private Bitmap getimage(String srcPath) {BitmapFactory.Options newOpts = new BitmapFactory.Options();// 开始读入图片，此时把options.inJustDecodeBounds 设回true了newOpts.inJustDecodeBounds = true;Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);// 此时返回bm为空newOpts.inJustDecodeBounds = false;int w = newOpts.outWidth;int h = newOpts.outHeight;// 现在主流手机比较多是800*480分辨率，所以高和宽我们设置为float hh = 100f;// 这里设置高度为800ffloat ww = 100f;// 这里设置宽度为480f// 缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可int be = 1;// be=1表示不缩放if (w > h && w > ww) {// 如果宽度大的话根据宽度固定大小缩放be = (int) (newOpts.outWidth / ww);} else if (w < h && h > hh) {// 如果高度高的话根据宽度固定大小缩放be = (int) (newOpts.outHeight / hh);}if (be <= 0)be = 1;newOpts.inSampleSize = be;// 设置缩放比例// 重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了bitmap = BitmapFactory.decodeFile(srcPath, newOpts);return compressImage(bitmap);// 压缩好比例大小后再进行质量压缩}

private Bitmap compressImage(Bitmap image) {ByteArrayOutputStream baos = new ByteArrayOutputStream();image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中int options = 100;while (baos.toByteArray().length / 1024 > 100) { // 循环判断如果压缩后图片是否大于100kb,大于继续压缩baos.reset();// 重置baos即清空baosimage.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%，把压缩后的数据存放到baos中options -= 10;// 每次都减少10}ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把压缩后的数据baos存放到ByteArrayInputStream中Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片return bitmap;}

public byte[] Bitmap2Bytes(Bitmap bm) {ByteArrayOutputStream baos = new ByteArrayOutputStream();bm.compress(Bitmap.CompressFormat.PNG, 100, baos);return baos.toByteArray();}

/*** 格式化byte* * @param b* @return*/public static String byte2hex(byte[] b) {char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A','B', 'C', 'D', 'E', 'F' };char[] out = new char[b.length * 2];for (int i = 0; i < b.length; i++) {byte c = b[i];out[i * 2] = Digit[(c >>> 4) & 0X0F];out[i * 2 + 1] = Digit[c & 0X0F];}return new String(out);}

/*** 反格式化byte* * @param s* @return*/public static byte[] hex2byte(String s) {byte[] src = s.toLowerCase().getBytes();byte[] ret = new byte[src.length / 2];for (int i = 0; i < src.length; i += 2) {byte hi = src[i];byte low = src[i + 1];hi = (byte) ((hi >= 'a' && hi <= 'f') ? 0x0a + (hi - 'a'): hi - '0');low = (byte) ((low >= 'a' && low <= 'f') ? 0x0a + (low - 'a'): low - '0');ret[i / 2] = (byte) (hi << 4 | low);}return ret;}

public Bitmap Bytes2Bimap(byte[] b) {if (b.length != 0) {return BitmapFactory.decodeByteArray(b, 0, b.length);} else {return null;}}