How to create directory automatically on SD card

Question

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

User · Accepted Answer

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" />

User · Answer

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

User · Answer

Had the same problem and just want to add that AndroidManifest xml also needs this permission    lt uses-permission android name  android permission WRITE EXTERNAL STORAGE    gt

User · Answer

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

User · Answer

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   amp  amp   mExternalStorageWriteable                  Toast makeText context   SD card not present   Toast LENGTH LONG                       show                       return  mExternalStorageAvailable   amp  amp   mExternalStorageWriteable

User · Answer

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

User · Answer

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

User · Answer

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                       lt  uses-permission android name  android permission WRITE EXTERNAL STORAGE      and don t forget to add  code in manifest

User · Answer

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

User · Answer

I faced the same problem  There are two types of permissions in Android    Dangerous  access to contacts  write to external storage     Normal   Normal permissions are automatically approved by Android while dangerous permissions need to be approved by Android users     Here is the strategy to get dangerous permissions in Android 6 0   Check if you have the permission granted If your app is already granted the permission  go ahead and perform normally  If your app doesn t have the permission yet  ask for user to approve Listen to user approval in onRequestPermissionsResult   Here is my case  I need to write to external storage   First  I check if I have the permission       private static final int REQUEST WRITE STORAGE   112      boolean hasPermission    ContextCompat checkSelfPermission activity              Manifest permission WRITE EXTERNAL STORAGE     PackageManager PERMISSION GRANTED   if   hasPermission        ActivityCompat requestPermissions parentActivity                  new String   Manifest permission WRITE EXTERNAL STORAGE                   REQUEST WRITE STORAGE       Then check the user s approval    Override public void onRequestPermissionsResult int requestCode  String   permissions  int   grantResults        super onRequestPermissionsResult requestCode  permissions  grantResults       switch  requestCode                case REQUEST WRITE STORAGE                if  grantResults length  gt  0  amp  amp  grantResults 0     PackageManager PERMISSION GRANTED                                  reload my activity with permission granted or use the features what required the permission               else                               Toast makeText parentActivity   The app was not allowed to write to your storage  Hence  it cannot function properly  Please consider granting it this permission   Toast LENGTH LONG  show

User · Answer

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

User · Answer

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

User · Answer

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                    lt                    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  lt  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

User · Answer

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

[android] How to create directory automatically on SD card

Examples related to android

Examples related to android-file