title: How should I use android developer page correctly?
body: <p>I am completely new on developing Android OS and having difficulty using <a href="https://developer.android.com/" rel="nofollow noreferrer">https://developer.android.com/</a></p>
  <p>I want to adjust the advices written on the page but I think I do not understand how to at all .</p>
  <p>For example, I am now seeing <a href="https://developer.android.com/reference/android/animation/ObjectAnimator" rel="nofollow noreferrer">https://developer.android.com/reference/android/animation/ObjectAnimator</a></p>
  <p>and seeing the xml code such as</p>
  <pre><code>&lt;objectAnimator xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
              android:duration=&quot;1000&quot;
              android:repeatCount=&quot;1&quot;
              android:repeatMode=&quot;reverse&quot;&gt;
      &lt;propertyValuesHolder android:propertyName=&quot;x&quot; android:valueTo=&quot;400&quot;/&gt;
      &lt;propertyValuesHolder android:propertyName=&quot;y&quot; android:valueTo=&quot;200&quot;/&gt;
  &lt;/objectAnimator&gt;
  </code></pre>
  <p>I pasted this on the view xml file but it does not work at all.</p>
  <p>Could anybody please tell me how to use the page correctly ?</p>