OBD-ii读卡器冻结而不是实时

时间:2014-11-11 18:50:11

标签: android regex hex obd-ii

我正在使用OBD-ii Reader。

我使用基本的蓝牙聊天与OBD-ii设备进行通信,使用正则表达式捕获回复并在文本视图中显示它们。

这是我发送PID代码以请求数据的地方:

public void getData(int messagenumber) {

    final TextView TX = (TextView) findViewById(R.id.TXView2); 

    switch(messagenumber) {

        case 1:
            sendMessage("01 2F" + '\r'); //get Fuel %
            TX.setText("01 2F");
            Log.d("Case1: ", String.valueOf(messagenumber));    
            messagenumber++;
            Log.d("Case1: ", String.valueOf(messagenumber));    
            break;
        case 2:
            sendMessage("01 31" + '\r'); //get Mileage
            TX.setText("01 31");
            Log.d("Case2: ", String.valueOf(messagenumber));    
            messagenumber++;
            Log.d("Case2: ", String.valueOf(messagenumber));    
            break;
        case 3:
            sendMessage("01 0C" + '\r'); //get RPM
            TX.setText("01 0C");
            Log.d("Case3: ", String.valueOf(messagenumber));    
            messagenumber++;
            Log.d("Case3: ", String.valueOf(messagenumber));    
            break;

        default: ;       
    }
}

然后在这里获取数据:

        switch (msg.what) {
        case MESSAGE_STATE_CHANGE:
            if(D) Log.i(TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1);
            switch (msg.arg1) {
            case BluetoothChatService.STATE_CONNECTED:
                setStatus(getString(R.string.title_connected_to, mConnectedDeviceName));
                mConversationArrayAdapter.clear();
                break;
            case BluetoothChatService.STATE_CONNECTING:
                setStatus(R.string.title_connecting);
                break;
            case BluetoothChatService.STATE_LISTEN:
            case BluetoothChatService.STATE_NONE:
                setStatus(R.string.title_not_connected);
                break;
            }
            break;
        case MESSAGE_WRITE:
            byte[] writeBuf = (byte[]) msg.obj;
            // construct a string from the buffer
            String writeMessage = new String(writeBuf);

            mConversationArrayAdapter.add("Me:  " + writeMessage);
            break;
        case MESSAGE_READ:
            byte[] readBuf = (byte[]) msg.obj;
            // construct a string from the valid bytes in the buffer               
            String readMessage = new String(readBuf, 0, msg.arg1);
            Log.d("BYTES: ", readMessage);

            // ------- ADDED CODE FOR OBD -------- //      
            dataRecieved = readMessage;
            RX.setText(dataRecieved);



           if((dataRecieved != null) && (dataRecieved.matches("\\s*[0-9A-Fa-f]{2} [0-9A-Fa-f]{2}\\s*\r?\n?" ))) {

                    dataRecieved = dataRecieved.trim();
                    String[] bytes = dataRecieved.split(" ");
                    Log.d("DR 1val: ",dataRecieved + "--!");


                    if((bytes[0] != null)&&(bytes[1] != null)) {

                         PID = Integer.parseInt(bytes[0].trim(), 16);
                         value = Integer.parseInt(bytes[1].trim(), 16); 
                        }


             if (PID == 47) {

            /*case 47: //PID(2F): Fuel % */

                int fuelValue = ((value*100)/255);

                String displayFuel = String.valueOf("PID: " + PID + "Val: " + value + "fuel: " + fuelValue + " %");
                Fuel.setText(displayFuel);
                /*break;
            default: ;*/
             }

        }
        else if((dataRecieved != null) && (dataRecieved.matches("\\s*[0-9A-Fa-f]{2} [0-9A-Fa-f]{2} [0-9A-Fa-f]{2}\\s*\r?\n?" ))) {

            dataRecieved = dataRecieved.trim();
            String[] bytes = dataRecieved.split(" ");
            Log.d("DR 2vals: ",dataRecieved + "--!");



            if((bytes[0] != null)&&(bytes[1] != null)&&(bytes[2] != null)) {

                PID = Integer.parseInt(bytes[0].trim(), 16);
                //if (PID == 12){
                value1 = Integer.parseInt(bytes[1].trim(), 16);
                value2 = Integer.parseInt(bytes[2].trim(), 16);
                /*}
                else if (PID == 49){
                //mileVal = Integer.parseInt(bytes[1].trim(), 16);
                }*/
            }   

                //PID(0C): RPM
            if (PID == 12) { 

                    int RPM_value = ((value1*256)+value2)/4;


                    String displayRPM = String.valueOf("PID: " + PID + "A: " + value1 + " B: " + value2 + "RPM: " + RPM_value);
                    Throttle.setText(displayRPM);

            }
            else if (PID == 49) {


                //PID(31): Distance Travelled   (A*256)+B 

                        int miles = (int) (((value1*256)+value2)*0.62137);

                        //String displayDistance = String.valueOf(miles + " miles");
                        String displayDistance = String.valueOf("PID: " + PID + "A: " + value1 + " B: " + value2 + "Miles: " + miles);
                        Distance.setText(displayDistance);

        }
        }

然后我使用这个正则表达式来听取>这意味着OBD已完成处理命令,然后应该返回到开始并再次请求PID代码。

   else if((dataRecieved != null) && (dataRecieved.matches("\\s*[ .A-Za-z0-9\\?*>\r\n]*\\s*>\\s*\r*\n*" ))) {

            if(message_number == 4){
                message_number = 1;
            }
            getData(message_number++);
        }

当我运行应用程序时,需要很长时间才能开始给我任何值,但它们是准确的。我有从OBD收到的数据的日志。然而,我的日志中出现了一些我不明白的东西。我还注意到显示dataRecieved的textView会显示未知字符并显示STOPPED,然后冻结并在一段时间后再次启动。 这是一些日志...

   D/TextLayoutCache(5146): Cache value 0x520da3b8 deleted, size = 136
   V/BluetoothSocket.cpp(5146): readNative
   D/TextLayoutCache(5146): Cache value 0x4dbd5e00 deleted, size = 176
   V/BluetoothSocket.cpp(5146): readNative
   V/BluetoothSocket.cpp(5146): readNative
   D/TextLayoutCache(5146): Cache value 0x4dfead50 deleted, size = 240
    D/TextLayoutCache(5146): Cache value 0x520dcb10 deleted, size = 240
   V/BluetoothSocket.cpp(5146): readNative
  D/BYTES:(5146): C 
  D/BYTES:(5146): 4 
  D/BYTES:(5146): 4 
  D/BYTES:(5146): 4 

1 个答案:

答案 0 :(得分:0)

这些网站将帮助您开始使用正则表达式:

http://www.rexegg.com/regex-quickstart.html

http://www.cheatography.com/davechild/cheat-sheets/regular-expressions/

当试图理解任何代码时,将其分解为更小的步骤:

dataRecieved = readMessage;

这只是将dataRecieved设置为等于readMessage

\ s代表白色空间,是一个“角色类”

0-9是范围,A-F也是a-f。请注意,它们使它与大小写匹配。

当看到这个\ s * [.A-Za-z0-9 \注意到之间有什么\ 正则表达式通常包含您搜索条件和范围的区域。

if((dataRecieved != null) && (dataRecieved.matches("\\s*[0-9A-Fa-f]{2} [0-9A-Fa-f]{2}\\s*\r?\n?" ))) {

此行询问有条件的'if'并且有&&因此,对于整个条件,两者都必须为true,否则返回false。

还有更多但在我继续之前:

我建议此时编辑您的问题并澄清您的理解,然后询问有关代码特定部分的问题。我没有在你的问题中听到你对这个代码的哪些部分感到困惑,所以在没有解释整个问题的情况下很难回答你的问题。

我希望这个答案可以帮助你开始