如何在没有预览的情况下拍摄照片。 Android系统。 Xamarin _android系统

非淡泊无以明志，非宁静无以致远。这篇文章主要讲述如何在没有预览的情况下拍摄照片。 Android系统。 Xamarin相关的知识，希望能为你提供帮助。
如何在没有预览的情况下单击按钮拍摄照片？我是Xamarin的新手，所以如果我能获得尽可能多的细节，它会很棒。
答案在.axml文件中使用它：

< SurfaceView android:id="@+id/sfv" android:layout_height="1dp" android:layout_width="1dp" />

或者用它来设置c＃代码中的SurfaceView：

IWindowManager windowManager = GetSystemService(Context.WindowService).javaCast< IWindowManager> (); WindowManagerFlags flags = WindowManagerFlags.NotFocusable | WindowManagerFlags.NotTouchModal | WindowManagerFlags.NotTouchable; var layoutParams = new WindowManagerLayoutParams(1, 1, WindowManagerTypes.SystemAlert, flags, Format.Rgb888); SurfaceView sfv = new SurfaceView(this); //mll is LinearLayout mll.AddView(sfv,layoutParams);

更新：活动：

using Android.App; using Android.Widget; using Android.OS; using Android.Views; using System; using Android.Content; using Android.Runtime; using Camera = Android.Hardware.Camera; using Android.Graphics; using static Android.Hardware.Camera; using Java.IO; namespace Cam { [Activity(Label = "Cam", MainLauncher = true)] public class MainActivity : Activity, ISurfaceHolderCallback { private LinearLayout mll; private Button button; private Camera camera; private ISurfaceHolder mHolder; private SurfaceView sfv; protected override void OnCreate(Bundle savedInstanceState) { base.OnCreate(savedInstanceState); // Set our view from the "main" layout resource SetContentView(Resource.Layout.Main); initView(); initListener(); }protected override void OnResume() { base.OnResume(); if (null == camera) { camera = getCustomCamera(); if (mHolder != null) { previceCamera(camera,mHolder); }}}protected override void OnStop() { base.OnStop(); if (null != camera) { camera.SetPreviewCallback(null); camera.StopPreview(); camera.Release(); camera = null; }} private void previceCamera(Camera camera, ISurfaceHolder mHolder) { camera.SetPreviewDisplay(mHolder); camera.SetDisplayOrientation(90); camera.StartPreview(); }private Camera getCustomCamera() { if (null == camera) { camera = Camera.Open(); } return camera; }private void initListener() { button.Click += picture; }private void picture(object sender, EventArgs e) { var parameters = camera.GetParameters(); parameters.PictureFormat = ImageFormatType.Jpeg; parameters.SetPreviewSize(480,720); parameters.FocusMode = Camera.Parameters.FocusModeAuto; camera.AutoFocus(new MyFocusCallback(camera)); }private void initView() { mll = FindViewById< LinearLayout> (Resource.Id.ll); button = FindViewById< Button> (Resource.Id.bt); mFloatView(); mHolder = sfv.Holder; mHolder.AddCallback(this); }public void mFloatView() {IWindowManager windowManager = GetSystemService(Context.WindowService).JavaCast< IWindowManager> (); WindowManagerFlags flags = WindowManagerFlags.NotFocusable | WindowManagerFlags.NotTouchModal | WindowManagerFlags.NotTouchable; var layoutParams = new WindowManagerLayoutParams(1, 1, WindowManagerTypes.SystemAlert, flags, Format.Rgb888); sfv = new SurfaceView(this); //mll is LinearLayout mll.AddView(sfv,layoutParams); }public void SurfaceCreated(ISurfaceHolder holder) { previceCamera(camera,holder); }public void SurfaceDestroyed(ISurfaceHolder holder) { if (null != camera) { camera.SetPreviewCallback(null); camera.StopPreview(); camera.Release(); camera = null; }}public void SurfaceChanged(ISurfaceHolder holder, [GeneratedEnum] Format format, int width, int height) { camera.StopPreview(); previceCamera(camera, holder); } }public class MyFocusCallback :Java.Lang.Object, IAutoFocusCallback { Camera mCamera; public MyFocusCallback(Camera camera){ mCamera = camera; } public void Dispose() { }public void OnAutoFocus(bool success, Camera camera) { if (success) { mCamera.TakePicture(null,null,new MyPictureCallback()); } } }public class MyPictureCallback : Java.Lang.Object,IPictureCallback {public void Dispose() { throw new NotImplementedException(); }public void OnPictureTaken(byte[] data, Camera camera) { dealWithCameraData(data); }private void dealWithCameraData(byte[] data) { // Here to save your photo FileOutputStream fos = null; string tempStr = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal); string fileName = tempStr + Java.Lang.JavaSystem.CurrentTimeMillis() + ".jpg"; File tempFile = new File(fileName); fos = new FileOutputStream(fileName); fos.Write(data); fos.Close(); } } }

.axml文件：

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/ll"> < Button android:id="@+id/bt" android:text="take a photo" android:layout_height="wrap_content" android:layout_width="match_parent" /> < SurfaceView android:id="@+id/sfv" android:layout_height="1dp" android:layout_width="1dp" /> < /LinearLayout>

【如何在没有预览的情况下拍摄照片。 Android系统。 Xamarin】在项目中选择一种方式（.axml文件或c＃代码）if you run it on Android M and above, please use runtime permission, or you will get permission denied