没有相机权限无法打开相机“0”

Question

我的清单中有以下内容

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.CAMERA" />

但是我收到这个错误

An error occurred while connecting to camera 0: Status(-8, EX_SERVICE_SPECIFIC): '1: validateClientPermissionsLocked:1165: Caller ... (PID 10153, UID 6049) cannot open camera "0" without camera permission'

我正在尝试使用此代码让相机正常工作

public static Camera getCameraInstance(){
    Camera c = null;
    try {
        c = Camera.open();
    } catch (Exception e) {
        Log.e("getCameraInstance", "exception", e);
    }
    return c; // returns null if camera is unavailable
}

如何让这款相机正常工作？

Answer 1

需要在运行时启用权限。当0索引的摄像头没有权限时，会输出上述错误。向清单添加权限并不是在手机上启用它的原因......下面的代码可以。

    public static void checkCameraPermissions(Context context){
        if (ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED)
        {
            // Permission is not granted
            Log.d("checkCameraPermissions", "No Camera Permissions");
            ActivityCompat.requestPermissions((Activity) context,
                    new String[] { Manifest.permission.CAMERA },
                    100);
        }
    }