#zoomheaderview
????
???????????????????????????????????????????
??????????????????????????????????????????
???????????????? ???????????????????????????????????????? ???????????????
????Activity?????
????????????????????? ???????????????????????????????
??????imageview?viewpager??Viewpager????????View??????Activity?????????
????
???CoordinatorLayout+Behavior????????Behavior??????
viewpager+??
????????????????????????
- ??View
- viewpager
- RecyclerView
????View?Viewpager ?????????Header????Header?????????????RecyclerView????????????????
????????????????HeaderView?
?onTouchEvent????????
@Override public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
return true;
case MotionEvent.ACTION_MOVE:
if(???????){
?????()
}
else if(??????????viewpager){
}
else if(??????Activity)?header???????
- ???????????
- ???????viewpager?
- ?????finish Activity?
???????????????????????
???????????????????????????LayoutParams??????????????????
????LayoutParams??????????????requestLayout?????UI???
??????????????????????????ImageView??????Scale??????????????View?????????
????????? ????????? ??????????????????????????????????????????????????????View??????????View?????????(??????)????????????????
??????????????????????? ?????????????????????TranslationX???????????????scale????????????????????????????????
bottom.offsetLeftAndRight(
(int) (target.getWidth() / 2 - target.getWidth() * (1 + progress) / 2
+ MarginConfig.MARGIN_LEFT_RIGHT - bottom.getX()));
?????????????????????????padding????????????????????View???(????????)?????????????????????????????????????
ViewPager
??????????????
setPageTransformer(true, new ZoomOutPageTransformer());
???????????view??????????view??????????
/????????
@Override protected int getChildDrawingOrder(int childCount, int i) {
int position = getCurrentItem();
if(position<0){
return i;
}
else{
if(i == childCount - 1){
//???????????item
if(position>i){
position=i;
}
return position;
}
if(i == position){
//?????????????item
return childCount - 1;
}
}
return i;
}
}
RecyclerView
RecyclerView??????????????HeaderView???????????????????? ????RecyclerView????RecyclerView???????????Header??????????
@Override
public boolean onNestedFling(CoordinatorLayout coordinatorLayout, View child, View target,
float velocityX, float velocityY, boolean consumed) {
//??Fling?????
if (velocityY < 0 && ((RecyclerView) target).getChildAt(0).getY() == 0) {
mDependency.restore(mDependency.getY());
}
return super.onNestedFling(coordinatorLayout, child, target, velocityX, velocityY, consumed);
}
@Override
public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, View target,
int dx, int dy, int[] consumed) {
//?????
if (((RecyclerView) target).getChildAt(0).getY() == 0) {
//????
if (dy < 0) {
mDependency.setY(mDependency.getY() - dy);
//????
if (mDependency.getY() < 500) {
mDependency.restore(mDependency.getY());
}
}
}
super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed);
}
}
Behavior
?header?RecyclerView???????Behavior??Behavior???????????????????
denpendcy?HeaderView?????RecyclerView????
???????????~
???????????Star
??????qq?: 425983695
License
Copyright 2016 androidwing1992 Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.