android的图片资源除了常规图片之外，还支持自定义的颜色图片，分为矩形和圆角矩形。下面分别说明一下这两种自定义图片的用法。

1.矩形颜色图片

<resources>
    <drawable name="red_rectangle">#f00</drawable>
    <drawable name="blue_rectangle">#0000ff</drawable>
    <drawable name="green_rectangle">#f0f0</drawable>
</resources>

// Get a drawable
ColorDrawable redDrawable = (ColorDrawable)
activity.getResources().getDrawable(R.drawable.red_rectangle);
//Set it as a background to a text view
textView.setBackgroundDrawable(redDrawable);

<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textAlign="center"
android:background="@drawable/red_rectangle"/>

2.圆角矩形图片

新建：/res/drawable/my_rounded_rectangle.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#f0600000"/>
    <stroke android:width="3dp" color="#ffff8080"/>
    <corners android:radius="13dp" />
    <padding android:left="10dp" android:top="10dp"
                    android:right="10dp" android:bottom="10dp" />
</shape>

/ /Get a drawable
GradientDrawable  roundedRectangle=(GradientDrawable)activity.getResources().getDrawable(R.drawable.my_rounded_rectangle);
//Set it as a background to a text view
textView.setBackgroundDrawable(roundedRectangle);

原文：http://blog.csdn.net/zzqlivecn/article/details/7381148