Android :: Audio Player Not Working On High Resolution

this is my layout for audio player the problem is when resolution is high there is balck space vacant under the play and delete button which located at the bottom of the ui. what i do?

<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="840dp"
android:background="#333134"
>
<LinearLayout
android:layout_marginTop="20dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content".................