先上代码吧：
class MyCustomView @JvmOverloads constructor(context: Context?, attrs: AttributeSet? = null, defStyleAttr: Int = 0):View(context, attrs, defStyleAttr) {
var text = ""
var textPlaint = TextPaint()
var size = 50f
var textColor = Color.BLACK
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec)
val size = 100 * context.resources.displayMetrics.density.toInt()
setMeasuredDimension(
max(suggestedMinimumWidth, resolveSize(size,widthMeasureSpec)),
max(suggestedMinimumHeight, resolveSize(size,heightMeasureSpec))
)
}
@RequiresApi(Build.VERSION_CODES.M)
override fun onDraw(canvas: Canvas?) {
textPlaint.apply {
this.textSize = size
this.color = textColor
}
val layout = StaticLayout.Builder.obtain(text,0,text.length,textPlaint,textPlaint.measureText(text).toInt()).build()
layout.draw(canvas)
}
}
在activity中设置文字：
findViewById<MyCustomView>(R.id.myCustomView).text = "第一行字\n第二行字"
代码的实现其实很简单，就是让StaticLayout去解释文字中的换行符"\n"。核心就以下这两句：
val layout = StaticLayout.Builder.obtain(text,0,text.length,textPlaint,textPlaint.measureText(text).toInt()).build()
layout.draw(canvas)
效果如下：
Screenshot_1656950107.png
