Question

我从主要活动获得了schoolID，它基于json文件中的域。使用学校ID我试图得到学生的名字。

我的问题是如何获取学生姓名以及如何从学生适配器列出学生。谢谢。

以下是学生活动：

@Override
public void onResume() {
    super.onResume();

    Bundle extras = getIntent().getExtras();

    if (extras != null) {

        String schoolName = extras.getString("schoolName");


        RealmResults<School> schools = realm.where(School.class).findAll();

        //RealmResults<School> school =  realmStudent.where(School.class).equalTo("SchoolName", schoolName).findAll();
        // Log.d(tag, String.valueOf(school));
    }
}

以下是学校班级：

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

以下是主要活动：

@Override
public void onResume(){

    super.onResume();

    if(mAdapter == null) {
        List<School> schools = null;
        try {
            schools = loadSchools();

        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    RealmResults<School> schools = realm.where(School.class).findAll();
    final SchoolAdapter adapter = new SchoolAdapter(this, R.id.schools_list, schools, true);
    ListView listView = (ListView) findViewById(R.id.schools_list);
    listView.setAdapter(adapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {


        public void onItemClick(AdapterView<?> adapterView, View view,
                                int position, long id) {

         String schoolName  = adapter.getRealmResults().get(position).getSchoolName();

            startStudentList(schoolName);

        }
    });
}

@Override
protected void onDestroy() {
    super.onDestroy();
    realm.close();
}

public void startStudentList(String schoolName){

    //String schoolName = school.getSchoolName();

    Intent schoolIntent = new Intent(this, StudentActivity.class);

    schoolIntent.putExtra("schoolName", schoolName);
   // Log.d(tag, String.valueOf(schoolName));

    startActivity(schoolIntent);


}

public List<School> loadSchools() throws IOException{

    loadJsonFromStream();

    return realm.allObjects(School.class);

}

private void loadJsonFromStream() throws IOException {

    InputStream stream = getAssets().open("school.json");

    realm.beginTransaction();
    try {
        realm.createAllFromJson(School.class, stream);
        realm.commitTransaction();
    } catch (IOException e) {

        realm.cancelTransaction();
    } finally {
        if (stream != null) {
            stream.close();


        }
    }

}

以下是学校适配器：

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;
}

}

Answer 1

您可以在XML文件中使用字符串数组。

如何从第二个活动中获取领域信息？

1 个答案: