如何在Android drawable中为环形制作圆角

Question

我有一个自定义进度栏，如下所示：

这是我用来创建它的.xml代码：

background_drawable.xml

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:innerRadius="@dimen/progress_bar_radial_inner_radius"
    android:thickness="@dimen/progress_bar_radial_thickness"
    android:shape="ring"
    android:useLevel="false" >
    <solid android:color="@color/main_color_alpha"/>
</shape>

progress_drawable.xml

<?xml version="1.0" encoding="UTF-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="270"
    android:toDegrees="270">
    <shape
        android:innerRadius="@dimen/progress_bar_radial_inner_radius"
        android:thickness="@dimen/progress_bar_radial_thickness"
        android:shape="ring" >
        <solid android:color="@color/main_color"/>
    </shape>
</rotate>

我想要得到的是我用来显示进度的圆角。看起来像这样的东西：

有人对如何实现这一目标有任何想法吗？

Answer 1

好吧，我发现做我想做的事情的最简单方法是在画布上绘制进度弧，而不是使用progress_drawable.xml。这是我的代码，以防有人遇到类似问题。

class RadialProgressBar : ProgressBar {

    private val thickness = 28f
    private val halfThickness = thickness / 2
    private val startAngle = 270f
    private var boundsF: RectF? = null
    private lateinit var paint: Paint

    constructor(context: Context?) : super(context) {
        init()
    }

    constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs) {
        init()
    }

    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr) {
        init()
    }

    private fun init() {
        paint = Paint()
        paint.isAntiAlias = true
        paint.style = Paint.Style.STROKE
        paint.strokeWidth = thickness
        paint.strokeCap = Paint.Cap.ROUND
        paint.color = ContextCompat.getColor(context, R.color.main_color)

        progressDrawable = null
    }

    override fun draw(canvas: Canvas?) {
        super.draw(canvas)

        if (boundsF == null) {
            boundsF = RectF(background.bounds)
            boundsF?.inset(halfThickness, halfThickness)
        }

        canvas?.drawArc(boundsF, startAngle, progress * 3.60f, false, paint)
    }
}