//非法按键
private static final int INVALID_POINTER = -1;

//dispatch方法记录第一次按下的x
private float mInitialDisPatchDownX;

//dispatch方法记录第一次按下的y
private float mInitialDisPatchDownY;

//dispatch方法记录的手指
private int mActiveDispatchPointerId = INVALID_POINTER;

//是否请求拦截
private boolean hasRequestDisallowIntercept = false;

@Override
public void requestDisallowInterceptTouchEvent(boolean b) {
  hasRequestDisallowIntercept = b;
  // Nope.
}

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
  switch (ev.getAction()) {
    case MotionEvent.ACTION_DOWN:
      mActiveDispatchPointerId = MotionEventCompat.getPointerId(ev, 0);
      final float initialDownX = getMotionEventX(ev, mActiveDispatchPointerId);
      if (initialDownX != INVALID_POINTER) {
        mInitialDisPatchDownX = initialDownX;
      }
      final float initialDownY = getMotionEventY(ev, mActiveDispatchPointerId);
      if (mInitialDisPatchDownY != INVALID_POINTER) {
        mInitialDisPatchDownY = initialDownY;
      }
      break;
    case MotionEvent.ACTION_MOVE:
      if (hasRequestDisallowIntercept) {
        //解决viewPager滑动冲突问题
        final float x = getMotionEventX(ev, mActiveDispatchPointerId);
        final float y = getMotionEventY(ev, mActiveDispatchPointerId);
        if (mInitialDisPatchDownX != INVALID_POINTER && x != INVALID_POINTER &&
            mInitialDisPatchDownY != INVALID_POINTER && y != INVALID_POINTER) {
          final float xDiff = Math.abs(x - mInitialDisPatchDownX);
          final float yDiff = Math.abs(y - mInitialDisPatchDownY);
          if (xDiff > mTouchSlop && xDiff * 0.7f > yDiff) {
            //横向滚动不需要拦截
            super.requestDisallowInterceptTouchEvent(true);
          } else {
            super.requestDisallowInterceptTouchEvent(false);
          }
        } else {
          super.requestDisallowInterceptTouchEvent(false);
        }
      }
      break;
    case MotionEvent.ACTION_UP:
    case MotionEvent.ACTION_CANCEL:
      if (ev.getAction() == MotionEvent.ACTION_UP || ev.getAction() == MotionEvent.ACTION_CANCEL) {
        hasRequestDisallowIntercept = false;
      }
      break;
  }

  return super.dispatchTouchEvent(ev);
}

private float getMotionEventY(MotionEvent ev, int activePointerId) {
  final int index = MotionEventCompat.findPointerIndex(ev, activePointerId);
  if (index < 0) {
    return -1;
  }
  return MotionEventCompat.getY(ev, index);
}

private float getMotionEventX(MotionEvent ev, int activePointerId) {
  final int index = MotionEventCompat.findPointerIndex(ev, activePointerId);
  if (index < 0) {
    return -1;
  }
  return MotionEventCompat.getX(ev, index);
}