I tried Josip’s answer but wouldn’t work for me, regardless of whether the offset parameter was 1 or 0 – the drawn bitmap just appeared in original colour. However, this did work: // You have to copy the bitmap as any bitmaps loaded as drawables are immutable Bitmap bm = ImageLoader.getInstance().loadImageSync(“drawable://” + drawableId, o) .copy(Bitmap.Config.ARGB_8888, … Read more
It is possible to do without using unsafe code by using Bitmap.LockBits and copy the pixels from the BitmapSource straight to the Bitmap Bitmap GetBitmap(BitmapSource source) { Bitmap bmp = new Bitmap( source.PixelWidth, source.PixelHeight, PixelFormat.Format32bppPArgb); BitmapData data = bmp.LockBits( new Rectangle(Point.Empty, bmp.Size), ImageLockMode.WriteOnly, PixelFormat.Format32bppPArgb); source.CopyPixels( Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride); bmp.UnlockBits(data); return bmp; }
I found 2 variants of the solution. Both involve saving Bitmap to storage, but the image will not appear in the gallery. First variant: Saving to external storage but to private folder of the app. for API <= 18 it requires permission, for newer it does not. 1. Setting permissions Add into AndroidManifest.xml before tag … Read more
You can use copyPixelsToBuffer() to move the pixel data to a Buffer, or you can use getPixels() and then convert the integers to bytes with bit-shifting. copyPixelsToBuffer() is probably what you’ll want to use, so here is an example on how you can use it: //b is the Bitmap //calculate how many bytes our image … Read more
try this one : public class CustomImageView extends ImageView { public static float radius = 18.0f; public CustomImageView(Context context) { super(context); } public CustomImageView(Context context, AttributeSet attrs) { super(context, attrs); } public CustomImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } @Override protected void onDraw(Canvas canvas) { //float radius = 36.0f; Path clipPath … Read more
NOTE: this is a bit old code. for the most updated one, check out the project page on github. jni/Android.mk LOCAL_PATH := $(call my-dir) #bitmap operations module include $(CLEAR_VARS) LOCAL_MODULE := JniBitmapOperations LOCAL_SRC_FILES := JniBitmapOperations.cpp LOCAL_LDLIBS := -llog LOCAL_LDFLAGS += -ljnigraphics include $(BUILD_SHARED_LIBRARY) APP_OPTIM := debug LOCAL_CFLAGS := -g #if you need to add more … Read more
This should do what you need it to. It will fill the entire bitmap with the specified color. Bitmap Bmp = new Bitmap(width, height); using (Graphics gfx = Graphics.FromImage(Bmp)) using (SolidBrush brush = new SolidBrush(Color.FromArgb(redvalue, greenvalue, bluevalue))) { gfx.FillRectangle(brush, 0, 0, width, height); }
Advice depends upon what you are trying to do. If you are concerned that your controls take a long time to draw, and you want to draw to a bitmap so you can blit the bitmap rather than re-drawing via a canvas, then you don’t want to be double-guessing the platform – controls automatically cache … Read more
I believe that when the LRUCache evicts an image to make room for another one, the memory is not being freed. It won’t be, until the Bitmap is recycled or garbage-collected. A quick google search reveals that this is happening because the image which is displaying has been recycled. Which is why you should not … Read more
If you just want the Bitmap from a ImageView the following code may work for you:- Bitmap bm=((BitmapDrawable)imageView.getDrawable()).getBitmap(); Try having the image in all drawable qualities folders (drawable-hdpi/drawable-ldpi etc.) Could be that the emulator or device your using has a different density and is trying to pull images from another folder. If you are using … Read more