关于FAB、CardView、Snackbar、TextInputLayout...

rept6259 8年前
   <h2><strong>1、FloatingActionButton</strong></h2>    <p>FAB用来表示一个APP最主要的操作( promoted action),它主要有以下几个属性:</p>    <ul>     <li>属性:      <ul>       <li>elevation:正常显示时阴影的大小(FAB在Z轴方向的高度)</li>       <li>pressedTranslationZ:按下时阴影的大小(按下时,在Z轴的偏移量)</li>       <li>layout_anchor:锚点</li>       <li>layout_anchorGrav:相对于锚点的位置</li>       <li>backgroundTint:背景色,默认的是theme中的colorAccent</li>       <li>rippleColor:按下时的颜色,默认的是theme中的colorControlHighlight</li>       <li>fabSize:FAB的大小,normal、mini</li>      </ul> </li>    </ul>    <p>代码实现</p>    <pre>  <code class="language-java"><android.support.design.widget.FloatingActionButton          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:src="@drawable/ic_tick"          app:elevation="8dp"          app:fabSize="normal"          app:borderWidth="0dp"          app:pressedTranslationZ="10dp"          app:backgroundTint="#c96449"          app:rippleColor="#dfe7ab"          app:layout_anchor="@id/collapsingToolbarLayout"          app:layout_anchorGravity="bottom|right"          app:useCompatPadding="true"/></code></pre>    <p style="text-align:center"><img src="https://simg.open-open.com/show/3d5339c34aa07c77e575371e10286ade.gif"></p>    <p style="text-align:center">FloatingActionButton</p>    <p>注意:</p>    <p>为FAB添加点击事件,才有ripple的效果</p>    <ul>     <li>样式      <ul>       <li>在屏幕上只能有一个FAB</li>       <li>图标:默认,56X56dp;最小40X40dp,用来和屏幕中的其他元素创造视觉的连续性</li>       <li>icon: 24 x 24dp</li>      </ul> </li>    </ul>    <p style="text-align:center"><img src="https://simg.open-open.com/show/9812945f918028e06997c59bf536ca4f.png"></p>    <p style="text-align:center">Floating action button</p>    <p>参考:</p>    <p><a href="/misc/goto?guid=4959714475927512950" rel="nofollow,noindex">Android Reference FloatingActionButton</a></p>    <p><a href="/misc/goto?guid=4959714476036294364" rel="nofollow,noindex">Android 设计文档,FAB</a></p>    <h2><strong>2、Snackbar</strong></h2>    <p>Snackbar提供了一个可以回调的消息;可以滑出;一个只能同时显示一个Snackbar;高度:48dp (single-line), 80dp (multi-line)</p>    <p>使用的时候,最好将Snackbar与一个CoordinatorLayout关联,这样的话:</p>    <ul>     <li>可以手动滑出</li>     <li>在Snackbar出现的时候,一些ui元素会被移动</li>    </ul>    <p style="text-align:center"><img src="https://simg.open-open.com/show/797724349fd7f8c73bcea9e9042a3672.gif"></p>    <p style="text-align:center">在Snackbar出现的时候,一些ui元素会被移动</p>    <pre>  <code class="language-java">Snackbar.make(coordinatorLayout, "floatingActionButton ", Snackbar.LENGTH_LONG).setAction("ok", null).show();</code></pre>    <p><a href="/misc/goto?guid=4959714476129442453" rel="nofollow,noindex">Android training Snackbar</a></p>    <p><a href="/misc/goto?guid=4959714476224828458" rel="nofollow,noindex">Android Reference Snackbar</a></p>    <p><a href="/misc/goto?guid=4959714476319448066" rel="nofollow,noindex">Android Snackbar 设计文档</a></p>    <h2><strong>3、CardView</strong></h2>    <p>卡片非常适合展示有不同元素组成的内容,比如带有长标题的图片</p>    <ul>     <li>特点:      <ul>       <li>有圆角</li>       <li>有多个Action</li>       <li>可以被重新排列、取消</li>      </ul> </li>    </ul>    <p style="text-align:center"><img src="https://simg.open-open.com/show/ef0c5a0f50f0a2dac65011fced1e27aa.png"></p>    <p style="text-align:center">Card的粒子</p>    <ul>     <li>属性      <ul>       <li>cardElevation:cardView的高度(投影)</li>       <li>cardCornerRadius:圆角半径,2dp</li>       <li>contentPadding:内边距</li>       <li>cardUseCompatPadding:Add padding in API v21+ as well to have the same measurements with previous versions,不明白</li>       <li>cardPreventCornerOverlap:为API 20及以前的版本添加padding,防止CardView的内容(ImageView)和CardView的圆角 交叉,效果如下</li>      </ul> </li>    </ul>    <p style="text-align:center"><img src="https://simg.open-open.com/show/08df987e4c3ced9416a21ad53a52c710.jpg"></p>    <p style="text-align:center">API 19,cardPreventCornerOverlap为true</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/b3f67c558ae22bf5d8759d41f8c02ef1.jpg"></p>    <p style="text-align:center">API 19,cardPreventCornerOverlap为false</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/c3cf02cbb011a4ca480c81ad9977b6b4.png"></p>    <p style="text-align:center">API 23</p>    <p>以上contentPadding="0dp"</p>    <p>代码如下</p>    <pre>  <code class="language-java"><android.support.v7.widget.CardView                  android:layout_width="match_parent"                  android:layout_height="wrap_content"                  app:contentPadding="4dp"                  app:cardElevation="2dp"                  app:cardUseCompatPadding="true"                  app:cardCornerRadius="2dp"                  app:cardPreventCornerOverlap="true"                  android:stateListAnimator="@drawable/state_list_animator_selector">                  ...              </android.support.v7.widget.CardView></code></pre>    <p style="text-align:center"><img src="https://simg.open-open.com/show/31f9b8b58b5c5ad79422144c5bdd03f6.gif"></p>    <p style="text-align:center">API 21 以上有效,点击cardView</p>    <p>如果要实现如图点击的效果,添加 <strong>stateListAnimator</strong> 属性,它在API 21以上有效</p>    <p>state_list_animator_selector,代码如下</p>    <pre>  <code class="language-java"><?xml version="1.0" encoding="utf-8"?>  <selector xmlns:android="http://schemas.android.com/apk/res/android">        <item android:state_pressed="true">          <set>              <objectAnimator                  android:duration="@android:integer/config_shortAnimTime"                  android:propertyName="translationZ"                  android:valueTo="16dp"                  android:valueType="floatType" />          </set>      </item>        <item android:state_pressed="false">          <set>              <objectAnimator                  android:duration="@android:integer/config_shortAnimTime"                  android:propertyName="translationZ"                  android:valueTo="0dp"                  android:valueType="floatType" />          </set>      </item>    </selector></code></pre>    <p>注意:为cardView添加点击事件,才有上面这个动画效果</p>    <p>参考:</p>    <p><a href="/misc/goto?guid=4959714476407958898" rel="nofollow,noindex">Android 设计文档,Card</a></p>    <p><a href="/misc/goto?guid=4959714476505186261" rel="nofollow,noindex">Android Reference cardview</a></p>    <h2><strong>4、TextInputLayout</strong></h2>    <p>提供一个显示在EditText上方的浮动标签,效果如下</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/545e875ac8dac2a08c5fa9d38aaabb4a.gif"></p>    <p style="text-align:center">TextInputLayout ,EditText 校验</p>    <p>代码如下</p>    <pre>  <code class="language-java"><android.support.design.widget.TextInputLayout          android:layout_margin="30dp"          android:id="@+id/passwordTextInputLayout"          android:layout_width="match_parent"          android:layout_height="wrap_content"          app:counterEnabled="true"          app:counterMaxLength="10"          app:counterTextAppearance="@style/MyTextColor"          app:counterOverflowTextAppearance="@android:color/holo_red_dark">            <EditText              android:layout_width="match_parent"              android:layout_height="wrap_content"              android:hint="password"              android:inputType="number"/>        </android.support.design.widget.TextInputLayout></code></pre>    <pre>  <code class="language-java"><style name="MyTextColor" parent="AppTheme">          <item name="android:textColor">@android:color/holo_red_dark</item>          <item name="android:textColorHint">@color/colorPrimary</item>      </style></code></pre>    <pre>  <code class="language-java">passwordTextInputLayout.getEditText().addTextChangedListener(new TextWatcher() {              @Override              public void beforeTextChanged(CharSequence s, int start, int count, int after) {                }                @Override              public void onTextChanged(CharSequence s, int start, int before, int count) {                }                @Override              public void afterTextChanged(Editable s) {                    if(passwordTextInputLayout.getEditText().getText().toString().length()<6){                      passwordTextInputLayout.setErrorEnabled(true);                      passwordTextInputLayout.setError("密码长度小于6位");                  }else {                      passwordTextInputLayout.setErrorEnabled(false);                  }              }          });</code></pre>    <p>注意:TextInputLayout只能包含一个子View</p>    <ul>     <li> <p>TextInputLayout会在左下角生成一个TextView用来显示错误信息这个效果是怎么实现的呢?</p> <p>需要借助 <strong>setErrorEnabled()</strong> 方法,如果传入true,TextInputLayout会在左下角生成一个TextView用来显示错误信息,之后调用setError() 方法,设置错误信息;如果传入false,则移除TextView从而不显示错误信息。</p> </li>     <li> <p>如何统计输入的字数?</p> <p>使用 app:counterEnabled="true",app:counterMaxLength="10"</p> </li>    </ul>    <p style="text-align:center"><img src="https://simg.open-open.com/show/130f03ebabe0b4ae6ada7adfe869d967.gif"></p>    <p style="text-align:center">统计输入的字数</p>    <p> </p>    <p> </p>    <p>来自:http://www.jianshu.com/p/8e9a11783fde</p>    <p> </p>