我无法在 API <=22（使用 Android Studio 和 Unity）的设备中启动手电筒。为什么？

Question

嗨，朋友们，我正在尝试在 unity.From 文档中制作 torch 应用程序，我注意到 setTorchMode() 仅在我们有 API>22 时才适用。它适用于 API>22.But 以下 API<23 我已关注。但即使我的应用程序没有在 API<23 中盯着火炬。从 Logcat 我追踪到 CameraService: Permission Denial: can't use the camera

详细错误报告：

08-18 09:27:22.343 758-835/? I/ActivityManager: Killing 
14121:com.google.android.partnersetup/u0a7 (adj 15): DHA:empty #19
08-18 09:27:22.343 196-2615/? W/ServiceManager: Permission failure: 
android.permission.CAMERA from uid=10242 pid=14010
08-18 09:27:22.343 196-2615/? E/CameraService: Permission Denial: can't 
use the camera pid=14010, uid=10242
08-18 09:27:22.343 14010-14051/? W/CameraBase: An error occurred while 
connecting to camera: 0
08-18 09:27:22.353 14010-14051/? E/ContentValues: TorchMode: 
java.lang.RuntimeException: Fail to connect to camera service
`enter code here`at android.hardware.Camera.<init>(Camera.java:568)
 at android.hardware.Camera.open(Camera.java:426)
 at 
com.mugames.torchlibrary.AndroidTrochClass.TorchMode
(AndroidTrochClass.java:64)
at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
at com.unity3d.player.UnityPlayer.access0(Unknown Source)
at com.unity3d.player.UnityPlayer$e.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:145)
at com.unity3d.player.UnityPlayer$e.run(Unknown Source)

这是我的 C#（Unity 代码）

private void Awake()
{
    if(!Permission.HasUserAuthorizedPermission(Permission.Camera))
    {
        Permission.RequestUserPermission(Permission.Camera);
    }
}

void Start()
{
    AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
    AndroidJavaObject activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
    AndroidJavaObject context = activity.Call<AndroidJavaObject>("getApplicationContext");
    javaObject = new AndroidJavaObject("com.mugames.torchlibrary.AndroidTrochClass");
    javaObject.Call("Init", context);
    javaObject.Call("TorchMode", true);
}

还有我的 Java 代码（JAVA class 的名称是 AndroidTrochClass） API<23

        try {
            if(camera== null && parameters==null) {
                camera = Camera.open();
                parameters = camera.getParameters();

                List<String> modesAvailable = parameters.getSupportedFlashModes();
                if (modesAvailable.contains(Camera.Parameters.FLASH_MODE_TORCH)) {
                    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                } else if (modesAvailable.contains((Camera.Parameters.FLASH_MODE_ON))) {
                    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
                } else {
                    Log.d("Unity", "No Flash Available");
                }
                camera.setParameters(parameters);
            }
            if (state) {
                camera.startPreview();
            } else {
                camera.stopPreview();
            }
        }
        catch (Exception e)
        {
            Log.e(TAG, "TorchMode: ",e);
            e.printStackTrace();
        }

注意：我正在使用 Java Class 就像插件一样所以 Java Class 没有扩展所以我已经将当前上下文传递给 Java方法

Answer 1

找到！！我需要在清单文件中添加相机权限 ;)

我无法在 API <=22（使用 Android Studio 和 Unity）的设备中启动手电筒。为什么？

I can't start torch in device with API <=22(Used Android Studio and Unity) .why?

java

plugins

android

unity3d

android-studio