How to convert a Drawable to a Bitmap

Question

I would like to set a certain Drawable as the device s wallpaper  but all wallpaper functions accept Bitmaps only  I cannot use WallpaperManager because I m pre 2 1   Also  my drawables are downloaded from the web and do not reside in R drawable

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A Drawable can be drawn onto a Canvas  and a Canvas can be backed by a Bitmap    Updated to handle a quick conversion for BitmapDrawables and to ensure that the Bitmap created has a valid size   public static Bitmap drawableToBitmap  Drawable drawable        if  drawable instanceof BitmapDrawable            return   BitmapDrawable drawable  getBitmap               int width   drawable getIntrinsicWidth        width   width  gt  0   width   1      int height   drawable getIntrinsicHeight        height   height  gt  0   height   1       Bitmap bitmap   Bitmap createBitmap width  height  Bitmap Config ARGB 8888       Canvas canvas   new Canvas bitmap        drawable setBounds 0  0  canvas getWidth    canvas getHeight         drawable draw canvas        return bitmap

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Maybe this will help someone     From PictureDrawable to Bitmap  use    private Bitmap pictureDrawableToBitmap PictureDrawable pictureDrawable        Bitmap bmp   Bitmap createBitmap pictureDrawable getIntrinsicWidth    pictureDrawable getIntrinsicHeight    Config ARGB 8888        Canvas canvas   new Canvas bmp        canvas drawPicture pictureDrawable getPicture          return bmp           implemented as such    Bitmap bmp   pictureDrawableToBitmap  PictureDrawable  drawable

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Use this code it will help you for achieving your goal    Bitmap bmp BitmapFactory decodeResource getResources    R drawable profileimage       if  bmp  null            Bitmap bitmap round getRoundedShape bmp           if  bitmap round  null                profileimage setImageBitmap bitmap round                      public Bitmap getRoundedShape Bitmap scaleBitmapImage        int targetWidth   100      int targetHeight   100      Bitmap targetBitmap   Bitmap createBitmap targetWidth               targetHeight Bitmap Config ARGB 8888        Canvas canvas   new Canvas targetBitmap       Path path   new Path        path addCircle   float  targetWidth - 1    2                float  targetHeight - 1    2               Math min   float  targetWidth                          float  targetHeight     2                       Path Direction CCW        canvas clipPath path       Bitmap sourceBitmap   scaleBitmapImage      canvas drawBitmap sourceBitmap               new Rect 0  0  sourceBitmap getWidth                        sourceBitmap getHeight                          new Rect 0  0  targetWidth  targetHeight   new Paint Paint FILTER BITMAP FLAG        return targetBitmap

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So after looking  and using  of the other answers  seems they all handling ColorDrawable and PaintDrawable badly   Especially on lollipop  seemed that Shaders were tweaked so solid blocks of colors were not handled correctly   I am using the following code now   public static Bitmap drawableToBitmap Drawable drawable        if  drawable instanceof BitmapDrawable            return   BitmapDrawable  drawable  getBitmap                  We ask for the bounds if they have been set as they would be most        correct  then we check we are   gt  0     final int width    drawable getBounds   isEmpty                 drawable getBounds   width     drawable getIntrinsicWidth         final int height    drawable getBounds   isEmpty                 drawable getBounds   height     drawable getIntrinsicHeight            Now we check we are  gt  0     final Bitmap bitmap   Bitmap createBitmap width  lt   0   1   width  height  lt   0   1   height              Bitmap Config ARGB 8888       Canvas canvas   new Canvas bitmap       drawable setBounds 0  0  canvas getWidth    canvas getHeight         drawable draw canvas        return bitmap      Unlike the others  if you call setBounds on the Drawable before asking to turn it into a bitmap  it will draw the bitmap at the correct size

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METHOD 1   Either you can directly convert to bitmap like this  Bitmap myLogo   BitmapFactory decodeResource context getResources    R drawable my drawable     METHOD 2   You can even convert the resource into the drawable and from that you can get bitmap like this   Bitmap myLogo     BitmapDrawable getResources   getDrawable R drawable logo   getBitmap      For API   22  getDrawable method moved to the ResourcesCompat class so for that you do something like this  Bitmap myLogo     BitmapDrawable  ResourcesCompat getDrawable context getResources    R drawable logo  null   getBitmap

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1  Drawable to Bitmap   Bitmap mIcon   BitmapFactory decodeResource context getResources   R drawable icon      mImageView setImageBitmap mIcon    2  Bitmap to Drawable    Drawable mDrawable   new BitmapDrawable getResources    bitmap      mImageView setDrawable mDrawable

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Here is the nice Kotlin version of the answer provided by  Chris Jenkins here  https   stackoverflow com a 27543712 1016462  fun Drawable toBitmap    Bitmap     if  this is BitmapDrawable        return bitmap        val width   if  bounds isEmpty  intrinsicWidth else bounds width     val height   if  bounds isEmpty  intrinsicHeight else bounds height      return Bitmap createBitmap width nonZero    height nonZero    Bitmap Config ARGB 8888  also       val canvas   Canvas it      setBounds 0  0  canvas width  canvas height      draw canvas         private fun Int nonZero     if  this  lt   0  1 else this

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Android provides a non straight foward solution  BitmapDrawable  To get the Bitmap   we ll have to provide the resource id R drawable flower pic to the  a BitmapDrawable and then cast it to a Bitmap    Bitmap bm     BitmapDrawable  getResources   getDrawable R drawable flower pic   getBitmap

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ImageWorker Library can convert bitmap to drawable or base64 and vice versa    val bitmap  Bitmap    ImageWorker convert   drawableToBitmap sourceDrawable    Implementation  In Project Level Gradle  allprojects           repositories                               maven   url  https   jitpack io                      In Application Level Gradle  dependencies               implementation  com github 1AboveAll ImageWorker 0 51          You can also store and retrieve bitmaps drawables base64 images from external   Check here  https   github com 1AboveAll ImageWorker edit master README md

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The latest androidx core library  androidx core core-ktx 1 2 0  now has an extension function  Drawable toBitmap      to convert a Drawable to a Bitmap

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get image path from gallery protected void onActivityResult int requestCode  int resultcode  Intent intent        super onActivityResult requestCode  resultcode  intent        if  requestCode    1            if  intent    null  amp  amp  resultcode    RESULT OK                             Uri selectedImage   intent getData                 String   filePathColumn    MediaStore Images Media DATA               Cursor cursor   getContentResolver   query selectedImage  filePathColumn  null  null  null               cursor moveToFirst                int columnIndex   cursor getColumnIndex filePathColumn 0                filePath   cursor getString columnIndex                  display image using BitmapFactory              cursor close    bmp   BitmapFactory decodeFile filepath                iv setBackgroundResource 0               iv setImageBitmap bmp

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This piece of code helps   Bitmap icon   BitmapFactory decodeResource context getResources                                               R drawable icon resource     Here a version where the image gets downloaded   String name   c getString str url   URL url value   new URL name   ImageView profile    ImageView v findViewById R id vdo icon   if  profile    null        Bitmap mIcon1           BitmapFactory decodeStream url value openConnection   getInputStream         profile setImageBitmap mIcon1

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public static Bitmap drawableToBitmap  Drawable drawable        Bitmap bitmap   null       if  drawable instanceof BitmapDrawable            BitmapDrawable bitmapDrawable    BitmapDrawable  drawable          if bitmapDrawable getBitmap      null                return bitmapDrawable getBitmap                         if drawable getIntrinsicWidth    lt   0    drawable getIntrinsicHeight    lt   0            bitmap   Bitmap createBitmap 1  1  Bitmap Config ARGB 8888      Single color bitmap will be created of 1x1 pixel       else           bitmap   Bitmap createBitmap drawable getIntrinsicWidth    drawable getIntrinsicHeight    Bitmap Config ARGB 8888              Canvas canvas   new Canvas bitmap       drawable setBounds 0  0  canvas getWidth    canvas getHeight         drawable draw canvas       return bitmap

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very simple    Bitmap tempBMP   BitmapFactory decodeResource getResources   R drawable image

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Bitmap bitmap   BitmapFactory decodeResource context getResources    R drawable icon    This will not work every time for example if your drawable is layer list drawable then it gives a null response  so as an alternative you need to draw your drawable into canvas then save as bitmap  please refer below a cup of code  public void drawableToBitMap Context context  int drawable  int widthPixels  int heightPixels        try           File file   new File Environment getExternalStoragePublicDirectory Environment DIRECTORY DOWNLOADS     quot   quot    quot drawable png quot            FileOutputStream fOut   new FileOutputStream file           Drawable drw   ResourcesCompat getDrawable context getResources    drawable  null           if  drw    null                convertToBitmap drw  widthPixels  heightPixels  compress Bitmap CompressFormat PNG  100  fOut                     fOut flush            fOut close          catch  Exception e            e printStackTrace             private Bitmap convertToBitmap Drawable drawable  int widthPixels  int heightPixels        Bitmap bitmap   Bitmap createBitmap widthPixels  heightPixels  Bitmap Config ARGB 8888       Canvas canvas   new Canvas bitmap       drawable setBounds 0  0  widthPixels  heightPixels       drawable draw canvas       return bitmap     above code save you re drawable as drawable png in the download directory

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Here is better resolution  public static Bitmap drawableToBitmap  Drawable drawable        if  drawable instanceof BitmapDrawable            return   BitmapDrawable drawable  getBitmap               Bitmap bitmap   Bitmap createBitmap drawable getIntrinsicWidth    drawable getIntrinsicHeight    Config ARGB 8888       Canvas canvas   new Canvas bitmap        drawable setBounds 0  0  canvas getWidth    canvas getHeight         drawable draw canvas        return bitmap     public static InputStream bitmapToInputStream Bitmap bitmap        int size   bitmap getHeight     bitmap getRowBytes        ByteBuffer buffer   ByteBuffer allocate size       bitmap copyPixelsToBuffer buffer       return new ByteArrayInputStream buffer array         Code from How to read drawable bits as InputStream

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This converts a BitmapDrawable to a Bitmap   Drawable d   ImagesArrayList get 0     Bitmap bitmap     BitmapDrawable d  getBitmap

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if you are using kotlin the use below code  it ll work     for using image path  val image   Drawable createFromPath path  val bitmap    image as BitmapDrawable  bitmap

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android-ktx has Drawable toBitmap method  https   android github io android-ktx core-ktx androidx graphics drawable android graphics drawable -drawable to-bitmap html  From Kotlin  val bitmap   myDrawable toBitmap

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BitmapFactory decodeResource   automatically scales the bitmap  so your bitmap may turn out fuzzy  To prevent scaling  do this   BitmapFactory Options options   new BitmapFactory Options    options inScaled   false  Bitmap source   BitmapFactory decodeResource context getResources                                                 R drawable resource name  options     or  InputStream is   context getResources   openRawResource R drawable resource name  bitmap   BitmapFactory decodeStream is

[android] How to convert a Drawable to a Bitmap?

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