如何将数据绑定到进度条的属性?

这是我观点的简化版本:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView android:id="@+id/text1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:layout_alignParentLeft="true"/>
<ProgressBar android:id="@+id/progress_bar"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/text1"
    />
</RelativeLayout>

我使用与记事本教程相同的方法将数据放入视图中:

String[] from = new String[]{MyDbAdapter.KEY_AMOUNT};
int[] to = new int[]{R.id.text1};
SimpleCursorAdapter list_adapter = 
    new SimpleCursorAdapter(this, R.layout.item_row, myCursor, from, to);
setListAdapter(list_adapter);