title: Remove app title bar android
body: <p>I know this question has been asked million times but whichever method I use is not good for me.</p>
  
  <p>If I use </p>
  
  <pre><code>android:theme="@android:style/Theme.NoTitleBar" 
  </code></pre>
  
  <p>in the manifest file, the whole theme of the app changes. If I put </p>
  
  <pre><code>requestWindowFeature(Window.FEATURE_NO_TITLE);
  </code></pre>
  
  <p>in the onCreate activities, it shows up shortly when starting an app. </p>
  
  <p>Btw I don't have any theme selected, just using standard android.</p>