不使用xml生成背景图片的工具

 直接操作Drawable生成圆角，边框线等效果

用法先行：

rootView.findViewById<View>(R.id.videoCoverBottomBackgroundView)?.apply {
    background = DrawableUtil(context)
        .setRoundRadiusSpecified(bottomLeft = roundingRadius, bottomRight = roundingRadius)
        .setFillColors(intArrayOf(0x00000000.toInt(), 0xB3000000.toInt()))
        .setOrientation(GradientDrawable.Orientation.TOP_BOTTOM)
        .generateDrawable()
}

git：github.com/ZHB5145/Dra…

import android.content.Context
import android.graphics.drawable.Drawable
import android.graphics.drawable.GradientDrawableclass

 DrawableUtil(val context: Context) {
    companion object {
        private fun dip2px(context: Context, dpValue: Float): Int {
            val scale = getScreenDensity(context)
            return (dpValue * scale + 0.5f).toInt()
        }
        private fun getScreenDensity(context: Context): Float {
            return context.resources.displayMetrics.density
        }
    }
    private var strokeWidth = 0
    private var strokeColor = 0xffffffff.toInt()

    private var fillColors = intArrayOf(0xffffffff.toInt(), 0xffffffff.toInt()) 
    private var orientation = GradientDrawable.Orientation.LEFT_RIGHT

    private var useUnifiedCorner = true
    private var unifiedRoundRadius = 0
    private var specifiedTopLeftRoundRadius = 0
    private var specifiedTopRightRoundRadius = 0 
    private var specifiedBottomLeftRoundRadius = 0
    private var specifiedBottomRightRoundRadius = 0

    fun generateDrawable(): Drawable {
        val gd = GradientDrawable()
        gd.orientation = this@DrawableUtil.orientation
        gd.colors = this@DrawableUtil.fillColors
        gd.setStroke(this@DrawableUtil.strokeWidth, this@DrawableUtil.strokeColor)
        if (useUnifiedCorner) {
            gd.cornerRadius = unifiedRoundRadius.toFloat()
        } else {
            gd.cornerRadii = floatArrayOf(
                specifiedTopLeftRoundRadius.toFloat(),
                specifiedTopLeftRoundRadius.toFloat(),

                specifiedTopRightRoundRadius.toFloat(),
                specifiedTopRightRoundRadius.toFloat(),

                specifiedBottomRightRoundRadius.toFloat(),
                specifiedBottomRightRoundRadius.toFloat(),

                specifiedBottomLeftRoundRadius.toFloat(),
                specifiedBottomLeftRoundRadius.toFloat(),
            )
        }
        return gd
    }

    fun setStrokeWidth(strokeWidth: Int): DrawableUtil {
        this.strokeWidth = strokeWidth
        return this
    }
    fun setStrokeColor(strokeColor: Int): DrawableUtil {
        this.strokeColor = strokeColor
        return this
    }
    fun setStrokeColor(strokeColor: Long): DrawableUtil {
        this.strokeColor = strokeColor.toInt()
        return this
    }
    fun setFillColors(fillColors: IntArray): DrawableUtil {
        this.fillColors = fillColors
        return this
    }
    fun setFillColors(fillColors: LongArray): DrawableUtil {
        this.fillColors = fillColors
            .map { it.toInt() }
            .toIntArray()
        return this
    }
    fun setFillColor(fillColor: Int): DrawableUtil {
        this.fillColors = intArrayOf(fillColor, fillColor)
       return this
    }
    fun setFillColor(fillColor: Long): DrawableUtil {
        this.fillColors = intArrayOf(fillColor.toInt(), fillColor.toInt())
        return this
    }
    fun setOrientation(orientation: GradientDrawable.Orientation): DrawableUtil {
        this.orientation = orientation
        return this
    }
    fun setRoundRadiusSpecified(topLeft: Int = 0, topRight: Int = 0, bottomLeft: Int = 0, bottomRight: Int = 0, useDip: Boolean = false): DrawableUtil {
        if (useDip) {
            this.specifiedTopLeftRoundRadius = dip2px(context, topLeft.toFloat())
            this.specifiedTopRightRoundRadius = dip2px(context, topRight.toFloat())
            this.specifiedBottomLeftRoundRadius = dip2px(context, bottomLeft.toFloat())
            this.specifiedBottomRightRoundRadius = dip2px(context, bottomRight.toFloat())
        } else {
            this.specifiedTopLeftRoundRadius = topLeft
            this.specifiedTopRightRoundRadius = topRight
            this.specifiedBottomLeftRoundRadius = bottomLeft
            this.specifiedBottomRightRoundRadius = bottomRight
        }
        useUnifiedCorner = false
        return this
    }
    fun setRoundRadiusUnified(roundRadius: Int, useDip: Boolean = false): DrawableUtil {
        if (useDip) {
            this.unifiedRoundRadius = dip2px(context, roundRadius.toFloat())
        } else {
            this.unifiedRoundRadius = roundRadius
        }
        useUnifiedCorner = true
        return this
    }
}