I wanted to create a custom bottom button bar layout, I've created a xml file :

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
style="@android:style/ButtonBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="0dp" >

<Button
    android:id="@+id/media_menu_button"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_margin="0dp"
    android:layout_weight="1"
    android:text="@string/media_menu_button" />

<Button
    android:id="@+id/scenario_menu_button"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_margin="0dp"
    android:layout_weight="1"
    android:text="@string/scenario_menu_button" />

 <Button
    android:id="@+id/rooms_menu_button"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_margin="0dp"
    android:layout_weight="1"
    android:text="@string/rooms_menu_button" />

<Button
    android:id="@+id/shortcut_menu_button"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_margin="0dp"
    android:layout_weight="1"
    android:text="@string/shortcut_menu_button" />

as you can see I've given all the buttons width 0dp and weight of 1. then, I've created a class that extends the linear layout class :

public class BeLightBottomBar extends LinearLayout implements OnClickListener {
private LayoutInflater mInflater; 
private Context contexnt;

private Button mShortcutMenuButton;

private Button mRoomsMenuButton;

private Button mScenarioMenuButton;

private Button mMediaMenuButton;

public BeLightBottomBar(Context context, AttributeSet attrs) {
    super(context, attrs);

    //inflate the view
    this.contexnt = context;
    mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    LinearLayout barView = (LinearLayout) mInflater.inflate(R.layout.belight_bottombar, null);
    addView(barView);

    //get all the instances of the components of the bar
    mShortcutMenuButton = (Button) barView.findViewById(R.id.shortcut_menu_button);
    mRoomsMenuButton = (Button) barView.findViewById(R.id.rooms_menu_button);
    mScenarioMenuButton = (Button) barView.findViewById(R.id.scenario_menu_button);
    mMediaMenuButton = (Button) barView.findViewById(R.id.media_menu_button);

    //set this as a click listener
    mShortcutMenuButton.setOnClickListener(this);
    mRoomsMenuButton.setOnClickListener(this);
    mScenarioMenuButton.setOnClickListener(this);
    mMediaMenuButton.setOnClickListener(this);
    ... 
    ...
    ...
  }

the problem is when i add this class to the main activity xml

<belight.homecontrol.components.BeLightBottomBar
    android:id="@+id/button_bar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_margin="0dp"
    android:padding="0dp" />

the weight stops working, all the buttons are different. and I don't know why !? if I just copy paste the bottom's bar xml code to the main xml file it works fine, the problem only occurs when using it as a whole.

P.S. Is it a good practice to create a component this way? Or maybe I'm doing something wrong?

Thanks, Dan