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在新的Android Support Library里面,新增了CoordinatorLayout, AppBarLayout等.
实现的效果: 向下滚动RecylerView,Tab会被隐藏,向上滚动RecylerView,Tab恢复出现.这么做的好处在于,用户能有更多的空间位置去看列表里面的内容.
<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <android.support.design.widget.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <android.support.v7.widget.Toolbar android:id="@+id/third_activity_toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" /> <android.support.design.widget.TabLayout android:id="@+id/tab_layout" android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_scrollFlags="scroll|enterAlways" app:tabIndicatorColor="@color/medium_blue" app:tabSelectedTextColor="@color/medium_blue" app:tabTextAppearance="@style/TabText" app:tabTextColor="@color/gray_text" /> </android.support.design.widget.AppBarLayout> <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_behavior="@string/appbar_scrolling_view_behavior" /> </android.support.design.widget.CoordinatorLayout>
1) 首先需要用CoordinatorLayout包住AppBarLayout;
2) 顶部区域的View都放在AppBarLayout里面;
3) AppBarLayout外面,CoordinatorLayout里面,放一个带有可滚动的View.如上的例子,放的是ViewPager,而ViewPager里面是放了RecylerView的,即是可以滚动的View.
4) 在AppBarLayout里面的View,通过app:layout_scrollFlags属性来控制,滚动时候的表现.其中有4种Flag的类型.
scroll: this flag should be set for all views that want to scroll off the screen - for views that do not use this flag, they’ll remain pinned to the top of the screenenterAlways: this flag ensures that any downward scroll will cause this view to become visible, enabling the ‘quick return’ patternenterAlwaysCollapsed: When your view has declared a minHeight and you use this flag, your View will only enter at its minimum height (i.e., ‘collapsed’), only re-expanding to its full height when the scrolling view has reached it’s top.exitUntilCollapsed: this flag causes the view to scroll off until it is ‘collapsed’ (its minHeight) before exiting上面的例子种用的是 scroll 和 enterAlways.
Scroll 表示向下滚动时,这个View会被滚出屏幕范围直到隐藏.
enterAlways 表示向上滚动时,这个View会随着滚动手势出现,直到恢复原来的位置.
5) 在可以滚动的View上设置属性 app:layout_behavior.
该属性的值实际上是一个完整的class名字,而上面例子中的 @string/appbar_scrolling_view_behavior 是Android Support Library 定义后的值,可以被直接使用.
这个Behavior的class是真正控制滚动时候View的滚动行为.我们也可以继承Behavior这个class去实现特有的滚动行为.
6) 代码部分,只需要实现RecylerView的逻辑就可以了.
Android CoordinatorLayout + AppBarLayout(向上滚动隐藏指定的View)
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原文地址：http://www.cnblogs.com/zhujiabin/p/5674914.html
