安卓用shape画圆

1. 用xml画普通圆

• 效果图
  
• 用xml的shape实现

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="#FFF68F" />
    <size
        android:width="20dp"
        android:height="20dp" />
</shape>

• 用代码实现

/**
 * 获取圆型背景
 * @param colorInt 整型色值
 */
fun getCircleBg(colorInt: Int) = GradientDrawable().also {
    it.shape = GradientDrawable.OVAL
    it.setColor(colorInt)
}

/**
 * 获取圆型背景
 * @param colorStr 色值字符串，如：#ffdd00
 */
fun getCircleBg(colorStr: String) = getCircleBg(Color.parseColor(colorStr))

2.用xml画带边框的圆

• 效果图
  
• 用xml的shape实现

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="#FFF68F" />
    <stroke
        android:width="1dp"
        android:color="#FFFFFF" />
    <size
        android:width="20dp"
        android:height="20dp" />
</shape>

• 用代码实现
  如果要画空心圆,就不要调用“setColor”方法

private fun getCircle() = GradientDrawable().also {
    it.shape = GradientDrawable.OVAL
    val strokeWidth = 4 // 边框宽度
    val strokeColor = Color.parseColor("#FFFFFF") //边框颜色
    it.setStroke(strokeWidth, strokeColor)
    it.setColor(Color.parseColor("#FFF68F")) 
}