Android load from URL to Bitmap

Question

I have a question about loading an image from a website  The code I use is   Display display   getWindowManager   getDefaultDisplay     int width   display getWidth    int height   display getHeight    Bitmap bit null  try       bit   BitmapFactory decodeStream  InputStream new URL  http   www mac-wallpapers com bulkupload wallpapers Apple 20Wallpapers apple-black-logo-wallpaper jpg   getContent       catch  Exception e     Bitmap sc   Bitmap createScaledBitmap bit width height true   canvas drawBitmap sc 0 0 null     But it always returns a null pointer exception and the program crashes out  The URL is valid  and it seems to work for everyone else  I m using 2 3 1

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public static Bitmap getBitmapFromURL String src        try           URL url   new URL src           HttpURLConnection connection    HttpURLConnection  url openConnection            connection setDoInput true           connection connect            InputStream input   connection getInputStream            Bitmap myBitmap   BitmapFactory decodeStream input           return myBitmap        catch  IOException e               Log exception         return null

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Its Working in Pie OS Use this       Override     protected void onCreate             super onCreate              setNotificationBadge             if  android os Build VERSION SDK INT  gt   9                StrictMode ThreadPolicy policy   new StrictMode ThreadPolicy Builder   permitAll   build                StrictMode setThreadPolicy policy                             BottomNavigationView bottomNavigationView    BottomNavigationView  findViewById R id navigation           Menu menu   bottomNavigationView getMenu            MenuItem userImage   menu findItem R id navigation download           userImage setTitle  Login             runOnUiThread new Runnable                  Override             public void run                     try                        URL url   new URL  https   rukminim1 flixcart com image 832 832 jmux18w0 mobile b g n mi-redmi-6-mzb6387in-original-imaf9z8eheryfbsu jpeg q 70                        Bitmap myBitmap   BitmapFactory decodeStream url openConnection   getInputStream                          Log e  keshav    Bitmap     myBitmap                       userImage setIcon new BitmapDrawable getResources    myBitmap                       catch  IOException e                        Log e  keshav    Exception     e getMessage

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Try this   AQuery aq   new AQuery getActivity                 aq id view findViewById R id image   image imageUrl  true  true  0   0                      new BitmapAjaxCallback                              Override                         public void callback String url  ImageView iv  Bitmap bm  AjaxStatus status                               iv setImageBitmap bm                                                   header  User-Agent    android

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I Prefer these one   Creates Bitmap from InputStream and returns it       public static  Bitmap downloadImage String url            Bitmap bitmap   null          InputStream stream   null          BitmapFactory Options bmOptions   new BitmapFactory Options            bmOptions inSampleSize   1           try               stream   getHttpConnection url               bitmap   BitmapFactory decodeStream stream  null  bmOptions               stream close                      catch  IOException e1                e1 printStackTrace                System out println  downloadImage   e1 toString                       return bitmap              Makes HttpURLConnection and returns InputStream   public static  InputStream getHttpConnection String urlString   throws IOException            InputStream stream   null          URL url   new URL urlString           URLConnection connection   url openConnection             try               HttpURLConnection httpConnection    HttpURLConnection  connection              httpConnection setRequestMethod  GET                httpConnection connect                 if  httpConnection getResponseCode      HttpURLConnection HTTP OK                    stream   httpConnection getInputStream                                    catch  Exception ex                ex printStackTrace                System out println  downloadImage    ex toString                       return stream          REMEMBER            Android includes two HTTP clients  HttpURLConnection and Apache HTTP Client      For Gingerbread and later  HttpURLConnection is the best choice           From Android 3 x Honeycomb or later  you cannot perform Network IO on the UI thread and doing this throws android os NetworkOnMainThreadException  You must use Asynctask instead as shown below              AsyncTAsk for Image Bitmap         private class AsyncGettingBitmapFromUrl extends AsyncTask lt String  Void  Bitmap gt               Override         protected Bitmap doInBackground String    params                 System out println  doInBackground                 Bitmap bitmap   null               bitmap   AppMethods downloadImage params 0                 return bitmap                      Override         protected void onPostExecute Bitmap bitmap                 System out println  bitmap    bitmap

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Use Kotlin Coroutines to Handle Threading  The reason the code is crashing is because the Bitmap is attempting to be created on the Main Thread which is not allowed since it may cause Android Not Responding  ANR  errors   Concepts Used   Kotlin Coroutines notes  The Loading  Content  Error  LCE  pattern is used below  If interested you can learn more about it in this talk and video  LiveData is used to return the data  I ve compiled my favorite LiveData resource in these notes  In the bonus code  toBitmap   is a Kotlin extension function requiring that library to be added to the app dependencies    Implementation  Code  1  Create Bitmap in a different thread then the Main Thread   In this sample using Kotlin Coroutines the function is being executed in the Dispatchers IO thread which is meant for CPU based operations  The function is prefixed with suspend which is a Coroutine syntax   Bonus - After the Bitmap is created it is also compressed into an ByteArray so it can be passed via an Intent later outlined in this full sample   Repository kt  suspend fun bitmapToByteArray url  String    withContext Dispatchers IO        MutableLiveData lt Lce lt ContentResult ContentBitmap gt  gt    apply           postValue Lce Loading            postValue Lce Content ContentResult ContentBitmap              ByteArrayOutputStream   apply                   try                                            BitmapFactory decodeStream URL url  openConnection   apply                           doInput   true                         connect                         getInputStream                      catch  e  IOException                       postValue Lce Error ContentResult ContentBitmap ByteArray 0    bitmapToByteArray error or null -   e localizedMessage                         null                    compress CompressFormat JPEG  BITMAP COMPRESSION QUALITY  this               toByteArray                            ViewModel kt    Calls bitmapToByteArray from the Repository private fun bitmapToByteArray url  String    liveData       emitSource switchMap repository bitmapToByteArray url     lce - gt          when  lce                is Lce Loading - gt  liveData                is Lce Content - gt  liveData                   emit Event ContentResult ContentBitmap lce packet image  lce packet errorMessage                              is Lce Error - gt  liveData                   Crashlytics log Log WARN  LOG TAG                           bitmapToByteArray error or null -   lce packet errorMessage                                       Bonus - Convert ByteArray back to Bitmap   Utils kt  fun ByteArray byteArrayToBitmap context  Context        run           BitmapFactory decodeByteArray this  BITMAP OFFSET  size  run               if  this    null  this                In case the Bitmap loaded was empty or there is an error I have a default Bitmap to return              else AppCompatResources getDrawable context  ic coinverse 48dp   toBitmap

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public Drawable loadImageFromURL String url  String name        try           InputStream is    InputStream  new URL url  getContent            Drawable d   Drawable createFromStream is  name           return d        catch  Exception e            return null

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Glide with context       load  http   test com yourimage jpg          asBitmap                                          fitCenter        into new SimpleTarget lt Bitmap gt  100 100               Override           public void onResourceReady Bitmap bitmap  GlideAnimation lt   super Bitmap gt  glideAnimation                   do something with you bitmap                   bitmap

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If you load URL from bitmap without using AsyncTask  write two lines after setContentView R layout abc    StrictMode ThreadPolicy policy   new StrictMode ThreadPolicy Builder   permitAll   build            StrictMode setThreadPolicy policy    try       URL url   new URL  http               Bitmap image   BitmapFactory decodeStream url openConnection   getInputStream       catch IOException e        System out println e

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If you are using Picasso for Images you can try method below   public static Bitmap getImageBitmapFromURL Context context  String imageUrl       Bitmap imageBitmap   null      try         imageBitmap   new AsyncTask lt Void  Void  Bitmap gt               Override         protected Bitmap doInBackground Void    params              try               int targetHeight   200              int targetWidth   200               return Picasso with context  load String valueOf imageUrl                    resize targetWidth  targetHeight                 placeholder R drawable raw image                 error R drawable raw error image                 get                catch  IOException e                e printStackTrace                          return null                    execute   get          catch  InterruptedException e          e printStackTrace             return imageBitmap

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very fast way   this method works very quickly   private Bitmap getBitmap String url                 File f fileCache getFile url              from SD cache         Bitmap b   decodeFile f           if b  null              return b             from web         try               Bitmap bitmap null              URL imageUrl   new URL url               HttpURLConnection conn    HttpURLConnection imageUrl openConnection                conn setConnectTimeout 30000               conn setReadTimeout 30000               conn setInstanceFollowRedirects true               InputStream is conn getInputStream                OutputStream os   new FileOutputStream f               Utils CopyStream is  os               os close                bitmap   decodeFile f               return bitmap            catch  Exception ex              ex printStackTrace               return null                         decodes image and scales it to reduce memory consumption     private Bitmap decodeFile File f           try                 decode image size             BitmapFactory Options o   new BitmapFactory Options                o inJustDecodeBounds   true              BitmapFactory decodeStream new FileInputStream f  null o                  Find the correct scale value  It should be the power of 2              final int REQUIRED SIZE 70              int width tmp o outWidth  height tmp o outHeight              int scale 1              while true                   if width tmp 2 lt REQUIRED SIZE    height tmp 2 lt REQUIRED SIZE                      break                  width tmp  2                  height tmp  2                  scale  2                               decode with inSampleSize             BitmapFactory Options o2   new BitmapFactory Options                o2 inSampleSize scale              return BitmapFactory decodeStream new FileInputStream f   null  o2             catch  FileNotFoundException e             return null

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if you are using Glide and Kotlin   Glide with this               asBitmap                load  https                      addListener object   RequestListener lt Bitmap gt                    override fun onLoadFailed                      e  GlideException                       model  Any                       target  Target lt Bitmap gt                        isFirstResource  Boolean                    Boolean                       Toast makeText this MainActivity   failed      e  printStackTrace    Toast LENGTH SHORT  show                       return false                                    override fun onResourceReady                      resource  Bitmap                       model  Any                       target  Target lt Bitmap gt                        dataSource  DataSource                       isFirstResource  Boolean                    Boolean                         image is ready  you can get bitmap here                     var bitmap   resource                     return false                                                into imageView

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Follow method to get url to bitmap in android just pass link of this image and get bitmap   public static Bitmap getBitmapFromURL String imgUrl        try           URL url   new URL imgUrl           HttpURLConnection connection    HttpURLConnection  url openConnection            connection setDoInput true           connection connect            InputStream input   connection getInputStream            Bitmap myBitmap   BitmapFactory decodeStream input           return myBitmap        catch  IOException e               Log exception         return null

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Pass your Image URL    Try this   private Bitmap getBitmap String url                 File file fileCache getFile url           Bitmap bm   decodeFile file           if bm  null               return bm          try               Bitmap bitmap null              URL ImageUrl   new URL url               HttpURLConnection conn    HttpURLConnection ImageUrl openConnection                conn setConnectTimeout 50000               conn setReadTimeout 50000               conn setInstanceFollowRedirects true               InputStream is   conn getInputStream                OutputStream os   new FileOutputStream file               Utils CopyStream is  os               os close                bitmap   decodeFile file               return bitmap            catch  Exception ex              ex printStackTrace               return null                      private Bitmap decodeFile File file           try               BitmapFactory Options opt   new BitmapFactory Options                opt inJustDecodeBounds   true              BitmapFactory decodeStream new FileInputStream file  null opt               final int REQUIRED SIZE 70              int width tmp opt outWidth  height tmp opt outHeight              int scale 1              while true                   if width tmp 2 lt REQUIRED SIZE    height tmp 2 lt REQUIRED SIZE                      break                  width tmp  2                  height tmp  2                  scale  2                            BitmapFactory Options opte   new BitmapFactory Options                opte inSampleSize scale              return BitmapFactory decodeStream new FileInputStream file   null  opte             catch  FileNotFoundException e             return null          Create Class Utils   public class Utils       public static void CopyStream InputStream is  OutputStream os                final int buffer size 1024          try                       byte   bytes new byte buffer size               for                                 int count is read bytes  0  buffer size                 if count  -1                    break                os write bytes  0  count                                   catch Exception ex

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If you are using Picasso or Glide or Universal-Image-Loader for load image from url  You can simply get the loaded bitmap by  For Picasso   current version 2 71828   Java code  Picasso get   load imageUrl  into new Target          Override     public void onBitmapLoaded Bitmap bitmap  Picasso LoadedFrom from               loaded bitmap is here  bitmap              Override     public void onBitmapFailed Drawable errorDrawable            Override     public void onPrepareLoad Drawable placeHolderDrawable           Kotlin code  Picasso get   load url  into object   com squareup picasso Target        override fun onBitmapLoaded bitmap  Bitmap   from  Picasso LoadedFrom                 loaded bitmap is here  bitmap             override fun onPrepareLoad placeHolderDrawable  Drawable           override fun onBitmapFailed e  Exception   errorDrawable  Drawable           For Glide Check How does one use glide to download an image into a bitmap   For Universal-Image-Loader Java code  imageLoader loadImage imageUrl  new SimpleImageLoadingListener           Override     public void onLoadingComplete String imageUri  View view  Bitmap loadedImage                     loaded bitmap is here  loadedImage

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private class AsyncTaskRunner extends AsyncTask lt String  String  String gt        String Imageurl       public AsyncTaskRunner String Imageurl            this Imageurl   Imageurl              Override     protected String doInBackground String    strings             try                URL url   new URL Imageurl               thumbnail r   BitmapFactory decodeStream url openConnection   getInputStream                 catch  IOException e                      return null              Override     protected void onPostExecute String s            super onPostExecute s             imgDummy setImageBitmap thumbnail r           UtilityMethods tuchOn relProgress             Call asynctask like    AsyncTaskRunner asyncTaskRunner   new AsyncTaskRunner uploadsModel getImages             asyncTaskRunner execute

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This method will do the trick with kotlin coroutine so it won t block the UI Main thread  amp  will return resized circle bitmap image like profile image   private var image  Bitmap    null  private fun getBitmapFromURL src  String         CoroutineScope Job     Dispatchers IO  launch           try               val url   URL src              val bitMap   BitmapFactory decodeStream url openConnection   getInputStream                image   Bitmap createScaledBitmap bitMap  100  100  true            catch  e  IOException                   Log exception

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Please try this following steps   1  Create AsyncTask in class or adapter if you want to change the list item image    public class AsyncTaskLoadImage extends AsyncTask lt String  String  Bitmap gt            private final static String TAG    AsyncTaskLoadImage           private ImageView imageView           public AsyncTaskLoadImage ImageView imageView                this imageView   imageView                      Override         protected Bitmap doInBackground String    params                Bitmap bitmap   null              try                   URL url   new URL params 0                    bitmap   BitmapFactory decodeStream  InputStream  url getContent                   catch  IOException e                    e printStackTrace                  catch  Exception e                    e printStackTrace                              return bitmap                      Override         protected void onPostExecute Bitmap bitmap                try                   int width  height                  height   bitmap getHeight                    width   bitmap getWidth                     Bitmap bmpGrayscale   Bitmap createBitmap width  height  Bitmap Config ARGB 8888                   Canvas c   new Canvas bmpGrayscale                   Paint paint   new Paint                    ColorMatrix cm   new ColorMatrix                    cm setSaturation 0                   ColorMatrixColorFilter f   new ColorMatrixColorFilter cm                   paint setColorFilter f                   c drawBitmap bitmap  0  0  paint                   imageView setImageBitmap bmpGrayscale                 catch  Exception e                    e printStackTrace                                    2  Call the AsyncTask from your activity  fragment or adapter inside onBindViewHolder    2 a  For adapter       String src   current getProductImage        new AsyncTaskLoadImage holder icon  execute src     2 b  For activity and fragment     Activity      ImageView imagview   ImageView  findViewById R Id imageview     String src    your image string     new AsyncTaskLoadImage imagview  execute src      Fragment      ImageView imagview   ImageView view findViewById R Id imageview     String src    your image string     new AsyncTaskLoadImage imagview  execute src     3  Kindly run the app and check the image    Happy coding

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fun getBitmap url   String     Bitmap        var bmp   Bitmap     null     Picasso get   load url  into object   com squareup picasso Target           override fun onBitmapLoaded bitmap  Bitmap   from  Picasso LoadedFrom                 bmp    bitmap                    override fun onPrepareLoad placeHolderDrawable  Drawable               override fun onBitmapFailed e  Exception   errorDrawable  Drawable                 return bmp     Try this with picasso

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public static Bitmap getImgBitmapFromUri final String url  final Activity context  final CropImageView imageView  final File file        final Bitmap bitmap   null      AsyncTask execute new Runnable              Override         public void run                 try                   Utils image   Glide with context                           load url  asBitmap                            into 100  100  get                  catch  InterruptedException e                    e printStackTrace                  catch  ExecutionException e                    e printStackTrace                              context runOnUiThread new Runnable                      Override                 public void run                         if  imageView    null                          imageView setImageBitmap Utils image                                                           return Utils image      Use Glide library and run the following code in work thread as posted

[java] Android load from URL to Bitmap

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