使用shape gradient创建具有渐变效果的线条

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<?xml version="1.0" encoding="utf-8"?><shape  xmlns:android="http://schemas.android.com/apk/res/android">    <gradient     android:startColor="#0f00"    android:endColor="#ff00"    /></shape>

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<?xml version="1.0" encoding="utf-8"?><shape  xmlns:android="http://schemas.android.com/apk/res/android">    <gradient     android:startColor="#0f00"    android:centerColor="#ff00"    android:endColor="#0f00"    /></shape>

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<?xml version="1.0" encoding="utf-8"?><shape  xmlns:android="http://schemas.android.com/apk/res/android">    <gradient     android:startColor="#0f00"    android:endColor="#0f00"    android:type="radial"    android:gradientRadius="50%"    /></shape>

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