Serial port how to work?

Question

Android

Hello. Tell me please. There is an Android 4.4 device with a hardware Serial (Com) port. How can I work with this port, worked via UART

PeripheralManager manager = PeripheralManager.getInstance();
                List<String> deviceList = manager.getUartDeviceList();
                if (deviceList.isEmpty()) {
                    Log.i(TAG, "No UART port available on this device.");
                } else {
                    Log.i(TAG, "List of available devices: " + deviceList);
                }

Mistake

7736-7736/com.example.user.test_com_app E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.user.test_com_app, PID: 7736
    java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/things/pio/PeripheralManager;
        at com.example.user.test_com_app.TestComFragment$1.onClick(TestComFragment.java:45)
        at android.view.View.performClick(View.java:6597)
        at android.view.View.performClickInternal(View.java:6574)
        at android.view.View.access$3100(View.java:778)
        at android.view.View$PerformClick.run(View.java:25885)

Here is this miracle:

Here in the settings the port is determined

Maybe there are other libraries for work, or how to do it right? Thanks

Answer 1

like a real shlimazl, he didn’t even throw an error into Google :) (and there, I must say, there is an answer on the first line!)
For example: https://stackoverflow.com/a/49217334