android– 如何通过蓝牙获取InputStream并放入Textview？

概述这是我在SO中的第一个问题.我是新的(并且很兴奋)在Android编程中,这是我的问题：我正在使用我的Android手机和微控制器构建项目.微控制器有一个距离传感器并传输其值.我已经设法连接到微控制器并发送正确的信号,但我无法获得距离测量或其他任何东西.应用程序不会崩溃或任何它不会从微

这是我在SO中的第一个问题.我是新的(并且很兴奋)在Android编程中,这是我的问题：我正在使用我的AndroID手机和微控制器构建项目.微控制器有一个距离传感器并传输其值.我已经设法连接到微控制器并发送正确的信号,但我无法获得距离测量或其他任何东西.应用程序不会崩溃或任何它不会从微控制器获取数据(我的计算机从微控制器获取数据(数据是字符串)).我的AndroID应用程序的代码是这样的：

公共类Accelerometer扩展Activity {

// Intent request codesprivate static final int REQUEST_CONNECT_DEVICE = 1;private static final int REQUEST_ENABLE_BT = 2;private static final int RECIEVE_MESSAGE = 3;// Program variablesprivate byte microcOut;private boolean ledStat;private boolean connectStat = false;private button btnled;private button connect_button;private TextVIEw yAccel, xAccel, incoming;protected static final int MOVE_TIME = 80;private long lastWrite = 0;OnClickListener myClickListener;ProgressDialog myProgressDialog;private Toast failToast;private Handler mHandler,h;private StringBuilder sb = new StringBuilder();// Sensor object used to handle accelerometerprivate SensorManager mySensorManager; private List<Sensor> sensors; private Sensor accSensor;// Bluetooth Stuffprivate BluetoothAdapter btAdapter = null;private BluetoothSocket btSocket = null; private OutputStream outStream = null;private inputStream inStream = null;private ConnectThread mConnectThread = null;private ConnectedThread mConnectedThread;private String deviceAddress = null;// Well kNown SPP UUID (will *probably* map to RFCOMM channel 1 (default) if not in use); private static final UUID SPP_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");//Sound Clip to make app prettIErMediaPlayer myclip;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    getwindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);    setContentVIEw(R.layout.activity_accelerometer);    myclip = MediaPlayer.create(this, R.raw.cartcar);    myclip.start();     // Finds buttons in .xml layout file    btnled = (button) findVIEwByID(R.ID.led_button1);    connect_button = (button) findVIEwByID(R.ID.connect_button1);    yAccel = (TextVIEw) findVIEwByID(R.ID.accText1);    xAccel = (TextVIEw) findVIEwByID(R.ID.accText2);    incoming = (TextVIEw) findVIEwByID(R.ID.incoming);    // Set Sensor    mySensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);     sensors = mySensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER);    if(sensors.size() > 0) accSensor = sensors.get(0);    myProgressDialog = new ProgressDialog(this);    failToast = Toast.makeText(this, R.string.FailedToConnect, Toast.LENGTH_SHORT);    mHandler = new Handler() {        @OverrIDe        public voID handleMessage(Message msg) {         if (myProgressDialog.isShowing()) {                myProgressDialog.dismiss();            }         // Check if bluetooth connection was made to selected device            if (msg.what == 1) {                // Set button to display current status                connectStat = true;                connect_button.setText(R.string.connected);                // reset the BluCar                microcOut = 0;                ledStat = false;                write(microcOut);            }else {                // Connection Failed             failToast.show();            }        }    };    h = new Handler() {        public voID handleMessage(androID.os.Message msg) {            switch (msg.what) {            case RECIEVE_MESSAGE:                                                   // if receive massage                byte[] readBuf = (byte[]) msg.obj;                String strIncom = new String(readBuf, 0, msg.arg1);                 // create string from bytes array                sb.append(strIncom);                                                // append string                int endOflineIndex = sb.indexOf("\r\n");                            // determine the end-of-line                if (endOflineIndex > 0) {                                            // if end-of-line,                    String sbprint = sb.substring(0, endOflineIndex);               // extract string                    sb.delete(0, sb.length());                                      // and clear                    incoming.setText("Data from Arduino: " + sbprint);            // update TextVIEw                 }                //Log.d(TAG, "...String:"+ sb.toString() +  "Byte:" + msg.arg1 + "...");                break;            }        };    }; // Check whether bluetooth adapter exists    btAdapter = BluetoothAdapter.getDefaultAdapter();     if (btAdapter == null) {          Toast.makeText(this, R.string.no_bt_device, Toast.LENGTH_LONG).show();          finish();          return;     }     // If BT is not on, request that it be enabled.    if (!btAdapter.isEnabled()) {        Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);        startActivityForResult(enableIntent, REQUEST_ENABLE_BT);    }    /**********************************************************************     * buttons for controlling BluCar     */    connect_button.setonClickListener(new VIEw.OnClickListener() {        // Connect to Bluetooth Module        @OverrIDe        public voID onClick(VIEw v) {            if (connectStat) {                // Attempt to disconnect from the device                disconnect();            }else{                // Attempt to connect to the device                connect();            }        }    });    // Toggle headlights    btnled.setonClickListener(new VIEw.OnClickListener() {        @OverrIDe        public voID onClick(VIEw v) {            if (ledStat) {                microcOut = (byte) (microcOut & 124);                btnled.setText(R.string.ledbuttonON);                ledStat = false;            }else{                microcOut = (byte) (microcOut | 128);                btnled.setText(R.string.ledbuttonOFF);                ledStat = true;            }            write(microcOut);        }    });}/** Thread used to connect to a specifIEd Bluetooth Device */public class ConnectThread extends Thread {private String address;private boolean connectionStatus;    ConnectThread(String MACaddress) {        address = MACaddress;        connectionStatus = true;}    public voID run() {    // When this returns, it will 'kNow' about the server,        // via it's MAC address.         try {            BluetoothDevice device = btAdapter.getRemoteDevice(address);            // We need two things before we can successfully connect             // (authentication issues asIDe): a MAC address, which we             // already have, and an RFCOMM channel.             // Because RFCOMM channels (aka ports) are limited in             // number, AndroID doesn't allow you to use them directly;             // instead you request a RFCOMM mapPing based on a service             // ID. In our case, we will use the well-kNown SPP Service             // ID. This ID is in UUID (GUID to you MicrosoftIEs)             // format. Given the UUID, AndroID will handle the             // mapPing for you. Generally, this will return RFCOMM 1,             // but not always; it depends what other Bluetooth services             // are in use on your AndroID device.             try {                  btSocket = device.createRfcommSocketToServiceRecord(SPP_UUID);             } catch (IOException e) {                 connectionStatus = false;            }         }catch (IllegalArgumentException e) {            connectionStatus = false;        }       // discovery may be going on, e.g., if you're running a        // 'scan for devices' search from your handset's Bluetooth        // settings, so we call canceldiscovery(). It doesn't hurt        // to call it, but it might hurt not to... discovery is a        // heavyweight process; you don't want it in progress when        // a connection attempt is made.        btAdapter.canceldiscovery();        // Blocking connect, for a simple clIEnt nothing else can        // happen until a successful connection is made, so we        // don't care if it blocks.        try {            btSocket.connect();        } catch (IOException e1) {            try {                 btSocket.close();             } catch (IOException e2) {            }       }       // Create a data stream so we can talk to server.        try {         outStream = btSocket.getoutputStream();        } catch (IOException e2) {        connectionStatus = false;       }       // Send final result       if (connectionStatus) {        mHandler.sendEmptyMessage(1);       }else {        mHandler.sendEmptyMessage(0);       }    }}public voID onActivityResult(int requestCode, int resultCode, Intent data) {     switch (requestCode) {       case REQUEST_CONNECT_DEVICE:         // When DeviceListActivity returns with a device to connect           if (resultCode == Activity.RESulT_OK) {            // Show please wait dialog            myProgressDialog = ProgressDialog.show(this, getResources().getString(R.string.pleaseWait), getResources().getString(R.string.makingConnectionString), true);            // Get the device MAC address            deviceAddress = data.getExtras().getString(DeviceList.EXTRA_DEVICE_ADDRESS);            // Connect to device with specifIEd MAC address              mConnectThread = new ConnectThread(deviceAddress);              mConnectThread.start();           }else {             // Failure retrIEving MAC address             Toast.makeText(this, R.string.macFailed, Toast.LENGTH_SHORT).show();           }           break;       case REQUEST_ENABLE_BT:           // When the request to enable Bluetooth returns           if (resultCode == Activity.RESulT_OK) {               // Bluetooth is Now enabled           } else {               // User dID not enable Bluetooth or an error occured               Toast.makeText(this, R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show();               finish();           }        }   }public voID write(byte data) {     if (outStream != null) {          try {             outStream.write(data);          } catch (IOException e) {          }      }  }  public voID emptyOutStream() {     if (outStream != null) {          try {             outStream.flush();          } catch (IOException e) {          }      }  }  public voID connect() {     // Launch the DeviceListActivity to see devices and do scan      Intent serverIntent = new Intent(this, DeviceList.class);      startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE);  }  public voID disconnect() {     if (outStream != null) {         try {                outStream.close();                connectStat = false;                connect_button.setText(R.string.disconnected);            } catch (IOException e) {            }     }   }  private final SensorEventListener mSensorListener = new SensorEventListener() {        @OverrIDe        public voID onAccuracyChanged(Sensor sensor, int accuracy) {}        @OverrIDe        public voID onSensorChanged(SensorEvent event) {            // Checks whether to send steering command or not            long date = System.currentTimeMillis();            if (date - lastWrite > MOVE_TIME) {                yAccel.setText(" " + event.values[1]);                xAccel.setText(" " + event.values[0]);                if (event.values[1] > 2.5) {                    // Turn right                    microcOut = (byte) (microcOut & 248);                    microcOut = (byte) (microcOut | 4);                }else if (event.values[1] < -2.5) {                    // Turn left                    microcOut = (byte) (microcOut & 244);                    microcOut = (byte) (microcOut | 8);                }else {                    // Center the steering servo                    microcOut = (byte) (microcOut & 240);                }                write(microcOut);                lastWrite = date;            }        }      };@OverrIDepublic boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.activity_accelerometer, menu);    return true;}public voID onResume() {      super.onResume();     mySensorManager.registerListener(mSensorListener, accSensor, SensorManager.SENSOR_DELAY_GAME);}@OverrIDe public voID onDestroy() {      emptyOutStream();     disconnect();     if (mSensorListener != null) {         mySensorManager.unregisterListener(mSensorListener);     }     super.onDestroy();      myclip.release();} private class ConnectedThread extends Thread {    private final inputStream mmInStream;    private final OutputStream mmOutStream;    public ConnectedThread(BluetoothSocket socket) {        inputStream tmpIn = null;        OutputStream tmpOut = null;        // Get the input and output streams, using temp objects because        // member streams are final        try {            tmpIn = socket.getinputStream();            tmpOut = socket.getoutputStream();        } catch (IOException e) { }        mmInStream = tmpIn;        mmOutStream = tmpOut;    }    public voID run() {        byte[] buffer = new byte[256];  // buffer store for the stream        int bytes; // bytes returned from read()        // Keep Listening to the inputStream until an exception occurs        while (true) {            try {                // Read from the inputStream                bytes = mmInStream.read(buffer);        // Get number of bytes and message in "buffer"                h.obtainMessage(RECIEVE_MESSAGE, bytes, -1, buffer).sendToTarget();     // Send to message queue Handler            } catch (IOException e) {                break;            }        }    }    /* Call this from the main activity to send data to the remote device */    public voID write(String message) {        byte[] msgBuffer = message.getBytes();        try {            mmOutStream.write(msgBuffer);        } catch (IOException e) {          }    }}

}

我已经阅读了关于这个主题的所有内容(蓝牙,互联网上的人们的项目…),我很累.任何帮助深表感谢.

– 编辑 –

我已设法将输入流输入到我的textevIEw中.我现在的问题是,当我尝试连接到我的设备(微控制器或我的电脑)时,我的应用程序卡在progressdialog中(它连接到设备,但progressdialog不会消失)并等待进入的东西.过了一会儿(比如5-6秒),即使有什么东西进来,它仍然卡住了,我不得不强迫它关闭.我认为问题在于处理程序处理线程的方式.在调试器中,没有问题所有线程运行正常.

我的代码中的更改是：
在我的ConnectThread中：
 `/ **用于连接指定蓝牙设备的线程* /
    公共类ConnectThread扩展Thread {
    私有字符串地址;
    private boolean connectionStatus;

    ConnectThread(String MACaddress) {        address = MACaddress;        connectionStatus = true;}    public voID run() {    // When this returns, it will 'kNow' about the server,        // via it's MAC address.         try {            BluetoothDevice device = btAdapter.getRemoteDevice(address);            // We need two things before we can successfully connect             // (authentication issues asIDe): a MAC address, which we             // already have, and an RFCOMM channel.             // Because RFCOMM channels (aka ports) are limited in             // number, AndroID doesn't allow you to use them directly;             // instead you request a RFCOMM mapPing based on a service             // ID. In our case, we will use the well-kNown SPP Service             // ID. This ID is in UUID (GUID to you MicrosoftIEs)             // format. Given the UUID, AndroID will handle the             // mapPing for you. Generally, this will return RFCOMM 1,             // but not always; it depends what other Bluetooth services             // are in use on your AndroID device.             try {                  btSocket = device.createRfcommSocketToServiceRecord(SPP_UUID);             } catch (IOException e) {                 connectionStatus = false;            }         }catch (IllegalArgumentException e) {            connectionStatus = false;        }       // discovery may be going on, e.g., if you're running a        // 'scan for devices' search from your handset's Bluetooth        // settings, so we call canceldiscovery(). It doesn't hurt        // to call it, but it might hurt not to... discovery is a        // heavyweight process; you don't want it in progress when        // a connection attempt is made.        btAdapter.canceldiscovery();        // Blocking connect, for a simple clIEnt nothing else can        // happen until a successful connection is made, so we        // don't care if it blocks.        try {            btSocket.connect();        } catch (IOException e1) {            try {                 btSocket.close();             } catch (IOException e2) {            }       }       // Create a data stream so we can talk to server.        try {             outStream = btSocket.getoutputStream();           } catch (IOException e2) {            connectionStatus = false;          }       try{        inStream = btSocket.getinputStream();    }catch (IOException e2){        connectionStatus = false;    }        int bytes; // bytes returned from read()       // Keep Listening to the inputStream until an exception occurs       while (connectionStatus) {           try {               byte[] b = new byte[64];  // buffer store for the stream               // Read from the inputStream               bytes = inStream.read(b);        // Get number of bytes and message in "buffer"               mHandler.obtainMessage(RECIEVE_MESSAGE, bytes, -1, b).sendToTarget();     // Send to message queue Handler           } catch (IOException e) {               break;           }       }       // Send final result       if (connectionStatus) {        mHandler.obtainMessage(1);       }else {        mHandler.sendEmptyMessage(0);       }    }}

`
在我的onCreate方法的mHandler中：

 mHandler = new Handler() {        @OverrIDe        public voID handleMessage(Message msg) {         if (myProgressDialog.isShowing()) {                myProgressDialog.dismiss();            }         // Check if bluetooth connection was made to selected device            if (msg.what == 1) {                // Set button to display current status                connectStat = true;                connect_button.setText(R.string.connected);                // reset the BluCar                microcOut = 0;                ledStat = false;                write(microcOut);            }else if (msg.what == 2){                byte[] readBuf = (byte[]) msg.obj;                String strIncom = new String(readBuf, 0, msg.arg1);                 // create string from bytes array                sb.append(strIncom);                                                // append string                int endOflineIndex = sb.indexOf(".");                            // determine the end-of-line                if (endOflineIndex > 0) {                                            // if end-of-line,                    String sbprint = sb.substring(0, endOflineIndex);               // extract string                    sb.delete(0, sb.length());                                      // and clear                    incoming.setText(sbprint);            // update TextVIEw                    connectStat = true;                    connect_button.setText(R.string.connected);                }else{                    incoming.setText("Problem!");                }            }else {                // Connection Failed             failToast.show();            }        }    };

我需要的另一件事是如何在缓冲区满时清空缓冲区.

PS：感谢每个人的帮助,我真的很感激.

解决方法:

作为使用处理程序的替代方法,只需获取线程运行中的信息.

我这样做了,它对我有用.

public voID run() {            byte[] buffer = new byte[128];  // buffer store for the stream            int bytes; // bytes returned from read()            // Keep Listening to the inputStream until an exception occurs            while (true) {                try {                    bytes = mmInStream.read(buffer);                    byte[] readBuf = (byte[]) buffer;                    String strIncom = new String(readBuf, 0, bytes);                 // create string from bytes array                    sb.append(strIncom);                                                // append string                    int endOflineIndex = sb.indexOf("\r\n");                            // determine the end-of-line                    if (endOflineIndex > 0) {                          // add the current string to eol to a local string                        String sbprint = sb.substring(0, endOflineIndex);                        // get the start and end indexes of the heading                        int startheading = sb.indexOf("HE");                        int endheading = sb.indexOf("/HE");                        // set the heading                        Henry.this.setCurrentheading(sb.substring((startheading + 2), endheading));                        // get the start and end indexes of the front range                        int startFrontRange = sb.indexOf("FR");                        int endFrontRange = sb.indexOf("/FR");                        // get the front range                        Henry.this.currentFrontRange = sb.substring((startFrontRange + 2), endFrontRange);             ... ( grab all the information you need here ) ...                        // deBUGging output what we have                        // System.out.println("recv: " + sbprint);                        // clean out the sb to ready next run                        sb.delete(0, sb.length());                       }

我保存从我的应用程序(亨利)中的串行连接中检索到的所有信息,然后任何想要使用该信息的活动从应用程序获取它.如果视图需要对信息有更新的透视图,我会在视图中添加一个计时器,以便根据需要随时添加刷新方法.这具有额外的优势,能够使用AndroID应用程序中任何位置的信息.

我从arduino向设备发送大约10个数据点,从设备向arduino发送大约3个数据点.我在数据点周围添加了自己的标记来识别它们.

希望这可以帮助！

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