android Progress style (长进度条)：
progress_bgbar.xml:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@android:id/background" android:drawable="@drawable/bar_background">
</item>
<item android:id="@android:id/progress" android:drawable="@drawable/bar_progress">
</item>
</layer-list>
然后：
<ProgressBar android:id="@+id/progressBar1"
style="?android:attr/progressBarStyleHorizontal" android:layout_width="750dp"
android:layout_height="wrap_content" android:layout_alignParentRight="true"
android:layout_alignParentTop="true" android:layout_below="@+id/textView2"
android:layout_marginRight="30dp" android:layout_marginTop="30dp"
android:layout_toRightOf="@+id/header" android:minHeight="10dp"
android:progressDrawable="@drawable/progress_barbg" />