How To Make Layout To Be 80% Of The Width Of The Screen?

How can I make some layout to be for example 80% or 90% of the width of the screen, no matter what is the screen size or DPI? I tried with ' but I get 80% of the height then. EDIT:

Solution 1:

android:layout_weight is based on the android:orientation of your LinearLayout - if you want your layout to take up 80% of the width, you need a LinearLayout with an android:orientation="horizontal"

<LinearLayout
    android:id="@+id/your_outer_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" > <!-- note that vertical is the default -->

    <!-- Other elements here -->

    <LinearLayout
        android:id="@+id/eighty_percent_layout_holder
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="1">
        <View
            android:id="@+id/your_eighty_percent_layout"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.8" />
     </LinearLayout>

    <!-- Other elements here -->
</LinearLayout>