title: why Error:(2) No resource identifier found for attribute 'shortcutShortLabel' in package 'android' when creating shourtcut in Android7?
body: <p>When I create a shortcut refer to the developer.android.com,
  the code I wrote is below</p>
  
  <pre><code>&lt;shortcuts xmlns:android="http://schemas.android.com/apk/res/android"&gt;
  &lt;shortcut
      android:enabled="true"
      android:icon="@drawable/share"
      android:shortcutId="search"
      android:shortcutShortLabel="@string/recommend_us"
      android:shortcutLongLabel="@string/recommend_to_friend"
      android:shortcutDisabledMessage="@string/bind_unbound"&gt;
      &lt;intent
          android:action="android.intent.action.VIEW"
          android:targetPackage="com.example.myapplication"
          android:targetClass="com.yidian.news.ui.search.SearchChannelActivity" /&gt;
  &lt;/shortcut&gt;
  &lt;!-- Specify more shortcuts here. --&gt;
  </code></pre>
  
  <p></p>
  
  <p>A simple one. But when I build the project, here comes out error message says</p>
  
  <p>Error:(2) No resource identifier found for attribute 'shortcutId' in package 'android'</p>
  
  <p>Error:(2) No resource identifier found for attribute 'shortcutShortLabel' in package 'android'</p>
  
  <p>Error:(2) No resource identifier found for attribute 'shortcutLongLabel' in package 'android'
  Error:(2) No resource identifier found for attribute 'shortcutDisabledMessage' in package 'android'</p>
  
  <p>why is that</p>
  
  <p>have upgrade all Android SDK &amp; tools</p>