测试运行完毕后生成Android JUnit测试用例的结果

I have an Android JUnit test case that uses Robotium to automate the entire functional flow of my android app. However, what i want is, once the test has finished running, I need to write the results to a text file, preferably to an excel sheet, where it writes a "Pass" or "Fail" against the different test cases mentioned.I have an Android JUnit test case that uses Rob