recyclerview 滚动监听
RecyclerView的滚动事件OnScrollListener研究
http://www.open-open.com/lib/view/open1477623086381.html
滚动参数
http://www.tuicool.com/articles/7RzUjaR
http://www.open-open.com/lib/view/open1477623086381.html
//此方法只是关闭软键盘
private void hintKbTwo() {
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
if(imm.isActive()&&getCurrentFocus()!=null){
if (getCurrentFocus().getWindowToken()!=null) {
imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}
}
}
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == SCROLL_STATE_DRAGGING) {
hintKbTwo();
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int juli = getScollYDistance();
int firstVisibleItem = mManager.findFirstVisibleItemPosition();
int section = getSectionForPosition(firstVisibleItem);
int nextSection = getSectionForPosition(firstVisibleItem + 1);
int nextSecPosition = getPositionForSection(+nextSection);
if (firstVisibleItem != lastFirstVisibleItem) {
ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) titleLayout.getLayoutParams();
params.topMargin = 0;
titleLayout.setLayoutParams(params);
title.setText(mData.get(getPositionForSection(section)).getSortLetters());
}
if (nextSecPosition == firstVisibleItem + 1) {
View childView = recyclerView.getChildAt(0);
if (nextSecPosition == firstVisibleItem + 1) {
int titleHeight = titleLayout.getHeight();
int bottom = childView.getBottom();
ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) titleLayout.getLayoutParams();
if (bottom < titleHeight) {
float pushedDistance = bottom - titleHeight;
params.topMargin = (int) pushedDistance;
titleLayout.setLayoutParams(params);
} else {
if (params.topMargin != 0) {
params.topMargin = 0;
titleLayout.setLayoutParams(params);
}
}
}
}
lastFirstVisibleItem = firstVisibleItem;
}
});