LanYan的专栏 - 编程开发

用网上的一个gprinter.jar开发蓝牙与收银机的对接打印，，出现如下错误：x + width must be <= bitmap.width()

zs这一系列的错误都源自于矩阵的检测：

/*** Shared code to check for illegal arguments passed to getPixels()* or setPixels()** @param x left edge of the area of pixels to access* @param y top edge of the area of pixels to access* @param width width of the area of pixels to access* @param height height of the area of pixels to access* @param offset offset into pixels[] array* @param stride number of elements in pixels[] between each logical row* @param pixels array to hold the area of pixels being accessed*/private void checkPixelsAccess(int x, int y, int width, int height,int offset, int stride, int pixels[]) {checkXYSign(x, y);if (width < 0) {throw new IllegalArgumentException("width must be >= 0");}if (height < 0) {throw new IllegalArgumentException("height must be >= 0");}if (x + width > getWidth()) {throw new IllegalArgumentException("x + width must be <= bitmap.width()");}if (y + height > getHeight()) {throw new IllegalArgumentException("y + height must be <= bitmap.height()");}if (Math.abs(stride) < width) {throw new IllegalArgumentException("abs(stride) must be >= width");}int lastScanline = offset + (height – 1) * stride;int length = pixels.length;if (offset < 0 || (offset + width > length)|| lastScanline < 0|| (lastScanline + width > length)) {throw new ArrayIndexOutOfBoundsException();}}研究了哈源代码发现问题出在resizeImage(mBitmap, width, height);这个方法调用里面，原有方法：

public static Bitmap resizeImage(Bitmap bitmap, int w, int h) {Bitmap BitmapOrg = bitmap;int width = BitmapOrg.getWidth();int height = BitmapOrg.getHeight();int newWidth = w;int newHeight = h;float scaleWidth = newWidth / width;float scaleHeight = newHeight / height;Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,height, matrix, true);return resizedBitmap; }这里计算的单位换算 float=int/int>>>float=int*1.0f/int就不会报错了，否则平板上会报错

捕捉最后的流星，坐在最高的山顶上，可以听音乐，聊电影，

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