从Unity访问Android Camera.Parameters

时间:2013-08-26 18:17:04

标签: android unity3d

我想从Android设备获取相机的数量,检查是否有背面,并且该相机获得水平和垂直视角Camera.Parameters.getHorizontalViewAngle()

我想从Unity3D c#脚本中执行此操作,但我的java技能有限。任何人都可以提供任何帮助吗? 我有这段代码:

using UnityEngine;

#if UNITY_ANDROID
public class CameraParametersAndroid
{
    public static float HorizontalViewAngle { get; protected set; }
    public static float VerticalViewAngle   { get; protected set; }
    public static int   numCameras          { get; protected set; }

    static CameraParametersAndroid()
    {
        AndroidJavaClass unityPlayerClass = new AndroidJavaClass ("com.unity3d.player.UnityPlayer"),
                         cameraClass = new AndroidJavaClass ("android.hardware.Camera"),
                         cameraParametersClass = new AndroidJavaClass ("android.hardware.Camera.Parameters"),
                         cameraInfoClass = new AndroidJavaClass ("android.hardware.Camera.CameraInfo");

        AndroidJavaObject currentActivity = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity");
        object[] args = {currentActivity};

        AndroidJavaObject camera = cameraClass.CallStatic<AndroidJavaObject>("getCamera", args);

        if (camera != null)
        {
            AndroidJavaObject cameraParameters = camera.Call<AndroidJavaObject>("getParameters");

            numCameras = camera.Call<int>("getNumberOfCameras");
            HorizontalViewAngle = cameraParameters.Call<float>("getHorizontalViewAngle");
            VerticalViewAngle   = cameraParameters.Call<float>("getVerticalViewAngle");

        }
        else
        {
            Debug.LogError("[CameraParametersAndroid] Camera not available");
        }
    }
}
#endif

但即使getNumberOfCameras()来电也无效。

1 个答案:

答案 0 :(得分:4)

getNumberOfCameras是一种静态方法,所以你需要CallStatic你的'cameraClass'

'android.hardware.Camera'中没有'getCamera'方法(或者至少我在文档中找不到它)。你应该使用'Camera.open',但有一个技巧。 “Camera.open”要求您的应用具有相机权限,除非您使用内置相机功能,否则Unity不会生成相机权限。

以下适用于Android ICS:

using UnityEngine;

#if UNITY_ANDROID
public class CameraParametersAndroid
{
    public static float HorizontalViewAngle { get; protected set; }
    public static float VerticalViewAngle { get; protected set; }
    public static int numCameras { get; protected set; }

    static CameraParametersAndroid()
    {
        AndroidJavaClass cameraClass = new AndroidJavaClass("android.hardware.Camera");

        numCameras = cameraClass.CallStatic<int>("getNumberOfCameras");

        // This is an ugly hack to make Unity
        // generate Camera permisions
        WebCamDevice[] devices = WebCamTexture.devices;

        // Camera.open gets back-facing camera by default
        // you should check for exceptions
        int camID = 0;
        AndroidJavaObject camera = cameraClass.CallStatic<AndroidJavaObject>("open", camID);

        // I'm pretty sure camera will never be null at this point
        // It will either be a valid object or Camera.open would throw an exception
        if (camera != null)
        {
            AndroidJavaObject cameraParameters = camera.Call<AndroidJavaObject>("getParameters");
            HorizontalViewAngle = cameraParameters.Call<float>("getHorizontalViewAngle");
            VerticalViewAngle = cameraParameters.Call<float>("getVerticalViewAngle");

        }
        else
        {
            Debug.LogError("[CameraParametersAndroid] Camera not available");
        }
    }
}
#endif