Android实现图片转二进制流及二进制转字符串
我就废话不多说了,还是直接看代码吧
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public static byte[] readStream(String imagepath) throws Exception { FileInputStream fs = new FileInputStream(imagepath); ByteArrayOutputStream outStream = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while (-1 != (len = fs.read(buffer))) { outStream.write(buffer, 0, len); } outStream.close(); fs.close(); return outStream.toByteArray(); } // 二进制转字符串 public static String byte2hex(byte[] b) { StringBuffer sb = new StringBuffer(); String tmp = ""; for (int i = 0; i < b.length; i++) { tmp = Integer.toHexString(b[i] & 0XFF); if (tmp.length() == 1){ sb.append("0" + tmp); }else{ sb.append(tmp); } } return sb.toString(); }
补充知识:图片(bitmap)转化为byte[],并上传到服务器
压缩为3:1bitmap
/** * 压缩bitmap * * @param bitmap * @return */ private Bitmap compressBitmap(Bitmap bitmap) { // 创建操作图片用的matrix对象 Matrix matrix = new Matrix(); matrix.postScale((float) 300 / bitmap.getWidth(), (float) 100 / bitmap.getHeight()); Log.e("", "bitmap_width" + bitmap.getWidth()); Log.e("", "bitmap_height" + bitmap.getHeight()); Bitmap compressBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); return compressBitmap; }
上传压缩后的bitmap
private void eleSignature() { WritePadDialog writeTabletDialog = new WritePadDialog( this, new DialogListener() { public void refreshActivity(Object object) { Bitmap mSignBitmap = (Bitmap) object; mSignBitmap = compressBitmap(mSignBitmap); // Bitmap newsrcImage = mSignBitmap.copy(Bitmap.Config.RGB_565, true); saveBmp(mSignBitmap); Log.e("", "after bitmap_width:" + mSignBitmap.getWidth()); Log.e("", "after bitmap_height:" + mSignBitmap.getHeight()); File file = new File(file_name); Log.e("Jeny", "file.exists():" + file.exists()); if (!file.exists()) { return; } byte[] eleSignatureData = null; try { eleSignatureData = InputStreamTOByte(); } catch (IOException e) { } Log.e("Jeny", "eleSignatureData:" + eleSignatureData.length); if (eleSignatureData == null) { return; } // byte[] eleSignatureData = InputStreamTOByte(); // byte[] eleSignatureData = Bitmap2Bytes(newsrcImage); mController.startSavingElecSignatureDataOfSDPay(SalesCollectActivity.this, voucherNo, eleSignatureData); mSignBitmap.recycle(); } } ); writeTabletDialog.setCanceledOnTouchOutside(false); writeTabletDialog.setOnKeyListener(new DialogInterface.OnKeyListener() { @Override public boolean onKey(DialogInterface dialogInterface, int keyCode, KeyEvent keyEvent) { if (keyCode == KeyEvent.KEYCODE_BACK) { return true; } else { return false; //默认返回 false } } }); writeTabletDialog.show(); } /** * 将InputStream转换成byte数组 * * InputStream * * @return byte[] * @throws IOException */ @SuppressWarnings("resource") public byte[] InputStreamTOByte() throws IOException { File file = new File(file_name); if (!file.exists()) { return null; } FileInputStream is = new FileInputStream(file_name); ByteArrayOutputStream outStream = new ByteArrayOutputStream(); byte[] data = new byte[BUFFER_SIZE]; int count = -1; while ((count = is.read(data, 0, BUFFER_SIZE)) != -1) outStream.write(data, 0, count); // data = null; byte[] alldata = outStream.toByteArray(); /**top = new byte[62]; for (int i = 0; i < 62; i++) { top[i] = alldata[i]; } writefile(top_name, top); */ // byte[] other = new byte[alldata.length - 62]; // for (int i = 0; i < (alldata.length - 62); i++) // { // other[i] = alldata[i + 62]; // } /* * String b = * Environment.getExternalStorageDirectory().getPath()+"/other.txt"; * writefile(b, other); */ return alldata; } /** * @param bitmap 图片以bmp格式存储的方法 */ private void saveBmp(Bitmap bitmap) { if (bitmap == null) return; // 位图大小 int nBmpWidth = bitmap.getWidth(); int nBmpHeight = bitmap.getHeight(); int DataSizePerLine = 40; // 图像数据大小 int bufferSize = nBmpHeight * DataSizePerLine; try { // 存储文件名 File file = new File(file_name); Log.i("SurFace", "filename:" + file_name); if (!file.exists()) { file.createNewFile(); } FileOutputStream fileos = new FileOutputStream(file_name); // bmp文件头 int bfType = 0x4d42; long bfSize = 14 + 40 + 8 + bufferSize; int bfReserved1 = 0; int bfReserved2 = 0; long bfOffBits = 14 + 40 + 8; // 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 = 1; 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); // 调色板 byte[] c = new byte[4]; c[0] = 0; c[1] = 0; c[2] = 0; c[3] = 0; fileos.write(c); byte[] w = new byte[4]; w[0] = (byte) 255; w[1] = (byte) 255; w[2] = (byte) 255; w[3] = 0; fileos.write(w); int wWidth = DataSizePerLine; // 像素扫描 byte bmpData[] = new byte[bufferSize]; for (int ibuf = 0; ibuf < bufferSize; ibuf++) bmpData[ibuf] = (byte) 0xff; int iByte = 0; int iCount = 0; byte bPix = 0; for (int nCol = nBmpHeight - 1, nRealCol = nBmpHeight; nCol > 0; nCol--, nRealCol--) { wWidth = DataSizePerLine; iCount = 0; iByte = 0; for (int wRow = 0; wRow < nBmpWidth; wRow++) { int clr = bitmap.getPixel(wRow, nCol); int r = (clr | 0xff00ffff) >> 16 & 0x00ff; int g = Color.green(clr); int b = Color.blue(clr); // byte a = (byte) Color.blue(clr); // byte b = (byte) Color.green(clr); // byte d = (byte) Color.red(clr); // System.out.println("r:"+r); if (r != 255 || g != 255 || b != 255)// 黑色 { // bPix = (byte)(bPix & (0x7f>>iByte | // 0x7f<<(8-iByte))); bPix = (byte) (bPix & ~(byte) Math.pow(2, iByte)); // System.out.println( " 黑色 " + bPix ); } else { // bPix = (byte)(bPix & (0xff>>iByte | // 0xff<<(8-iByte))); bPix = (byte) (bPix | (byte) Math.pow(2, iByte)); // System.out.println( " 白色 " + bPix); } if (iCount != 0 && iCount % 8 == 0) { bmpData[nRealCol * wWidth - wRow / 8] = bPix; iByte = 0; } else { iByte++; } iCount++; /* * //if(a==b && b==d && a>0) if (nRealCol%2 == 0) { //为白色 * bmpData[nRealCol * wWidth] = (byte)255; }else{ //为黑色 * bmpData[nRealCol * wWidth] = 0; } */ // Arrays.fill(x, value); /* * bmpData[nRealCol * wWidth + wByteIdex] = (byte) Color .b; * bmpData[nRealCol * wWidth + wByteIdex + 1] = (byte) Color * .green(clr); bmpData[nRealCol * wWidth + wByteIdex + 2] = * (byte) Color .red(clr); */ } } // System.out.println( " iCount= " + iCount); /* * byte[] writeByte = new byte[bmpData.length]; for(int * i=0;i> 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); } /** * 压缩bitmap * * @param bitmap * @return */ private Bitmap compressBitmap(Bitmap bitmap) { // 创建操作图片用的matrix对象 Matrix matrix = new Matrix(); matrix.postScale((float) 300 / bitmap.getWidth(), (float) 100 / bitmap.getHeight()); Log.e("", "bitmap_width" + bitmap.getWidth()); Log.e("", "bitmap_height" + bitmap.getHeight()); Bitmap compressBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); return compressBitmap; }
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