java - “LinearLayout or its RelativeLayout parent is useless” warning -

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i need use layout_below property of relativelayout , weightsum property of linearlayout.

the code works disappointing warning.

i'm doing wrong?

tyvm!

code attached:

<relativelayout     android:id="@+id/filtro"     android:layout_width="fill_parent"     android:layout_height="42dp"     android:background="@color/grisoscuro"     android:layout_below="@+id/header_separator_filtro" >      <linearlayout          android:layout_width="fill_parent"         android:layout_height="fill_parent"         android:weightsum="1.0">              <button                  android:id="@+id/btfiltrocategoriasnoticias"                 android:layout_height="wrap_content"                 android:layout_weight=".5"                 android:layout_width="0dp"                 android:textcolor="@color/blanco"                 android:gravity="center"                 android:textsize="16sp"                 android:background="@color/grisoscuro"                 android:text="@string/bt_noticias_categorias"                 style="?android:attr/borderlessbuttonstyle"             />              <button                  android:id="@+id/btbusqueda"                 android:layout_height="wrap_content"                 android:layout_weight=".5"                 android:layout_width="0dp"                 android:textsize="12sp"                 android:background="@color/grisoscuro"                 style="?android:attr/borderlessbuttonstyle"             />     </linearlayout> </relativelayout>

layout_below property doesn't have belong relativelayout, can modify code , rid of relativelayout this: 

<linearlayout  android:id="@+id/filtro" android:layout_width="fill_parent" android:layout_height="42dp" android:background="@color/grisoscuro" android:layout_below="@+id/header_separator_filtro"  android:weightsum="1.0">          <button              android:id="@+id/btfiltrocategoriasnoticias"             android:layout_height="wrap_content"             android:layout_weight=".5"             android:layout_width="0dp"             android:textcolor="@color/blanco"             android:gravity="center"             android:textsize="16sp"             android:background="@color/grisoscuro"             android:text="@string/bt_noticias_categorias"             style="?android:attr/borderlessbuttonstyle"         />          <button              android:id="@+id/btbusqueda"             android:layout_height="wrap_content"             android:layout_weight=".5"             android:layout_width="0dp"             android:textsize="12sp"             android:background="@color/grisoscuro"             style="?android:attr/borderlessbuttonstyle"         /> </linearlayout>

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