Android saving file to external storage

Question

I have a little issue with creating a directory and saving a file to it on my android application  I m using this piece of code to do this    String filename    MyApp MediaTag MediaTag-  objectId   png   File file   new File Environment getExternalStorageDirectory    filename   FileOutputStream fos   fos   new FileOutputStream file   fos write mediaTagBuffer   fos flush    fos close      But it s throwing an exception       java io FileNotFoundException   mnt sdcard MyApp MediaCard MediaCard-0 png  No such file or directory    on that line   fos   new FileOutputStream file    If I set the filename to    MyApp MediaTag-  objectId   it s working  but If I try to create and save the file to an another directory it s throwing the exception  So any ideas what I m doing wrong   And another question  Is there any way to make my files private in external storage so user can t see them in gallery  only if he connect his device as Disk Drive

User · Answer

since android 4 4 file saving has been changed  there is   ContextCompat getExternalFilesDirs context  name     it retuns an array    when name is null   the first value is like  storage emulated 0 Android com my package files  the second value is like  storage extSdCard Android com my package files  android 4 3 and less it retuns a single item array  parts of little messy code but it demonstrates how it works           Create a File for saving an image or video          throws Exception        private File getOutputMediaFile int type  throws Exception              Check that the SDCard is mounted         File mediaStorageDir          if internalstorage isChecked                          mediaStorageDir   new File getFilesDir   getAbsolutePath                        else                       File   dirs ContextCompat getExternalFilesDirs this  null               mediaStorageDir   new File dirs dirs length gt 1 1 0  getAbsolutePath                             Create the storage directory MyCameraVideo  if it does not exist         if    mediaStorageDir exists                  if    mediaStorageDir mkdirs                      output setText  Failed to create directory                      Toast makeText this   Failed to create directory    Toast LENGTH LONG  show                     Log d  myapp    Failed to create directory                    return null                                       Create a media file name             For unique file name appending current timeStamp with file name         java util Date date  new java util Date            String timeStamp   new SimpleDateFormat  yyyyMMdd HHmmss  Locale ENGLISH    format date getTime              File mediaFile           if type    MEDIA TYPE VIDEO                    For unique video file name appending current timeStamp with file name             mediaFile   new File mediaStorageDir getPath     File separator   slpid         pwsid         timeStamp     mp4                       else if type    MEDIA TYPE AUDIO                    For unique video file name appending current timeStamp with file name             mediaFile   new File mediaStorageDir getPath     File separator   slpid         pwsid         timeStamp     3gp               else               return null                     return mediaFile                   Create a file Uri for saving an image or video          throws Exception        private  Uri getOutputMediaFileUri int type  throws Exception             return Uri fromFile getOutputMediaFile type             usage          try               file getOutputMediaFileUri MEDIA TYPE AUDIO  getPath              catch  Exception e1                e1 printStackTrace                return

User · Answer

Try This     Check External storage device  Write File Read File     public class WriteSDCard extends Activity        private static final String TAG    MEDIA       private TextView tv        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main           tv    TextView  findViewById R id TextView01           checkExternalMedia            writeToSDFile            readRaw                          Method to check whether external media available and writable  This is        adapted from        http   developer android com guide topics data data-storage html         filesExternal             private void checkExternalMedia             boolean mExternalStorageAvailable   false          boolean mExternalStorageWriteable   false          String state   Environment getExternalStorageState            if  Environment MEDIA MOUNTED equals state                    Can read and write the media             mExternalStorageAvailable   mExternalStorageWriteable   true            else if  Environment MEDIA MOUNTED READ ONLY equals state                    Can only read the media             mExternalStorageAvailable   true              mExternalStorageWriteable   false            else                  Can t read or write             mExternalStorageAvailable   mExternalStorageWriteable   false                    tv append   n nExternal Media  readable     mExternalStorageAvailable                 writable     mExternalStorageWriteable                         Method to write ascii text characters to file on SD card  Note that you        must add a WRITE EXTERNAL STORAGE permission to the manifest file or this        method will throw a FileNotFound Exception because you won t have write        permission              private void writeToSDFile                Find the root of the external storage             See http   developer android com guide topics data data-            storage html filesExternal         File root   android os Environment getExternalStorageDirectory            tv append   nExternal file system root      root              See            http   stackoverflow com questions 3551821 android-write-to-sd-card-folder         File dir   new File root getAbsolutePath       download            dir mkdirs            File file   new File dir   myData txt            try               FileOutputStream f   new FileOutputStream file               PrintWriter pw   new PrintWriter f               pw println  Hi   How are you                pw println  Hello                pw flush                pw close                f close              catch  FileNotFoundException e                e printStackTrace                Log i TAG           File not found  Did you                      add a WRITE EXTERNAL STORAGE permission to the   manifest               catch  IOException e                e printStackTrace                      tv append   n nFile written to     file                         Method to read in a text file placed in the res raw directory of the        application  The method reads in all lines of the file sequentially              private void readRaw             tv append   nData read from res raw textfile txt             InputStream is   this getResources   openRawResource R raw textfile           InputStreamReader isr   new InputStreamReader is           BufferedReader br   new BufferedReader isr  8192      2nd arg is buffer            size            More efficient  less readable  implementation of above is the            composite expression                       BufferedReader br   new BufferedReader new InputStreamReader             this getResources   openRawResource R raw textfile    8192                       try               String test              while  true                    test   br readLine                       readLine   returns null if no more lines in the file                 if  test    null  break                  tv append   n             test                             isr close                is close                br close              catch  IOException e                e printStackTrace                      tv append   n nThat is all

User · Answer

Make sure your app has the proper permissions to be allowed to write to external storage  http   developer android com reference android Manifest permission html WRITE EXTERNAL STORAGE  It should look something like this in your manifest file    lt uses-permission android name  android permission WRITE EXTERNAL STORAGE    gt

User · Answer

I have created an AsyncTask for saving bitmaps   public class BitmapSaver extends AsyncTask lt Void  Void  Void gt        public static final String TAG   BitmapSaver        private Bitmap bmp       private Context ctx       private File pictureFile       public BitmapSaver Context paramContext   Bitmap paramBitmap                ctx   paramContext           bmp   paramBitmap                 Create a File for saving an image or video        private  File getOutputMediaFile                    To be safe  you should check that the SDCard is mounted            using Environment getExternalStorageState   before doing this           File mediaStorageDir   new File Environment getExternalStorageDirectory                       Android data                     ctx getPackageName                       Files                 This location works best if you want the created images to be shared            between applications and persist after your app has been uninstalled              Create the storage directory if it does not exist         if    mediaStorageDir exists                 if    mediaStorageDir mkdirs                     return null                                      Create a media file name         String timeStamp   new SimpleDateFormat  ddMMyyyy HHmm   format new Date             File mediaFile              String mImageName  MI    timeStamp    jpg               mediaFile   new File mediaStorageDir getPath     File separator   mImageName             return mediaFile              protected Void doInBackground Void    paramVarArgs                   this pictureFile   getOutputMediaFile             if  this pictureFile    null    return null             try                       FileOutputStream localFileOutputStream   new FileOutputStream this pictureFile               this bmp compress Bitmap CompressFormat PNG  90  localFileOutputStream               localFileOutputStream close                      catch  FileNotFoundException localFileNotFoundException                        return null                    catch  IOException localIOException                              return null             protected void onPostExecute Void paramVoid                super onPostExecute paramVoid            try                         it will help you broadcast and view the saved bitmap in Gallery             this ctx sendBroadcast new Intent  android intent action MEDIA MOUNTED   Uri                      parse  file       Environment getExternalStorageDirectory                    Toast makeText this ctx   File saved   0  show                 return                    catch  Exception localException1                        try                               Context localContext   this ctx                  String   arrayOfString   new String 1                   arrayOfString 0    this pictureFile toString                    MediaScannerConnection scanFile localContext  arrayOfString  null                          new MediaScannerConnection OnScanCompletedListener                                                         public void onScanCompleted String paramAnonymousString                                       Uri paramAnonymousUri                                                                                                          return                            catch  Exception localException2

User · Answer

Use this function to save your bitmap in SD card   private void SaveImage Bitmap finalBitmap         String root   Environment getExternalStorageDirectory   toString        File myDir   new File root     saved images             if   myDir exists                          myDir mkdirs                          Random generator   new Random        int n   10000      n   generator nextInt n       String fname    Image-   n    jpg       File file   new File  myDir  fname       if  file exists           file delete          try           FileOutputStream out   new FileOutputStream file           finalBitmap compress Bitmap CompressFormat JPEG  90  out           out flush            out close           catch  Exception e             e printStackTrace              and add this in manifest   lt uses-permission android name  android permission WRITE EXTERNAL STORAGE    gt     EDIT  By using this line you will be able to see saved images in the gallery view   sendBroadcast new Intent Intent ACTION MEDIA MOUNTED                           Uri parse  file       Environment getExternalStorageDirectory         look at this link also http   rajareddypolam wordpress com  p 3 amp preview true

User · Answer

Old way of saving files might not work with new versions of android  starting with android10   fun saveMediaToStorage bitmap  Bitmap              Generating a dummy file name         val filename    quot   System currentTimeMillis    jpg quot              Output stream         var fos  OutputStream    null             For devices running android  gt   Q         if  Build VERSION SDK INT  gt   Build VERSION CODES Q                  getting the contentResolver             context  contentResolver  also   resolver - gt                      Content resolver will process the contentvalues                 val contentValues   ContentValues   apply                           putting file information in content values                     put MediaStore MediaColumns DISPLAY NAME  filename                      put MediaStore MediaColumns MIME TYPE   quot image jpg quot                       put MediaStore MediaColumns RELATIVE PATH  Environment DIRECTORY PICTURES                                        Inserting the contentValues to contentResolver and getting the Uri                 val imageUri  Uri                        resolver insert MediaStore Images Media EXTERNAL CONTENT URI  contentValues                      Opening an outputstream with the Uri that we got                 fos   imageUri  let   resolver openOutputStream it                            else                 These for devices running on android  lt  Q               So I don t think an explanation is needed here             val imagesDir                   Environment getExternalStoragePublicDirectory Environment DIRECTORY PICTURES              val image   File imagesDir  filename              fos   FileOutputStream image                      fos  use                 Finally writing the bitmap to the output stream that we opened              bitmap compress Bitmap CompressFormat JPEG  100  it              context  toast  quot Saved to Photos quot                    Reference- https   www simplifiedcoding net android-save-bitmap-to-gallery

User · Answer

The code presented by RajaReddy no longer works for KitKat  This one does  2 changes    private void saveImageToExternalStorage Bitmap finalBitmap        String root   Environment getExternalStoragePublicDirectory Environment DIRECTORY PICTURES  toString        File myDir   new File root     saved images        myDir mkdirs        Random generator   new Random        int n   10000      n   generator nextInt n       String fname    Image-    n     jpg       File file   new File myDir  fname       if  file exists            file delete        try           FileOutputStream out   new FileOutputStream file           finalBitmap compress Bitmap CompressFormat JPEG  90  out           out flush            out close              catch  Exception e            e printStackTrace                   Tell the media scanner about the new file so that it is        immediately available to the user      MediaScannerConnection scanFile this  new String     file toString      null              new MediaScannerConnection OnScanCompletedListener                     public void onScanCompleted String path  Uri uri                        Log i  ExternalStorage    Scanned     path                             Log i  ExternalStorage    - gt  uri     uri

User · Answer

Update 2018  SDK    23   Now you should also check if the user has granted permission to external storage by using    public boolean isStoragePermissionGranted         String TAG    Storage Permission       if  Build VERSION SDK INT  gt   23            if  this 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           public void saveImageBitmap Bitmap image bitmap  String image name        String root   Environment getExternalStorageDirectory   toString        if  isStoragePermissionGranted         check or ask permission         File myDir   new File root    saved images            if   myDir exists                  myDir mkdirs                      String fname    Image-    image name     jpg           File file   new File myDir  fname           if  file exists                  file delete                      try               file createNewFile       if file already exists will do nothing             FileOutputStream out   new FileOutputStream file               image bitmap compress Bitmap CompressFormat JPEG  90  out               out flush                out close               catch  Exception e                e printStackTrace                       MediaScannerConnection scanFile this  new String   file toString     new String   file getName     null             and of course  add in the AndroidManifest xml    lt uses-permission android name  android permission WRITE EXTERNAL STORAGE    gt

User · Answer

For API level 23  Marshmallow  and later  additional to uses-permission in manifest  pop up permission should also be implemented  and user needs to grant it while using the app in run-time   Below  there is an example to save hello world  as content of myFile txt file in Test directory inside picture directory   In the manifest    lt uses-permission android name  android permission READ EXTERNAL STORAGE    gt   lt uses-permission android name  android permission WRITE EXTERNAL STORAGE    gt    Where you want to create the file   int permission   ActivityCompat checkSelfPermission MainActivity this  Manifest permission WRITE EXTERNAL STORAGE    String   PERMISSIONS STORAGE    Manifest permission READ EXTERNAL STORAGE  Manifest permission WRITE EXTERNAL STORAGE    if  permission    PackageManager PERMISSION GRANTED         ActivityCompat requestPermissions MainActivity this PERMISSIONS STORAGE  1      File myDir   new File Environment getExternalStoragePublicDirectory Environment DIRECTORY PICTURES    Test     myDir mkdirs     try        String FILENAME    myFile txt       File file   new File  myDir  FILENAME       String string    hello world        FileOutputStream fos   new FileOutputStream file       fos write string getBytes         fos close        catch  IOException e        e printStackTrace

User · Answer

This code is Working great  amp  Worked on KitKat as well  Appreciate  RajaReddy PolamReddy Added few more steps here and also Visible on Gallery as well   public void SaveOnClick View v   File mainfile  String fpath        try     i e  v2 My view to save on own folder              v2 setDrawingCacheEnabled true     Your final bitmap according to my code          bitmap tmp   v2 getDrawingCache     File getExternalFilesDir Environment DIRECTORY PICTURES  File separator   MyFolder               Random random new Random              int ii 100000            ii random nextInt ii             String fname  MyPic    ii     jpg               File direct   new File Environment getExternalStorageDirectory       MyFolder                 if   direct exists                      File wallpaperDirectory   new File   sdcard MyFolder                     wallpaperDirectory mkdirs                               mainfile   new File new File   sdcard MyFolder     fname               if  mainfile exists                      mainfile delete                                 FileOutputStream fileOutputStream          fileOutputStream   new FileOutputStream mainfile            bitmap tmp compress CompressFormat JPEG  100  fileOutputStream           Toast makeText MyActivity this getApplicationContext     Saved in Gallery     Toast LENGTH LONG  show            fileOutputStream flush            fileOutputStream close            fpath mainfile toString            galleryAddPic fpath         catch FileNotFoundException e           e printStackTrace          catch  IOException e               TODO Auto-generated catch block         e printStackTrace               This is Media scanner to Visible in Gallery   private void galleryAddPic String fpath        Intent mediaScanIntent   new Intent  android intent action MEDIA SCANNER SCAN FILE        File f   new File fpath       Uri contentUri   Uri fromFile f       mediaScanIntent setData contentUri       this sendBroadcast mediaScanIntent

User · Answer

Click Here for full description and source code  public void saveImage Context mContext  Bitmap bitmapImage       File sampleDir   new File Environment getExternalStorageDirectory            ApplicationName       TextView tvImageLocation    TextView  findViewById R id tvImageLocation     tvImageLocation setText  Image Store At       sampleDir      if   sampleDir exists            createpathForImage mContext  bitmapImage  sampleDir       else         createpathForImage mContext  bitmapImage  sampleDir

User · Answer

You need a permission for this   lt uses-permission android name  android permission WRITE EXTERNAL STORAGE   gt    and method   public boolean saveImageOnExternalData String filePath  byte   fileData         boolean isFileSaved   false      try           File f   new File filePath           if  f exists                f delete            f createNewFile            FileOutputStream fos   new FileOutputStream f           fos write fileData           fos flush            fos close            isFileSaved   true             File Saved       catch  FileNotFoundException e            System out println  FileNotFoundException            e printStackTrace          catch  IOException e            System out println  IOException            e printStackTrace              return isFileSaved         File Not Saved

User · Answer

Probably exception is thrown because there is no MediaCard subdir  You should check if all dirs in the path exist   About visibility of your files  if you put file named  nomedia in your dir you are telling Android that you don t want it to scan it for media files and they will not appear in the gallery

[android] Android saving file to external storage

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