我正在使用Xamarin / Android（不是Forms），试图将camera2basic api示例集成到我的项目中。 https://developer.xamarin.com/samples/monodroid/android5.0/Camera2Basic/
我在示例中没有改变任何内容，我只对使用主摄像头感兴趣，只拍摄快照。
我的项目有一个MainActivity，而camera2是我正在调用的片段之一：
string fragmentTag = this.Resources.GetString(Resource.String.camera_form);
// Begin the transaction
FragmentTransaction trans = this.FragmentManager.BeginTransaction();
// Replace the old fragment with the new one.
trans.Add(Resource.Id.fragment_container, camera2BasicFragment, fragmentTag);
// Add the transaction to the back stack.
// The tag is added so we can use PopBackStack to skip a screen on the back key
trans.AddToBackStack(fragmentTag);
// Don't forget to commit
trans.Commit();
一切都是第一次工作。它需要一张照片并将其保存到文件夹中。
第二次运行它时，它会显示预览，然后当我拍照时它会在这里崩溃，其中投掷是：
public void CaptureStillPicture()
{
try
{
var activity = Activity;
if (null == activity || null == mCameraDevice)
{
return;
}
// This is the CaptureRequest.Builder that we use to take a picture.
if (stillCaptureBuilder == null)
stillCaptureBuilder = mCameraDevice.CreateCaptureRequest(CameraTemplate.StillCapture);
stillCaptureBuilder.AddTarget(mImageReader.Surface);
// Use the same AE and AF modes as the preview.
stillCaptureBuilder.Set(CaptureRequest.ControlAfMode, (int)ControlAFMode.ContinuousPicture);
SetAutoFlash(stillCaptureBuilder);
// Orientation
int rotation = (int)activity.WindowManager.DefaultDisplay.Rotation;
stillCaptureBuilder.Set(CaptureRequest.JpegOrientation, GetOrientation(rotation));
mCaptureSession.StopRepeating();
try
{
mCaptureSession.Capture(stillCaptureBuilder.Build(), new CameraCaptureStillPictureSessionCallback(this), null);
}
catch (System.Exception e)
{
throw;
}
}
catch (CameraAccessException e)
{
e.PrintStackTrace();
}
}
出现此错误：
{Java.Lang.IllegalArgumentException: CaptureRequest contains unconfigured Input/Output Surface!
at Java.Interop.JniEnvironment+InstanceMethods.CallIntMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in <286213b9e14c442ba8d8d94cc9dbec8e>:0
at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeAbstractInt32Method (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00014] in <286213b9e14c442ba8d8d94cc9dbec8e>:0
at Android.Hardware.Camera2.CameraCaptureSessionInvoker.Capture (Android.Hardware.Camera2.CaptureRequest request, Android.Hardware.Camera2.CameraCaptureSession+CaptureCallback listener, Android.OS.Handler handler) [0x00078] in <b781ed64f1d743e7881ac038e0fbdf85>:0
at RvsMobileApp.Activities.Camera2BasicFragment.CaptureStillPicture () [0x000b7] in C:\Source\RVS\rvs-mobile-app\src\Rvs.Mobile.App\Activities\Camera2BasicFragment.cs:807
--- End of managed Java.Lang.IllegalArgumentException stack trace ---
java.lang.IllegalArgumentException: CaptureRequest contains unconfigured Input/Output Surface!
at android.hardware.camera2.CaptureRequest.convertSurfaceToStreamId(CaptureRequest.java:674)
at android.hardware.camera2.impl.CameraDeviceImpl.submitCaptureRequest(CameraDeviceImpl.java:1066)
at android.hardware.camera2.impl.CameraDeviceImpl.capture(CameraDeviceImpl.java:936)
at android.hardware.camera2.impl.CameraCaptureSessionImpl.capture(CameraCaptureSessionImpl.java:173)
at md5bbb797339b35f7667da89d6634e22c37.CameraCaptureListener.n_onCaptureCompleted(Native Method)
at md5bbb797339b35f7667da89d6634e22c37.CameraCaptureListener.onCaptureCompleted(CameraCaptureListener.java:37)
at android.hardware.camera2.impl.CameraCaptureSessionImpl$1.lambda$onCaptureCompleted$3(CameraCaptureSessionImpl.java:640)
at android.hardware.camera2.impl.-$$Lambda$CameraCaptureSessionImpl$1$OA1Yz_YgzMO8qcV8esRjyt7ykp4.run(Unknown Source:8)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:214)
at android.os.HandlerThread.run(HandlerThread.java:65)
}
base: {Java.Lang.RuntimeException}
JniPeerMembers: {Android.Runtime.XAPeerMembers}
起初我以为是内存泄漏，所以我确保我的片段自杀了。以下是按下完成按钮后片段的结束方式：
case Resource.Id.camera_finished:
// EventHandler<DialogClickEventArgs> nullHandler = null;
Activity activity = Activity;
if (activity != null)
{
// Send all of the data to the service
// SendPhotosAndDataToService();
// Call the paren activitity's back to END this Fragment
activity.FragmentManager.BeginTransaction().Remove(this).CommitNow();
//activity.OnBackPressed();
}
break;
以下是重现错误的步骤：
启动相机（加载片段）查看预览拍照返回主要活动（关闭片段）
启动相机（加载片段）查看预览拍照片CRASH !!!
只要我不拍任何照片，我就可以根据需要多次装载和卸载碎片。
我用Google搜索“CaptureRequest包含未配置的输入/输出表面！”，并没有获得足够的信息来真正理解问题。我觉得有些东西在第一次运行后没有清理干净。我几天来一直在研究这个问题。
恢复相机片段时，仍然重新初始化了StillCaptureBuilder。更好的是，确保在碎片被破坏时清理stillCaptureBuilder。
正如Alex Cohn指出的那样，当我读到这篇文章时我发现：https://hofmadresu.com/2018/09/11/android-camera2-trials-and-tribulations.html
这是一个优秀的资源BTW，示例代码没有发布stillCaptureBuilder，所以它可以第二次使用。
public void CaptureStillPicture()
{
try
{
var activity = Activity;
if (null == activity || null == mCameraDevice)
{
return;
}
// THIS WAS NOT RELEASING THE RESOURCES AND SHOULD BE REMOVED FROM THE SAMPLE!
//// This is the CaptureRequest.Builder that we use to take a picture.
////if (stillCaptureBuilder == null)
//// stillCaptureBuilder = mCameraDevice.CreateCaptureRequest(CameraTemplate.StillCapture);
// This is the proper code
var stillCaptureBuilder = mCameraDevice.CreateCaptureRequest(CameraTemplate.StillCapture);
stillCaptureBuilder.AddTarget(mImageReader.Surface);
// Use the same AE and AF modes as the preview.
stillCaptureBuilder.Set(CaptureRequest.ControlAfMode, (int)ControlAFMode.ContinuousPicture);
SetAutoFlash(stillCaptureBuilder);
// Orientation
int rotation = (int)activity.WindowManager.DefaultDisplay.Rotation;
stillCaptureBuilder.Set(CaptureRequest.JpegOrientation, GetOrientation(rotation));
mCaptureSession.StopRepeating();
mCaptureSession.AbortCaptures();
try
{
mCaptureSession.Capture(stillCaptureBuilder.Build(), new CameraCaptureStillPictureSessionCallback(this), null);
}
catch (System.Exception e)
{
throw;
}
}
catch (CameraAccessException e)
{
e.PrintStackTrace();
}
}
我正在记录这个，所以任何与camera2斗争的人都可以学习。一如既往地谢谢你