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这个效果其实是和SegmentFault的首页效果是一样的。
Demo github地址戳这里
来由">
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这个效果其实是和SegmentFault的首页效果是一样的。
Demo github地址戳这里
来由">
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这个效果其实是和SegmentFault的首页效果是一样的。
Demo github地址戳这里
来由">
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Behavior实现滑动隐藏ToolBar与BottomNavigation
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<a class="tag-link" href="/tags/Android/">Android</a>, <a class="tag-link" href="/tags/Behavior/">Behavior</a>, <a class="tag-link" href="/tags/Material-Design/">Material Design</a>
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<h4 id="多说无益，先上效果图img-material-design"><a href="#多说无益，先上效果图img-material-design" class="headerlink" title="多说无益，先上效果图img\material-design"></a>多说无益，先上效果图img\material-design</h4><p><img src="/img/material-design/sticky_navigation.gif" width="360" height="640" alt="图片名称" align="center"></p>
<p>这个效果其实是和<code>SegmentFault</code>的首页效果是一样的。</p>
<p><a href="https://github.com/huyongli/StickyNavigation" target="_blank" rel="external">Demo github地址戳这里</a></p>
<h3 id="来由"><a href="#来由" class="headerlink" title="来由"></a>来由</h3><a id="more"></a>
<p>前几天有人问我这样的效果如何实现，有何思路，我的第一反应就是使用<code>Behavior</code>来实现这个效果，使用<code>Behavior</code>实现此效果比自定义View实现此效果绝对要简单很多，之后找时间了实现了这个效果。</p>
<h3 id="思路"><a href="#思路" class="headerlink" title="思路"></a>思路</h3><p>用过<code>ToolBar + CoordinatorLayout + AppBarLayout</code>的人应该知道这三者组合使用再设置合适的参数(没用过的人赶紧去看看吧，或者看我的Demo也可以哟)，就可以实现滑动隐藏显示<code>ToolBar</code>，因此这部分的效果<code>Android</code>使用<code>Behavior</code>已经替我们实现好了，没必要再去费神了，而且它的效果也蛮不错。</p>
<p>接下来我们要考虑的就是如何实现在滑动的时候也隐藏底部的<code>BottomNavigation</code>，既然前面我已经说过用<code>Behavior</code>来实现此效果，因此我们需要自定义一个<code>Behavior</code>来实现滑动隐藏<code>BottomNavigation</code>。</p>
<h3 id="撸代码"><a href="#撸代码" class="headerlink" title="撸代码"></a>撸代码</h3><p>在前面一篇文章<a href="http://ittiger.cn/Custom-Behavior-to-fast-back.html">自定义Behavior实现快速返回效果</a>(没看过的请先看看)中我已经介绍了自定义<code>Behavior</code>的相关知识，这里就不再赘述了。</p>
<p>先来看看<code>ToolBar</code>滑动隐藏的代码<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div></pre></td><td class="code"><pre><div class="line"><?xml version="1.0" encoding="utf-8"?></div><div class="line"><span class="tag"><<span class="name">android.support.design.widget.CoordinatorLayout</span></span></div><div class="line"> <span class="attr">xmlns:android</span>=<span class="string">"http://schemas.android.com/apk/res/android"</span></div><div class="line"> <span class="attr">xmlns:app</span>=<span class="string">"http://schemas.android.com/apk/res-auto"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"match_parent"</span>></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">android.support.design.widget.AppBarLayout</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/appBarLayout"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"wrap_content"</span></div><div class="line"> <span class="attr">android:theme</span>=<span class="string">"@style/ThemeOverlay.AppCompat.Dark.ActionBar"</span>></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">android.support.v7.widget.Toolbar</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/toolBar"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"?attr/actionBarSize"</span></div><div class="line"> <span class="attr">android:background</span>=<span class="string">"@android:color/holo_blue_dark"</span></div><div class="line"> <span class="attr">app:title</span>=<span class="string">"ToolBar Title"</span></div><div class="line"> <span class="attr">app:titleTextColor</span>=<span class="string">"@android:color/white"</span></div><div class="line"> <span class="attr">app:layout_scrollFlags</span>=<span class="string">"scroll|enterAlways"</span>/></div><div class="line"> </div><div class="line"> <span class="tag"></<span class="name">android.support.design.widget.AppBarLayout</span>></span></div><div class="line"></div><div class="line"><span class="tag"></<span class="name">android.support.design.widget.CoordinatorLayout</span>></span></div></pre></td></tr></table></figure></p>
<p>上面属性设置中<code>app:layout_scrollFlags="scroll|enterAlways"</code>这个是必须要有，否则话滑动的时候<code>ToolBar</code>是不会滑动的。</p>
<p>那滑动隐藏<code>BottomNavigation</code>的这个<code>Behavior</code>该如何实现呢？其实很简单，我们在滑动列表的时候可以看到当<code>ToolBar</code>往上滑的时候<code>BottomNavigation</code>会同时往下滑，因此这里我可以把<code>ToolBar</code>作为<code>BottomNavigation</code>的依赖，<code>ToolBar</code>往上滑动多少<code>BottomNavigation</code>就同时往下滑动多少(这里我实现时保证了两者高度一致)。</p>
<p>既然知道了依赖关系也知道了滑动方向和滑动距离，再实现<code>Behavior</code>就简单多了，代码如下：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">BottomNavigationViewBehavior</span> <span class="keyword">extends</span> <span class="title">CoordinatorLayout</span>.<span class="title">Behavior</span><<span class="title">View</span>> </span>{</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="title">BottomNavigationViewBehavior</span><span class="params">()</span> </span>{</div><div class="line"></div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="title">BottomNavigationViewBehavior</span><span class="params">(Context context, AttributeSet attrs)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">super</span>(context, attrs);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onLayoutChild</span><span class="params">(CoordinatorLayout parent, View child, <span class="keyword">int</span> layoutDirection)</span> </span>{</div><div class="line"></div><div class="line"> ((CoordinatorLayout.LayoutParams) child.getLayoutParams()).topMargin = parent.getMeasuredHeight() - child.getMeasuredHeight();</div><div class="line"> <span class="keyword">return</span> <span class="keyword">super</span>.onLayoutChild(parent, child, layoutDirection);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">layoutDependsOn</span><span class="params">(CoordinatorLayout parent, View child, View dependency)</span> </span>{</div><div class="line"></div><div class="line"> <span class="comment">//因为Behavior只对CoordinatorLayout的直接子View生效，因此将依赖关系转移到AppBarLayout</span></div><div class="line"> <span class="keyword">return</span> dependency <span class="keyword">instanceof</span> AppBarLayout;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onDependentViewChanged</span><span class="params">(CoordinatorLayout parent, View child, View dependency)</span> </span>{</div><div class="line"></div><div class="line"> <span class="comment">//得到依赖View的滑动距离</span></div><div class="line"> <span class="keyword">int</span> top = ((AppBarLayout.Behavior)((CoordinatorLayout.LayoutParams)dependency.getLayoutParams()).getBehavior()).getTopAndBottomOffset();</div><div class="line"> <span class="comment">//因为BottomNavigation的滑动与ToolBar是反向的，所以取-top值</span></div><div class="line"> ViewCompat.setTranslationY(child, -top);</div><div class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>上面的代码中获取依赖视图<code>AppBarLayout</code>的滑动距离时需要注意几点：</p>
<ol>
<li>通过<code>AppBarLayout.getTranslationY()</code>无法获取到正确的滑动距离</li>
<li>通过<code>AppBarLayout.getTop()</code>无法获取到正确的滑动距离</li>
<li>最后查看源码后发现通过<code>AppBarLayout.Behavior.getTopAndBottomOffset()</code>可以获得正确的滑动距离值</li>
</ol>
<p>现在<code>Behavior</code>实现了，我们再来看完整的布局文件<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div></pre></td><td class="code"><pre><div class="line"><?xml version="1.0" encoding="utf-8"?></div><div class="line"><span class="tag"><<span class="name">android.support.design.widget.CoordinatorLayout</span></span></div><div class="line"> <span class="attr">xmlns:android</span>=<span class="string">"http://schemas.android.com/apk/res/android"</span></div><div class="line"> <span class="attr">xmlns:app</span>=<span class="string">"http://schemas.android.com/apk/res-auto"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"match_parent"</span>></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">android.support.design.widget.AppBarLayout</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/appBarLayout"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"wrap_content"</span></div><div class="line"> <span class="attr">android:theme</span>=<span class="string">"@style/ThemeOverlay.AppCompat.Dark.ActionBar"</span>></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">android.support.v7.widget.Toolbar</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/toolBar"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"?attr/actionBarSize"</span></div><div class="line"> <span class="attr">android:background</span>=<span class="string">"@android:color/holo_blue_dark"</span></div><div class="line"> <span class="attr">app:title</span>=<span class="string">"ToolBar Title"</span></div><div class="line"> <span class="attr">app:titleTextColor</span>=<span class="string">"@android:color/white"</span></div><div class="line"> <span class="attr">app:layout_scrollFlags</span>=<span class="string">"scroll|enterAlways"</span>/></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">android.support.design.widget.TabLayout</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/tabLayout"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"wrap_content"</span></div><div class="line"> <span class="attr">android:background</span>=<span class="string">"@android:color/holo_blue_light"</span></div><div class="line"> <span class="attr">app:tabTextColor</span>=<span class="string">"@android:color/white"</span></div><div class="line"> <span class="attr">app:tabGravity</span>=<span class="string">"center"</span></div><div class="line"> <span class="attr">app:tabIndicatorColor</span>=<span class="string">"@android:color/white"</span></div><div class="line"> <span class="attr">app:tabSelectedTextColor</span>=<span class="string">"@android:color/holo_red_dark"</span>/></div><div class="line"> <span class="tag"></<span class="name">android.support.design.widget.AppBarLayout</span>></span></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">android.support.v4.view.ViewPager</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/viewpager"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:background</span>=<span class="string">"@android:color/white"</span></div><div class="line"> <span class="attr">app:layout_behavior</span>=<span class="string">"@string/appbar_scrolling_view_behavior"</span>/></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">android.support.design.widget.BottomNavigationView</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/bottomNavigationView"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"?attr/actionBarSize"</span></div><div class="line"> <span class="attr">android:background</span>=<span class="string">"@android:color/holo_blue_dark"</span></div><div class="line"> <span class="attr">android:layout_gravity</span>=<span class="string">"bottom"</span></div><div class="line"> <span class="attr">app:menu</span>=<span class="string">"@menu/bottom_menus"</span></div><div class="line"> <span class="attr">app:layout_behavior</span>=<span class="string">"cn.ittiger.stickynavigation.behavior.BottomNavigationViewBehavior"</span></div><div class="line"> /></div><div class="line"><span class="tag"></<span class="name">android.support.design.widget.CoordinatorLayout</span>></span></div></pre></td></tr></table></figure></p>
<p>对于布局中的<code>ToolBar</code>和<code>BottomNavigationView</code>也可以换成其他任意<code>View</code>来实现滑动隐藏效果。</p>
<p>Demo的完整代码在这 <a href="https://github.com/huyongli/StickyNavigation" target="_blank" rel="external">github地址</a></p>
<hr>
<p>原创文章，本文采用<a href="https://creativecommons.org/licenses/by/2.5/cn/" target="_blank" rel="external">知识共享署名 2.5(中国大陆许可协议)</a>进行许可，欢迎转载，但转载请注明来自<a href="ittiger.cn">ittiger.cn</a>，并保证转载后文章内容的完整性。本人(laohu)保留所有版权相关权利。</p>
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