[android-beginners] a simple code to draw a circle

hi , I am a beginner in developing android applications . For
starters , I want to wrote a code just to display a coloured circle
onscreen. but the emulator says The specified activity does not
exist .
can anyone check this code for me and suggest changes ?

package com.bitmap.android;

import android.app.Activity;
import android.os.Bundle;
import android.widget.*;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;

public class BitmapAndroid extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        int x = 10;
        int y = 10;
        int r = 4;
        Paint mPaint = new Paint();
        mPaint.setColor(0xFF0000);
        Canvas mCanvas = new Canvas();
        mCanvas.drawCircle(x,y,r,mPaint);

    }


}


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