@Override
protected void onDraw(Canvas canvas) {
    if(z==true) {
       *
      }
      else
    switch (pick) {

        case 1:
            drawPaint.setStyle(Paint.Style.STROKE);
            canvas.drawBitmap(canvasBitmap, 0, 0, drawPaint);
            drawCanvas.drawCircle(x,y,brushSize,drawPaint);
            break;
        case 2:
            drawPaint.setStyle(Paint.Style.STROKE);
            canvas.drawBitmap(canvasBitmap, 0, 0, drawPaint);
            drawCanvas.drawLine(x, y, brushSize, brushSize, drawPaint);
            break;
        case 3:
            drawPaint.setStyle(Paint.Style.STROKE);
            canvas.drawBitmap(canvasBitmap, 0, 0, drawPaint);
            drawCanvas.drawRect(x,brushSize,y,brushSize,drawPaint);
            break;
        default:
            drawPaint.setStyle(Paint.Style.STROKE);
            canvas.drawBitmap(canvasBitmap, 0, 0, drawPaint);
            canvas.drawPath(drawPath,drawPaint);




    }

}