Question

   <LinearLayout
    android:orientation="vertical"
    android:layout_margin="10dp"
    android:paddingTop="35dp"
    android:layout_width="200dp"
    android:layout_gravity="center" android:layout_height="fill_parent">

I want to make it fill 50% of the android screen instead of the 200dp

Answer 1

Wrap your linearlayout in another linearlayout where you’ve set the weightsum to 100.
Then set the layout_weight of the child linearlayout to 50 and it will take up 50% of the screen.
Like this:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:weightSum="100">

    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="50">
</LinearLayout>
<LinearLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="50">
</LinearLayout>