CoverFlowLayoutManger中mSlectPositon计算存在bug

[WhySRZ]

CoverFlowLayoutManger中mSlectPositon计算存在bug
private void onSelectedCallBack() {
mSelectPosition = Math.round (mOffsetAll / getIntervalDistance());
mSelectPosition = Math.abs(mSelectPosition % getItemCount());
if (mSelectedListener != null && mSelectPosition != mLastSelectPosition) {
mSelectedListener.onItemSelected(mSelectPosition);
}
mLastSelectPosition = mSelectPosition;
}

当mSelectPositon为负数时，会出现位置对不上，比如我有5个条目，当mSelectPosition为-6，Math.abs(mSelectPosition % getItemCount())计算结果为1，但事实对应的条目应该是4，当mSelectPosition为负数时正确的位置计算应该为应为
mSelectPosition = 条目个数和（list.size()）+mSelectPosition % getItemCount()

[zt80hou]

list.size()）+mSelectPosition % getItemCount()

牛逼，但是还有一种偶现情况 为负数的时候，计算完mSelectPosition =getItemCount()，此时应该置位0，还需要再优化。

[zt80hou]

/**
* 计算当前选中位置，并回调
*/
private void onSelectedCallBack() {
mSelectPosition = Math.round(mOffsetAll / getIntervalDistance());
Log.e("mSelectPosition", "mSelectPosition = " + mSelectPosition);
if (mSelectPosition < 0) {
mSelectPosition = getItemCount() + mSelectPosition % getItemCount();
} else {
mSelectPosition = Math.abs(mSelectPosition % getItemCount());
}
if (mSelectPosition == getItemCount()) {// 偶现相等
Log.e("mSelectPosition", "偶现相等 ");
mSelectPosition = 0;
}
if (mSelectedListener != null && mSelectPosition != mLastSelectPosition) {
mSelectedListener.onItemSelected(mSelectPosition);
}
mLastSelectPosition = mSelectPosition;
}