三种方式实现自定义圆形页面加载中效果的进度条

To get a ProgressBar in the default theme that is to be used on white/light back ground, use one of the inverse styles:

<ProgressBarstyle="@android:style/Widget.ProgressBar.Inverse"/>
<ProgressBarstyle="@android:style/Widget.ProgressBar.Large.Inverse"/>
<ProgressBarstyle="@android:style/Widget.ProgressBar.Small.Inverse"/>

进度条

<ProgressBar android:layout_width="fill_parent" android:layout_height="wrap_content"style="?android:attr/progressBarStyleHorizontal"/>

一、通过动画实现
定义res/anim/loading.xml如下：
<?xml version="1.0" encoding="UTF-8"?>
<animation-list android:oneshot="false"
xmlns:android="http://schemas.android.com/apk/res/android">
<item android:duration="150" android:drawable="@drawable/loading_01" />
<item android:duration="150" android:drawable="@drawable/loading_02" />
<item android:duration="150" android:drawable="@drawable/loading_03" />
<item android:duration="150" android:drawable="@drawable/loading_04" />
<item android:duration="150" android:drawable="@drawable/loading_05" />
<item android:duration="150" android:drawable="@drawable/loading_06" />
<item android:duration="150" android:drawable="@drawable/loading_07" />
</animation-list>

在layout文件中引用如下：
<ProgressBar android:id="@+id/loading_process_dialog_progressBar"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:indeterminate="false" android:indeterminateDrawable="@anim/loading" />

二、通过自定义颜色实现
定义res/drawable/dialog_style_xml_color.xml如下：
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:pivotX="50%" android:pivotY="50%" android:fromDegrees="0"
android:toDegrees="360">
<shape android:shape="ring" android:innerRadiusRatio="3"
android:thicknessRatio="8" android:useLevel="false">
<gradient android:type="sweep" android:useLevel="false"
android:startColor="#FFFFFF" android:centerColor="#FFDC35"
android:centerY="0.50" android:endColor="#CE0000" />
</shape>
</rotate>

在layout文件中引用如下：
<ProgressBar android:id="@+id/loading_process_dialog_progressBar"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:indeterminate="false" android:indeterminateDrawable="@drawable/dialog_style_xml_color" />

三、使用一张图片进行自定义
定义res/drawable/dialog_style_xml_icon.xml如下：
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<rotate android:drawable="@drawable/dialog_progress_round"
android:fromDegrees="0.0" android:toDegrees="360.0" android:pivotX="50.0%"
android:pivotY="50.0%" />
</item>
</layer-list>

在layout文件中引用如下：
<ProgressBar android:id="@+id/loading_process_dialog_progressBar"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:indeterminate="false" android:indeterminateDrawable="@drawable/dialog_style_xml_icon" />

main.xml如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:gravity="center"
android:background="#FFF">
<Button android:text="@string/anim" android:id="@+id/anim"
android:layout_width="120dip" android:layout_height="wrap_content" />
<Button android:text="@string/color" android:id="@+id/color"
android:layout_width="120dip" android:layout_height="wrap_content" />
<Button android:text="@string/icon" android:id="@+id/icon"
android:layout_width="120dip" android:layout_height="wrap_content" />
</LinearLayout>