应用系统样式延伸

 <ProgressBar        android:id="@+id/progressBar1"        style="?android:attr/progressBarStyleLarge"        android:layout_width="wrap_content"        android:layout_height="wrap_content"                android:layout_gravity="center_horizontal"/>

引用android系统自定义的属性：

style="?android:attr/progressBarStyleLarge"

尝试

<pre code_snippet_id="181972" snippet_file_name="blog_20140210_4_2924579" name="code" class="html">  <!-- Default ProgressBar style. This is a medium circular progress bar. -->        <attr name="progressBarStyle" format="reference" />        <!-- Horizontal ProgressBar style. This is a horizontal progress bar. -->        <attr name="progressBarStyleHorizontal" format="reference" />        <!-- Small ProgressBar style. This is a small circular progress bar. -->        <attr name="progressBarStyleSmall" format="reference" />        <!-- Small ProgressBar in title style. This is a small circular progress bar that will be placed in title bars. -->        <attr name="progressBarStyleSmallTitle" format="reference" />        <!-- Large ProgressBar style. This is a large circular progress bar. -->        <attr name="progressBarStyleLarge" format="reference" />        <!-- Inverse ProgressBar style. This is a medium circular progress bar. -->        <attr name="progressBarStyleInverse" format="reference" />        <!-- Small inverse ProgressBar style. This is a small circular progress bar. -->        <attr name="progressBarStyleSmallInverse" format="reference" />        <!-- Large inverse ProgressBar style. This is a large circular progress bar. -->        <attr name="progressBarStyleLargeInverse" format="reference" />

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