由CustomCoordinatorLayout控制两个子view（CustomCollaspingToolbarLayout + other）的touchEvent，由CustomCollaspingToolbarLayout控制它的子view随顶部offset变化而变化。
#引用
compile 'com.gaiso.flex_view:flex-view:1.0.0'
#用法
###CustomCoordinatorLayout
coordinatorLayout.addOnOffsetChangedListener(this);//顶部offset变化回调 CustomCoordinatorLayout.OnOffsetChangedListener
//coordinatorLayout.setHorizontalMoveChildView(CustomCoordinatorLayout.CONTENT_VIEW_CAN_MOVE_HORIZONTALLY); 当子view存在viewpager
//需要横向滑动时设置。HEADER_VIEW_CAN_MOVE_HORIZONTALLY，CONTENT_VIEW_CAN_MOVE_HORIZONTALLY，默认NONE_CAN_MOVE_HORIZONTALLY
coordinatorLayout.setScrollHandler(new IScrollHandler() {//获取第二个子view的状态及对它的操作
@Override
public boolean isTop() {
return linearLayoutManager.findFirstCompletelyVisibleItemPosition() == 0;
}
@Override
public boolean isBottom() {
return false;
}
@Override
public void scrollBy(int distance) {
recyclerView.scrollBy(0, distance);
}
@Override
public void translate(int left, int top, int right, int bottom) {
recyclerView.measure(View.MeasureSpec.makeMeasureSpec(right, View.MeasureSpec.EXACTLY), View.MeasureSpec
.makeMeasureSpec(bottom - top, View.MeasureSpec.EXACTLY));
recyclerView.layout(left, top, right, bottom);
}
});###CustomCollapsingToolbarLayout
<com.gaiso.flex_view.CustomCollapsingToolbarLayout
android:id="@+id/layout_collapse"
android:layout_width="match_parent"
android:layout_height="200dp"
app:collapseHeight="49dp"
app:layoutScrim="@color/colorPrimary">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="@mipmap/car"/>
<com.flex.jie.flexdemo.widget.HorizontalFlexSearchView
android:id="@+id/horizontal_search_view"
android:layout_width="match_parent"
android:layout_height="35dp"
android:layout_alignParentBottom="true"
android:layout_marginBottom="15dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
app:background_color_after="@color/bg_orange"
app:background_color_before="@color/white"
app:collapseMode="parallax"
app:corner_radiu="3dp"
app:drawScrim="always"
app:parallax_range="10dp"
app:right_offset="30dp"
app:search_icon_after="@mipmap/icon_search"
app:search_icon_before="@mipmap/icon_gray_search"
app:search_text="大家都在搜：汽车"
app:text_color_after="@color/text_orange"
app:text_color_before="@color/text_gray"
app:text_size="15sp"/>
</com.gaiso.flex_view.CustomCollapsingToolbarLayout>app:collapseHeight 设置收缩状态的高度
app:layoutScrim 设置颜色
#####对子view的设置 app:collapseMode none(默认）,pin(offset变化时该子view位置固定),parallax(与parallax_range一起设置) app:drawScrim="always" 设置scrim覆盖哪些子view（按照子view draw的顺序，一般看xml的顺序， 例如子view3设置了always,scrim将覆盖子view1和2） app:parallax_range="10dp" 随着收缩百分比变化的范围
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