java - 如何在 Activity 中列出getView中的 Realm 列表？

Question

我可以按照以下代码使用适配器在我的主要 Activity 中打印学校名称。

我的问题是，如果我单击学校名称并想列出另一个学生 Activity 中的学生姓名，我该如何列出 RealmList<Student> Students 的学生姓名？ ，以及如何在学生适配器中指定学生的位置？

public class SchoolAdapter extends RealmBaseAdapter<School> implements ListAdapter {

    private static class ViewHolder {
        TextView school;
    }

    public SchoolAdapter(Context context, int resId, RealmResults<School> realmResults, boolean automaticUpdate) {
        super(context, realmResults, automaticUpdate);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        if (convertView == null) {
            convertView = inflater.inflate(android.R.layout.simple_list_item_1, parent, false);
            viewHolder = new ViewHolder();
            viewHolder.school = (TextView) convertView.findViewById(android.R.id.text1);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        School item = realmResults.get(position);
        viewHolder.school.setText(item.getSchoolName());
        return convertView;
    }

    public RealmResults<School> getRealmResults() {
        return realmResults;
    }
}

public class School extends RealmObject {

    @Required
    private String SchoolID;
    private String SchoolName;
    private RealmList<Student> Students;

    //...getters/setters
}


public class Student extends RealmObject {

    @Required
    private String StudentID;
    private String StudentName;

    //...getters/setters
}

Answer 1

1 - 你应该为你的学校 ListView 实现一个 OnItemClick 监听器:

listViewSchool.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int position, long l)
    {
        // Get the School Name from School Adapter

        String schoolName = ((School) adapterView.getItemAtPosition(position)).[GetSchoolName()]; 

        // Create intent to pass data and call another Activity.

        Intent intent = new Intent(activity, [YourStudentActivity].class);

        // Add data to intent

        intent.putExtra("schoolName", schoolName);

        // Call the Student Activity

        startActivity(intent);
    }
});

2 - 创建学生 Activity 时，您应该在 OnCreate() 中按学校名称过滤学生，并将他们显示在学生 ListView 中。要从 Intent 中获取值(value):

// OnCreate on Student Activity
@Override
protected void onCreate(Bundle savedInstanceState)
{
    ...
    Bundle extras = getIntent().getExtras();

    if (extras != null)
    {
        String schoolName = extras.getString("schoolName");
    }

    // Then filter the students by [schoolName] and then add the result to the student array used by the student adapter and then notify the student listview.

    ...
}

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Q:为什么需要在学生适配器中指定学生位置？