條形 ProgressBar 樣式設定

佈局檔案：

  <ProgressBar
            android:id= "@+id/download_item_progressBar"
            android:layout_width= "wrap_content"
            android:layout_height ="15dp"
            android:max= "100"
            android:progress= "50"
            style= "?android:attr/progressBarStyleHorizontal
 
"
            android:progressDrawable ="@drawable/progressbar_2_style" >
        </ProgressBar >
方法一：
![這裡寫圖片描述](https://img-blog.csdn.net/20170112100723812?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhhbmdsaW5sYW5n/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
<?xml version= "1.0" encoding ="utf-8"?>
 

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:id= "@android:id/background"
        android:drawable= "@drawable/a"/>
    <item
        android:id= "@android:id/secondaryProgress"
        android:drawable= "@drawable/c">
    </item >
    <item
 
        android:id= "@android:id/progress"
        android:drawable= "@drawable/b">
    </item >
</layer-list>


方法二：
![這裡寫圖片描述](https://img-blog.csdn.net/20170112100734312?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhhbmdsaW5sYW5n/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
<?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:angle= "270"
                android:centerColor= "#666666"
                android:centerY= "0.75"
                android:endColor= "#666666"
                android:startColor= "#666666" />
        </shape >
    </item >
    <item android:id ="@android:id/progress">
        <clip >
            <shape >
                <corners android:radius ="5dip" />

                <gradient
                    android:angle= "270"
                    android:centerColor= "#da1f3e"
                    android:centerY= "0.75"
                    android:endColor= "#da1f3e"
                    android:startColor= "#da1f3e" />
            </shape>
        </clip >
    </item >
    <item android:id ="@android:id/secondaryProgress">
        <clip >
            <shape >
                <corners android:radius ="5dip" />

                <gradient
                    android:angle= "270"
                    android:centerColor= "#fed7ec"
                    android:centerY= "0.75"
                    android:endColor= "#fed7ec"
                    android:startColor= "#fed7ec" />
            </shape>
        </clip >
    </item >

</layer-list>