Button list USB devices, show ports

app/src/main/java/com/unicod/uarttest/MainActivity.kt

@@ -1,29 +1,47 @@
 package com.unicod.uarttest
 
+import android.annotation.SuppressLint
+import android.app.Application
+import android.content.Context
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.activity.viewModels
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.material3.Button
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.lifecycle.AndroidViewModel
+import com.hoho.android.usbserial.driver.UsbSerialDriver
+import com.hoho.android.usbserial.driver.UsbSerialProber
 import com.unicod.uarttest.ui.theme.UartTestTheme
+import android.hardware.usb.UsbManager
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.asPaddingValues
+import androidx.compose.foundation.layout.statusBars
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material3.Card
+import androidx.compose.ui.unit.dp
+
 
 class MainActivity : ComponentActivity() {
+    private val viewModel: UsbViewModel by viewModels()
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
         setContent {
             UartTestTheme {
                 Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
-                    Greeting(
+                    UsbDeviceList(viewModel)
-                        name = "Android",
-                        modifier = Modifier.padding(innerPadding)
-                    )
                 }
             }
         }
@@ -44,4 +62,53 @@ fun GreetingPreview() {
     UartTestTheme {
         Greeting("Android")
     }
-}
+}
+
+
+fun findUsbSerialDevices(context: Context): List<UsbSerialDriver> {
+    val usbManager = context.getSystemService(Context.USB_SERVICE) as UsbManager
+    return UsbSerialProber.getDefaultProber().findAllDrivers(usbManager)
+}
+
+class UsbViewModel(application: Application) : AndroidViewModel(application) {
+    private val _devices = mutableStateListOf<UsbSerialDriver>()
+    val devices: List<UsbSerialDriver> get() = _devices
+
+    fun scanUsbDevices() {
+        val found = findUsbSerialDevices(getApplication())
+        _devices.clear()
+        _devices.addAll(found)
+    }
+}
+
+@Composable
+fun UsbDeviceList(viewModel: UsbViewModel) {
+    val devices = viewModel.devices
+
+    Column (
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(WindowInsets.statusBars.asPaddingValues())
+    ) {
+        Button(onClick = { viewModel.scanUsbDevices() }) {
+            Text("Scan USB Devices")
+        }
+
+        LazyColumn {
+            items(viewModel.devices) { driver ->
+                Card() {
+                    Column(modifier = Modifier.padding(8.dp)) {
+                        Text("Device: ${driver.device.deviceName}")
+                        Text("Vendor ID: ${driver.device.vendorId}, Product ID: ${driver.device.productId}")
+                        Text("Ports: ${driver.ports.size}")
+
+                        driver.ports.forEachIndexed { index, port ->
+                            Text("↳ Port #$index", modifier = Modifier.padding(start = 16.dp))
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+