When i click on a listview item, the app crashes, instead of opening up another activity

manpreet Best Answer 2 years ago

I have MainActivity.Java that has a button. When the button is clicked, it opens the GradeListActivity.java which shows a ListView(I am using Fragment here). When I click on a ListView Item, my app crashes. Any help or guidance would be much appreciated. Thank You :)

My MainActivity.Java:

public class MainActivity extends Activity 
{
    public GradeCollection gc;  
    RatingBar GradeRatingBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GradeRatingBar = (RatingBar) findViewById(R.id.ratingBar);

        gc = new GradeCollection();
        GradeData gd = new GradeData("Exam", 1, 85, "First Exam");
        GradeData gd15 = new GradeData("Exam", 2, 94, "Second Exam");
        GradeData gd2 = new GradeData("Homework", 1, 100, "Schedule");
        GradeData gd3 = new GradeData("Homework", 2, 100, "Hello goodbye");
        GradeData gd4= new GradeData("Quiz", 1, 0, "Syllabus");
        GradeData gd5 = new GradeData("Quiz", 2, 80, "Chapter 1");
        GradeData gd6 = new GradeData("Quiz", 3, 60, "Chapter 4");
        GradeData gd7 = new GradeData("Lab", 1, 100, "Hello yankees");
        GradeData gd8 = new GradeData("Lab", 2, 100, "Manifest and Different Screens");
        GradeData gd9 = new GradeData("Lab", 3, 100, "Internalization");
        GradeData gd10 = new GradeData("Lab", 4, 100, "Layout and Controls");
        GradeData gd11 = new GradeData("Lab", 5, 100, "Easy Fragment");
        GradeData gd12 = new GradeData("Lab", 6
                                                

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