java - Leap Motion Listener onFrame 正在跳过/忽略代码

Question

我正在用 Java 为 Leap 开发自定义手势创建应用程序。在 onFrame 函数中，代码被执行到某个点，其余代码被跳过。

onFrame 的代码如下:

public void onFrame(Controller controller) {
    Frame frame = controller.frame();
    if (recordableFrame(frame, minRecordingVelocity)){

        /*
         * If this is the first frame in a gesture, we clean up some running         values
         */
        if (!recording) { 
            recording = true; 
            frameCount = 0;
        }

        frameCount++;
        System.out.println("in frame... " + Integer.toString(frameCount));
        recordFrame(frame);
        System.out.println("Recording Frame...");
    }    
}

一切正常，直到调用“recordFrame(frame) 函数。此函数和此函数之后 onFrame 中的任何代码都被忽略/未执行。我似乎没有跳帧，而是在跳过代码。

recordFrame的代码如下:

/**
 * This function is called for each frame during gesture recording, 
 * and it is responsible for adding values in frames using the provided 
 * recordPoint function (which accepts a Vector).
 */
public void recordFrame(Frame frame) {
    HandList hands = frame.hands();
    int handCount = hands.count();

    Hand hand; 
    Finger finger; 
    FingerList fingers; 
    int fingerCount;

    int l = handCount;
    for (int i = 0; i < l; i++) {   //for each hand in the frame
        hand = hands.get(i);

        recordPoint(hand.stabilizedPalmPosition()); //record the palm position

        fingers = hand.fingers();
        fingerCount = fingers.count();

        int k = fingerCount;
        for (int j = 0; j < k; j++) {  //for each finger in the hand
            finger = fingers.get(j);
            recordPoint(finger.stabilizedTipPosition();//record fingertip position.
        }
    }
    System.out.println("Recording Frame...");
}

Answer 1

来自 Leap Motion 论坛:

“我发现了这个问题。在手势类中我声明了 ArrayList 但从未使用 = new ArrayList(); 初始化它(很奇怪它没有抛出编译器错误)

完成后一切正常。我现在已经让它工作并运行了。”

https://community.leapmotion.com/t/listener-onframe-is-skipping-code/3108/7