath() + fileName;
file = new File(myPath);
System.out.println("fullPath - " + myPath);
if (file.exists() && file.canRead()) {
System.out.println(" Test - ");
file.delete();
return false; // File exists
}
System.out.println(" Test2 - ");
return true; // File not exists
}

You can delete a file as follow:
File file = new File("your sdcard path is here which you want to delete");
file.delete();
if (file.exists()){
file.getCanonicalFile().delete();
if (file.exists()){
deleteFile(file.getName());
}
}

File filedel = new File("/storage/sdcard0/Baahubali.mp3");
boolean deleted1 = filedel.delete();
Or, Try This:
String del="/storage/sdcard0/Baahubali.mp3";
File filedel2 = new File(del);
boolean deleted1 = filedel2.delete();

Android app - how to write to Android device's Documents folder?

I want to create a XML file inside my Android app.
This file I want to write into the documents folder of my Android device.
Later I want to connect my Android device to my PC using USB and read that XML file out of the documents folder.
My Device is an Android Galaxy Tab Pro 10.1, Android 4.4.2.
I tried already:
String fileName = "example.xml";
String myDirectory = "myDirectory";
String externalStorage = Environment.getExternalStorageDirectory().getAbsolutePath();
File outputFile = new File(externalStorage + File.separator + myDirectory + File.separator + fileName);
But no file is created. I also want later to read that file out of the documents folder into may app again.
Any help is appreciated, thanks!

I know this is late, but you can get the documents directory like this:
File dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS);
File file = new File(dir, "example.txt");
//Write to file
try (FileWriter fileWriter = new FileWriter(file)) {
fileWriter.append("Writing to file!");
} catch (IOException e) {
//Handle exception
}

Set permission in Android Manifest
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Use this code to write to external directory
String fileName = "example.xml";
String dirName = "MyDirectory";
String contentToWrite = "Your Content Goes Here";
File myDir = new File("sdcard", dirName);
/*if directory doesn't exist, create it*/
if(!myDir.exists())
myDir.mkdirs();
File myFile = new File(myDir, fileName);
/*Write to file*/
try {
FileWriter fileWriter = new FileWriter(myFile);
fileWriter.append(contentToWrite);
fileWriter.flush();
fileWriter.close();
}
catch(IOException e){
e.printStackTrace();
}

Before creating file you have to create directory in which you are saving the file.
Try like this one:-
String fileName = "example.xml";
String myDirectory = "myDirectory";
String externalStorage = Environment.getExternalStorageDirectory().getAbsolutePath();
File outputDirectory = new File(externalStorage + File.separator + myDirectory );
if(!outputDirectory.exist()){
outputDirectory.mkDir();
}
File outputFile = new File(externalStorage + File.separator + myDirectory + File.separator + fileName);
outputFile.createFile();

Try restarting you device and then check if the file exists. If so, you are creating it (which it looks like you should be based on your code) but it is not showing up until the media is scanned on your device. Try implementing MediaScannerConnectionClient so it will show become visible after creation.
public class MainActivity extends Activity implements MediaScannerConnectionClient {
private MediaScannerConnection msConn;
private File example;
...
#Override
protected void onCreate(Bundle savedInstanceState) {
...
msConn = new MediaScannerConnection(this.getApplicationContext(), this);
String dir = Environment.getExternalStorageDirectory() + "/Documents/";
example = new File(dir, "example.xml");
msConn.connect();
}
#Override
public void onMediaScannerConnected() {
msConn.scanFile(example.getAbsolutePath(), null);
}
#Override
public void onScanCompleted(String path, Uri uri) {
msConn.disconnect();
}

From Android 10 onwards, Android started using Scoped Storage model to protect user privacy.
If you want to share this file with the User, then you should write this file in Shared Storage. To write a file in Shared Storage, this has to be done in 3 steps:-
Step 1: Launch System Picker to choose the destination by the user. This will return Uri of the destination directory.
private ActivityResultLauncher<Intent> launcher; // Initialise this object in Activity.onCreate()
private Uri baseDocumentTreeUri;
public void launchBaseDirectoryPicker() {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
launcher.launch(intent);
}
Step 2: Launch System Picker to choose the destination by the user. This will return the Uri of the destination directory. Also, you can optionally persist the permissions and Uri for future use.
#Override
public void onActivityResult(ActivityResult result) {
if (result.getResultCode() == Activity.RESULT_OK) {
baseDocumentTreeUri = Objects.requireNonNull(result.getData()).getData();
final int takeFlags = (Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
// take persistable Uri Permission for future use
context.getContentResolver().takePersistableUriPermission(result.getData().getData(), takeFlags);
SharedPreferences preferences = context.getSharedPreferences("com.example.fileutility", Context.MODE_PRIVATE);
preferences.edit().putString("filestorageuri", result.getData().getData().toString()).apply();
} else {
Log.e("FileUtility", "Some Error Occurred : " + result);
}
}
Step 3: Write CSV content into a file.
public void writeFile(String fileName, String content) {
try {
DocumentFile directory = DocumentFile.fromTreeUri(context, baseDocumentTreeUri);
DocumentFile file = directory.createFile("text/*", fileName);
ParcelFileDescriptor pfd = context.getContentResolver().openFileDescriptor(file.getUri(), "w");
FileOutputStream fos = new FileOutputStream(pfd.getFileDescriptor());
fos.write(content.getBytes());
fos.close();
} catch (IOException e) {
}
}
For more explanation, you can read "How to Save a file in Shared Storage in Android 10 or Higher" or Android official documentation.

Saving a bitmap to disk/gallery in Android 4.3

I've been using the way the system saves screenshots to save my bitmaps to the disk and gallery. This works in Android 4.2 and before but not in Android 4.3.
Relevant code :
Uri imageUri = resolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
OutputStream out = resolver.openOutputStream(uri);
Full code here.
In 4.3 (new Nexus 7) however, I get a FileNotFoundException on the second line. I couldn't see any changes in 4.3 relevant to this on the website.
So what is the right way to save an image to the disk and gallery?
Verified :
storage is mounted with this method
imageUri is not null (usually something like "content://media/external/images/media/2034")
manifest has permission android.permission.WRITE_EXTERNAL_STORAGE

This is the way I save bitmaps to the Gallery:
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
Uri contentUri; //instantiate Uri with location of image
mediaScanIntent.setData(contentUri);
context.sendBroadcast(mediaScanIntent);

In your manifest file try with change target sdk to 18.-
<uses-sdk android:minSdkVersion="7"
android:targetSdkVersion="18"/>
It might solve your prob(May not). In 4.3 JELLY_BEAN_MR2, android did couple of changes and android clearly written that Your app might misbehave in a restricted profile environment. so please look at http://developer.android.com/about/versions/android-4.3.html

I have these permission in my Manifest.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
But I am using a Target SDK version 15. Is there a requirement that you have to use a target SDK 18?
BTW:
Here is a sample code for downloading profile pictures from Facebook:
private class DownloadProfilePicTask extends AsyncTask<Void,String,String> {
Bitmap profilePic;
String fileName;
String id;
String type;
URL img_value;
public DownloadProfilePicTask(String i,String ty)
{
id = i;
if(id==null)
{
//Log.v("Id is null", "Error");
}
//Log.v("Download Profile Pic Task initialized for id:",id);
type = ty;
}
#Override
protected String doInBackground(Void...param) {
String root = Environment.getExternalStorageDirectory().toString();
if(root==null)
{
return null;
}
try{
profilePic = BitmapFactory.decodeStream(img_value.openConnection().getInputStream());
}
catch (IOException e) {
e.printStackTrace();
}
if(profilePic == null)
{
//Log.v("profilePic is null", "Error");
}
//Log.v("Root for saving images",root );
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
fileName = root + "/saved_images/" + id + ".png";
//Log.v("filename is ",fileName);
File file = new File (fileName);
fileName = file.getPath();
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
profilePic.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
return id;
}
#Override
protected void onPreExecute()
{
try
{
img_value = new URL("http://graph.facebook.com/"+id+"/picture?type=" + type);
}
catch (MalformedURLException e) {
e.printStackTrace();
}
}
#Override
protected void onPostExecute(String result) {
}
}
and then I just call:
new DownloadProfilePicTask(id,type).execute();
to download and automatically save images.
Note: You will have to play with filePath a bit for exact location.

There some changes in the fileSystem on Android 4.3 to start to avoid dev. to directly write in "/sdcard" or "/mnt/sdcard" but use the android ExternalStorage system. (http://source.android.com/devices/tech/storage/index.html)
N.B. : ExternalStorage can be an internal memory :p
For your case, have you tryed to use a method based on getExternalStorage ?
(like this : Find an external SD card location)

How to delete a file from SD card

I am creating a file to send as an attachment to an email. Now I want to delete the image after sending the email. Is there a way to delete the file?
I have tried myFile.delete(); but it didn't delete the file.
I'm using this code for Android, so the programming language is Java using the usual Android ways to access the SD card. I am deleting the file in the onActivityResult method, when an Intent is returned to the screen after sending an email.

File file = new File(selectedFilePath);
boolean deleted = file.delete();
where selectedFilePath is the path of the file you want to delete - for example:
/sdcard/YourCustomDirectory/ExampleFile.mp3

Also you have to give permission if you are using >1.6 SDK
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
in AndroidManifest.xml file

Change for Android 4.4+
Apps are not allowed to write (delete, modify ...) to external storage except to their package-specific directories.
As Android documentation states:
"Apps must not be allowed to write to secondary external storage
devices, except in their package-specific directories as allowed by
synthesized permissions."
However nasty workaround exists (see code below). Tested on Samsung Galaxy S4, but this fix does't work on all devices. Also I wouldn’t count on this workaround being available in future versions of Android.
There is a great article explaining (4.4+) external storage permissions change.
You can read more about workaround here.
Workaround source code is from this site.
public class MediaFileFunctions
{
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static boolean deleteViaContentProvider(Context context, String fullname)
{
Uri uri=getFileUri(context,fullname);
if (uri==null)
{
return false;
}
try
{
ContentResolver resolver=context.getContentResolver();
// change type to image, otherwise nothing will be deleted
ContentValues contentValues = new ContentValues();
int media_type = 1;
contentValues.put("media_type", media_type);
resolver.update(uri, contentValues, null, null);
return resolver.delete(uri, null, null) > 0;
}
catch (Throwable e)
{
return false;
}
}
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
private static Uri getFileUri(Context context, String fullname)
{
// Note: check outside this class whether the OS version is >= 11
Uri uri = null;
Cursor cursor = null;
ContentResolver contentResolver = null;
try
{
contentResolver=context.getContentResolver();
if (contentResolver == null)
return null;
uri=MediaStore.Files.getContentUri("external");
String[] projection = new String[2];
projection[0] = "_id";
projection[1] = "_data";
String selection = "_data = ? "; // this avoids SQL injection
String[] selectionParams = new String[1];
selectionParams[0] = fullname;
String sortOrder = "_id";
cursor=contentResolver.query(uri, projection, selection, selectionParams, sortOrder);
if (cursor!=null)
{
try
{
if (cursor.getCount() > 0) // file present!
{
cursor.moveToFirst();
int dataColumn=cursor.getColumnIndex("_data");
String s = cursor.getString(dataColumn);
if (!s.equals(fullname))
return null;
int idColumn = cursor.getColumnIndex("_id");
long id = cursor.getLong(idColumn);
uri= MediaStore.Files.getContentUri("external",id);
}
else // file isn't in the media database!
{
ContentValues contentValues=new ContentValues();
contentValues.put("_data",fullname);
uri = MediaStore.Files.getContentUri("external");
uri = contentResolver.insert(uri,contentValues);
}
}
catch (Throwable e)
{
uri = null;
}
finally
{
cursor.close();
}
}
}
catch (Throwable e)
{
uri=null;
}
return uri;
}
}

Android Context has the following method:
public abstract boolean deleteFile (String name)
I believe this will do what you want with the right App premissions as listed above.

Recursively delete all children of the file ...
public static void DeleteRecursive(File fileOrDirectory) {
if (fileOrDirectory.isDirectory()) {
for (File child : fileOrDirectory.listFiles()) {
DeleteRecursive(child);
}
}
fileOrDirectory.delete();
}

This works for me: (Delete image from Gallery)
File file = new File(photoPath);
file.delete();
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(new File(photoPath))));

public static boolean deleteDirectory(File path) {
// TODO Auto-generated method stub
if( path.exists() ) {
File[] files = path.listFiles();
for(int i=0; i<files.length; i++) {
if(files[i].isDirectory()) {
deleteDirectory(files[i]);
}
else {
files[i].delete();
}
}
}
return(path.delete());
}
This Code will Help you.. And In Android Manifest You have to get Permission to make modification..
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Try this.
File file = new File(FilePath);
FileUtils.deleteDirectory(file);
from Apache Commons

Sorry: There is a mistake in my code before because of the site validation.
String myFile = "/Name Folder/File.jpg";
String myPath = Environment.getExternalStorageDirectory()+myFile;
File f = new File(myPath);
Boolean deleted = f.delete();
I think is clear...
First you must to know your file location.
Second,,, Environment.getExternalStorageDirectory() is a method who gets your app directory.
Lastly the class File who handle your file...

I had a similar issue with an application running on 4.4. What I did was sort of a hack.
I renamed the files and ignored them in my application.
ie.
File sdcard = Environment.getExternalStorageDirectory();
File from = new File(sdcard,"/ecatAgent/"+fileV);
File to = new File(sdcard,"/ecatAgent/"+"Delete");
from.renameTo(to);

This worked for me.
String myFile = "/Name Folder/File.jpg";
String my_Path = Environment.getExternalStorageDirectory()+myFile;
File f = new File(my_Path);
Boolean deleted = f.delete();

private boolean deleteFromExternalStorage(File file) {
String fileName = "/Music/";
String myPath= Environment.getExternalStorageDirectory().getAbsolutePath() + fileName;
file = new File(myPath);
System.out.println("fullPath - " + myPath);
if (file.exists() && file.canRead()) {
System.out.println(" Test - ");
file.delete();
return false; // File exists
}
System.out.println(" Test2 - ");
return true; // File not exists
}

You can delete a file as follow:
File file = new File("your sdcard path is here which you want to delete");
file.delete();
if (file.exists()){
file.getCanonicalFile().delete();
if (file.exists()){
deleteFile(file.getName());
}
}

File filedel = new File("/storage/sdcard0/Baahubali.mp3");
boolean deleted1 = filedel.delete();
Or, Try This:
String del="/storage/sdcard0/Baahubali.mp3";
File filedel2 = new File(del);
boolean deleted1 = filedel2.delete();