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ProgressBar height = match_parent

I have a RelativeLayout with a radio block and a progress bar. The heatsink must determine the height of the RelativeLayout, so the ProgressBar must be the same height as the beacon. But this is not so.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:progressDrawable="@drawable/progress" />

    <RadioButton
        android:id="@+id/radioButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>
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I had a similar problem trying to position the progress indicator behind other views. Switching to FrameLayoutusing gravity="center"for both child views worked for me:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

   <ProgressBar
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:progress="50" />

   <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">
        ...
   </LinearLayout>
</FrameLayout>
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