Android 蓝牙日志记录填写logcat

Question

我使用蓝牙聊天示例作为起点，实现从手机到嵌入式设备的 BT 连接。我能够成功连接到设备，但一旦建立连接，logcat 就会被大量日志记录淹没。当我第一次使用 BT 聊天应用程序电话对电话时，我没有看到这种类型的日志记录。

这是一遍又一遍重复的内容。它基本上使 logcat 无法使用。到目前为止，我还没有找到配置日志记录的方法或者为什么它记录这么多。任何见解将不胜感激。

03-08 14:29:04.941: DEBUG/BluetoothSocket.cpp(11422): availableNative
03-08 14:29:04.957: DEBUG/BluetoothSocket(11422): available
03-08 14:29:04.957: DEBUG/BluetoothSocket.cpp(11422): availableNative
03-08 14:29:04.971: DEBUG/BluetoothSocket(11422): available
03-08 14:29:04.976: DEBUG/BluetoothSocket.cpp(11422): availableNative
03-08 14:29:04.989: DEBUG/BluetoothSocket(11422): available
03-08 14:29:04.991: DEBUG/BluetoothSocket.cpp(11422): availableNative
03-08 14:29:05.016: DEBUG/BluetoothSocket(11422): available
03-08 14:29:05.016: DEBUG/BluetoothSocket.cpp(11422): availableNative
03-08 14:29:05.034: DEBUG/BluetoothSocket(11422): available
03-08 14:29:05.036: DEBUG/BluetoothSocket.cpp(11422): availableNative
03-08 14:29:05.050: DEBUG/BluetoothSocket(11422): available
03-08 14:29:05.051: DEBUG/BluetoothSocket.cpp(11422): availableNative
03-08 14:29:05.066: DEBUG/BluetoothSocket(11422): available
03-08 14:29:05.066: DEBUG/BluetoothSocket.cpp(11422): availableNative
03-08 14:29:05.081: DEBUG/BluetoothSocket(11422): available
03-08 14:29:05.081: DEBUG/BluetoothSocket.cpp(11422): availableNative
03-08 14:29:05.086: DEBUG/(2419): jw_if_rfcomm_cl_cback: jw_if_rfcomm_cl_cback event=BTA_JV_RFCOMM_READ_EVT
03-08 14:29:05.086: DEBUG/(2419): jv_forward_data_to_jni: BTA_JV_RFCOMM_DATA_IND_EVT bta hdl 2
03-08 14:29:05.086: DEBUG/(2419): bts_log_tstamps_us: [update stats] ts    1263504, bta hdl 2, diff 01263504, tx_q 1 (1), rx_q 0 (0)
03-08 14:29:05.086: DEBUG/BLZ20_WRAPPER(11422): blz20_wrp_poll: transp poll : (fd 41) returned r_ev [POLLIN ] (0x1)
03-08 14:29:05.086: DEBUG/BLZ20_WRAPPER(11422): blz20_wrp_poll: return 1
03-08 14:29:05.086: DEBUG/BLZ20_WRAPPER(11422): blz20_wrp_read: read 122 bytes out of 1024 on fd 41
03-08 14:29:05.101: DEBUG/BluetoothSocket(11422): read
03-08 14:29:05.101: DEBUG/BluetoothSocket.cpp(11422): readNative
03-08 14:29:05.101: DEBUG/ASOCKWRP(11422): asocket_read
03-08 14:29:05.106: INFO/BLZ20_WRAPPER(11422): blz20_wrp_poll: nfds 2, timeout -1 ms
03-08 14:29:05.117: DEBUG/BluetoothSocket(11422): available
03-08 14:29:05.121: DEBUG/BluetoothSocket.cpp(11422): availableNative

Answer 1

在使用我的 Arduino 板 + 蓝牙适配器后，我尝试实现 马特·贝尔的博客。问题是以下代码：

//final Handler handler = new Handler();
workerThread = new Thread(new Runnable()
{
    public void run()
    {
        while(!Thread.currentThread().isInterrupted() && !stopWorker)
        {
            try {
                int bytesAvailable = mmInputStream.available();
                if(bytesAvailable > 0)
                {
                    //Log.d(TAG,"bytesAvailable: "+bytesAvailable + " readBufferPosition: "+readBufferPosition);
                    byte[] packetBytes = new byte[bytesAvailable];
                    mmInputStream.read(packetBytes);

                    for(int i=0;i<bytesAvailable;i++)
                    {
                        byte delimiter = 0x0A;     // /n bzw. LF
                        byte b = packetBytes[i];
                        if(b == delimiter)
                        {
                            byte[] encodedBytes = new byte[readBufferPosition];
                            System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
                            final String data = new String(encodedBytes, "US-ASCII");
                            //final String data = new String(readBuffer);
                            readBufferPosition = 0;

                            Log.d(TAG,""+data);

//                                            //The variable data now contains our full command
//                                            handler.post(new Runnable()
//                                            {
//                                                public void run()
//                                                {
//                                                    //myLabel.setText(data);
//                                                    Log.d(TAG,""+data);
//                                                }
//                                            });
                        }
                        else
                        {
                            readBuffer[readBufferPosition++] = b;
                        }
                    }
                }
            } catch (Exception e) {
                Log.d(TAG,"Exeption 2: "+e.getMessage());
                stopWorker = true;
            }
        }
    }
});
workerThread.start();

调用以下函数会导致 logCat 中产生巨大的垃圾邮件

int bytesAvailable = mmInputStream.available();

LogCat:

PS：时间戳实际上是固定版本的。不使用该修复将导致每5ms发送垃圾邮件，从而有效地阻止我的整个日志

03-17 18:43:06.615: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:06.715: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:06.820: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:06.920: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.020: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.120: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.220: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.320: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.420: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.520: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.620: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.725: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.825: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:07.925: VERBOSE/BluetoothSocket.cpp(8871): availableNative
03-17 18:43:08.025: VERBOSE/BluetoothSocket.cpp(8871): availableNative

我当前的修复是在while循环末尾添加以下代码，从而减少垃圾邮件。

try {
Thread.sleep(100);
} catch (Exception e) {
Log.d(TAG,"Exception Thread.sleep()");
}

我希望这能帮助一些有类似问题的人。

编辑：目前我不得不将睡眠计时器减少到 10 毫秒 bam .. SPAM

03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative
03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative
03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative
03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative
03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative
03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative
03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative
03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative
03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative
03-18 15:50:18.470: VERBOSE/BluetoothSocket.cpp(3482): availableNative

Answer 2

这一定是一个错误，而且是一个严重的错误：

• 要么 Logcat 有时只显示此调试打印 - 尽管我的代码总是遇到它

• 或者蓝牙芯片有时会松动...（更有可能）。

只是将日志级别从详细设置为调试不会改变这样一个事实：有大量数据传输到 Logcat，从而阻止了所有正常日志...

Answer 3

我只是偶然发现这一点：三年后，这种日志堵塞仍然存在 - 至少在我的三星 GT-I8190 (4.1.2) 上。

罪魁祸首是 mmInputStream.available()

解决这个问题的一种方法是不使用它的 available() 方法。而不是：

int bytesAvailable = mmInputStream.available();

if(bytesAvailable > 0)
{...

您可以使用类似下面的代码来避免日志堵塞...

int i = -1;
while((i=mmInputStream.read())!=-1)
{                           
  char c=(char)i;

  // you can do your buffering here...
  Log.i("readBT","have char: "+c);
}

下面的代码也适用于具有此讨厌错误的手机。不过，它可能应该进行修改，因为它只是一个快速的解决方案。脏修复：

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 i = -1;
                        while((i=mmInputStream.read())!=-1)
                        {
                           byte b=(byte)i;

                           Log.i("readBT","have byte: " + b);

                           if ( (readBufferPosition >= 1023) || (b == delimiter) )
                           {
                               byte[] encodedBytes = new byte[readBufferPosition];
                               System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
                               final String data = new String(encodedBytes, "UTF-8");
                               readBufferPosition = 0;

                               handler.post(new Runnable()
                               {
                                   public void run()
                                   {
                                       myLabel.setText(data);
                                   }
                               });                             
                           }
                           else
                           {
                               readBuffer[readBufferPosition++] = b;
                           }                           
                        }                       
                    } 
                    catch (IOException ex) 
                    {
                        stopWorker = true;
                    }
               }
            }
        });

        workerThread.start();
    }

Answer 4

“avaliableNative”具有详细优先级。要删除该消息（以及所有详细消息），请使用“*:D”参数作为最后一个 logcat 参数。通过使用软盘图标旁边的组合框中的“调试”优先级，可以在 Eclipse 中实现类似的效果。

Answer 5

在 DDMS 中，您可以使用调试、信息、错误、警告按钮来过滤掉内容，您还可以创建一个特殊的过滤器来仅显示您感兴趣的内容。不要认为有任何蓝牙设置可以关闭该日志记录你可以使用。