title: What does @hide mean in the Android source code?
body: <p>For the <a href="https://android.googlesource.com/platform/frameworks/base/+/android-2.3.5_r1/core/java/android/app/Activity.java" rel="noreferrer"><code>Activity</code> source code</a>, line 3898 (close to the bottom):</p>
  
  <pre><code>/**
   * @hide
   */
  public final boolean isResumed() {
      return mResumed;
  }
  </code></pre>
  
  <p>What does <code>@hide</code> mean?</p>
  
  <p>I found my <code>public class ChildActivity extends Activity { ... }</code> cannot use/see <code>Activity.isResumed()</code>. Is this normal? How can I access it?</p>