How rotate line in Android XML?

Question

I'm trying to draw a diagonal line in an Android app with the XML, but it is not working. It simply draws a horizontal line.

main.xml:

<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="match_parent"     android:paddingBottom="@dimen/activity_vertical_margin"     android:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     tools:context=".TestActivity" >      <RelativeLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_alignParentLeft="true"         android:layout_alignParentTop="true"          style="@style/diagonalStyle">     </RelativeLayout>  </RelativeLayout> 

styles.xml:

<resources xmlns:android="http://schemas.android.com/apk/res/android">      <style name="diagonalStyle">         <item name="android:background">@drawable/background</item>     </style>  </resources> 

background.xml:

<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="http://schemas.android.com/apk/res/android" >      <item>         <rotate             android:fromDegrees="0"             android:toDegrees="45"             android:pivotX="50%"             android:pivotY="50%" >             <shape                 android:shape="line"                 android:top="1dip" >                 <stroke                     android:width="1dip"                     android:color="#FF0000" />             </shape>         </rotate>     </item>  </layer-list> 

Answer 1

You really only needed one number change to get it to work. Just Change the fromDegrees to 45:

<item>     <rotate             android:fromDegrees="45"             android:toDegrees="45"             android:pivotX="50%"             android:pivotY="50%" >         <shape                 android:shape="line"                 android:top="1dip" >             <stroke                     android:width="1dip"                     android:color="#FF0000" />         </shape>     </rotate> </item> 

The rotate drawable http://developer.android.com/reference/android/graphics/drawable/RotateDrawable.html

actually uses the Property Animation format http://developer.android.com/guide/topics/resources/animation-resource.html

Whereas you are making a non-animating diagonal line, you want it to start out at 45 degrees, and end up at 45 degrees also. So setting them both to 45 is the norm.