layouts.xml

//sw600dp/activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context="telematic.cl.popmovies.MainActivity">
    <fragment
        android:id="@+id/fragment_forecast"
        android:name="telematic.cl.popmovies.MoviesFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2"
        tools:layout="@android:layout/list_content" />
    <FrameLayout
        android:id="@+id/detail_container"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1" />
</LinearLayout>

//fragment_main.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="telematic.cl.popmovies.MoviesFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <GridView
        android:id="@+id/gridview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:columnWidth="185px"
        android:numColumns="@integer/columns"
        android:stretchMode="none" />
                </FrameLayout>

 10-15 09:32:48.332 13391-13391/? E/AndroidRuntime:  Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

    protected void onCreate(Bundle savedInstanceState
    ...
            setContentView(R.layout.activity_main); //can't inflate!
...