CameraDevice无法创建会话[Camera2]

Question

我正在尝试使用Camera2API将相机数据流式传输到SurfaceView.我正在按照本指南:Camera2指南

我无法过去 step 5

MainActivity.java::onCreate()

setContentView(R.layout.activity_main);

surfaceView = (SurfaceView)findViewById(R.id.surface);
manager = (CameraManager)getSystemService(Context.CAMERA_SERVICE);

MainActivity.java::onClick()

for (String id : manager.getCameraIdList()) {
    CameraCharacteristics characteristics = manager.getCameraCharacteristics(id);

    Integer direction = characteristics.get(CameraCharacteristics.LENS_FACING);

    if (direction != null && direction == CameraCharacteristics.LENS_FACING_BACK) {
        if (checkCallingOrSelfPermission("android.permission.CAMERA") == PackageManager.PERMISSION_GRANTED)
            manager.openCamera(id, new StateCallback(), null);

        break;
    }
}

MainActivity.java.StateCallback :: onOpened(CameraDevice摄像头)

List<Surface> surfaces = new LinkedList<>();
surfaces.add(surfaceView.getHolder().getSurface());

CaptureRequest.Builder builder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
builder.addTarget(surfaces.get(0));

camera.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {
    @Override
    public void onConfigured(CameraCaptureSession session) {
        Log.i(TAG, "Configured");
    }

    @Override
    public void onConfigureFailed(CameraCaptureSession session) {
        Log.e(TAG, "Configured failed"); // Ends up in this function :(
    }
    }, null);

该程序最终在onConfigureFailed()函数中.我不知道可能是什么错误,我不知道如何检查是什么.

我的猜测是我错过了什么CaptureRequest,但我不知道是什么.

我正在运行三星Galaxy S4.

Answer 1

添加到 onConfigured：

  if (null == cameraDevice) {
        Log.e(TAG, "updatePreview error, return");
        return;
    }
    captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
    try {
        cameraCaptureSessions.setRepeatingRequest(captureRequestBuilder.build(), null, mBackgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }