我正在为学生出勤创建一个应用程序，我从Server那里获取数据作为学生详细信息，现在我想获取入场时无线电当前（绿色）或不存在（红色）的值，我该怎么办。 对不起，我的英语
这是我要作为出勤详细信息发送回服务器的JSON格式
{
"Date": "",
"ClassRSN": "",
"SectionRSN": "",
"SessionRSN": "",
"Studentdetails": [
{
"AdmissionID": "",
"Attendance": ""
}
]}
我无法迭代每个值
recyclerView类
public class StudentDetailsAdapter extends RecyclerView.Adapter<StudentDetailsAdapter.ViewHolder> {
private Context context;
Integer attendance;
ArrayList<HashMap<String, String>> StudentDetailList;
public StudentDetailsAdapter(Context context, ArrayList<HashMap<String, String>> Studetails) {
this.context = context;
StudentDetailList = Studetails;
Log.e("MD", "" + Studetails);
}
@Override
public StudentDetailsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(context).inflate(R.layout.single_row_student_details, parent, false);
return new StudentDetailsAdapter.ViewHolder(itemView);
}
@Override
public void onBindViewHolder(StudentDetailsAdapter.ViewHolder holder, final int position) {
if (position % 2 == 1) {
holder.itemView.setBackgroundColor(Color.parseColor("#FFFFFF"));
} else {
holder.itemView.setBackgroundColor(Color.parseColor("#FFFAF8FD"));
}
holder.tvrollno.setText(StudentDetailList.get(position).get("stu_no"));
holder.tvname.setText(StudentDetailList.get(position).get("stu_name"));
if (holder.rdBtnPresent.isChecked()) {
attendance = 1;
} else {
attendance = 0;
}
try {
// Creating JSONObject from String
JSONObject jsonObjMain = new JSONObject(ConstantClass.myjsonstring);
Log.e("jsonObjMain", "jsonObjMain" + jsonObjMain);
jsonObjMain.put("Date", "30-11-2018");
jsonObjMain.put("ClassRSN", "1");
jsonObjMain.put("SectionRSN", "1");
jsonObjMain.put("SessionRSN", "13");
JSONArray quesans = new JSONArray(jsonObjMain.getString("Studentdetails"));
for (int i = 0; i < StudentDetailList.size(); i++) {
JSONObject studata = quesans.getJSONObject(i);
studata.put("AdmissionID", StudentDetailList.get(position).get("stu_no"));
studata.put("Attendance",StudentDetailList.get(position).attendance);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public int getItemCount() {
return StudentDetailList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView tvrollno, tvname;
RadioButton rdBtnPresent, rdBtnAbsent;
public ViewHolder(View itemView) {
super(itemView);
tvrollno = (TextView) itemView.findViewById(R.id.tv_rollno);
tvname = (TextView) itemView.findViewById(R.id.tv_name);
rdBtnPresent = (RadioButton) itemView.findViewById(R.id.attendance_present);
rdBtnAbsent = (RadioButton) itemView.findViewById(R.id.attendance_absent);
}
}}
MainActivity
public class Attendance extends AppCompatActivity {
ArrayList<HashMap<String, String>> StudentList = new ArrayList<>();
Calendar myCalendar1;
RecyclerView rdrecyclerView;
DatePickerDialog.OnDateSetListener date1;
EditText etAttDAte;
Spinner classpinner, sectionspinner;
List<SpinnerBean> block;
Button btnGo;
ArrayList<HashMap<String, String>> StudentDetailsList = new ArrayList<>();
LinearLayout LL_studeatils;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_class);
SetIDs();
SpinnerData();
InVokeDatePicker();
getSystemDate();
}
public void InVokeDatePicker() {
myCalendar1 = Calendar.getInstance();
date1 = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// TODO Auto-generated method stub
myCalendar1.set(Calendar.YEAR, year);
myCalendar1.set(Calendar.MONTH, monthOfYear);
myCalendar1.set(Calendar.DAY_OF_MONTH, dayOfMonth);
updateLabel1();
}
};
etAttDAte.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new DatePickerDialog(Attendance.this, date1, myCalendar1
.get(Calendar.YEAR), myCalendar1.get(Calendar.MONTH),
myCalendar1.get(Calendar.DAY_OF_MONTH)).show();
}
});
}
private void updateLabel1() {
String myFormat = "dd/MM/yyyy"; //In which you need put here
SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US);
etAttDAte.setText(sdf.format(myCalendar1.getTime()));
}
public void getSystemDate() {
Date c = Calendar.getInstance().getTime();
System.out.println("Current time => " + c);
SimpleDateFormat df = new SimpleDateFormat("dd-MMM-yyyy");
String formattedDate = df.format(c);
etAttDAte.setText(formattedDate);
}
public void SpinnerData() {
final List<SpinnerBean> dist = UtilityClass.getAllDistrict(Attendance.this);
classpinner.setAdapter(new StateListAdapter(Attendance.this, dist));
classpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
SpinnerBean bean = (SpinnerBean) adapterView.getItemAtPosition(i);
//Toast.makeText(getApplicationContext(), dist.get(i).getId(), Toast.LENGTH_LONG).show();
ConstantClass.GetClass = dist.get(i).getId();
block = UtilityClass.getDistricWiseBlock(Attendance.this, dist.get(i).getId());
sectionspinner.setAdapter(new StateListAdapter(Attendance.this, block));
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
// DO Nothing here
}
});
sectionspinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
SpinnerBean bean = (SpinnerBean) adapterView.getItemAtPosition(i);
// Toast.makeText(getApplicationContext(), block.get(i).getId(), Toast.LENGTH_LONG).show();
ConstantClass.GetSection = block.get(i).getId();
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
// DO Nothing here
}
});
}
public void SetIDs() {
rdrecyclerView = (RecyclerView) findViewById(R.id.recView);
etAttDAte = (EditText) findViewById(R.id.attendance_date);
classpinner = (Spinner) findViewById(R.id.spinner_class);
sectionspinner = (Spinner) findViewById(R.id.spinner_section);
btnGo = (Button) findViewById(R.id.btn_go);
LL_studeatils = (LinearLayout) findViewById(R.id.LL_studetailsView);
btnGo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
StudentDetailsList.clear();
LL_studeatils.setVisibility(View.VISIBLE);
new SendPostRequest().execute();
}
});
}
class SendPostRequest extends AsyncTask<String, Void, String> {
protected void onPreExecute() {
}
protected String doInBackground(String... arg0) {
try {
java.net.URL url = new URL("http://mindfacttech.com/api/SchoolERPAPITemp/BL/StudentManager.php"); // here is your URL path
Log.e("url", "" + url);
JSONObject postDataParams = new JSONObject();
postDataParams.put("ClassRSN", ConstantClass.GetClass);
postDataParams.put("SectionRSN", ConstantClass.GetSection);
postDataParams.put("studentlist", "yes");
Log.e("postDataParams", "" + postDataParams);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(15000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(getPostDataString(postDataParams));
writer.flush();
writer.close();
os.close();
int responseCode = conn.getResponseCode();
if (responseCode == HttpsURLConnection.HTTP_OK) {
BufferedReader in = new BufferedReader(new
InputStreamReader(
conn.getInputStream()));
StringBuffer sb = new StringBuffer("");
String line = "";
while ((line = in.readLine()) != null) {
sb.append(line);
break;
}
in.close();
return sb.toString();
} else {
return new String("false : " + responseCode);
}
} catch (Exception e) {
return new String("Exception: " + e.getMessage());
}
}
@Override
protected void onPostExecute(String result) {
Log.e("result", "" + result);
try {
JSONObject jo = new JSONObject(result);
Log.e("ConstantClass.resJSon", "" + jo);
JSONArray jsonArray = new JSONArray(jo.getString("Students"));
for (int i = 0; i < jsonArray.length(); i++) {
HashMap<String, String> reqedetails = new HashMap<>();
reqedetails.put("stu_no", jsonArray.getJSONObject(i).getString("AdmissionNo"));
reqedetails.put("stu_name", jsonArray.getJSONObject(i).getString("Name"));
String s1 = jsonArray.getJSONObject(i).getString("AdmissionNo");
Log.e("s1", "" + s1);
StudentDetailsList.add(reqedetails);
Log.e("StudentDetailsList.....", "" + StudentDetailsList);
}
rdrecyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL,
false));
rdrecyclerView.setItemAnimator(new DefaultItemAnimator());
rdrecyclerView.setAdapter(new StudentDetailsAdapter(getApplicationContext(), StudentDetailsList));
} catch (JSONException e) {
e.printStackTrace();
}
}
public String getPostDataString(JSONObject params) throws Exception {
StringBuilder result = new StringBuilder();
boolean first = true;
Iterator<String> itr = params.keys();
while (itr.hasNext()) {
String key = itr.next();
Object value = params.get(key);
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(key, "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(value.toString(), "UTF-8"));
}
return result.toString();
}
}
public void getjsondata() {
// Reading json file from assets folder
StringBuffer sb = new StringBuffer();
BufferedReader br = null;
try {
br = new BufferedReader(new InputStreamReader(getAssets().open(
"Student.json")));
String temp;
while ((temp = br.readLine()) != null)
sb.append(temp);
} catch (IOException e) {
e.printStackTrace();
} finally {
// br.close(); // stop reading
}
ConstantClass.myjsonstring = sb.toString();}}
答案 0 :(得分：0)
希望这会有所帮助。
在这里进行一些更改。
//make jsonarray called "Studentdetails" and put it into your main json object.
JSONArray quesans = new JSONArray(jsonObjMain.getString("Studentdetails")); // not requred
for (int i = 0; i < StudentDetailList.size(); i++) {
JSONObject studata = new JSONOject();
studata.put("AdmissionID", StudentDetailList.get(position).get("stu_no"));
studata.put("Attendance",StudentDetailList.get(position).attendance);
jsonObjMain.accumulate("Studentdetails" , studata); // add this
}
答案 1 :(得分：0)
您正在onBindView中制作Json对象？！ ，每次滚动都会向json数据添加/重写。我猜您的应用程式会落后。这样做使模型类具有带有getter和setter的所有学生属性。制作该模型类的arraylist。在recyclerview中显示它。用户标记出勤之后，只需使用适配器中的方法将阵列列表返回到包含recyclerview的活动即可。然后使用gson库从arraylist中为u创建json数据。