从蓝牙的输入流中获取图像的字节数组

Question

我想通过蓝牙从硬件接收 android 中的 jpeg 图像。 我想读取输入流并显示字节数组中的实际数据。 我的实际数据如下：

ff d8 ff e1 63 70 45 78 69 66 00 00 49 49 2a 00
08 00 00 00 0b 00 0f 01 02 00 06 00 00 00 92 00
.........................ff d9

我使用了这个代码：

 void openBT() throws IOException
{
    UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); //Standard SerialPortService ID
    mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);        
    mmSocket.connect();
    mmOutputStream = mmSocket.getOutputStream();
    mmInputStream = mmSocket.getInputStream();


    beginListenForData();
    //ConnectedThread(mmSocket);
    myLabel.setText("Bluetooth Opened");


}


void beginListenForData()
{
    final Handler handler = new Handler(); 
    final byte delimiter = 10; //This is the ASCII code for a newline character

    stopWorker = false;
    readBufferPosition = 0;
    readBuffer = new byte[1024];
    workerThread = new Thread(new Runnable()
    {
        public void run()
        {                
           while(!Thread.currentThread().isInterrupted() && !stopWorker)
           {
                try 
                {
                    int bytesAvailable = mmInputStream.available();                        
                    if(bytesAvailable > 0)
                    {
                        final byte[] packetBytes = new byte[bytesAvailable];
                        mmInputStream.read(packetBytes);

                        StringBuilder sb = new StringBuilder();
                        for (byte b : packetBytes) {
                            sb.append(String.format("%02X ", b)).append(" ");//there's no need to mask it with 0xFF. Don't forget to leave a " " between bytes so you may distinguish them.
                        }
                        Log.d("data","data"+sb.toString());


                        handler.post(new Runnable()
                        {
                            public void run()
                            {
                                //ByteArrayInputStream imageStream = new ByteArrayInputStream( packetBytes);
                               // Bitmap bitmap = BitmapFactory.decodeStream(imageStream);
                               // image.setImageBitmap(bitmap);
                            }
                        });
                    }


                } 
                catch (IOException ex) 
                {
                    stopWorker = true;
                }
           }
        }
    });

    workerThread.start();


}

我得到的是：

6163206339203564203264203138203...........
463206620666620643920

如何在logcat中显示实际结果（十六进制值），然后从十六进制值显示jpg图像？？

我使用以下代码从相机发送 jpg 图像数据： 主.cpp http://pastebin.com/Tx8YkbYF JPEGCamera.cpp http://pastebin.com/0jHQ8WvT

Answer 1

（1）如何在logcat中显示实际结果（十六进制值）？

由于您已经有了字节值，您只需根据 HEX 基数格式化这些值。 String.format("%02X ", ...) 会很好：

final byte[] packetBytes = new byte[bytesAvailable];
mmInputStream.read(packetBytes);

StringBuilder sb = new StringBuilder();
for (byte b : bytes) {
    sb.append(String.format("%02X ", b)).append(" ");//there's no need to mask it with 0xFF. Don't forget to leave a " " between bytes so you may distinguish them.
}
Log.d("data: " + sb.toString());

(2) 然后从十六进制值显示jpg图片？？

如果您确定这些字节是 JPEG 编码图像的字节，您可以将它们原样解码为位图：

ImageView imageView = ...; //load image view defined in xml file
Bitmap bitmap = BitmapFactory.decodeByteArray(packetBytes, 0 , packetBytes.length);
imageView.setImageBitmap(bitmap);