自定义ProgressBar的加载效果

【转】http://gundumw100.iteye.com/blog/1289348

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: 
<ProgressBar style="@android:style/Widget.ProgressBar.Inverse"/> 
<ProgressBar style="@android:style/Widget.ProgressBar.Large.Inverse"/> 
<ProgressBar style="@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: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: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:layout_width="wrap_content"
android:layout_height="wrap_content"
  android:indeterminate="false" android:indeterminateDrawable="@drawable/dialog_style_xml_icon" />

或者使用<animated-rotate/>旋转一张图片： 

<ProgressBar
        style="@android:style/Widget.ProgressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:indeterminateDrawable="@drawable/custom_progress_draw"
        android:indeterminate="false" />

custom_progress_draw.xml: 

<?xml version="1.0" encoding="utf-8"?>
<animated-rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/circular"
    android:pivotX="50%"
    android:pivotY="50%" />

circular就是一张转动效果的静态图片。 

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>