MazePanel mazePanel;
    MazePanel mazePanel2;
    Bitmap bmap;
    Paint paint;
    Maze maze;
    FirstPersonDrawer drawer;


    public GameView(Context context) {
        super(context);
        paint = new Paint();
        paint.setStyle(Paint.Style.FILL);
        mazePanel = new MazePanel(context.getApplicationContext());
        mazePanel.initBmap();
        bmap = mazePanel.getBitmap();
        mazePanel2 = new MazePanel(context.getApplicationContext());
        mazePanel2.setBitmap(bmap);

   @Override
   protected void onDraw(Canvas canvas) {
        mazePanel2.setPaintColor(Color.RED);
        mazePanel2.fillGraphicsRect(100, 100, 200, 300);
        canvas.drawBitmap(bmap, 0, 0, paint);
}

public GameView(Context context) {
        super(context);
        paint = new Paint();
        paint.setStyle(Paint.Style.FILL);
        mazePanel = new MazePanel(context.getApplicationContext());
        mazePanel2 = new MazePanel(context.getApplicationContext());
        mazePanel2.initBmap();
    }

    @Override
    protected void onDraw(Canvas canvas) {
            mazePanel2.setPaintColor(Color.RED);
            mazePanel2.fillGraphicsRect(100, 100, 200, 300);
            mazePanel.setBitmap(mazePanel2.getBitmap());
            bmap = mazePanel.getBitmap();
            canvas.drawBitmap(bmap, 0, 0, paint);
    }

public class MazePanel extends View {

    private Bitmap bmap;
    private Canvas canvas;
    private Paint paint;
    private Path polyPath;

    private DisplayMetrics metrics;

    private int viewWidth;
    private int viewHeight;

    public enum Colors {
        BLACK, GRAY, DARK_GRAY, WHITE, YELLOW, RED
    };

    public MazePanel(Context context) {
        super(context);
        metrics = context.getResources().getDisplayMetrics();
        viewWidth = metrics.widthPixels;
        viewHeight = metrics.heightPixels;
        canvas = new Canvas();
        paint = new Paint();
        polyPath = new Path();
    }

    public void initBmap() {
        bmap = Bitmap.createBitmap(viewWidth, viewHeight, Config.RGB_565);
        this.canvas = new Canvas(bmap);
    }

    public Canvas getCanvas() {
        return canvas;
    }

    public void setCanvas(Canvas canvas) {
        this.canvas = canvas;
    }

    public void setGraphicsColor(Colors colors) {
        switch(colors) {
        case BLACK:
            paint.setColor(Color.BLACK);
            break;
        case GRAY:
            paint.setColor(Color.GRAY);
            break;
        case DARK_GRAY:
            paint.setColor(Color.DKGRAY);
            break;
        case WHITE:
            paint.setColor(Color.WHITE);
            break;
        case YELLOW:
            paint.setColor(Color.YELLOW);
            break;
        case RED:
            paint.setColor(Color.RED);
            break;
        default:
            break;
        };
    }



    public Bitmap getBitmap() {
         return bmap;
    }

    public void setBitmap(Bitmap bitmap) {
         bmap = bitmap;
     }