How to draw a circle in android Canvas

In this android programming source code example, we are going to draw a circle in android Canvas.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to draw a circle in android Canvas.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/relativeLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <view class="com.bluapp.androidview2.Canvas.CanvasActivity3$canvas3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;

public class CanvasActivity3 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_canvas3);
    }

    public static class canvas3 extends View {
        private Paint paint;
        private int radius;
        public canvas3(Context context, AttributeSet attributeSet){
            super(context, attributeSet);
            radius = 100;
            paint = new Paint();
            paint.setColor(getResources().getColor(R.color.colorAccent));
            paint.setStrokeWidth(10);
            paint.setStyle(Paint.Style.STROKE);
        }

        @Override
        protected void onDraw(Canvas canvas){
            super.onDraw(canvas);
            canvas.drawCircle(200, 200, radius, paint);
        }
    }
}

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