修改NetWorkinfo 可能为null的bug

lizhanwei

2020-03-08 7915395e0199f64fb108f70df18a8df0c08876fb

 app/src/main/java/safeluck/drive/evaluation/DB/exam_status/ExamStatusViewModel.java

@@ -38,4 +38,12 @@
    public LiveData<Integer> getStartExam() {
        return startExam;
    }

    @Override
    public String toString() {
        return "ExamStatusViewModel{" +
                ", examStatus=" + examStatus +
                ", startExam=" + startExam +
                '}';
    }
}