谁能告诉我我做错了什么...我想使用 SurfaceView 捕捉我有预览屏幕的图像。我能够在表面 View 上显示预览。

这是我捕获图像的代码

if (mCameraSession == null && mCameraDevice == null) return;

    ImageReader reader = ImageReader.newInstance(mTexturePreviewSize.getWidth(),
                            mTexturePreviewSize.getHeight(),
                            ImageFormat.JPEG, 1);
    reader.setOnImageAvailableListener(imageAvailableListener, mBackgroundHandler);

    Surface surface = reader.getSurface();
    try {

        CaptureRequest.Builder requestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
        requestBuilder.addTarget(surface);
        mCameraSession.capture(requestBuilder.build(), sessionCaptureListener, null);

以下是我收到的错误信息。

java.lang.IllegalArgumentException: Bad argument passed to camera service
        at android.hardware.camera2.utils.CameraBinderDecorator.throwOnError(CameraBinderDecorator.java:114)
        at android.hardware.camera2.utils.CameraBinderDecorator$CameraBinderDecoratorListener.onAfterInvocation(CameraBinderDecorator.java:73)
        at android.hardware.camera2.utils.Decorator.invoke(Decorator.java:81)
        at java.lang.reflect.Proxy.invoke(Proxy.java:397)
        at $Proxy2.submitRequestList(Unknown Source)
        at android.hardware.camera2.impl.CameraDeviceImpl.submitCaptureRequest(CameraDeviceImpl.java:617)
        at android.hardware.camera2.impl.CameraDeviceImpl.capture(CameraDeviceImpl.java:503)
        at android.hardware.camera2.impl.CameraCaptureSessionImpl.capture(CameraCaptureSessionImpl.java:161)
        at Control.CameraApi21Plus.captureSinglePhoto(CameraApi21Plus.java:171)
        at com.CameraActivity$2.onClick(CameraActivity.java:108)

捕捉单张照片功能:

   public void captureSinglePhoto() {

    if (mCameraSession == null && mCameraDevice == null) return;

    ImageReader reader = ImageReader.newInstance(mTexturePreviewSize.getWidth(),
            mTexturePreviewSize.getHeight(),
            ImageFormat.JPEG, 1);
    reader.setOnImageAvailableListener(imageAvailableListener, mBackgroundHandler);

    Surface surface = reader.getSurface();
    try {

        CaptureRequest.Builder requestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
        requestBuilder.addTarget(surface);

        mCameraSession.stopRepeating();
        mCameraSession.capture(requestBuilder.build(), sessionCaptureListener, null);

    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}

private ImageReader.OnImageAvailableListener imageAvailableListener = new ImageReader.OnImageAvailableListener()
{
    @Override
    public void onImageAvailable(ImageReader reader) {
        Image img = reader.acquireLatestImage();
    }
};

private CameraCaptureSession.CaptureCallback sessionCaptureListener = new CameraCaptureSession.CaptureCallback() {
    @Override
    public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {
        //super.onCaptureCompleted(session, request, result);
    }
};

最佳答案

您只能捕获到为 session 配置的表面，因此您应该在创建 session 之前准备好表面。

在官方文档中:

IllegalArgumentException if the request targets no Surfaces or Surfaces that are not configured as outputs for this session; ...

就像那里一样，您需要在创建 session 时准备好表面 mImageReader.getSurface()

           mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),
                new CameraCaptureSession.StateCallback() {
                    ...
                }, null);

官方样本:

https://github.com/googlesamples/android-Camera2Basic/tree/master/Application/src/main/java/com/example/android/camera2basic

关于Android:Camera2 传递给相机服务的错误参数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32516539/