using Android.App;
using Android.Content.PM;
using Android.OS;
using AndroidX.Core.App;
using Android;
using AndroidX.Core.Content;
using Java.Util.Concurrent;
using AndroidX.Camera.Lifecycle;
using AndroidX.Camera.Core;
namespace BadClaims
{
    [Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
    public class MainActivity : MauiAppCompatActivity
    {
        private string[] REQUIRED_PERMISSIONS = new[] { Manifest.Permission.Camera, Manifest.Permission.RecordAudio, Manifest.Permission.WriteExternalStorage };
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            if (allPermissionsGranted()) return;
            ActivityCompat.RequestPermissions(this, new[] { Manifest.Permission.Camera, Manifest.Permission.RecordAudio, Manifest.Permission.WriteExternalStorage }, 10);
        }
        private IExecutorService cameraExecutor { get; set; } = null!;
        private bool allPermissionsGranted() => REQUIRED_PERMISSIONS.Select(x => ContextCompat.CheckSelfPermission(BaseContext, x)).ToList().All(x => x == Permission.Granted);
        protected override void OnDestroy()
        {
            base.OnDestroy();
            cameraExecutor?.Shutdown();
        }
        private async void startCam() {
          var cameraProviderFuture = ProcessCameraProvider.GetInstance(BaseContext);
           // var x= cameraProviderFuture.Get();
     
         //   var preview = new Preview.Builder().Build().;
         
           // cameraProviderFuture.AddListener( ,ContextCompat.GetMainExecutor(BaseContext));
        }
    }
}

正如你所看到的，我试着理解xamarin，我喜欢关注的是"var cameraProviderFuture"
我喜欢的是，我喜欢流到mp4文件。。我可以选择任何camrea在一个android。
基本型
1.)获取Android中的所有camrea设备。
2.)启动和停止..
3.)使它的格式，也许mp4容易理解的格式，以流。4。）whit出任何surix或布局
我尝试从java转换..
我迷路了。
我找不到任何关于如何找到多少相机的信息。
我喜欢用相机。