小记：xml画一个爱心。

aixin.xml：

<!-- height:width=viewportHeight:viewportWidth -->
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:height="256dp"
    android:viewportHeight="32"
    android:viewportWidth="32"
    android:width="256dp" >

    <path
        android:fillColor="#D50000"
        android:pathData="M20.5,9.5
        c-1.955,0,-3.83,1.268,-4.5,3
        c-0.67,-1.732,-2.547,-3,-4.5,-3
        C8.957,9.5,7,11.432,7,14
        c0,3.53,3.793,6.257,9,11.5
        c5.207,-5.242,9,-7.97,9,-11.5
        C25,11.432,23.043,9.5,20.5,9.5z" />

</vector>

activity_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" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:src="@drawable/aixin" />

</RelativeLayout>