如何从第二个活动中获取领域信息? [英] How to get the realm information from an second activity?
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问题描述
我从主要活动中获得了schoolID,该活动基于json文件中的领域.我正在使用学校ID来获取学生的姓名.
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.
我的问题是如何获取学生姓名以及如何从学生适配器中列出学生.谢谢.
My question is how to get the students name and how to list the students from the student adapter. Thanks.
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;
}
}
推荐答案
您可以在XML文件中使用字符串数组.
You Can use string array in XML file .
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