error with setPixels

Question

i am trying to edit images. but i am getting errors with setPixels.

        picw = pic.getWidth();
        pich = pic.getHeight();
        picsize = picw*pic         


        

Answer 1

Most probably your pic is immutable. By default, any bitmap created from drawable would be immutable.

If you need to modify an existing bitmap, you should do following:

// Create a bitmap of the same size
Bitmap newBmp = Bitmap.createBitmap(pic.getWidth(), pic.getHeight(), Config.ARGB);
// Create a canvas  for new bitmap
Canvas c = new Canvas(newBmp); 

// Draw your old bitmap on it. 
c.drawBitmap(pic, 0, 0, new Paint());

Answer 2

It's simple, just use the following command to change it to a mutable Bitmap:

myBitmap = myBitmap.copy( Bitmap.Config.ARGB_8888 , true);

Now the Bitmap myBitmap is replaced by the same Bitmap but this time is mutable

You can also choose another way of storing Pixels (ARGB_8888 etc..): https://developer.android.com/reference/android/graphics/Bitmap.Config.html

Answer 3

I was facing this problem and finally fixed after long time.

public static void filterApply(Filter filter){
    Bitmap bitmcopy = PhotoModel.getInstance().getPhotoCopyBitmap();
    //custom scalling is important to apply filter otherwise it will not apply on image
    Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmcopy, bitmcopy.getWidth()-1, bitmcopy.getHeight()-1, false);
    filter.processFilter(scaledBitmap);
    filterImage.setImageBitmap(scaledBitmap);
}

Answer 4

I had the same problem. Use to fix it:

BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inMutable = true;
Bitmap bitmap = BitmapFactory.decodeResource( getResources(), R.drawable.my_bitmap, opt );

Answer 5

I think your Bitmap is not mutable (see setPixel()'s documentation).

If so, create a mutable copy of this Bitmap (using Bitmap.copy(Bitmap.Config config, boolean isMutable) as an example) and work on this one.