Question

我已经创建了一种可能的方法，以便我可以通过一个简单的列表检测哪个参数适合每个手机。现在，当我运行它时，粉碎，

public void turnOn() {

就在这一行：List<String> flashMods = params.getSupportedFlashModes();

                 if (flashMods.contains(android.hardware.Camera.Parameters.FLASH_MODE_AUTO)) {

                    params = mCamera.getParameters();
                    params.setFlashMode(Camera.Parameters.FLASH_MODE_AUTO);
                    mCamera.setParameters(params);
                    mCamera.startPreview();
                    on = true;
                  Toast.makeText(getApplicationContext(), 
                            "2",
                             Toast.LENGTH_SHORT).show();
                    }
                     if(flashMods.contains(android.hardware.Camera.Parameters.FLASH_MODE_ON)) {

                        params = mCamera.getParameters();
                        params.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
                        mCamera.setParameters(params);
                        mCamera.startPreview();
                        on = true;
                  Toast.makeText(getApplicationContext(), 
                            "3",
                             Toast.LENGTH_SHORT).show();
                        }
                    if(flashMods.contains(android.hardware.Camera.Parameters.FLASH_MODE_TORCH)) {

                        params = mCamera.getParameters();
                        params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                        mCamera.setParameters(params);
                        mCamera.startPreview();
                        on = true;

                  Toast.makeText(getApplicationContext(), 
                            "4",
                             Toast.LENGTH_SHORT).show();
                        }
                     if(flashMods.contains(android.hardware.Camera.Parameters.FLASH_MODE_RED_EYE)) {

                         params = mCamera.getParameters();
                         params.setFlashMode(Camera.Parameters.FLASH_MODE_RED_EYE);
                         mCamera.setParameters(params);
                         mCamera.startPreview();
                         on = true;
                  Toast.makeText(getApplicationContext(), 
                            "5",
                             Toast.LENGTH_SHORT).show();
                        }
            }

    }

提前致谢！

Answer 1

您是否启用了“CAMERA”权限？

您是否已指定params对象 - 它可能为null。

我这样做（在Mono / C＃中，而不是Java，我害怕）：

private void SetUpCamera()
    {
        if (m_camera == null)
            m_camera = Android.Hardware.Camera.Open();

        var holder = m_surface.Holder;
        holder.AddCallback(this);
        holder.SetType(Android.Views.SurfaceType.PushBuffers);
        SetCameraDisplayOrientation();
        GetSurfaceSize(m_camera.GetParameters());
        GetFlashModes(m_camera.GetParameters());

    }

然后：

private void GetFlashModes(Android.Hardware.Camera.Parameters parameters)
    {
        IList<String> flashModes = parameters.SupportedFlashModes;

        m_flashModes = new List<string>();

        if (flashModes == null)//not supported
            return;

        foreach (string mode in flashModes)
            m_flashModes.Add(mode);

        if (m_currentMode != null)//mode has been saved, need to set it to this mode
            SetFlashMode(m_currentMode);
        else
            m_currentMode = GetFlashMode();
    }

检测相机手机参数

1 个答案: