Rotating spinner arrow in android by 180 - android-layout

Question

Issue:
I needed to implement Spinner for RTL languages such that text is aligned to right and down arrow towards left.I am able to acheive this alignment but the arrow is pointing upwards.
I do not want to use setRotation since it's available only from API level 11.
PFB the code I am using:
//Creating spinner
Spinner s=new RTLSpinner(this);
List<String> list = new ArrayList<String>();
list.add("list 1");
list.add("list 2");
list.add("list 3");
ArrayAdapter<String> dataAdapter = new CustomAdapter(this, android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s.setAdapter(dataAdapter);
//Fetching the background drawable of Spinner
NinePatchDrawable drawable=(NinePatchDrawable)(((StateListDrawable)s.getBackground()).getCurrent());
//Converting it into Bitmap
Bitmap bmpOriginal = Bitmap
.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bmpOriginal);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight());
drawable.draw(canvas);
//Rotating the image
Bitmap bmResult = Bitmap.createBitmap(bmpOriginal.getWidth(), bmpOriginal.getHeight(), Bitmap.Config.ARGB_8888);
Canvas tempCanvas = new Canvas(bmResult);
tempCanvas.rotate(180, bmpOriginal.getWidth()/2, bmpOriginal.getHeight()/2);
tempCanvas.drawBitmap(bmpOriginal, 0, 0, null);
s.setBackgroundDrawable(new BitmapDrawable(bmResult));
class CustomAdapter extends ArrayAdapter<String> {
public CustomAdapter(Context context, int textViewResourceId,
List<String> textArray) {
super(context, textViewResourceId, textArray);
}
public TextView getView(int position, View convertView, ViewGroup parent) {
TextView viewObj = (TextView) super.getView(position, convertView,
parent);
TextView optionView = (TextView) viewObj
.findViewById(android.R.id.text1);
optionView.setGravity(Gravity.RIGHT | Gravity.CENTER_VERTICAL);
return viewObj;
}
}
Thanks in Advance!