1.xml代码方式一：如下(此shape是放到drawable目录下的)
<rotate xmlns:android="/apk/res/android"android:fromDegrees="0"android:pivotX="50%"android:pivotY="50%"android:toDegrees="360"><shapeandroid:innerRadiusRatio="3"android:shape="ring"android:thicknessRatio="8"android:useLevel="false"><gradientandroid:centerColor="#ff0000"android:endColor="#111111"android:startColor="#B23AEE"android:type="sweep"android:useLevel="false" /></shape></rotate>
2.看下效果图：
xml代码方式二如下：
<?xml version="1.0" encoding="utf-8"?><rotate xmlns:android="/apk/res/android"android:fromDegrees="0"android:pivotX="50%"android:pivotY="50%"android:toDegrees="360"><shapeandroid:innerRadiusRatio="3"android:shape="ring"android:thicknessRatio="20"android:useLevel="false"><gradientandroid:centerColor="#66FF0000"android:endColor="#FF0000"android:startColor="#FFFFFF"android:type="sweep" /></shape></rotate>
然后直接在progressBar中的indeterminateDrawable属性中使用即可
<ProgressBarandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:indeterminateDrawable="@drawable/custom_progressbar"app:layout_constraintBottom_toTopOf="@+id/btOpen"app:layout_constraintEnd_toEndOf="@+id/btOpen"app:layout_constraintHorizontal_bias="0.496"app:layout_constraintStart_toStartOf="@+id/btOpen"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.34" />
