三種方式實現自定義圓形進度條ProgressBar

1、經過動畫實現

定義res/anim/loading.xml以下：

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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <animation-list android:oneshot="false"  
3. xmlns:android="http://schemas.android.com/apk/res/android">  
4.   <item android:duration="150" android:drawable="@drawable/loading_01" />  
5.   <item android:duration="150" android:drawable="@drawable/loading_02" />  
6.   <item android:duration="150" android:drawable="@drawable/loading_03" />  
7.   <item android:duration="150" android:drawable="@drawable/loading_04" />  
8.   <item android:duration="150" android:drawable="@drawable/loading_05" />  
9.   <item android:duration="150" android:drawable="@drawable/loading_06" />  
10.   <item android:duration="150" android:drawable="@drawable/loading_07" />  
11. </animation-list>   

<?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>

2、經過自定義顏色實現

定義res/drawable/progress_small.xml以下：

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <rotate xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:fromDegrees="0"  
4.     android:pivotX="50%"  
5.     android:pivotY="50%"  
6.     android:toDegrees="360" >  
7.     <shape  
8.         android:innerRadiusRatio="3"  
9.         android:shape="ring"  
10.         android:thicknessRatio="8"  
11.         android:useLevel="false" >  
12.         <gradient  
13.             android:centerColor="#FFFFFF"  
14.             android:centerY="0.50"  
15.             android:endColor="#1E90FF"  
16.             android:startColor="#000000"  
17.             android:type="sweep"  
18.             android:useLevel="false" />  
19.     </shape>  
20. </rotate>  

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="360" >
    <shape
        android:innerRadiusRatio="3"
        android:shape="ring"
        android:thicknessRatio="8"
        android:useLevel="false" >
        <gradient
            android:centerColor="#FFFFFF"
            android:centerY="0.50"
            android:endColor="#1E90FF"
            android:startColor="#000000"
            android:type="sweep"
            android:useLevel="false" />
    </shape>
</rotate>

3、使用一張圖片進行自定義
定義res/drawable/progress_small.xml以下：

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1. <rotate xmlns:android="http://schemas.android.com/apk/res/android"  
2.     android:drawable="@drawable/spinner_black_16"  
3.     android:pivotX="50%"  
4.     android:pivotY="50%"  
5.     android:fromDegrees="0"  
6.     android:toDegrees="360" />  

<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/spinner_black_16"
    android:pivotX="50%"
    android:pivotY="50%"
    android:fromDegrees="0"
    android:toDegrees="360" />

使用方法都同樣, 以下：

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1. <ProgressBar  
2.     android:layout_width="wrap_content"  
3.     android:layout_height="wrap_content"  
4.     android:indeterminateDrawable="@drawable/progress_small"/>  

<ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:indeterminateDrawable="@drawable/progress_small"/>

也能夠根據須要經過設置style來設置其大小！ 通常只有使用默認的ProgrressBar的時候採用。對於上述三種自定義的方式，建議修改直接修改圖片大小，或者shape；

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1. <ProgressBar  
2.     android:layout_width="wrap_content"  
3.     android:layout_height="wrap_content"  
4.     android:layout_centerInParent="true"  
5.     style="?android:attr/progressBarStyleSmall"  
6.     android:indeterminateDrawable="@drawable/progress_small"/>  

<ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        style="?android:attr/progressBarStyleSmall"
        android:indeterminateDrawable="@drawable/progress_small"/>

設置成progressBarStyleSmall後，圖標變小。　

設置成progressBarStyleLarge後，圖標變大