title: how to fix invalid file name in android
body: <pre><code>This is my class file :
  
  
  public class FragmentOne extends Fragment {
  
      public static Fragment newInstance(Context context) {
          FragmentOne f = new FragmentOne();
  
          return f;
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
          ViewGroup root = (ViewGroup) inflater.inflate(R.layout.fragment_one, null);
          return root;
      }
  
  }
  </code></pre>
  
  <p>this is my Layout name fragment_one.xml when i try to call fragment_one in class then it should Error in console This error is coming :</p>
  
  <p>[2013-08-27 10:33:52 - FragmentPart] res\layout\ fragmentone.xml: Invalid file name: must contain only [a-z0-9_.]
  how to fix this Error please help me </p>
  
  <p>here is the code  of frgmentone.xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical" &gt;
  
      &lt;TextView
          android:id="@+id/textView1"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_centerHorizontal="true"
          android:layout_centerVertical="true"
          android:text="one" /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>