title: android 4.3 Bluetooth ble don't called onCharacteristicRead()
body: <p>I've set the notification into android, It is not calling to method <code>onCharacteristicRead()</code>????
  It does not enter into the function. Why it is happening so??</p>
  
  <p>Any help is appreciated</p>
  
  <p>Request the solutions.</p>
  
  <p><strong>This is my code:</strong></p>
  
  <pre><code>private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
      @Override
      public void onConnectionStateChange(BluetoothGatt gatt, int status,
              int newState) {
          if (newState == BluetoothProfile.STATE_CONNECTED) {
              Log.i(TAG, "Connected to GATT server.");
              // Attempts to discover services after successful connection.
              Log.i(TAG, "Attempting to start service discovery:"
                      + mBluetoothGatt.discoverServices());
          } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
              Log.i(TAG, "Disconnected from GATT server.");
          }
      }
  
      @Override
      public void onServicesDiscovered(BluetoothGatt gatt, int status) {
          if (status == BluetoothGatt.GATT_SUCCESS) {
              gattServices = mBluetoothGatt
                      .getService(SampleGattAttributes.SERVICES_UUID);
              if (gattServices != null) {
                  gattCharacteristics = gattServices
                          .getCharacteristic(SampleGattAttributes.CHARACTERISTIC_UUID);
                  System.out.println("character--&gt;" + gattCharacteristics);
              }
              if (gattCharacteristics != null) {
                  System.out.println("Characteristic not null");
                  System.out.println("Characteristic Properties--&gt;"
                          + gattCharacteristics.getProperties());
                  mBluetoothGatt.setCharacteristicNotification(gattCharacteristics,
                  true);
              }
          } else {
              Log.w(TAG, "onServicesDiscovered received: " + status);
          }
      }
  
      @Override
      public void onCharacteristicRead(BluetoothGatt gatt,
              BluetoothGattCharacteristic characteristic, int status) {
          System.out.println("in read");
          if (status == BluetoothGatt.GATT_SUCCESS) {
              byte[] data = characteristic.getValue();
              System.out.println("reading");
              System.out.println(new String(data));
          }
      }
  
      @Override
      public void onCharacteristicChanged(BluetoothGatt gatt,
              BluetoothGattCharacteristic characteristic) {
          //
          System.out.println("change");
          byte[] data = characteristic.getValue();
          System.out.println(new String(data));
      }
  };
  </code></pre>
  
  <p>Thank you in advance!!</p>