Android : Capture Screen image in android on canvas not working

I want to capture image of hole screen.I my application i have a view where user can draw some lines and rectangle on it and after that on a button click event i want to capture hole screen including drawing content but when i try then image is captured but it contain only xml design and not what i draw on canvas. I have a class class DrawingSurface extends SurfaceView implements SurfaceHolder.Callback in which i have code for drawing.

inside my fragment i have added this view to my frame layout-

mLayout = (RelativeLayout) view.findViewById(R.id.center_view);

drawingSurface = new DrawingSurface(mContext,conner1,conner2,conner3,conner4,myJob,mLayout); frame = (FrameLayout) view.findViewById(R.id.surface); frame.addView(drawingSurface);

and code for capture screen is -

private static OnClickListener SaveListener = new OnClickListener() {
    @Override
    public void onClick(View v) {
    /////   DrawingSurface dc = new DrawingSurface(mContext);
    //  dc.createFile();
            mLayout.getRootView();
            mLayout.setDrawingCacheEnabled(true);
            mLayout.buildDrawingCache(true);
            mLayout.post(new Runnable() {

                @Override
                public void run() {
                      Bitmap bitmap = mLayout.getDrawingCache();
                      Bitmap myBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), (int)(bitmap.getHeight()/1.0));
                      mLayout.setDrawingCacheEnabled(false);
                      try {
                        saveImage(myBitmap);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            });
    }
};

and below is screen shot that is captured by code -

and only xml view is captured and not what i have draw on it.How to do that.

Thanks in advance.