Android Crop Center of Bitmap

Question

I have bitmaps which are squares or rectangles  I take the shortest side and do something like this   int value   0  if  bitmap getHeight    lt   bitmap getWidth          value   bitmap getHeight      else       value   bitmap getWidth       Bitmap finalBitmap   null  finalBitmap   Bitmap createBitmap bitmap  0  0  value  value     Then I scale it to a 144 x 144 Bitmap using this   Bitmap lastBitmap   null  lastBitmap   Bitmap createScaledBitmap finalBitmap  144  144  true     Problem is that it crops the top left corner of the original bitmap  Anyone has the code to crop the center of the bitmap

User · Answer

public Bitmap getResizedBitmap Bitmap bm        int width   bm getWidth        int height   bm getHeight         int narrowSize   Math min width  height       int differ    int Math abs  bm getHeight   - bm getWidth    2 0f       width     width     narrowSize    0   differ      height    width    0    differ   0       Bitmap resizedBitmap   Bitmap createBitmap bm  width  height  narrowSize  narrowSize       bm recycle        return resizedBitmap

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public static Bitmap resizeAndCropCenter Bitmap bitmap  int size  boolean recycle        int w   bitmap getWidth        int h   bitmap getHeight        if  w    size  amp  amp  h    size  return bitmap         scale the image so that the shorter side equals to the target         the longer side will be center-cropped      float scale    float  size   Math min w   h       Bitmap target   Bitmap createBitmap size  size  getConfig bitmap        int width   Math round scale   bitmap getWidth         int height   Math round scale   bitmap getHeight         Canvas canvas   new Canvas target       canvas translate  size - width    2f   size - height    2f       canvas scale scale  scale       Paint paint   new Paint Paint FILTER BITMAP FLAG   Paint DITHER FLAG       canvas drawBitmap bitmap  0  0  paint       if  recycle  bitmap recycle        return target     private static Bitmap Config getConfig Bitmap bitmap        Bitmap Config config   bitmap getConfig        if  config    null            config   Bitmap Config ARGB 8888            return config

User · Answer

While most of the above answers provide a way to do this  there is already a built-in way to accomplish this and it s 1 line of code  ThumbnailUtils extractThumbnail     int dimension   getSquareCropDimensionForBitmap bitmap   bitmap   ThumbnailUtils extractThumbnail bitmap  dimension  dimension           I added this method because people keep asking how    to calculate the dimensions of the bitmap   see comments below public int getSquareCropDimensionForBitmap Bitmap bitmap          use the smallest dimension of the image to crop to     return Math min bitmap getWidth    bitmap getHeight         If you want the bitmap object to be recycled  you can pass options that make it so   bitmap   ThumbnailUtils extractThumbnail bitmap  dimension  dimension  ThumbnailUtils OPTIONS RECYCLE INPUT     From  ThumbnailUtils Documentation     public static Bitmap extractThumbnail  Bitmap source  int width  int   height       Added in API level 8 Creates a centered bitmap of the desired size       Parameters source original bitmap source width    targeted width   height    targeted height   I was getting out of memory errors sometimes when using the accepted answer  and using ThumbnailUtils resolved those issues for me   Plus  this is much cleaner and more reusable

User · Answer

Probably the easiest solution so far   public static Bitmap cropCenter Bitmap bmp        int dimension   Math min bmp getWidth    bmp getHeight         return ThumbnailUtils extractThumbnail bmp  dimension  dimension       imports   import android media ThumbnailUtils  import java lang Math  import android graphics Bitmap

User · Answer

Have you considered doing this from the layout xml   You could set for your ImageView the ScaleType to android scaleType  centerCrop  and set the dimensions of the image in the ImageView inside the layout xml

User · Answer

You can used following code that can solve your problem   Matrix matrix   new Matrix    matrix postScale 0 5f  0 5f   Bitmap croppedBitmap   Bitmap createBitmap bitmapOriginal  100  100 100  100  matrix  true     Above method do postScalling of image before cropping  so you can get best result with cropped image without getting OOM error    For more detail you can refer this blog

User · Answer

Here a more complete snippet that crops out the center of an  bitmap  of arbitrary dimensions and scales the result to your desired  IMAGE SIZE   So you will always get a   croppedBitmap  scaled square of the image center with a fixed size  ideal for thumbnailing and such   Its a more complete combination of the other solutions   final int IMAGE SIZE   255  boolean landscape   bitmap getWidth    gt  bitmap getHeight     float scale factor  if  landscape  scale factor    float IMAGE SIZE   bitmap getHeight    else scale factor    float IMAGE SIZE   bitmap getWidth    Matrix matrix   new Matrix    matrix postScale scale factor  scale factor    Bitmap croppedBitmap  if  landscape       int start    tempBitmap getWidth   - tempBitmap getHeight      2      croppedBitmap   Bitmap createBitmap tempBitmap  start  0  tempBitmap getHeight    tempBitmap getHeight    matrix  true     else       int start    tempBitmap getHeight   - tempBitmap getWidth      2      croppedBitmap   Bitmap createBitmap tempBitmap  0  start  tempBitmap getWidth    tempBitmap getWidth    matrix  true

User · Answer

To correct  willsteel solution   if  landscape                   int start    tempBitmap getWidth   - tempBitmap getHeight      2                  croppedBitmap   Bitmap createBitmap tempBitmap  start  0  tempBitmap getHeight    tempBitmap getHeight    matrix  true                 else                   int start    tempBitmap getHeight   - tempBitmap getWidth      2                  croppedBitmap   Bitmap createBitmap tempBitmap  0  start  tempBitmap getWidth    tempBitmap getWidth    matrix  true

User · Answer

This can be achieved with   Bitmap createBitmap source  x  y  width  height   if  srcBmp getWidth    gt   srcBmp getHeight        dstBmp   Bitmap createBitmap       srcBmp        srcBmp getWidth   2 - srcBmp getHeight   2       0       srcBmp getHeight          srcBmp getHeight             else     dstBmp   Bitmap createBitmap       srcBmp       0        srcBmp getHeight   2 - srcBmp getWidth   2       srcBmp getWidth         srcBmp getWidth

[android] Android Crop Center of Bitmap

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