Android BLE onCharacteristic读取错误的状态导致蓝牙已停止工作

问题描述：

我正在开发一个Android应用程序，每天必须连接+/- 120个BLE GATT服务器，其中至少有3个服务器同时具有完全相同的服务和特点。尽管遵循所有标准和默认模式，但我一直在体验Android BLE的各种问题。Android BLE onCharacteristic读取错误的状态导致蓝牙已停止工作

每天发生的事情是，我必须至少一次将平板电脑重置为默认设置，因为'蓝牙已停止工作'，其中找不到原因。这是非常令人沮丧的，我无法忍受这种类型的维护每一天（硬重置）。

起初，我尝试了Android SDK 18的BLE，其中的行为非常奇怪，只用了一天就显示出糟糕的结果。所以我开始使用操纵Android BLE的棒棒糖版本，它显示了一些改进。

我几天来都在遇到这些问题，因为我得到了意想不到的结果，例如onCharacteristicRead返回但数据为空。例如，我在带有STATE_CONNECTED的onConnectionStateChanged之后调用discoverServices（），因此在一段时间之后onServicesDiscovered（）被调用但getServices（）返回null。所有这些问题只发生在从第一台服务器断开连接之后。它连接的第一台服务器正确读写所有内容，然后断开连接（）和onConnectionStateChanged（），然后关闭（）。因此，我连接到下一个服务器，并且我开始遇到这些问题（所有GATT操作都在主线程中，所有连接都正确并妥善处理），因此我必须断开连接，以便can应用程序可以读取GATT属性正确。

我有3个阅读特征，阅读第三个特征后，我开始写3个特征。

我已经通过蓝牙日志，我可以看到意外的事情发生。该日志，当应用程序读取一切正常（它总是只有第一GATT服务器的应用程序连接到）：

10-11 09:08:05.350 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.350 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.350 15989-15989/efp.android.sample D/BluetoothLeScanner: Start Scan 
10-11 09:08:05.351 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.352 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.353 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.354 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.362 15989-15994/efp.android.sample I/art: Do partial code cache collection, code=48KB, data=60KB 
10-11 09:08:05.362 15989-15994/efp.android.sample I/art: After code cache collection, code=48KB, data=60KB 
10-11 09:08:05.362 15989-15994/efp.android.sample I/art: Increasing code cache capacity to 256KB 
10-11 09:08:05.457 15989-16002/efp.android.sample D/BluetoothLeScanner: onClientRegistered() - status=0 clientIf=5 mClientIf=0 
10-11 09:08:05.513 15989-15989/efp.android.sample W/IInputConnectionWrapper: getCursorCapsMode on inactive InputConnection 
10-11 09:08:05.681 15989-16023/efp.android.sample D/ScanRecord: parseFromBytes 
10-11 09:08:05.681 15989-15989/efp.android.sample D/LAURASTAR_BLE: onScanResult 
10-11 09:08:05.682 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.683 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.684 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.685 15989-15989/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-11 09:08:05.685 15989-15989/efp.android.sample D/BluetoothLeScanner: Stop Scan 
10-11 09:08:05.692 15989-15989/efp.android.sample D/BluetoothGatt: connect() - device: F5:8E:C1:91:DC:CC, auto: false 
10-11 09:08:05.692 15989-15989/efp.android.sample D/BluetoothAdapter: isSecureModeEnabled 
10-11 09:08:05.699 15989-15989/efp.android.sample D/BluetoothGatt: registerApp() 
10-11 09:08:05.699 15989-15989/efp.android.sample D/BluetoothGatt: registerApp() - UUID=ebf41986-8aad-4796-a537-7319c00f0f46 
10-11 09:08:05.802 15989-16002/efp.android.sample D/BluetoothGatt: onClientRegistered() - status=0 clientIf=5 
10-11 09:08:06.332 15989-16001/efp.android.sample D/LAURASTAR_BLE: onConnectionStateChange: 
10-11 09:08:06.332 15989-16001/efp.android.sample D/BluetoothGatt: discoverServices() - device: F5:8E:C1:91:DC:CC 
10-11 09:08:06.343 15989-16002/efp.android.sample D/BluetoothGatt: onSearchComplete() = Device=F5:8E:C1:91:DC:CC Status=0 
10-11 09:08:06.343 15989-16002/efp.android.sample D/LAURASTAR_BLE: onServicesDiscovered: 
10-11 09:08:07.143 15989-16002/efp.android.sample W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=51 Status=0 
10-11 09:08:07.233 15989-16002/efp.android.sample W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=14 Status=0 
10-11 09:08:07.324 15989-16023/efp.android.sample W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=23 Status=0 
10-11 09:08:08.136 15989-16023/efp.android.sample D/BluetoothGatt: cancelOpen() - device: F5:8E:C1:91:DC:CC 
10-11 09:08:08.146 15989-16001/efp.android.sample D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=5 device=F5:8E:C1:91:DC:CC 
10-11 09:08:08.151 15989-16001/efp.android.sample D/LAURASTAR_BLE: onConnectionStateChange: 
10-11 09:08:08.265 15989-15989/efp.android.sample D/BluetoothGatt: close() 
10-11 09:08:08.266 15989-15989/efp.android.sample D/BluetoothGatt: unregisterApp() - mClientIf=5

从第一GATT服务器断开连接到第二GATT服务器后，我必须不断断开并重新连接以读取特性，尽管它总是正确读取第一个特性。

这里的时候阅读与问题发生的日志......所以，如果读数有错误，我需要断开并重新连接（即使读重新连接后有错误，它会关闭，扫描并再次尝试）。

10-12 08:03:48.133 30409-30409/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-12 08:03:48.133 30409-30409/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-12 08:03:48.134 30409-30409/efp.android.sample D/BluetoothLeScanner: Start Scan 
10-12 08:03:48.134 30409-30409/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-12 08:03:48.137 30409-30409/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-12 08:03:48.260 30409-31121/efp.android.sample D/BluetoothLeScanner: onClientRegistered() - status=0 clientIf=6 mClientIf=0 
10-12 08:03:48.391 30409-30422/efp.android.sample D/ScanRecord: parseFromBytes 
10-12 08:03:48.395 30409-30409/efp.android.sample D/LAURASTAR_BLE: onScanResult 
10-12 08:03:48.397 30409-30409/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-12 08:03:48.397 30409-30409/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-12 08:03:48.398 30409-30409/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-12 08:03:48.399 30409-30409/efp.android.sample D/BluetoothAdapter: STATE_ON 
10-12 08:03:48.399 30409-30409/efp.android.sample D/BluetoothLeScanner: Stop Scan 
10-12 08:03:48.410 30409-30409/efp.android.sample D/BluetoothGatt: connect() - device: F5:8E:C1:91:DC:CC, auto: false 
10-12 08:03:48.410 30409-30409/efp.android.sample D/BluetoothAdapter: isSecureModeEnabled 
10-12 08:03:48.411 30409-30409/efp.android.sample D/BluetoothGatt: registerApp() 
10-12 08:03:48.411 30409-30409/efp.android.sample D/BluetoothGatt: registerApp() - UUID=ce6919e5-e4f7-4180-a313-557e168a7c5a 
10-12 08:03:48.514 30409-30422/efp.android.sample D/BluetoothGatt: onClientRegistered() - status=0 clientIf=6 
10-12 08:03:48.745 30409-31121/efp.android.sample D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=6 device=F5:8E:C1:91:DC:CC 
10-12 08:03:48.755 30409-31121/efp.android.sample D/BluetoothGatt: discoverServices() - device: F5:8E:C1:91:DC:CC 
10-12 08:03:48.915 30409-30414/efp.android.sample I/art: Do partial code cache collection, code=19KB, data=28KB 
10-12 08:03:48.916 30409-30414/efp.android.sample I/art: After code cache collection, code=19KB, data=28KB 
10-12 08:03:48.916 30409-30414/efp.android.sample I/art: Increasing code cache capacity to 128KB 
10-12 08:03:48.982 30409-30422/efp.android.sample D/BluetoothGatt: onClientConnParamsChanged() - Device=F5:8E:C1:91:DC:CC interval=6 status=0 (I DONT THINK THIS SHOULD HAPPEN) 
10-12 08:03:49.688 30409-30421/efp.android.sample D/BluetoothGatt: onSearchComplete() = Device=F5:8E:C1:91:DC:CC Status=0 
10-12 08:03:49.689 30409-30421/efp.android.sample D/LAURASTAR_BLE: onServicesDiscovered: 
10-12 08:03:49.711 30409-30422/efp.android.sample D/BluetoothGatt: onClientConnParamsChanged() - Device=F5:8E:C1:91:DC:CC interval=36 status=0 
10-12 08:03:50.467 30409-31121/efp.android.sample W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=51 Status=0 
10-12 08:03:50.557 30409-30422/efp.android.sample W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=14 Status=5 (status NOT SUCCESS ...) 
10-12 08:03:50.830 30409-30422/efp.android.sample D/BluetoothGatt: onClientConnParamsChanged() - Device=F5:8E:C1:91:DC:CC interval=6 status=0 
10-12 08:03:51.533 30409-31121/efp.android.sample W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=14 Status=137 (status NOT SUCCESS ...) 
10-12 08:03:51.533 30409-31121/efp.android.sample D/LAURASTAR_BLE: Data is empty. (null) 
10-12 08:03:51.533 30409-31121/efp.android.sample D/BluetoothGatt: cancelOpen() - device: F5:8E:C1:91:DC:CC 
10-12 08:03:51.561 30409-30422/efp.android.sample D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=6 device=F5:8E:C1:91:DC:CC 
10-12 08:03:51.565 30409-30422/efp.android.sample D/LAURASTAR_BLE: onConnectionStateChange: 
10-12 08:03:51.565 30409-30422/efp.android.sample D/BluetoothAdapter: isSecureModeEnabled 
10-12 08:03:51.609 30409-31121/efp.android.sample D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=6 device=F5:8E:C1:91:DC:CC 
10-12 08:03:51.610 30409-31121/efp.android.sample D/LAURASTAR_BLE: onConnectionStateChange: 
10-12 08:03:51.610 30409-31121/efp.android.sample D/BluetoothGatt: discoverServices() - device: F5:8E:C1:91:DC:CC 
10-12 08:04:01.091 30409-31121/efp.android.sample D/BluetoothGatt: onSearchComplete() = Device=F5:8E:C1:91:DC:CC Status=0 
10-12 08:04:01.091 30409-31121/efp.android.sample D/LAURASTAR_BLE: onServicesDiscovered: 
10-12 08:04:02.048 30409-31121/efp.android.sample W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=51 Status=0 
10-12 08:04:02.438 30409-30421/efp.android.sample W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=14 Status=0 
10-12 08:04:02.829 30409-30421/efp.android.sample W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=23 Status=0 
10-12 08:04:02.898 30409-30414/efp.android.sample I/art: Do partial code cache collection, code=48KB, data=61KB 
10-12 08:04:02.899 30409-30414/efp.android.sample I/art: After code cache collection, code=48KB, data=61KB 
10-12 08:04:02.899 30409-30414/efp.android.sample I/art: Increasing code cache capacity to 256KB 
10-12 08:04:04.389 30409-30422/efp.android.sample D/BluetoothGatt: cancelOpen() - device: F5:8E:C1:91:DC:CC 
10-12 08:04:04.402 30409-30421/efp.android.sample D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=6 device=F5:8E:C1:91:DC:CC 
10-12 08:04:04.406 30409-30421/efp.android.sample D/LAURASTAR_BLE: onConnectionStateChange: 
10-12 08:04:04.502 30409-30409/efp.android.sample V/InputMethodManager: Starting input: [email protected] nm : efp.android.sample [email protected] 
10-12 08:04:04.502 30409-30409/efp.android.sample I/InputMethodManager: [IMM] startInputInner - mService.startInputOrWindowGainedFocus 
10-12 08:04:04.503 30409-30409/efp.android.sample D/InputTransport: Input channel constructed: fd=70 
10-12 08:04:04.503 30409-30409/efp.android.sample D/InputTransport: Input channel destroyed: fd=73 
10-12 08:04:04.519 30409-30409/efp.android.sample D/BluetoothGatt: close() 
10-12 08:04:04.520 30409-30409/efp.android.sample D/BluetoothGatt: unregisterApp() - mClientIf=6

在此日志，这是可见的，successfuly阅读第一特征后：

W/BluetoothGatt: onCharacteristicRead() - Device=F5:8E:C1:91:DC:CC handle=14 Status=5

然后onClientConnParamsChanged被discoverServices后称为（）被调用，onServicesDiscovered前（）被调用。

所有我的代码似乎是正确的...... 因此，逻辑如下：

开始通过接收用户所需的服务器的MAC地址，这样应用程序可以扫描并找到它。

我有一个的EditText实现的TextWatcher，所以当用户将MAC地址，应用程序查找具有插入地址BLE设备。

String macToFind = ""; 
private class ScanIronFieldsTextWatcher implements TextWatcher { 

    View view; 
    public ScanIronFieldsTextWatcher(View view) { this.view = view; } 

    @Override 
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {} 

    @Override 
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {} 


    public void afterTextChanged(Editable editable) { 

     switch (view.getId()) { 
      case R.id.txt_mac_address: { 
       String originalText = txtMacAddress.getText().toString().toUpperCase(); 
       String macToFind = Tools.getValidMacAddress(originalText); 
       if(mConnectedGatt != null && mConnectedGatt.getDevice().getAddress().equals(macToFind)) { 
        mConnectedGatt.connect(); 
       } 
       else { 
        if(mConnectedGatt != null) { 
         mConnectedGatt.close(); 
         mConnectedGatt = null; 
        } 

        //Search mac address 
        writeToActivityLog("Looking for " + macToFind +"...", LogAdapter.MESSAGE_TYPE_NORMAL); 
        hideKeyboard(); 
        startScan(); 
       } 
      } 
     } 
    } 
}

用户插入mac地址后，启动startScan（）。

startScan（）

private void startScan() { 
     if (!mBluetoothAdapter.isEnabled()) { 
      writeToActivityLog("Bluetooth is off!", LogAdapter.MESSAGE_TYPE_ERROR); 
      return; 
     } 
     try { 
      ScanFilter scanFilter = new ScanFilter.Builder().setDeviceAddress(macToFind).build(); 
      ArrayList<ScanFilter> filters = new ArrayList<ScanFilter>(); 
      filters.add(scanFilter); 

      ScanSettings settings = new ScanSettings.Builder().setScanMode(ScanSettings.SCAN_MODE_BALANCED).build(); 
      mBluetoothAdapter.getBluetoothLeScanner().startScan(filters, settings, mScanCallback); 


      retryingHandler = new Handler(); 
      retryingHandler.postDelayed(new Runnable() { 
       @Override 
       public void run() { 
        showProgress(false); 
        stopScan(); 

        if (mDevices.size() == 0) { 
         writeToActivityLog("Server not found.", LogAdapter.MESSAGE_TYPE_ERROR); 
        } else { 
         mDevices.clear(); 
        } 
       } 
      }, SCAN_TIME); 
     } catch (IllegalArgumentException e) { 
      writeToActivityLog("Invalid Address!", LogAdapter.MESSAGE_TYPE_ERROR); 
     } 
    }

mScanCallback：

private ScanCallback mScanCallback = new ScanCallback() { 
     @Override 
     public void onScanResult(int callbackType, ScanResult result) { 
      Log.d(TAG, "onScanResult"); 
      processResult(result); 
     } 

     @Override 
     public void onBatchScanResults(List<ScanResult> results) { 
      Log.d(TAG, "onBatchScanResults: "+results.size()+" results"); 
      for (ScanResult result : results) { 
       processResult(result); 
      } 
     } 

     @Override 
     public void onScanFailed(int errorCode) { Log.w(TAG, "LE Scan Failed: "+errorCode); } 

     private void processResult(final ScanResult result) { 
      runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        if(mConnectedGatt == null) { 
         stopScan(); 
         final BluetoothDevice device = result.getDevice(); 
         mDevices.put(device.hashCode(), device); 

         writeToActivityLog("Server found!", LogAdapter.MESSAGE_TYPE_NORMAL); 
         writeToActivityLog("Connecting to " + macToFind + "...", LogAdapter.MESSAGE_TYPE_NORMAL); 

         mConnectedGatt = device.connectGatt(NewDeviceControlActivity.this, false, mGattCallback); 
         retryingHandler.removeCallbacksAndMessages(null); 
        } 
       } 
      }); 
     } 
    };

mGattCallback

private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() { 
     @Override 
     public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { 
      super.onConnectionStateChange(gatt, status, newState); 

      if (newState == BluetoothProfile.STATE_CONNECTED) { 
       writeToActivityLog("Connected.", LogAdapter.MESSAGE_TYPE_SUCCESS); 
       mConnected = true; 

       if(!gatt.discoverServices()) { 
        writeToActivityLog("Impossible discoverServices().", LogAdapter.MESSAGE_TYPE_ERROR); 
        if(!retrying) 
         retrying = true; 
        mConnectedGatt.disconnect(); 
       } 
      } 
      else if(newState == BluetoothProfile.STATE_DISCONNECTED) { 

       writeToActivityLog("Disconnected.", LogAdapter.MESSAGE_TYPE_NORMAL); 
       if(!currentIron.hasCompletedSetup()) { 
        showProgress(true); 

        if(retrying) { 
         writeToActivityLog("Trying again...", LogAdapter.MESSAGE_TYPE_NORMAL); 
         if(mConnectedGatt != null) 
          mConnectedGatt.connect(); 
        } 
        else { 
         writeToActivityLog("Trying again but also scanning again... (r)", LogAdapter.MESSAGE_TYPE_NORMAL); 
         retrying = false; 
         if(mConnectedGatt != null) 
          mConnectedGatt.close(); 
         mHandler.postDelayed(new Runnable() { 
          @Override 
          public void run() { 
           startScan(); 
          } 
         }, 2000); 
        } 
       } 
      } 
     } 

     @Override 
     public void onServicesDiscovered(final BluetoothGatt gatt, int status) { 
      super.onServicesDiscovered(gatt, status); 
      Log.d(TAG, "onServicesDiscovered:"); 

      mHandler.postDelayed(new Runnable() { 
       @Override 
       public void run() { 
        startObtainingIronData(gatt); 
       } 
      }, 700); 
     } 

     @Override 
     public void onCharacteristicRead(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic, final int status) { 
      super.onCharacteristicRead(gatt, characteristic, status); 


      byte[] data = characteristic.getValue(); 
      if(status != BluetoothGatt.GATT_SUCCESS) { 
       runOnUiThread(new Runnable() { @Override public void run() {Toast.makeText(NewDeviceControlActivity.this, ("BluetoothGatt: Response != GATT_SUCCESS ("+status+")."), Toast.LENGTH_SHORT).show();}}); 
      } 

      if (characteristic.getUuid().toString().contains(Iron.IRON_CODES[4])) { 
       //First characteristic read succesfully 
       final String version = new String(data); 
       runOnUiThread(new Runnable() { @Override public void run() {Toast.makeText(NewDeviceControlActivity.this, ("Version "+version), Toast.LENGTH_SHORT).show();}}); 

       //Request to read second characteristic 
       BluetoothGattCharacteristic characteristic2 = getCharacteristic(gatt, Iron.IRON_CODES[0]); 
       gatt.readCharacteristic(characteristic2); 
      } 
      else if (characteristic.getUuid().toString().contains(Iron.IRON_CODES[0])) { 
       //Read second characteristic 
       if(data == null || data.length == 0) { //returns with status=137 
        Log.d(TAG, "Data is empty " + (data == null ? "(null)" : data));//This ALWAYS happens except the first server the app connects too 
        writeToActivityLog("Data is empty. "+ (data == null ? "(null)" : data), LogAdapter.MESSAGE_TYPE_ERROR); 
        if(!retrying) 
         retrying = true; 
        mConnectedGatt.disconnect(); 
        return; 
       } 
       else { 
        if (data[2] == 4) { 
         //Request to read third characteristic 
         BluetoothGattCharacteristic characteristic2 = getCharacteristic(gatt, Iron.IRON_CODES[1]); 
         if(characteristic2 != null) 
          gatt.readCharacteristic(characteristic2); 
         else { 
          writeToActivityLog("Impossible readCharacteristic Machine Type" , LogAdapter.MESSAGE_TYPE_ERROR); 
          if(!retrying) 
           retrying = true; 

          mConnectedGatt.disconnect(); 
         } 
        } 
       } 
      } 
      else if (characteristic.getUuid().toString().contains(Iron.IRON_CODES[1])) { 
       //Read third characteristic 
       if(data[0] == 0) { 
        BluetoothGattCharacteristic characteristic2 = getCharacteristic(gatt, Iron.IRON_CODES[2]); 
        long now = System.currentTimeMillis(); 
        byte[] nowBytes = new byte[]{(byte) ((int) (now & 255L)), (byte) ((int) (now >> 8)), (byte) ((int) (now >> 16)), (byte) ((int) (now >> 24))}; 
        characteristic2.setValue(nowBytes); 

        writeToActivityLog("Read all information succesfully.", LogAdapter.MESSAGE_TYPE_NORMAL); 

        //Request to write first characteristic 
        if (!gatt.writeCharacteristic(characteristic2)){ 
         writeToActivityLog("Impossible to write timestamp.", LogAdapter.MESSAGE_TYPE_ERROR); 
         if(!retrying) 
          retrying = true; 
         mConnectedGatt.disconnect(); 
        } 

       } 
      } 
     } 

     @Override 
     public void onCharacteristicWrite(final BluetoothGatt gatt, BluetoothGattCharacteristic characteristic2, int status) { 
      super.onCharacteristicWrite(gatt, characteristic2, status); 

      if(status == BluetoothGatt.GATT_SUCCESS) { 
       showProgress(false); 

       if(characteristic2.getUuid().toString().contains(Iron.IRON_CODES[2])) { 

        //Wrote first characteristic 
        String intToWrite = "0x01"; 
        BluetoothGattCharacteristic characteristic = getCharacteristic(gatt, Iron.IRON_CODES[1]); 
        characteristic.setValue(Integer.decode(intToWrite), BluetoothGattCharacteristic.FORMAT_UINT8, 0); 

        //Request to write second characteristic 
        if (!gatt.writeCharacteristic(characteristic)) { 
         writeToActivityLog("Impossible to write first characteristic!.", LogAdapter.MESSAGE_TYPE_ERROR); 
         if(!retrying) 
          retrying = true; 
         mConnectedGatt.disconnect(); 
        } 
       } 
       else if(characteristic2.getUuid().toString().contains(Iron.IRON_CODES[1])) { 

         //Wrote second characteristic 
         service.sendData(), new Callback<String>() { 
            @Override 
            public void onResponse(Call<String> call, Response<String> response) { 

              //Write third characteristic 
              BluetoothGattCharacteristic characteristic = getCharacteristic(gatt, Iron.IRON_CODES[3]); 
              characteristic.setValue(0x40, android.bluetooth.BluetoothGattCharacteristic.FORMAT_UINT8, 0); 
              gatt.writeCharacteristic(characteristic); 


            } 
            @Override 
            public void onFailure(Call<String> call, Throwable t) { 

             if(mConnectedGatt != null) 
              mConnectedGatt.disconnect(); 
            } 
           }); 
         } 
       } 
       else if(characteristic2.getUuid().toString().contains(Iron.IRON_CODES[3])) { 
        //Wrote third characteristic 
        writeToActivityLog("Data written successfully.", LogAdapter.MESSAGE_TYPE_SUCCESS); 

        if(mConnectedGatt != null) 
         mConnectedGatt.disconnect(); 
       } 

      } 
     } 
    };

我有三编辑运行runOnUIThread中的所有mConnectedGatt操作，但具有相同的结果。所有特征UUID都是正确的，并且正在写入的特征不是正在读取的特征。

我没有GATT服务器远离应用程序的问题，也没有太多的问题。我在三个三星Galaxy Tab A 10.1 2016上运行软件，其中都返回相同的结果。

所以我的成绩基本上都是这些：

预计（只与第一服务器发生在应用程序连接到）：

寻找MAC
服务器找到了！
连接到MAC
连接。
（读出的第一特征）版本：
（读取第二特征）
（读第三特征）
（写第一特性）
（写入第二特性）
（写入第三特性）
断开连接。

会发生什么（试图连接到另一台服务器）：

寻找MAC
服务器找到了！
连接到MAC
连接。
（已读第一个特征）版本：
数据为空！（null）
断开连接。
再试一次...
连接。
（读出的第一特征）版本：
（读取第二特征）
（读第三特征）
（写第一特性）
（写入第二特性）
（写入第三特性）
断开连接。

而我猜很多重新连接是什么导致'蓝牙已停止工作'。我不明白为什么会发生这种情况！

请，如果有人可以花一些时间来帮助我弄清楚发生了什么，我会如此感激... 谢谢

您是否在项目中添加了一些新的ble服务？如果是可能的话，你可以尝试清除蓝牙缓存。进入设置 - >应用程序点击右上角的更多图标。点击系统应用。从列表中选择蓝牙。清除存储。（有时它不会在第一时间清除缓存，点击两次到这个按钮）我希望它能够解决问题 – hasbi

@hasbi你是什么意思的新ble服务？ – Firecat

我的意思是添加新的特征 – hasbi

答

这为我工作： -

http://www.java2s.com/Open-Source/Android_Free_Code/Development/sdk/io_relayr_ble_serviceBluetoothGattReceiver_java.htm

这是使用Rx库。请尝试以下依赖关系： -

编译 “com.polidea.rxandroidble：rxandroidble：1.4.2”

实行 'io.reactivex.rxjava2：rxjava：2.1.5'

实行“IO .reactivex.rxjava2：rxandroid：2.0.1'

Android BLE onCharacteristic读取错误的状态导致蓝牙已停止工作

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