android progressBar自下而上加载

<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="45dp"
android:layout_height="45dp"
android:progressDrawable="@drawable/proress_style"
android:background="@drawable/progress_bg"
android:indeterminateOnly="false"
android:indeterminate="false"
android:layout_centerInParent="true"
android:max="100" />

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- 设置进度条颜色图像资源 -->
<item android:id="@android:id/progress">
<clip
android:clipOrientation="vertical"
android:gravity="bottom"
android:drawable="@drawable/progress_drawable" >
</clip>
</item>
</layer-list>