Android(安卓)Bitmap保存为.bmp格式，图像转化为黑白图片

/**  * 把一个View的对象转换成bitmap  */static Bitmap getViewBitmap(View v) {v.clearFocus();v.setPressed(false);//能画缓存就返回false boolean willNotCache = v.willNotCacheDrawing();v.setWillNotCacheDrawing(false);int color = v.getDrawingCacheBackgroundColor();v.setDrawingCacheBackgroundColor(0);if (color != 0) {v.destroyDrawingCache();}v.buildDrawingCache();Bitmap cacheBitmap = v.getDrawingCache();if (cacheBitmap == null) {Log.e("BtPrinter", "failed getViewBitmap(" + v + ")", new RuntimeException());return null;}Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);// Restore the view v.destroyDrawingCache();v.setWillNotCacheDrawing(willNotCache);v.setDrawingCacheBackgroundColor(color);return bitmap;}/*** 将彩色图转换为黑白图* * @param 位图* @return 返回转换好的位图*/public static Bitmap convertToBlackWhite(Bitmap bmp) {int width = bmp.getWidth(); // 获取位图的宽int height = bmp.getHeight(); // 获取位图的高int[] pixels = new int[width * height]; // 通过位图的大小创建像素点数组bmp.getPixels(pixels, 0, width, 0, 0, width, height);int alpha = 0xFF << 24;for (int i = 0; i < height; i++) {for (int j = 0; j < width; j++) {int grey = pixels[width * i + j];int red = ((grey & 0x00FF0000) >> 16);int green = ((grey & 0x0000FF00) >> 8);int blue = (grey & 0x000000FF);grey = (int) (red * 0.3 + green * 0.59 + blue * 0.11);grey = alpha | (grey << 16) | (grey << 8) | grey;pixels[width * i + j] = grey;}}Bitmap newBmp = Bitmap.createBitmap(width, height, Config.RGB_565);newBmp.setPixels(pixels, 0, width, 0, 0, width, height);Bitmap resizeBmp = ThumbnailUtils.extractThumbnail(newBmp, 380, 460);return resizeBmp;}/** * 将Bitmap存为 .bmp格式图片 * @param bitmap */private void saveBmp(Bitmap bitmap) {if (bitmap == null)return;// 位图大小int nBmpWidth = bitmap.getWidth();int nBmpHeight = bitmap.getHeight();// 图像数据大小int bufferSize = nBmpHeight * (nBmpWidth * 3 + nBmpWidth % 4);try {// 存储文件名String filename = "/sdcard/test.bmp";File file = new File(filename);if (!file.exists()) {file.createNewFile();}FileOutputStream fileos = new FileOutputStream(filename);// bmp文件头int bfType = 0x4d42;long bfSize = 14 + 40 + bufferSize;int bfReserved1 = 0;int bfReserved2 = 0;long bfOffBits = 14 + 40;// 保存bmp文件头writeWord(fileos, bfType);writeDword(fileos, bfSize);writeWord(fileos, bfReserved1);writeWord(fileos, bfReserved2);writeDword(fileos, bfOffBits);// bmp信息头long biSize = 40L;long biWidth = nBmpWidth;long biHeight = nBmpHeight;int biPlanes = 1;int biBitCount = 24;long biCompression = 0L;long biSizeImage = 0L;long biXpelsPerMeter = 0L;long biYPelsPerMeter = 0L;long biClrUsed = 0L;long biClrImportant = 0L;// 保存bmp信息头writeDword(fileos, biSize);writeLong(fileos, biWidth);writeLong(fileos, biHeight);writeWord(fileos, biPlanes);writeWord(fileos, biBitCount);writeDword(fileos, biCompression);writeDword(fileos, biSizeImage);writeLong(fileos, biXpelsPerMeter);writeLong(fileos, biYPelsPerMeter);writeDword(fileos, biClrUsed);writeDword(fileos, biClrImportant);// 像素扫描byte bmpData[] = new byte[bufferSize];int wWidth = (nBmpWidth * 3 + nBmpWidth % 4);for (int nCol = 0, nRealCol = nBmpHeight - 1; nCol < nBmpHeight; ++nCol, --nRealCol)for (int wRow = 0, wByteIdex = 0; wRow < nBmpWidth; wRow++, wByteIdex += 3) {int clr = bitmap.getPixel(wRow, nCol);bmpData[nRealCol * wWidth + wByteIdex] = (byte) Color.blue(clr);bmpData[nRealCol * wWidth + wByteIdex + 1] = (byte) Color.green(clr);bmpData[nRealCol * wWidth + wByteIdex + 2] = (byte) Color.red(clr);}fileos.write(bmpData);fileos.flush();fileos.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}protected void writeWord(FileOutputStream stream, int value) throws IOException {byte[] b = new byte[2];b[0] = (byte) (value & 0xff);b[1] = (byte) (value >> 8 & 0xff);stream.write(b);}protected void writeDword(FileOutputStream stream, long value) throws IOException {byte[] b = new byte[4];b[0] = (byte) (value & 0xff);b[1] = (byte) (value >> 8 & 0xff);b[2] = (byte) (value >> 16 & 0xff);b[3] = (byte) (value >> 24 & 0xff);stream.write(b);}protected void writeLong(FileOutputStream stream, long value) throws IOException {byte[] b = new byte[4];b[0] = (byte) (value & 0xff);b[1] = (byte) (value >> 8 & 0xff);b[2] = (byte) (value >> 16 & 0xff);b[3] = (byte) (value >> 24 & 0xff);stream.write(b);}
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