Can not get element from layout

Question

I have 2 activities. The 2nd .xml looks like:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <ListView 
            android:id="@+id/TrainsListView"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" 
        />
</LinearLayout>

Part of manifest:

<activity android:name="TrainsActivity">

</activity>

And I'm trying to get TrainsListView:

mListView = (ListView) findViewById(R.id.TrainsListView);

But after this mlistView is null. Why?

Answer 1

I'm guessing this is happening in your Activity's onCreate() method because you are calling findViewById() before you have called setContentView(). If that's not the case then please show more of your code.