自定義Android圓形進度條：ProgressWheel

這是一個自定義Android組件，用于代替標準進度條組件。實現各種進度條樣式，包括圓環，掃描等。

XML:
To implement the view in your xml layout do the following:

1. Add the following to your attrs.xml file (in res/values):

   <declare-styleable name="ProgressWheel">   
   <attr name="text" format="string" />   
   <attr name="textColor" format="color" />   
   <attr name="textSize" format="dimension" />   
   <attr name="barColor" format="color" />   
   <attr name="rimColor" format="color" />   
   <attr name="rimWidth" format="dimension" />   
   <attr name="spinSpeed" format="integer" />     
   <attr name="circleColor" format="color" />     
   <attr name="radius" format="dimension" />   
   <attr name="barWidth" format="dimension" />   
   <attr name="barLength" format="dimension" />   
   </declare-styleable> 

2. Add the following code to the root view of your layout:xmlns:ProgressWheel="http://schemas.android.com/apk/res/com.visualdenim.schooltraq"

3. Add the widget code in the appropriate place in your xml file. Here's a sample implementation:

   <com.todddavies.components.progressbar.ProgressWheel   
   android:id="@+id/pw_spinner"     
   android:layout_width="200dp"    
   android:layout_height="200dp"   
   android:layout_centerInParent="true"   
   ProgressWheel:text="Authenticating..."    
   ProgressWheel:textColor="#222"   
   ProgressWheel:textSize="14sp"   
   ProgressWheel:rimColor="#330097D6"   
   ProgressWheel:barLength="60dp"    
   ProgressWheel:barColor="#0097D6"   
   ProgressWheel:barWidth="5dp"   
   ProgressWheel:rimWidth="2dp" /> 

Java:
First you need to either get a ProgressWheel from a layout file, or initalise one. Do this by:

• ProgressWheel pw = new ProgressWheel(myContext, myAttributes);
• ProgressWheel pw = (ProgressWheel) findViewById(R.id.pw_spinner);

To spin the progress wheel, you just call .spin() and to stop it spinning, you call .stopSpinning()

Incrementing the progress wheel is slightly more tricky, you call .incrementProgress(). However, this is out of 360,
(because a circle has 360 degrees), and will automatically reset once you get past 360. A percentage display is
automatically displayed.

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