Save bitmap to location

Question

I am working on a function to download an image from a web server  display it on the screen  and if the user wishes to keep the image  save it on the SD card in a certain folder  Is there an easy way to take a bitmap and just save it to the SD card in a folder of my choice   My issue is that I can download the image  display it on screen as a Bitmap  The only way I have been able to find to save an image to a particular folder is to use FileOutputStream  but that requires a byte array  I am not sure how to convert  if this is even the right way  from Bitmap to byte array  so I can use a FileOutputStream to write the data   The other option I have is to use MediaStore    MediaStore Images Media insertImage getContentResolver    bm      barcodeNumber     jpg Card Image   barcodeNumber     jpg Card Image      Which works fine to save to SD card  but does not allow you to customize the folder

User · Answer

I know this question is old  but now we can achieve the same result without WRITE EXTERNAL STORAGE permission  Instead of we can use File provider  private fun storeBitmap bitmap  Bitmap  file  File           requireContext   getUriForFile file   run               requireContext   contentResolver openOutputStream this   run                   bitmap compress Bitmap CompressFormat JPEG  100  this                  close                                  How to retrieve file from provider   fun Context getUriForFile file  File   Uri            return FileProvider getUriForFile              this               quot  packageName fileprovider quot               file                  Also do not forget register your provider in Android manifest  lt provider         android name  quot androidx core content FileProvider quot          android authorities  quot   applicationId  fileprovider quot          android exported  quot false quot          android grantUriPermissions  quot true quot  gt           lt meta-data             android name  quot android support FILE PROVIDER PATHS quot              android resource  quot  xml file paths quot   gt       lt  provider gt

User · Answer

Hey just give the name to  bmp  Do this   ByteArrayOutputStream bytes   new ByteArrayOutputStream     bitmapScaled compress Bitmap CompressFormat PNG  40  bytes      you can create a new file name  test BMP  in sdcard folder  File f   new File Environment getExternalStorageDirectory                             File separator      test bmp       it ll sound that IM JUST FOOLING AROUND  but try it once it ll get saved in bmp foramt  Cheers

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Here is the sample code for saving bitmap to file    public static File savebitmap Bitmap bmp  throws IOException       ByteArrayOutputStream bytes   new ByteArrayOutputStream        bmp compress Bitmap CompressFormat JPEG  60  bytes       File f   new File Environment getExternalStorageDirectory                 File separator    testimage jpg        f createNewFile        FileOutputStream fo   new FileOutputStream f       fo write bytes toByteArray         fo close        return f      Now call this function to save the bitmap to internal memory   File newfile   savebitmap bitmap    I hope it will help you  Happy codeing life

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After Android 4 4 Kitkat  and as of 2017 share of Android 4 4 and less is about 20  and decreasing  it s not possible to save to SD card using File class and getExternalStorageDirectory   method  This method returns your device internal memory and images save visible to every app  You can also save images only private to your app and to be deleted when user deletes your app with openFileOutput   method    Starting with Android 6 0  you can format your SD card as an internal memory but only private to your device  If you format SD car as internal memory  only your device can access or see it s contents  You can save to that SD card using other answers but if you want to use a removable SD card you should read my answer below   You should use Storage Access Framework to get uri to folder onActivityResult method of activity to get folder selected by user  and add retreive persistiable permission to be able to access folder after user restarts the device    Override protected void onActivityResult int requestCode  int resultCode  Intent data        super onActivityResult requestCode  resultCode  data        if  resultCode    RESULT OK                selectDirectory   invoked         if  requestCode    REQUEST FOLDER ACCESS                 if  data getData      null                    Uri treeUri   data getData                    tvSAF setText  Dir      data getData   toString                     currentFolder   treeUri toString                    saveCurrentFolderToPrefs                        grantUriPermission getPackageName    treeUri                     Intent FLAG GRANT READ URI PERMISSION                      Intent FLAG GRANT WRITE URI PERMISSION                    final int takeFlags   data getFlags                            amp   Intent FLAG GRANT READ URI PERMISSION   Intent FLAG GRANT WRITE URI PERMISSION                      Check for the freshest data                  getContentResolver   takePersistableUriPermission treeUri  takeFlags                                      Now  save save folder to shared preferences not to ask user to select folder every time you want to save an image   You should use DocumentFile class to save your image  not File or ParcelFileDescriptor  for more info you can check this thread for saving image to SD card with compress CompressFormat JPEG  100  out   method and DocumentFile classes

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try  FileOutputStream out   new FileOutputStream filename         bmp compress Bitmap CompressFormat PNG  100  out      bmp is your Bitmap instance        PNG is a lossless format  the compression factor  100  is ignored   catch  IOException e        e printStackTrace

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Some formats  like PNG which is lossless  will ignore the quality setting

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You want to save Bitmap to Directory of your Choice  I have made a library ImageWorker that enables the user to load  save and convert bitmaps drawables base64 images   Min SDK - 14  Pre-requisite    Saving files would require WRITE EXTERNAL STORAGE permission  Retrieving files would require READ EXTERNAL STORAGE permission    Saving Bitmap Drawable Base64  ImageWorker to context       directory  ImageWorker        subDirectory  SubDirectory        setFileName  Image        withExtension Extension PNG       save sourceBitmap 85    Loading Bitmap  val bitmap  Bitmap    ImageWorker from context       directory  ImageWorker        subDirectory  SubDirectory        setFileName  Image        withExtension Extension PNG       load     Implementation  Add Dependencies  In Project Level Gradle  allprojects           repositories                               maven   url  https   jitpack io                      In Application Level Gradle  dependencies               implementation  com github ihimanshurawat ImageWorker 0 51          You can read more on https   github com ihimanshurawat ImageWorker blob master README md

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Why not call the Bitmap compress method with 100  which sounds like it is lossless

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Bitmap bbicon   bbicon BitmapFactory decodeResource getResources   R drawable bannerd10     ByteArrayOutputStream baosicon   new ByteArrayOutputStream      bbicon compress Bitmap CompressFormat PNG 0  baosicon     bicon baosicon toByteArray     String extStorageDirectory   Environment getExternalStorageDirectory   toString    OutputStream outStream   null  File file   new File extStorageDirectory   er PNG    try       outStream   new FileOutputStream file       bbicon compress Bitmap CompressFormat PNG  100  outStream       outStream flush        outStream close      catch Exception e

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outStream   new FileOutputStream file     will throw exception without permission in AndroidManifest xml  at least in os2 2     lt uses-permission android name  android permission WRITE EXTERNAL STORAGE   gt

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You should use the Bitmap compress   method to save a Bitmap as a file  It will compress  if the format used allows it  your picture and push it into an OutputStream   Here is an example of a Bitmap instance obtained through getImageBitmap myurl  that can be compressed as a JPEG with a compression rate of 85        Assume block needs to be inside a Try Catch block  String path   Environment getExternalStorageDirectory   toString    OutputStream fOut   null  Integer counter   0  File file   new File path   FitnessGirl  counter   jpg       the File to save   append increasing numeric counter to prevent files from getting overwritten  fOut   new FileOutputStream file    Bitmap pictureBitmap   getImageBitmap myurl      obtaining the Bitmap pictureBitmap compress Bitmap CompressFormat JPEG  85  fOut      saving the Bitmap to a file compressed as a JPEG with 85  compression rate fOut flush       Not really required fOut close       do not forget to close the stream  MediaStore Images Media insertImage getContentResolver   file getAbsolutePath   file getName   file getName

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The way I found to send PNG and transparency   String file path   Environment getExternalStorageDirectory   getAbsolutePath                           CustomDir   File dir   new File file path   if  dir exists      dir mkdirs     String format   new SimpleDateFormat  yyyyMMddHHmmss          java util Locale getDefault    format new Date      File file   new File dir  format     png    FileOutputStream fOut  try           fOut   new FileOutputStream file           yourbitmap compress Bitmap CompressFormat PNG  85  fOut           fOut flush            fOut close           catch  Exception e            e printStackTrace        Uri uri   Uri fromFile file        Intent intent   new Intent android content Intent ACTION SEND   intent setType  image      intent putExtra android content Intent EXTRA SUBJECT       intent putExtra android content Intent EXTRA TEXT       intent putExtra Intent EXTRA STREAM  uri    startActivity Intent createChooser intent  Sharing something

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Inside onActivityResult   String filename    pippo png   File sd   Environment getExternalStorageDirectory    File dest   new File sd  filename    Bitmap bitmap    Bitmap data getExtras   get  data    try        FileOutputStream out   new FileOutputStream dest        bitmap compress Bitmap CompressFormat PNG  90  out        out flush         out close      catch  Exception e         e printStackTrace

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Make sure the directory is created before you call bitmap compress    new File FileName substring 0 FileName lastIndexOf        mkdirs

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Create a PNG File from Bitmap    void devImjFylFnc String pthAndFylTtlVar  Bitmap iptBmjVar        try               FileOutputStream fylBytWrtrVar   new FileOutputStream pthAndFylTtlVar           iptBmjVar compress Bitmap CompressFormat PNG  100  fylBytWrtrVar           fylBytWrtrVar close              catch  Exception errVar    errVar printStackTrace                  Get Bimap from File    Bitmap getBmjFrmFylFnc String pthAndFylTtlVar        return BitmapFactory decodeFile pthAndFylTtlVar

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Create a video thumbnail for a video  It may return null if the video is corrupted or the format is not supported   private void makeVideoPreview         Bitmap thumbnail   ThumbnailUtils createVideoThumbnail videoAbsolutePath  MediaStore Images Thumbnails MINI KIND       saveImage thumbnail       To Save your bitmap in sdcard use the following code  Store Image  private void storeImage Bitmap image        File pictureFile   getOutputMediaFile        if  pictureFile    null            Log d TAG                   Error creating media file  check storage permissions        e getMessage             return             try           FileOutputStream fos   new FileOutputStream pictureFile           image compress Bitmap CompressFormat PNG  90  fos           fos close          catch  FileNotFoundException e            Log d TAG   File not found      e getMessage           catch  IOException e            Log d TAG   Error accessing file      e getMessage                 To Get the Path for Image Storage      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                 getApplicationContext   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

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Some new devices don t save bitmap So I explained a little more     make sure you have added below Permission   lt uses-permission android name  android permission WRITE EXTERNAL STORAGE    gt       and create a xml file under xml folder name provider paths xml     lt  xml version  1 0  encoding  utf-8   gt   lt paths gt       lt external-path         name  external files          path       gt   lt  paths gt    and  in AndroidManifest under    lt provider             android name  android support v4 content FileProvider              android authorities    applicationId  provider              android exported  false              android grantUriPermissions  true  gt               lt meta-data                 android name  android support FILE PROVIDER PATHS                  android resource   xml provider paths   gt           lt  provider gt    then simply call saveBitmapFile passYourBitmapHere   public static void saveBitmapFile Bitmap bitmap  throws IOException           File mediaFile   getOutputMediaFile            FileOutputStream fileOutputStream   new FileOutputStream mediaFile           bitmap compress Bitmap CompressFormat JPEG  getQualityNumber bitmap   fileOutputStream           fileOutputStream flush            fileOutputStream close            where  File getOutputMediaFile             File mediaStorageDir   new File                  Environment getExternalStorageDirectory                     easyTouchPro            if  mediaStorageDir isDirectory                      Create a media file name             String timeStamp   new SimpleDateFormat  yyyyMMdd HHmmss                        format Calendar getInstance   getTime                 String mCurrentPath   mediaStorageDir getPath     File separator                                IMG     timeStamp     jpg               File mediaFile   new File mCurrentPath               return mediaFile            else       error handling for PIE devices               mediaStorageDir delete                mediaStorageDir mkdirs                galleryAddPic mediaStorageDir                return  getOutputMediaFile                       and other methods  public static int getQualityNumber Bitmap bitmap            int size   bitmap getByteCount            int percentage   0           if  size  gt  500000  amp  amp  size  lt   800000                percentage   15            else if  size  gt  800000  amp  amp  size  lt   1000000                percentage   20            else if  size  gt  1000000  amp  amp  size  lt   1500000                percentage   25            else if  size  gt  1500000  amp  amp  size  lt   2500000                percentage   27            else if  size  gt  2500000  amp  amp  size  lt   3500000                percentage   30            else if  size  gt  3500000  amp  amp  size  lt   4000000                percentage   40            else if  size  gt  4000000  amp  amp  size  lt   5000000                percentage   50            else if  size  gt  5000000                percentage   75                     return percentage          and  void galleryAddPic File f            Intent mediaScanIntent   new Intent                   android intent action MEDIA SCANNER SCAN FILE            Uri contentUri   Uri fromFile f           mediaScanIntent setData contentUri            this sendBroadcast mediaScanIntent

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Save Bitmap to your Gallery Without Compress   private File saveBitMap Context context  Bitmap Final bitmap        File pictureFileDir   new File Environment getExternalStoragePublicDirectory Environment DIRECTORY PICTURES    Your Folder Name        if   pictureFileDir exists              boolean isDirectoryCreated   pictureFileDir mkdirs            if   isDirectoryCreated              Log i  TAG    Can t create directory to save the image            return null            String filename   pictureFileDir getPath     File separator   System currentTimeMillis       jpg       File pictureFile   new File filename       try           pictureFile createNewFile            FileOutputStream oStream   new FileOutputStream pictureFile           Final bitmap compress Bitmap CompressFormat PNG  100  oStream           oStream flush            oStream close            Toast makeText Full Screen Activity this   Save Image Successfully     Toast LENGTH SHORT  show          catch  IOException e            e printStackTrace            Log i  TAG    There was an issue saving the image               scanGallery context  pictureFile getAbsolutePath         return pictureFile    private void scanGallery Context cntx  String path        try           MediaScannerConnection scanFile cntx  new String   path   null  new MediaScannerConnection OnScanCompletedListener                 public void onScanCompleted String path  Uri uri                    Toast makeText Full Screen Activity this   Save Image Successfully     Toast LENGTH SHORT  show                                    catch  Exception e            e printStackTrace            Log i  TAG    There was an issue scanning gallery

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I would also like to save a picture  But my problem    is that I want to save it from a bitmap that ive drawed    I made it like this     Override  public boolean onOptionsItemSelected MenuItem item                switch  item getItemId                  case R id save sign                         myView save                    break                             return false              public void save                 String filename              Date date   new Date 0               SimpleDateFormat sdf   new SimpleDateFormat   yyyyMMddHHmmss                filename    sdf format date                try                   String path   Environment getExternalStorageDirectory   toString                     OutputStream fOut   null                   File file   new File path    DCIM Signatures   filename   jpg                     fOut   new FileOutputStream file                     mBitmap compress Bitmap CompressFormat JPEG  85  fOut                    fOut flush                     fOut close                      MediaStore Images Media insertImage getContentResolver                     file getAbsolutePath   file getName   file getName                   catch  Exception e                    e printStackTrace

[android] Save bitmap to location

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