Android位图蒙版颜色，删除颜色

// start with a Bitmap bmp

// make a mutable copy and a canvas from this mutable bitmap
Bitmap mb = bmp.copy(Bitmap.Config.ARGB_8888, true);
Canvas c = new Canvas(mb);

// get the int for the colour which needs to be removed
Paint p = new Paint();
p.setARGB(255, 255, 0, 0); // ARGB for the color, in this case red
int removeColor = p.getColor(); // store this color\'s int for later use

// Next, set the alpha of the paint to transparent so the color can be removed.
// This could also be non-transparent and be used to turn one color into another color            
p.setAlpha(0);

// then, set the Xfermode of the pain to AvoidXfermode
// removeColor is the color that will be replaced with the pain\'t color
// 0 is the tolerance (in this case, only the color to be removed is targetted)
// Mode.TARGET means pixels with color the same as removeColor are drawn on
p.setXfermode(new AvoidXfermode(removeColor, 0, AvoidXfermode.Mode.TARGET));

// draw transparent on the \"brown\" pixels
c.drawPaint(p);

// mb should now have transparent pixels where they were red before

int[]

Bitmap.createBitmap( int[], int, int, Bitmap.Config )

int [] pixels = ...;

for( int i = 0; i < pixels.length; i++ ) {
    // Invert the red channel as an alpha bitmask for the desired color.
    pixels[i] = ~( pixels[i] << 8 & 0xFF000000 ) & Color.BLACK;
}

Bitmap bitmap = Bitmap.createBitmap( pixels, width, height, Bitmap.Config.ARGB_8888 );

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