Attempt to invoke virtual method 'java.io.OutputStream me.aflak.bluetooth.Bluetooth$ReceiveThread.getOutputStream()' on a null object reference

[kvnramirez]

Hi, I'm trying to send a message inmediately after the device is connected, but keeps throwing this error:

java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.OutputStream me.aflak.bluetooth.Bluetooth$ReceiveThread.getOutputStream()' on a null object reference

I'm sending it on DeviceCallback using onDeviceConnected function

override fun onDeviceConnected(device: BluetoothDevice) {
statusMessage?.text = getString(R.string.connected)
bluetooth?.send("3")
}

I need to sent the value inmediately after connection to start to read sensors from an arduino

[omaraflak]

Hi, please post the code of your Activity.

What kind of bluetooth module do you have ? Is it BLE or not ? This library does not support BLE devices.

Also take a look at that example : https://github.com/OmarAflak/Bluetooth-Library/blob/master/app/src/main/java/me/aflak/libraries/ChatActivity.java

[omaraflak]

This issue was solved in the new version :

implementation 'me.aflak.libraries:bluetooth:1.3.7'