android 实现垂直的ProgressBar

I had recently come across the need for a vertical progress bar but was unable to find a solution using the existing Progress Bar widget. The solutions I came across generally required an extension of the current Progress Bar or a completely new class in it self. I wasn't convinced rolling out a new class to achieve a simple orientation change was necessary.

This article presents a simple, elegant, and most importantly, a no-hack solution to achieving a vertical progress bar. I'm going to skip the explanation and simply provide a cookie cutter solution. If you require further details feel free to contact me or leave a comment below.

Create an xml in your drawable folder (not drawable-hdpi or drawable-mdpi -- place it in drawable). For this example I call my xml vertical_progress_bar.xml

Here's what to place in the xml file:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@android:id/background">
    <shape>
      <corners android:radius="5dip" />
      <gradient
        android:startColor="#ff9d9e9d"
        android:centerColor="#ff5a5d5a"
        android:centerY="0.75"
        android:endColor="#ff747674"
        android:angle="180"
      />
    </shape>
  </item>
  <item android:id="@android:id/secondaryProgress">
    <clip android:clipOrientation="vertical" android:gravity="bottom">
      <shape>
        <corners android:radius="5dip" />
        <gradient
          android:startColor="#80ffd300"
          android:centerColor="#80ffb600"
          android:centerY="0.75"
          android:endColor="#a0ffcb00"
          android:angle="180"
        />
      </shape>
    </clip>
  </item>
  <item android:id="@android:id/progress">
    <clip android:clipOrientation="vertical" android:gravity="bottom">
      <shape>
        <corners android:radius="5dip" />
        <gradient
          android:startColor="#ffffd300"
          android:centerColor="#ffffb600"
          android:centerY="0.75"
          android:endColor="#ffffcb00"
          android:angle="180"
        />
      </shape>
    </clip>
</item>

Create an xml file called styles.xml and place it in res/values. If your project already contains styles.xml in res/values then skip this step.

Modify your styles.xml file and append the following code to the end of the file:

<style name="Widget">
</style>
<style name="Widget.ProgressBar">
  <item name="android:indeterminateOnly">true</item>
  <item name="android:indeterminateBehavior">repeat</item>
  <item name="android:indeterminateDuration">3500</item>
  <item name="android:minWidth">48dip</item>
  <item name="android:maxWidth">48dip</item>
  <item name="android:minHeight">48dip</item>
  <item name="android:maxHeight">48dip</item>
</style>
<style name="Widget.ProgressBar.Vertical">
  <item name="android:indeterminateOnly">false</item>
  <item name="android:progressDrawable">@drawable/progress_bar_vertical</item>
  <item name="android:indeterminateDrawable">@android:drawable/progress_indeterminate_horizontal</item>
  <item name="android:minWidth">1dip</item>
  <item name="android:maxWidth">12dip</item>
</style>

Add your new vertical progress bar to your layout. Here's an example:

<ProgressBar
  android:id="@+id/vertical_progressbar"
  android:layout_width="12dip"
  android:layout_height="300dip"
  style="@style/Widget.ProgressBar.Vertical"
/>

That should be all you need to do to make use of a vertical progress bar in your project. Optionally, you might have custom drawable nine-patch images that you are using for the progress bar. You should make the appropriate changes in the progress_bar_vertical.xml file. I hope this helps you out in your project!

by jagsaund from http://stackoverflow.com

原文地址：http://stackoverflow.com/questions/3926395/android-set-a-progressbar-to-be-a-vertical-bar-instead-of-horizontal

这个解决方案算是比较好的，个人认为比自己重写个垂直类要好，因为当我用旋转得来的重写类时发现部分手机无法预期显示的问题。