title: What is the different between android:maxSdkVersion="18" and no?
body: <p>What is the different between</p>
  
  <pre><code>&lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="18"/&gt;
  &lt;uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="18"/&gt;
  </code></pre>
  
  <p>and</p>
  
  <pre><code>&lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE&gt;
  &lt;uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"&gt;
  </code></pre>