How to Use Canvas API in Android Apps?

import android.annotation.SuppressLint;

import android.app.Activity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.util.DisplayMetrics;

import android.view.View;

  

public class PaintView extends View {

      

    

    Paint otherPaint, outerPaint, textPaint;

     

    

    float arcLeft;

  

    @SuppressLint("ResourceAsColor")

    public PaintView(Context context) {

        super(context);

          

        

        textPaint = new Paint(Paint.LINEAR_TEXT_FLAG | Paint.ANTI_ALIAS_FLAG);

          

        

        textPaint.setColor(Color.WHITE);

         

        

        

        

        textPaint.setTextSize(pxFromDp(context, 24));

          

        

        outerPaint = new Paint();

          

        

        outerPaint.setStyle(Paint.Style.FILL);

          

        

        outerPaint.setColor(getResources().getColor(R.color.purple_200));

          

        

        DisplayMetrics displayMetrics = new DisplayMetrics();

          

        

        ((Activity) getContext()).getWindowManager()

                .getDefaultDisplay()

                .getMetrics(displayMetrics);

          

        

        

        arcLeft = pxFromDp(context, 20);

          

        

        

        otherPaint = new Paint();

    }

  

    

    public static float pxFromDp(final Context context, final float dp) {

        return dp * context.getResources().getDisplayMetrics().density;

    }

  

    @Override

    protected void onDraw(Canvas canvas) {

        super.onDraw(canvas);

          

        

        

        canvas.drawPaint(outerPaint);

          

        

        otherPaint.setColor(Color.WHITE);

          

        

        otherPaint.setStyle(Paint.Style.FILL);

          

        

        

        canvas.drawRect(

                getLeft() + (getRight() - getLeft()) / 3,

                getTop() + (getBottom() - getTop()) / 3,

                getRight() - (getRight() - getLeft()) / 3,

                getBottom() - (getBottom() - getTop()) / 3, otherPaint);

          

        

        otherPaint.setColor(getResources().getColor(R.color.purple_200));

          

        

        

        canvas.drawCircle(getWidth() / 2, getHeight() / 2, arcLeft, otherPaint);

          

        

        canvas.drawText("Geeks for Geeks", (float) (getWidth() * 0.3), (float) (getHeight() * 0.8), textPaint);

    }

}

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