TestView.kt
import android.content.Context
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.util.AttributeSet
import android.view.View
class TestView(
context: Context,
attributeSet: AttributeSet
) : View(context, attributeSet) {
private val paint = Paint()
private val paintC = Paint()
init {
paint.style = Paint.Style.STROKE
paint.color = Color.GRAY
paint.strokeWidth = 5f
paintC.style = Paint.Style.FILL
paintC.color = Color.RED
}
override fun onDraw(canvas: Canvas) {
super.onDraw(canvas)
canvas.drawCircle((width / 2).toFloat(),
(height / 2).toFloat(),
100f, paintC)
canvas.drawRect(0f, 0f, width.toFloat(), height.toFloat(), paint)
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.neco_desarrollo.customviewlesson.TestView
android:layout_width="200dp"
android:layout_height="200dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>