- 在 build.gradle 中添加依赖：
implementation("com.herohan:UVCAndroid:1.0.9")- 使用
@Composable
fun AndroidUsbCamera(usbDevice: UsbDevice?, modifier: Modifier = Modifier) {
if (usbDevice == null) return
val context = LocalContext.current
val surfaceView = remember { SurfaceView(context) }
DisposableEffect(usbDevice) {
val mCameraHelper = CameraHelper()
mCameraHelper.setStateCallback(object : ICameraHelper.StateCallback {
override fun onAttach(device: UsbDevice?) {}
override fun onDeviceOpen(device: UsbDevice?, isFirstOpen: Boolean) {}
override fun onCameraOpen(device: UsbDevice?) {}
override fun onCameraClose(device: UsbDevice?) {}
override fun onDeviceClose(device: UsbDevice?) {}
override fun onDetach(device: UsbDevice?) {}
override fun onCancel(device: UsbDevice?) {}
})
mCameraHelper.selectDevice(usbDevice)
mCameraHelper.openCamera()
mCameraHelper.addSurface(surfaceView.holder.surface, false)
mCameraHelper.startPreview()
onDispose {
mCameraHelper.removeSurface(surfaceView.holder.surface)
mCameraHelper.release()
}
}
AndroidView({ surfaceView }, modifier)
}@Composable
fun AndroidUsbCameraDemo(modifier: Modifier = Modifier) {
val context = LocalContext.current
val mCameraHelper = CameraHelper()
var usbDevice by remember { mutableStateOf<UsbDevice?>(null) }
DisposableEffect(Unit) {
//
fun setUsbDevice() {
val deviceList = mCameraHelper.deviceList.filter { it.productName == "USB Video" }
usbDevice = deviceList.getOrNull(0)
}
setUsbDevice()
//息屏后 亮屏前对应的USB设备的deviceName会发生改变 所以监听亮屏广播 重新获取设备列表
val receiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
if (intent.action == Intent.ACTION_SCREEN_ON) {
MainScope().launch {
delay(2000)//亮屏后 重新获取usb设备需要时间
setUsbDevice()
}
}
}
}
context.registerReceiver(receiver, IntentFilter(Intent.ACTION_SCREEN_ON))
onDispose {
context.unregisterReceiver(receiver)
mCameraHelper.release()
}
}
AndroidUsbCamera(usbDevice, modifier)
}