Dibujar Bitmap en Android

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

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

        ImageView imageView =  ((ImageView)findViewById(R.id.imageView));

        /**
         * creación de imagen
         * */

        //dimensiones de la imagen
        final int ancho = 400;
        final int alto = 400;

        //se define el mapa de bits
        Bitmap bitmap = Bitmap.createBitmap(ancho, alto, Bitmap.Config.ARGB_8888);
        //se define el lienzo
        Canvas canvas = new Canvas(bitmap);
        //estilos
        Paint paint = new Paint();
        paint.setColor(Color.parseColor("#ff950b"));
        canvas.drawPaint(paint);

        //Figura geometria
        paint.setColor(Color.parseColor("#DF3A01"));
        canvas.drawCircle(200, 200, 200, paint);

        //lineas
        paint.setColor(Color.parseColor("#ffffff"));
        paint.setStrokeWidth(6);
        canvas.drawLine(200, 0, 200, 400, paint);
        canvas.drawLine(0, 200, 400, 200, paint);

        //path
        paint.setColor(Color.parseColor("#ffff07"));
        paint.setStrokeWidth(2);
        Path path = new Path();
        path.moveTo(200, 30);
        path.lineTo(250, 120);
        path.lineTo(150, 120);
        canvas.drawPath(path, paint);

        //pintando imagen desde la carpeta de recursos
        Resources res = getResources();
        Bitmap icon = BitmapFactory.decodeResource(res, R.mipmap.ic_launcher);
        canvas.drawBitmap( icon, (ancho / 2) - (icon.getWidth() / 2.f), (alto / 2.f) - (icon.getHeight()/2.f), paint);

        //pintando texto
        paint.setAntiAlias(true);
        paint.setTextSize(54.f);
        paint.setTextAlign(Paint.Align.CENTER);
        paint.setColor(Color.parseColor("#0B0B61"));
        canvas.drawText("JC MOUSE", ancho / 2.f, (alto / 2.f) + 120, paint);

        //agrega el bitmap al ImageView
        imageView.setImageBitmap(bitmap);

    }
}