6 Replies Latest reply on May 29, 2016 10:47 AM by rola_264706

    Problems with custom characteristics (PSoc - Android)

      Hello, I have a similar problem. I have a service with two characteristics ( temperature and humidity) and I created an android application to receive data from the characteristics, but I can not get one of them .


      This is the characteristic that if it works (temperature):


      cbtemp.setOnClickListener(new View.OnClickListener() { //CheckBox temperature




      public void onClick(View view) {


      boolean isChecked = ((CheckBox) view).isChecked();


      if (isChecked) {


        BluetoothGattService mCustomService=mBluetoothLeService.getServices();


        BluetoothGattCharacteristic mCustomCharacteristic = mCustomService.getCharacteristic(UUID.fromString("00000002-0000-1000-   8000- 00805f9b34fb"));   //UUID characteristic temperature


        final int charaProp = mCustomCharacteristic.getProperties();


        if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0) {


          if (mNotifyCharacteristic != null) {


            mBluetoothLeService.setCharacteristicNotification(mNotifyCharacteristic, false);


            mNotifyCharacteristic = null;




      mBluetoothLeService.readCharacteristic(mCustomCharacteristic); }


      if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {


          mNotifyCharacteristic = mCustomCharacteristic;


          mBluetoothLeService.setCharacteristicNotification(mCustomCharacteristic, true); }






      where getservices() function is :


      public BluetoothGattService getServices(){


      return mBluetoothGatt.getService(UUID.fromString("00000001-0000-1000-8000-00805f9b34fb"));  //UUID Service




      For the characteristic humidity I do the same procedure but using the corresponding UUID (00000003-0000-1000-   8000-00805f9b34fb) but by clicking on the checkbox to activate it tells me :


      java.lang.NullPointerException : Attempt to invoke virtual method ' int android.bluetooth.BluetoothGattCharacteristic.getProperties () ' on a null object reference


      I'm really lost and not to do more . Thank you