訪問來自Unity的Android Camera.Parameters

Question

我想從android設備獲取攝像頭的數量，檢查是否有背光，並且該攝像頭的水平和垂直視角爲Camera.Parameters.getHorizontalViewAngle()。

我想從Unity3D c＃腳本做到這一點，但我的Java技能是有限的。任何人都可以提供任何幫助嗎？ 我有這樣的代碼：

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 

但不能連getNumberOfCameras()通話作品。

Answer 1

getNumberOfCameras是一個靜態方法，所以你需要CallStatic你的「cameraClass」

有一個在「android.hardware.Camera」不「getCamera的」方法（或者至少在文檔中我找不到它） 。你應該使用'Camera.open'來代替，但是有一個技巧。 'Camera.open'需要您的應用程序具有攝像機權限，除非您使用內置攝像頭功能，否則這些攝像頭權限不是由Unity生成的。

在Android ICS以下工作：

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