<LinearLayout xmlns:android="http://s...content-available-to-author-only...d.com/apk/res/android"
    xmlns:tools="http://s...content-available-to-author-only...d.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".Main_fragment" >

    <Button
        android:id="@+id/buttonTrocar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_Trocar" />

   <fragment
       class="com.example.felipepr5.Fragment_conteudo"
       android:id="@+id/myfragment"
       android:layout_width="0px"
       android:layout_weight="4"
       android:layout_height="match_parent" />

</LinearLayout>