Creating a directory in sdcard fails

Question

I have been trying to create a directory in  sdcard programmatically  but it s not working   The code below always outputs directory not created   boolean success    new File   sdcard map    mkdir     if   success        Log i  directory not created    directory not created      else       Log i  directory created    directory created

User · Answer

Isn t it already created   Mkdir returns false if the folder already exists too mkdir

User · Answer

I had same issue after I updated my Android phone to 6 0  API level 23   The following solution works on me  Hopefully it helps you as well    Please check your android version  If it is    6 0  API level 23   you need to not only include    lt uses-permission android name  android permission WRITE EXTERNAL STORAGE   gt    in your AndroidManifest xml  but also request permission before calling mkdir    Code snopshot    public static final int MY PERMISSIONS REQUEST WRITE EXTERNAL STORAGE   1  public int mkFolder String folderName      make a folder under Environment DIRECTORY DCIM     String state   Environment getExternalStorageState        if   Environment MEDIA MOUNTED equals state            Log d  myAppName    Error  external storage is unavailable            return 0            if  Environment MEDIA MOUNTED READ ONLY equals state             Log d  myAppName    Error  external storage is read only             return 0            Log d  myAppName    External storage is not read only or unavailable         if  ContextCompat checkSelfPermission this     request permission when it is not granted               Manifest permission WRITE EXTERNAL STORAGE                 PackageManager PERMISSION GRANTED            Log d  myAppName    permission WRITE EXTERNAL STORAGE  NOT granted                Should we show an explanation          if  ActivityCompat shouldShowRequestPermissionRationale this                  Manifest permission WRITE EXTERNAL STORAGE                     Show an expanation to the user  asynchronously  -- don t block                this thread waiting for the user s response  After the user                sees the explanation  try again to request the permission             else                   No explanation needed  we can request the permission               ActivityCompat requestPermissions this                      new String   Manifest permission WRITE EXTERNAL STORAGE                       MY PERMISSIONS REQUEST WRITE EXTERNAL STORAGE                   MY PERMISSIONS REQUEST READ CONTACTS is an                app-defined int constant  The callback method gets the                result of the request                      File folder   new File Environment getExternalStoragePublicDirectory Environment DIRECTORY DCIM  folderName       int result   0      if  folder exists              Log d  myAppName   folder exist   folder toString             result   2     folder exist      else          try               if  folder mkdir                      Log d  myAppName    folder created     folder toString                     result   1     folder created               else                   Log d  myAppName    creat folder fails     folder toString                     result   0     creat folder fails                        catch  Exception ecp               ecp printStackTrace                        return result      Override public void onRequestPermissionsResult int requestCode                                         String permissions    int   grantResults        switch  requestCode            case MY PERMISSIONS REQUEST WRITE EXTERNAL STORAGE                   If request is cancelled  the result arrays are empty              if  grantResults length  gt  0                      amp  amp  grantResults 0     PackageManager PERMISSION GRANTED                        permission was granted  yay  Do the                    contacts-related task you need to do                 else                       permission denied  boo  Disable the                    functionality that depends on this permission                            return                        other  case  lines to check for other            permissions this app might request           More information please read  Requesting Permissions at Run Time

User · Answer

Restart your Android device  Things started to work for me after I restarted the device

User · Answer

File f   new File Environment getExternalStorageDirectory   getAbsolutePath               FoderName    if   f exists          f mkdirs

User · Answer

in android api    23       lt uses-permission android name  android permission WRITE EXTERNAL STORAGE   gt    instead of       lt app uses-permission android name  android permission WRITE EXTERNAL STORAGE   gt

User · Answer

The correct path to the sdcard is   mnt sdcard    but  as answered before  you shouldn t hardcode it  If you are on Android 2 1 or after  use  getExternalFilesDir String type     Otherwise   Environment getExternalStorageDirectory     Read carefully https   developer android com guide topics data data-storage html filesExternal  Also  you ll need to use this method or something similar  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      then check if you can access the sdcard  As said  read the official documentation   Another option  maybe you need to use mkdirs instead of mkdir  file mkdirs     Creates the directory named by the trailing filename of this file  including the complete directory path required to create this directory

User · Answer

There are three things to consider here    Don t assume that the sd card is mounted at  sdcard  May be true in the default case  but better not to hard code    You can get the location of sdcard by querying the system   Environment getExternalStorageDirectory     You have to inform Android that your application needs to write to external storage by adding a uses-permission entry in the AndroidManifest xml file    lt uses-permission android name  android permission WRITE EXTERNAL STORAGE   gt   If this directory already exists  then mkdir is going to return false  So check for the existence of the directory  and then try creating it if it does not exist  In your component  use something like   File folder   new File Environment getExternalStorageDirectory       map    boolean success   true  if   folder exists          success   folder mkdir      if  success           Do something on success   else          Do something else on failure

User · Answer

use mkdirs   instead of mkdir    it worked for me     File folder   new File Environment getExternalStorageDirectory     Saved CGPA    if  folder exists         if folder mkdirs        Toast makeText this   New Folder Created   Toast LENGTH SHORT  show       File sdCardFile   new File Environment getExternalStorageDirectory     Saved CGPA cgpa html

User · Answer

There are Many Things You Need to worry about  1 If you are using Android Bellow Marshmallow then you have to set permesions in Manifest File  2  If you are using later Version of Android means from Marshmallow to Oreo now  Either you have to go to the App Info and Set there manually App permission for Storage  if you want to Set it at Run Time you can do that by below code  public  boolean isStoragePermissionGranted     if  Build VERSION SDK INT  gt   23        if  checkSelfPermission android Manifest permission WRITE EXTERNAL STORAGE                 PackageManager PERMISSION GRANTED            Log v TAG  Permission is granted            return true        else            Log v TAG  Permission is revoked            ActivityCompat requestPermissions this  new String   Manifest permission WRITE EXTERNAL STORAGE   1           return false          else     permission is automatically granted on sdk lt 23 upon installation     Log v TAG  Permission is granted        return true

User · Answer

I made the mistake of including both    lt uses-permission android name  android permission WRITE EXTERNAL STORAGE   gt    and    lt uses-permission android name  android permission READ EXTERNAL STORAGE   gt    in the above order  So when I took out the second permission   READ   the problem went away

User · Answer

If this is happening to you with Android 6 and compile target    23  don t forget that we are now using runtime permissions  So giving permissions in the manifest is not enough anymore

User · Answer

Do you have the right permissions to write to SD card in your manifest   Look for WRITE EXTERNAL STORAGE at http   developer android com reference android Manifest permission html

[android] Creating a directory in /sdcard fails

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