Android - Optimize LinearLayout and layout_weight using RelativeLayout

LinearLayoutWithWeight.xml

<!--I mostly use LinearLayout and layout_weight to give views the same width or height in a layout-->
<!--For example-->

<LinearLayout
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
        
    <Button
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:layout_width="0dp"/>
        
    <Button
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:layout_width="0dp"/>
</LinearLayout>

<!-- In certain case, such as a 2x2 button, -->
<!-- you'll need a Vertical LinearLayout with 2 Horizontal LinearLayout and 2 Buttons in each layout-->
<!-- Like this-->

<LinearLayout>
    <LinearLayout>
        <Button />
        <Button />
    </LinearLayout>
    
    <LinearLayout>
        <Button />
        <Button />
    </LinearLayout>
</LinearLayout>

<!--this solution will end up with more deeper UI hierarchy and it is not recommended because it can let performance down-->

<!--Now, let's check OptimizedLayout.xml--> 

OptimizedLayout.xml

<!-- So, I found this solution in StackOverflow -->
<!-- http://stackoverflow.com/a/7784186/2950382 -->

<!-- He or She suggest a RelativeLayout and add a dummy view, place it in centerHorizontalParent-->
<!-- For example... -->

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <!-- Here is the dummies!-->
    <View
        android:layout_centerHorizontal="true"
        android:id="@+id/splitter"
        android:layout_width="0dp"
        android:layout_height="0dp" />

    <Button
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_toLeftOf="@id/splitter"
        android:id="@+id/button_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_toRightOf="@+id/splitter"
        android:id="@+id/button_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
        
    <Button
        android:layout_toLeftOf="@id/splitter"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/button_1"
        android:id="@+id/button_3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:layout_toRightOf="@id/splitter"
        android:layout_below="@id/button_2"
        android:layout_alignParentRight="true"
        android:id="@+id/button_4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</RelativeLayout>