Kotlin - unresolved reference for constant
我正在尝试为我的android应用程序使用新相机硬件API(android.hardware.camera2)的示例代码。首先，我通过Android Studio的Kotlin插件的自动转换功能将Java代码转换为Kotlin代码。下面是一段转换后的代码：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | private val mCaptureCallback = object : CameraCaptureSession.CaptureCallback() { private fun process(result: CaptureResult) { when (mState) { STATE_PREVIEW -> { }// We have nothing to do when the camera preview is working normally. STATE_WAITING_LOCK -> { val afState = result.get(CaptureResult.CONTROL_AF_STATE) if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState || CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED == afState) { // CONTROL_AE_STATE can be null on some devices val aeState = result.get<Int>(CaptureResult.CONTROL_AE_STATE) if (aeState == null || aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) { mState = STATE_WAITING_NON_PRECAPTURE captureStillPicture() } else { runPrecaptureSequence() } } } STATE_WAITING_PRECAPTURE -> { // CONTROL_AE_STATE can be null on some devices val aeState = result.get<Int>(CaptureResult.CONTROL_AE_STATE) if (aeState == null || aeState == CaptureResult.CONTROL_AE_STATE_PRECAPTURE || aeState == CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED) { mState = STATE_WAITING_NON_PRECAPTURE } } STATE_WAITING_NON_PRECAPTURE -> { // CONTROL_AE_STATE can be null on some devices val aeState = result.get<Int>(CaptureResult.CONTROL_AE_STATE) if (aeState == null || aeState != CaptureResult.CONTROL_AE_STATE_PRECAPTURE) { mState = STATE_PICTURE_TAKEN captureStillPicture() } } } } |
我收到以下未解决的参考错误：
1 2 3 4 5 | CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED CaptureResult.CONTROL_AE_STATE_CONVERGED CaptureResult.CONTROL_AE_STATE_PRECAPTURE CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED |
但是这些常量在原始Java代码中可以识别。这些错误有解决方案吗？
这些变量在CameraMetadata中声明。在Kotlin中，不能在子类上调用静态变量和方法。