Create a file with a filename containg current date

createTempImageFile.java

static File createTempImageFile(Context context) throws IOException {
	String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
			Locale.getDefault()).format(new Date());
	String imageFileName = "JPEG_" + timeStamp + "_";
	File storageDir = context.getExternalCacheDir();

	return File.createTempFile(
			imageFileName,  /* prefix */
			".jpg",         /* suffix */
			storageDir      /* directory */
	);
}