CoordinatorLayout+AppBarLayout实现上滑隐藏ToolBar-Android M新控件

效果图

CoordinatorLayout+AppBarLayout实现上滑隐藏ToolBar-Android M新控件_第1张图片

CoordinatorLayout

概述

CoordinatorLayout官方API

CoordinatorLayout+AppBarLayout实现上滑隐藏ToolBar-Android M新控件_第2张图片 
从官方文档中我们可以看到: 
CoordinatorLayout是一个增强型的FrameLayout。 
两个作用: 
- As a top-level application decor or chrome layout 
- As a container for a specific interaction with one or more child views


- 作为一个布局的根布局 
- 作为一个为子视图之间相互协调手势效果的一个协调布局 
- )

该控件也是Design包下的一个控件,然而这个控件可以被称为Design包中最复杂、功能最强大的控件:CoordinatorLayout。为什么这样说呢?原因是:它是组织它众多子view之间互相协作的一个ViewGroup。

CoordinatorLayout 的神奇之处就在于 Behavior 对象。怎么理解呢?CoordinatorLayout使得子view之间知道了彼此的存在,一个子view的变化可以通知到另一个子view,CoordinatorLayout 所做的事情就是当成一个通信的桥梁,连接不同的view,使用 Behavior 对象进行通信。

比如:在CoordinatorLayout中使用AppBarLayout,如果AppBarLayout的子View(如ToolBarTabLayout)标记了app:layout_scrollFlags滚动事件,那么在CoordinatorLayout布局里其它标记了app:layout_behavior的子View(LinearLayout、RecyclerView、NestedScrollView等)就能够响应(如ToolBar、TabLayout)控件被标记的滚动事件。

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.support</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.design</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.widget</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.CoordinatorLayout</span>
    xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span>
    xmlns:app=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span>
    xmlns:toolbar=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span>
    android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/coordinator_layout"</span>
    android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>
    android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>>

    <android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.support</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.design</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.widget</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.AppBarLayout</span>
        android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>
        android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"wrap_content"</span>
        android:fitsSystemWindows=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span>>

        <android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.support</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.v</span>7<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.widget</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Toolbar</span>
            android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/toolBar"</span>
            android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>
            android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"?attr/actionBarSize"</span>
            android:background=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"#30469b"</span>
            app:layout_scrollFlags=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"scroll|enterAlways"</span>

            toolbar:logo=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@drawable/gur_project_10"</span>
            toolbar:navigationIcon=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@drawable/ic_drawer_home"</span>
            toolbar:subtitle=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"子标题"</span>
            toolbar:title=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"标题"</span>/>

        <android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.support</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.design</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.widget</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.TabLayout</span>
            android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/tabLayout"</span>
            android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>
            android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"wrap_content"</span>
            android:background=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"#30469b"</span>
            app:tabGravity=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fill"</span>
            app:tabMode=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fixed"</span>
            app:tabSelectedTextColor=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"#ff0000"</span>
            app:tabTextColor=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"#ffffff"</span>
            />
    </android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.support</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.design</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.widget</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.AppBarLayout</span>>

    <LinearLayout
        android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>
        android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>
        android:orientation=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"vertical"</span>
        android:scrollbars=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"none"</span>
        app:layout_behavior=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@string/appbar_scrolling_view_behavior"</span>>

        <android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.support</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.v</span>4<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ViewPager</span>
            android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/viewpager"</span>
            android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>
            android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> />
    </LinearLayout>

</android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.support</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.design</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.widget</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.CoordinatorLayout</span>>
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li></ul>

上述布局文件中,ToolBar标记了layout_scrollFlags滚动事件,那么当LinearLayout滚动时便可触发ToolBar中的layout_scrollFlags效果

即往上滑动隐藏ToolBar,下滑出现ToolBar,而不会隐藏TabLayout,因为TabLayout没有标记scrollFlags事件,相反,如果TabLayout也标记了ScrollFlags事件,那么LinearLayout的下滑时ToolBar和TabLayout都会隐藏了。

layout_scrollFlags说明

value comment
scroll 所有想滚动出屏幕的view都需要设置这个flag, 没有设置这个flag的view将被固定在屏幕顶部。
enterAlways 这个flag让任意向下的滚动都会导致该view变为可见,启用快速“返回模式”。
enterAlwaysCollapsed 当你的视图已经设置minHeight属性又使用此标志时,你的视图只能已最小高度进入,只有当滚动视图到达顶部时才扩大到完整高度
exitUntilCollapsed 滚动退出屏幕,最后折叠在顶端

【注意】: 设置了layout_scrollFlags标志的View必须在没有设置的View的之前定义,这样可以确保设置过的View都从上面移出, 只留下那些固定的View在下面。

TabLayout

TabLayout-Android M新控件

说到TabLayout,就是实现多个Tab之间的切换,不过Google在Design library新推出的TabLayout既实现了固定的选项卡 – (Tab的宽度平均分配),也实现了可滚动的选项卡 – (Tab宽度不固定,同时可以横向滚动),还实现了所有Tab居中显示。它还有一个重要作用就是结合ViewPager来实现多个Tab之间的切换。 
来看看TabLayout的三种实现方式:

  • 固定的Tab,根据TabLayout的宽度适配 
    CoordinatorLayout+AppBarLayout实现上滑隐藏ToolBar-Android M新控件_第3张图片
  • 固定的Tab,在TabLayout中居中显示 
    CoordinatorLayout+AppBarLayout实现上滑隐藏ToolBar-Android M新控件_第4张图片
  • 可滑动的Tab 
    CoordinatorLayout+AppBarLayout实现上滑隐藏ToolBar-Android M新控件_第5张图片

要实现上述效果,首先就需要加入TabLayout:

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.support</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.design</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.widget</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.TabLayout</span>
<span class="hljs-label" style="box-sizing: border-box;">android:</span>id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/tabLayout"</span>
<span class="hljs-label" style="box-sizing: border-box;">android:</span>layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>
<span class="hljs-label" style="box-sizing: border-box;">android:</span>layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"wrap_content"</span>
<span class="hljs-label" style="box-sizing: border-box;">android:</span>background=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"#30469b"</span>
<span class="hljs-label" style="box-sizing: border-box;">app:</span>tabGravity=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fill"</span>
<span class="hljs-label" style="box-sizing: border-box;">app:</span>tabMode=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fixed"</span>
<span class="hljs-label" style="box-sizing: border-box;">app:</span>tabSelectedTextColor=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"#ff0000"</span>
<span class="hljs-label" style="box-sizing: border-box;">app:</span>tabTextColor=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"#ffffff"</span> /></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

上面有几个参数我来详细介绍下吧,其实就是通过改变这几个参数来改变TabLayout显示效果的:

  • tabGravity —Tab的重心,有填充和居中两个值,为别为fill和center。
  • tabMode —Tab的模式,有固定和滚动两个模式,分别为 fixed 和 scrollable。
  • tabTextColor —设置默认状态下Tab上字体的颜色。
  • tabSelectedTextColor —设置选中状态下Tab上字体的颜色。

然后在代码中动态添加Tab:

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">TabLayout mTabLayout = (TabLayout) findViewById(R<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.id</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.tabLayout</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
mTabLayout<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.addTab</span>(mTabLayout<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.newTab</span>()<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setText</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"TabOne"</span>))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;//给TabLayout添加Tab</span>
mTabLayout<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.addTab</span>(mTabLayout<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.newTab</span>()<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setText</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"TabTwo"</span>))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
mTabLayout<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.addTab</span>(mTabLayout<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.newTab</span>()<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setText</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"TabThree"</span>))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
mTabLayout<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setupWithViewPager</span>(mViewPager)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;//给TabLayout设置关联ViewPager,如果设置了ViewPager,那么ViewPagerAdapter中的getPageTitle()方法返回的就是Tab上的标题</span>
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>

ViewPager设置代码:

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">ViewPager mViewPager = (ViewPager) findViewById(R<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.id</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.viewpager</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
MyViewPagerAdapter viewPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager())<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
viewPagerAdapter<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.addFragment</span>(FragmentOne<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.newInstance</span>(), <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"TabOne"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;//添加Fragment</span>
viewPagerAdapter<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.addFragment</span>(FragmentTwo<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.newInstance</span>(), <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"TabTwo"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
viewPagerAdapter<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.addFragment</span>(FragmentThree<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.newInstance</span>(), <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"TabThree"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
mViewPager<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setAdapter</span>(viewPagerAdapter)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;//设置适配器</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>

然后把mViewPager设置给TabLayout即可。贴一下ViewPager适配器代码:

<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> android.support.v4.app.Fragment;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> android.support.v4.app.FragmentManager;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> android.support.v4.app.FragmentPagerAdapter;

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.util.ArrayList;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.util.List;

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
 * 另外的写法 参考 :SimpleFragmentPagerAdapter
 */</span>

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MyViewPagerAdapter</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">FragmentPagerAdapter</span> {</span>
    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//添加的Fragment的集合</span>
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> List<Fragment> mFragments = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> ArrayList<>();
    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//每个Fragment对应的title的集合</span>
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> List<String> mFragmentsTitles = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> ArrayList<>();

    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-title" style="box-sizing: border-box;">MyViewPagerAdapter</span>(FragmentManager fm) {
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>(fm);
    }

    <span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
     *<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> fragment      添加Fragment
     *<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> fragmentTitle Fragment的标题,即TabLayout中对应Tab的标题
     */</span>
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">addFragment</span>(Fragment fragment, String fragmentTitle) {
        mFragments.add(fragment);
        mFragmentsTitles.add(fragmentTitle);
    }

    <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span>
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> Fragment <span class="hljs-title" style="box-sizing: border-box;">getItem</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> position) {
        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//得到对应position的Fragment</span>
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> mFragments.get(position);
    }

    <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span>
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> <span class="hljs-title" style="box-sizing: border-box;">getCount</span>() {
        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//返回Fragment的数量</span>
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> mFragments.size();
    }

    <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span>
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> CharSequence <span class="hljs-title" style="box-sizing: border-box;">getPageTitle</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> position) {
        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//得到对应position的Fragment的title</span>
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> mFragmentsTitles.get(position);
    }
}
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li></ul>

总结

为了使得Toolbar可以滑动,我们必须还得有个条件,就是CoordinatorLayout布局下包裹一个可以滑动的布局,比如 RecyclerView,NestedScrollView(经过测试,ListView,ScrollView不支持)具有滑动效果的组件。并且给这些组件设置如下属性来告诉CoordinatorLayout,该组件是带有滑动行为的组件,然后CoordinatorLayout在接受到滑动时会通知AppBarLayout 中可滑动的Toolbar可以滑出屏幕了。

为了使得Toolbar有滑动效果,必须做到如下三点:

  • CoordinatorLayout必须作为整个布局的父布局容器。
  • 给需要滑动的组件设置 app:layout_scrollFlags=”scroll|enterAlways” 属性。
  • 给你的可滑动的组件,也就是RecyclerView 或者 NestedScrollView 设置如下属性:
<code class="hljs perl has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> app:layout_behavior=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@string</span>/appbar_scrolling_view_behavior"</span></code>

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