title: android findViewById returns null
body: <p>I have a problem finding a linear layout ... 
  This is the xml Layout:    </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:binding="http://www.gueei.com/android-binding/"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:fillViewport="true"
      tools:context=".controllers.ElencoInfrazioni" &gt;
  
  &lt;LinearLayout
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:orientation="vertical"
      android:padding="15dp" &gt;
  
      &lt;LinearLayout
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:orientation="horizontal" &gt;
  
          &lt;TextView
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_gravity="center_vertical"
              android:text="Infrazione: " /&gt;
  
          &lt;Spinner
              android:id="@+id/elencoInfrazioni"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:layout_weight="1" /&gt;
      &lt;/LinearLayout&gt;
  
      &lt;TableLayout
          android:id="@+id/tabellaDatiElencoInfrazioni"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:layout_marginTop="10dp"
          android:stretchColumns="*"
          android:visibility="gone" &gt; 
  
          &lt;TableRow&gt;
              &lt;TextView
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="Art. 3: " /&gt;
  
              &lt;TextView
                  android:id="@+id/articolo3ElencoInfrazioni"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="non specificato"
                  android:textStyle="bold" /&gt;
  
              &lt;LinearLayout
                  android:id="@+id/panelArticolo4ElencoInfrazioni"
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:orientation="horizontal" &gt;
  
                  &lt;TextView
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:text="Art. 4: " /&gt;
  
                  &lt;TextView
                      android:id="@+id/articolo4ElencoInfrazioni"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:text="non specificato"
                      android:textStyle="bold" /&gt;
              &lt;/LinearLayout&gt;
          &lt;/TableRow&gt;
          ....
  </code></pre>
  
  <p>The code that handles layout:</p>
  
  <pre><code>@Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
              this.setContentView(R.layout.elenco_infrazioni);
      init();
  }
  private void init() {
      tabellaDati = (TableLayout) this
              .findViewById(R.id.tabellaDatiElencoInfrazioni);
      elencoInfrazioni = (Spinner) this.findViewById(R.id.elencoInfrazioni);
      panelArticolo4 = (LinearLayout) this. 
              findViewById(R.id.panelArticolo4ElencoInfrazioni);
      articolo3 = (TextView) this
              .findViewById(R.id.articolo3ElencoInfrazioni);
      articolo4 = (TextView) this
              .findViewById(R.id.articolo4ElencoInfrazioni);
  }
  </code></pre>
  
  <p>Every findViewById is ok except LinearLayout panelArticolo4 that gives me null...I need the linear layout to set its visibility..What I'm doing wrong?</p>
  
  <p>Thanks in advance</p>