Develop Reference

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 - file.exists() returns false for existing file (for anything different than pdf)

Both files are present on the sdcard, but for whatever reason exists() returns false the the png file.
//String path = "/mnt/sdcard/Android/data/com.gemoro.toffer/cache/1551619351/0/foto/-921042926.png";
String path = "/mnt/sdcard/Android/data/com.gemoro.toffer/cache/1551619351/0/foto/-1200240592.pdf";
File file2 = new File(path);
if (null != file2)
{
if(file2.exists())
{
LOG.x("file exist");
}
else
{
LOG.x("file does not exist");
}
}
Now, I've look at what's under the hood, what the method file.exists() does actually and this is what it does:
public boolean exists()
{
return doAccess(F_OK);
}
private boolean doAccess(int mode)
{
try
{
return Libcore.os.access(path, mode);
}
catch (ErrnoException errnoException)
{
return false;
}
}
May it be that the method finishes by throwing the exception and returning false?
If so,
how can I make this work
what other options to check if a file exists on the sdcard are available for use?
Thanks.

1 You need get the permission of device
Add this to AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
2 Get the external storage directory
File sdDir = Environment.getExternalStorageDirectory();
3 At last, check the file
File file = new File(sdDir + filename /* what you want to load in SD card */);
if (!file.canRead()) {
return false;
}
return true;
Note: filename is the path in the sdcard, not in root.
For example: you want find
/mnt/sdcard/Android/data/com.gemoro.toffer/cache/1551619351/0/foto/-921042926.png
then filename is
./Android/data/com.gemoro.toffer/cache/1551619351/0/foto/-921042926.png
.

Please try this code. Hope it should helpful for you. I am using this code only. Its working fine for me to find the file is exists or not. Please try and let me know.
File file = new File(path);
if (!file.isFile()) {
Log.e("uploadFile", "Source File not exist :" + filePath);
}else{
Log.e("uploadFile","file exist");
}

Check that USB Storage is not connected to the PC. Since Android device is connected to the PC as storage the files are not available for the application and you get FALSE to File.Exists().

Check file exist in internal storage
Example : /storage/emulated/0/FOLDER_NAME/FILE_NAME.EXTENTION
check permission (write storage)
and check file exist or not
public static boolean isFilePresent(String fileName) {
return getFilePath(fileName).isFile();
}
get File from the file name
public static File getFilePath(String fileName){
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
File folder = new File(extStorageDirectory, "FOLDER_NAME");
File filePath = new File(folder + "/" + fileName);
return filePath;
}

How to list files in an android directory?

Here's my code so far:
String path = Environment.getExternalStorageDirectory().toString()+"/Pictures";
AssetManager mgr = getAssets();
try {
String list[] = mgr.list(path);
Log.e("FILES", String.valueOf(list.length));
if (list != null)
for (int i=0; i<list.length; ++i)
{
Log.e("FILE:", path +"/"+ list[i]);
}
} catch (IOException e) {
Log.v("List error:", "can't list" + path);
}
Yet while I do have files in that dir, it returns me list.length = 0... any ideas?

In order to access the files, the permissions must be given in the manifest file.
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
Try this:
String path = Environment.getExternalStorageDirectory().toString()+"/Pictures";
Log.d("Files", "Path: " + path);
File directory = new File(path);
File[] files = directory.listFiles();
Log.d("Files", "Size: "+ files.length);
for (int i = 0; i < files.length; i++)
{
Log.d("Files", "FileName:" + files[i].getName());
}

I just discovered that:
new File("/sdcard/").listFiles()
returns null if you do not have:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
set in your AndroidManifest.xml file.

Well, the AssetManager lists files within the assets folder that is inside of your APK file. So what you're trying to list in your example above is [apk]/assets/sdcard/Pictures.
If you put some pictures within the assets folder inside of your application, and they were in the Pictures directory, you would do mgr.list("/Pictures/").
On the other hand, if you have files on the sdcard that are outside of your APK file, in the Pictures folder, then you would use File as so:
File file = new File(Environment.getExternalStorageDirectory(), "Pictures");
File[] pictures = file.listFiles();
...
for (...)
{
log.e("FILE:", pictures[i].getAbsolutePath());
}
And relevant links from the docs:
File
Asset Manager

In addition to all the answers above:
If you are on Android 6.0+ (API Level 23+) you have to explicitly ask for permission to access external storage. Simply having
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
in your manifest won't be enough. You also have actively request the permission in your activity:
//check for permission
if(ContextCompat.checkSelfPermission(this,
Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED){
//ask for permission
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, READ_EXTERNAL_STORAGE_PERMISSION_CODE);
}
I recommend reading this:
http://developer.android.com/training/permissions/requesting.html#perm-request

Updated working method
My minSdkversion is 21, so I'm using ContextCompat.checkSelfPermission() method to grant permissions apart from also adding the <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> in manifest. Thus, to get rid of the NullPointerException in spite of having files in your targeted directory, grant permissions as follows:-
MainActivity.java
public class MainActivity extends AppCompatActivity {
/*Other variables & constants here*/
private final int READ_EXTERNAL_STORAGE=100;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// ignore the button code
Button btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openWebView();
}
});
/*---------------------------- GRANT PERMISSIONS START-------------------------*/
// Main part to grant permission. Handle other cases of permission denied
// yourself.
if(ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)
ActivityCompat.requestPermissions(this,new String[] {Manifest.permission.READ_EXTERNAL_STORAGE},READ_EXTERNAL_STORAGE);
/*---------------------------- GRANT PERMISSIONS OVER-------------------------*/
}
And the function that list all the files (in MainActivity.java), thanks to #Yury:-
public void getDownloadedFile() {
String path = Environment.getExternalStorageDirectory().toString()+"/Download/";
Log.d("Files", "Path: " + path);
File directory = new File(path);
File[] files = directory.listFiles();
if(directory.canRead() && files!=null) {
Log.d("Files", "Size: " + files.length);
for(File file: files)
Log.d("FILE",file.getName());
}
else
Log.d("Null?", "it is null");
}

Your path is not within the assets folder. Either you enumerate files within the assets folder by means of AssetManager.list() or you enumerate files on your SD card by means of File.list()

Yury's answer needs some elaboration for newer versions of Android.
First, make sure to defined READ_EXTERNAL_STORAGE permission in manifest file.
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
Include the below, for SDK greater than or equals to Android 10(Q).
<application android:requestLegacyExternalStorage="true"...</application>
Now you can list files in a directory.
String path = Environment.getExternalStorageDirectory().toString()+"/Pictures";
Log.d("Files", "Path: " + path);
File directory = new File(path);
File[] files = directory.listFiles();
Log.d("Files", "Size: "+ files.length);
for (int i = 0; i < files.length; i++)
{
Log.d("Files", "FileName:" + files[i].getName());
}

String[] listOfFiles = getActivity().getFilesDir().list();
or
String[] listOfFiles = Environment.getExternalStoragePublicDirectory (Environment.DIRECTORY_DOWNLOADS).list();

Try this:
public class GetAllFilesInDirectory {
public static void main(String[] args) throws IOException {
File dir = new File("dir");
System.out.println("Getting all files in " + dir.getCanonicalPath() + " including those in subdirectories");
List<File> files = (List<File>) FileUtils.listFiles(dir, TrueFileFilter.INSTANCE, TrueFileFilter.INSTANCE);
for (File file : files) {
System.out.println("file: " + file.getCanonicalPath());
}
}
}

There are two things that could be happening:
You are not adding READ_EXTERNAL_STORAGE permission to your AndroidManifest.xml
You are targeting Android 23 and you're not asking for that permission to the user. Go down to Android 22 or ask the user for that permission.

Try these
String appDirectoryName = getResources().getString(R.string.app_name);
File directory = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + getResources().getString(R.string.app_name));
directory.mkdirs();
File[] fList = directory.listFiles();
int a = 1;
for (int x = 0; x < fList.length; x++) {
//txt.setText("You Have Capture " + String.valueOf(a) + " Photos");
a++;
}
//get all the files from a directory
for (File file : fList) {
if (file.isFile()) {
list.add(new ModelClass(file.getName(), file.getAbsolutePath()));
}
}

If you are on Android 10/Q and you did all of the correct things to request access permissions to read external storage and it still doesn't work, it's worth reading this answer:
Android Q (10) ask permission to get access all storage. Scoped storage
I had working code, but me device took it upon itself to update when it was on a network connection (it was usually without a connection.) Once in Android 10, the file access no longer worked. The only easy way to fix it without rewriting the code was to add that extra attribute to the manifest as described. The file access now works as in Android 9 again. YMMV, it probably won't continue to work in future versions.

For the people are still getting NullPointerException when they try to get file list, if you using Android API 29+ then you need to add
<application android:requestLegacyExternalStorage="true"...
in your AndroidManifest.xml file.
Then request for storage permission again.

Simple way to list files in android device in a specific folder
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
IN Kotlin
val fileRoot = Environment.getExternalStorageDirectory()
val yourDir = File(fileRoot, "FOLDER_NAME")
for (f in yourDir.listFiles()!!) {
if (f.isFile){
print(f.name)
}
}
All the file name will be printed with the file extension

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();

How to create directory automatically on SD card

I'm trying to save my file to the following location
FileOutputStream fos = new FileOutputStream("/sdcard/Wallpaper/"+fileName);
but I'm getting the exception java.io.FileNotFoundException
However, when I put the path as "/sdcard/" it works.
Now I'm assuming that I'm not able to create directory automatically this way.
Can someone suggest how to create a directory and sub-directory using code?

If you create a File object that wraps the top-level directory you can call it's mkdirs() method to build all the needed directories. Something like:
// create a File object for the parent directory
File wallpaperDirectory = new File("/sdcard/Wallpaper/");
// have the object build the directory structure, if needed.
wallpaperDirectory.mkdirs();
// create a File object for the output file
File outputFile = new File(wallpaperDirectory, filename);
// now attach the OutputStream to the file object, instead of a String representation
FileOutputStream fos = new FileOutputStream(outputFile);
Note: It might be wise to use Environment.getExternalStorageDirectory() for getting the "SD Card" directory as this might change if a phone comes along which has something other than an SD Card (such as built-in flash, a'la the iPhone). Either way you should keep in mind that you need to check to make sure it's actually there as the SD Card may be removed.
UPDATE: Since API Level 4 (1.6) you'll also have to request the permission. Something like this (in the manifest) should work:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Had the same problem and just want to add that AndroidManifest.xml also needs this permission:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Here is what works for me.
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
in your manifest and the code below
public static boolean createDirIfNotExists(String path) {
boolean ret = true;
File file = new File(Environment.getExternalStorageDirectory(), path);
if (!file.exists()) {
if (!file.mkdirs()) {
Log.e("TravellerLog :: ", "Problem creating Image folder");
ret = false;
}
}
return ret;
}

Actually I used part of #fiXedd asnwer and it worked for me:
//Create Folder
File folder = new File(Environment.getExternalStorageDirectory().toString()+"/Aqeel/Images");
folder.mkdirs();
//Save the path as a string value
String extStorageDirectory = folder.toString();
//Create New file and name it Image2.PNG
File file = new File(extStorageDirectory, "Image2.PNG");
Make sure that you are using mkdirs() not mkdir() to create the complete path

With API 8 and greater, the location of the SD card has changed. #fiXedd's answer is good, but for safer code, you should use Environment.getExternalStorageState() to check if the media is available. Then you can use getExternalFilesDir() to navigate to the directory you want (assuming you're using API 8 or greater).
You can read more in the SDK documentation.

Make sure external storage is present:
http://developer.android.com/guide/topics/data/data-storage.html#filesExternal
private boolean isExternalStoragePresent() {
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
mExternalStorageAvailable = mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
// Something else is wrong. It may be one of many other states, but
// all we need
// to know is we can neither read nor write
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
if (!((mExternalStorageAvailable) && (mExternalStorageWriteable))) {
Toast.makeText(context, "SD card not present", Toast.LENGTH_LONG)
.show();
}
return (mExternalStorageAvailable) && (mExternalStorageWriteable);
}

Don't forget to make sure that you have no special characters in your file/folder names. Happened to me with ":" when I was setting folder names using variable(s)
not allowed characters in file/folder names
" * / : < > ? \ |
U may find this code helpful in such a case.
The below code removes all ":" and replaces them with "-"
//actualFileName = "qwerty:asdfg:zxcvb" say...
String[] tempFileNames;
String tempFileName ="";
String delimiter = ":";
tempFileNames = actualFileName.split(delimiter);
tempFileName = tempFileNames[0];
for (int j = 1; j < tempFileNames.length; j++){
tempFileName = tempFileName+" - "+tempFileNames[j];
}
File file = new File(Environment.getExternalStorageDirectory(), "/MyApp/"+ tempFileName+ "/");
if (!file.exists()) {
if (!file.mkdirs()) {
Log.e("TravellerLog :: ", "Problem creating Image folder");
}
}

//Create File object for Parent Directory
File wallpaperDir = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() +File.separator + "wallpaper");
if (!wallpaperDir.exists()) {
wallpaperDir.mkdir();
}
File out = new File(wallpaperDir, wallpaperfile);
FileOutputStream outputStream = new FileOutputStream(out);

I was facing the same problem, unable to create directory on Galaxy S but was able to create it successfully on Nexus and Samsung Droid. How I fixed it was by adding following line of code:
File dir = new File(Environment.getExternalStorageDirectory().getPath()+"/"+getPackageName()+"/");
dir.mkdirs();

File sdcard = Environment.getExternalStorageDirectory();
File f=new File(sdcard+"/dor");
f.mkdir();
this will create a folder named dor in your sdcard.
then to fetch file for eg- filename.json which is manually inserted in dor folder. Like:
File file1 = new File(sdcard,"/dor/fitness.json");
.......
.....
< uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
and don't forget to add code in manifest

This will make folder in sdcard with Folder name you provide.
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Folder name");
if (!file.exists()) {
file.mkdirs();
}

Just completing the Vijay's post...
Manifest
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
Function
public static boolean createDirIfNotExists(String path) {
boolean ret = true;
File file = new File(Environment.getExternalStorageDirectory(), path);
if (!file.exists()) {
if (!file.mkdirs()) {
Log.e("TravellerLog :: ", "Problem creating Image folder");
ret = false;
}
}
return ret;
}
Usage
createDirIfNotExists("mydir/"); //Create a directory sdcard/mydir
createDirIfNotExists("mydir/myfile") //Create a directory and a file in sdcard/mydir/myfile.txt
You could check for errors
if(createDirIfNotExists("mydir/")){
//Directory Created Success
}
else{
//Error
}

ivmage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE_ADD);
}
});`