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PO(FrameLayout) findViewById - returns null?
 

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    <p>Why do I always (FrameLayout) findViewById always returns null? The file exists. Working with Google Maps. I read the related topics. Powered by: Project-Clean. Delete folder gen.</p> <pre><code> protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.travel_map_activity); mapView = (MapView) findViewById(R.id.travelMapView); FrameLayout mainLayout = (FrameLayout) findViewById(R.id.mapFrame);//null } </code></pre> <p>What's the problem?</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/mapFrame" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;TextView android:id="@+id/tvTop" android:layout_width="fill_parent" android:layout_height="20dip" android:background="#FFFFFF" android:gravity="top|center_horizontal" android:text="FLOATING VIEW - TOP" android:textColor="#000000" android:textStyle="bold" /&gt; &lt;LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;ListView android:id="@+id/lvMain" android:layout_width="fill_parent" android:layout_height="wrap_content" /&gt; &lt;/LinearLayout&gt;&lt;/FrameLayout&gt; </code></pre> <p>travel_map_activity.xml</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" &gt; &lt;com.google.android.maps.MapView android:id="@+id/travelMapView" android:layout_width="fill_parent" android:layout_height="fill_parent" android:apiKey="key" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>thanks</p>
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