How to get the realm information from an second activity?

问题

I got the schoolID from the main activity, which is base on realm from a json file. Using the school ID I am trying to get the students name.

My question is how to get the students name and how to list the students from the student adapter. Thanks.

The following is the student activity:

@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));
    }
}

The following is the school class:

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

The following is the main activity:

@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();


        }
    }

}

The following is the school adapter:

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;
}

}

回答1:

You Can use string array in XML file .

来源：https://stackoverflow.com/questions/34329224/how-to-get-the-realm-information-from-an-second-activity