android - 2手指在android中滑动

Question

我尝试使用 SimpleOnGestureListener 的 onFling 方法实现两指滑动。但是，我发现 SimpleOnGestureListener 不支持双指触摸。

我该如何解决？

Answer 1

我的解决方案有效，但使用公共(public)静态 int 来计算手指的数量非常难看。在我用两根手指猛击后，我不得不将 fingercount 设置回一个，因为我无法再获得一根手指的 action_pointer_down ......我不知道为什么......但这个解决方案也适用于更多手指......希望有人可以使用它在功能中

public class RemoteFragment extends Fragment{

public static int fingercount = 1;    

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    final GestureDetector gdt = new GestureDetector(getActivity(),
            new RemoteGestureListener());

    View view = inflater.inflate(R.layout.gestures, container, false);

    view.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(final View view, final MotionEvent event) {
            int action = event.getAction();

            switch (action & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_POINTER_DOWN:
                Log.d(TAG,
                        "Pointer-Count ="
                                + String.valueOf(fingerCount = event
                                        .getPointerCount()));

                break;
            }
            gdt.onTouchEvent(event);
            return true;
        }
    });
    return view;
}
}

public class RemoteGestureListener implements OnGestureListenerr {

private final static String TAG = "RemoteGestureListener";

private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;


public RemoteGestureListener() {
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
        float velocityY) {

    Log.d(TAG, "onFling");
    if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
            && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
        if (RemoteFragment.fingerCount == 1) {
            Log.d(TAG, "Left Swipe");
        } else {
            Log.d(TAG, "Left xFinger Swipe");
            RemoteFragment.fingerCount = 1;
        }
        return true; // Right to left
    } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
            && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
        if (RemoteFragment.fingerCount == 1) {
            Log.d(TAG, "Right Swipe");
        } else {
            Log.d(TAG, "Right xFinger Swipe");
            RemoteFragment.fingerCount = 1;
        }
        return true; // Left to right
    }

    if (e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE
            && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
        if (RemoteFragment.fingerCount == 1) {
            Log.d(TAG, "Top Swipe");
        } else {
            Log.d(TAG, "Top xFinger Swipe");
            RemoteFragment.fingerCount = 1;
        }
        return true; // Bottom to top
    } else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE
            && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
        if (RemoteFragment.fingerCount == 1) {
            Log.d(TAG, "Bottom Swipe");
        } else {
            Log.d(TAG, "Bottom xFinger Swipe");
            RemoteFragment.fingerCount = 1;
        }
        return true;
    }
    return true;
}