Not able to write the image to file

[chetan deol]

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Canvas canvas = null;
RelativeLayout relativeView = new RelativeLayout(this);
TextView textView = new TextView(Relative.this);
ImageView imageView = new ImageView(Relative.this);
imageView.setBackgroundResource(R.drawable.icon);
textView.setText("Hi this is chetan from android!!!");
relativeView.addView(textView);
relativeView.addView(imageView);
Bitmap returnedBitmap = Bitmap.createBitmap(200, 200,Bitmap.Config.ARGB_8888);
canvas = new Canvas(returnedBitmap);
imageView.setImageBitmap(returnedBitmap);
relativeView.draw(canvas);
setContentView(relativeView);
File root = Environment.getExternalStorageDirectory();
File file = new File(root,"androidlife.jpg");
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
if (fos != null) {
returnedBitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos);
fos.close();
}
} catch (Exception e) {
e.printStackTrace();
}
setContentView(relativeView);

Not able to write the image to file getting blank image.