Layout will not match_parent - Android Q&A, Help & Troubleshooting

I don't understand why these forums force me to post software development related topics in other forums because I don't have 10 posts yet....no logic in it.
Anyways...
I am trying to add a layout to my main layout at runtime.
The child layout being added is specified in an xml file as follows. My problem is that the layout is not matching the parent in height or width, it is just wrapping content. I don't understand why the match_parent values are being ignored.
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="FORUM WILL NOT LET ME POST URL"
android:id="@+id/midLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:orientation="vertical"
android:layout_weight="1"
android:background="@color/white" >
<Button android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello, I am a Button" />
</LinearLayout>
Java
Code:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
root=(RelativeLayout)findViewById(R.id.main_layout);
root.addView((View) LayoutInflater.from(this).inflate(R.layout.mid_layout,null));
Can anyone provide any clarification as to what is going wrong here?

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Anyone?