// 油画效果
public static Bitmap changeToOil(Bitmap bitmap) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();

int dst[] = new int[width * height];
bitmap.getPixels(dst, 0, width, 0, 0, width, height);

int color = 0;
Random random = new Random();
int iModel = 4;
int i = width - iModel;
int pos = 0, iPos;

while (i > 1) {
int j = height - iModel;
while (j > 1) {
iPos = random.nextInt(100000000) % iModel;
pos = (j + iPos) * width + (i + iPos);
color = dst[pos];
pos = j * width + i;
dst[pos] = color;
j--;
}
i--;
}

Bitmap returnBitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.RGB_565);
returnBitmap.setPixels(dst, 0, width, 0, 0, width, height);
return returnBitmap;
}