title: why file in gitignore will be modified after android studio compile?
body: <p>I have a file called VersionUtil and set it into the gitignore.
  In the gitignore file, I have</p>
  
  <pre><code># Git info
  app/src/main/java/com/test/util/VersionUtil.java
  </code></pre>
  
  <p>Before I run the project in android studio, there's a line of code in VersionUtil.java:</p>
  
  <pre><code>public static final String COMMIT_INFO = "info".
  </code></pre>
  
  <p>I ran  git status and it returned</p>
  
  <pre><code>Your branch is up-to-date with 'origin/develop'.
  </code></pre>
  
  <p>However, after I run the project, VersionUtil.java was changed. That line is:</p>
  
  <pre><code>public static final String COMMIT_INFO = "6a604 XXXXX ".
  </code></pre>
  
  <p>The git status returned</p>
  
  <pre><code>modified:   app/src/main/java/com/test/util/VersionUtil.java
  </code></pre>
  
  <p>Do you guys have any idea? Why the file in gitignore is still being tracked? Any help would be appreciated.</p>