В режиме прокрутки Переключатель списка просмотра автоматически меняет свое состояние, а некоторые из них ранее проверяются в android

Question

в моем представлении пользовательского списка, когда я запускаю приложение, а затем переключатели внизу уже проверяются, когда я проверяю верхнюю радио кнопку .how я могу установить переключатель, чтобы его состояние никогда не менялось в списке прокрутки.

Вот мой код studentlist.java

public class studentlist extends AppCompatActivity { 


    private static final String TAG_RESULTS="result"; 
    private static final String TAG_ID = "id"; 
    private static final String TAG_ClassDet = "classdetails"; 
    private static final String TAG_YEAR = "yearof"; 
    private static final String TAG_BRANCH ="branchof"; 
    private static final String TAG_SECTION ="sectionof"; 

    private static String KEY_SUCCESS = "success"; 
    private static String KEY_ERROR = "error"; 


    private ArrayList<HashMap<String, String>> studentattendence,studentstatus; 
    ListView listView; 
    ArrayAdapter<Model> adapter; 
    List<Model> list = new ArrayList<Model>(); 
    public ArrayList<HashMap<String, String>> personList; 
    private static final String KEY_STUDENT = "student"; 
    private RadioGroup radioGroup; 
    private RadioButton radiobtn; 
public Button ok; 
    private RadioButton radioButton; 
    HashMap<String, String> contact,contactstatus; 
    private String convertjson; 
    private String statusofattendence; 


    public void onCreate(Bundle icicle) { 
     super.onCreate(icicle); 
     setContentView(R.layout.liststudent); 




     listView = (ListView) findViewById(R.id.my_list); 
studentattendence=new ArrayList<HashMap<String, String>>(); 
studentstatus=new ArrayList<HashMap<String, String>>(); 
     personList = new ArrayList<HashMap<String, String>>(); 
     Intent getstud = getIntent(); 
     personList = (ArrayList<HashMap<String, String>>) getstud.getSerializableExtra(KEY_STUDENT); 
ok= (Button) findViewById(R.id.ok); 

    Toast.makeText(getApplicationContext(), pioGroup.ersonList.get(0).get("enrolment") + "" + personList.get(1).get("enrolment") + "" + personList.get(2).get("enrolment"), Toast.LENGTH_LONG).show(); 


     adapter = new MyAdapter(this, getModel(personList)); 
     listView.setAdapter(adapter); 

     radioGroup = (RadioGroup) findViewById(R.id.radio); 
          listView.childDrawableStateChanged(radioGroup); 






     ////ok button click get status of each radio button and store in hashmap 
     ok.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       int child=listView.getChildCount(); 
       ArrayList<String> radio=new ArrayList<>(); 
       View[] vy = new View[1]; 

       Log.d("child", String.valueOf(child)); 
for(int i=0;i<child;i++) { 
// RadioGroup rd = (RadioGroup) listView.getChildAt(i); 


    View rgg=listView.getChildAt(i); 
    Log.d("radioview",String.valueOf(rgg)); 
    radioGroup = (RadioGroup) rgg.findViewById(R.id.radio); 
    Log.d("radiogroup", String.valueOf(radioGroup)); 
    int selectedId=radioGroup.getCheckedRadioButtonId(); 

    radioButton = (RadioButton) rgg.findViewById(selectedId); 
    TextView tv= (TextView) rgg.findViewById(R.id.label); 
    Log.d("radiobutton and id", selectedId + "" + radioButton); 

String status= radioButton.getText().toString(); 
    Log.d("hello",status); 

    String enrol=tv.getText().toString(); 
    contact = new HashMap<String, String>(); 
    contact.put("enrollmentnum",enrol); 
    Log.d("enum",enrol); 
    studentattendence.add(contact); 
contactstatus = new HashMap<String, String>(); 
    contactstatus.put("status",status); 
    Log.d("ststuss",status); 
    studentstatus.add(contactstatus); 

} 

///here converting arraylist in to json string 
       convertjson = new Gson().toJson(studentattendence); 
       statusofattendence=new Gson().toJson(studentstatus); 
    Toast.makeText(getApplicationContext(),""+convertjson+""+statusofattendence,Toast.LENGTH_LONG).show(); 
       NetAsync(v, convertjson,statusofattendence); 
      } 
     }); 

    } 


    private List<Model> getModel(ArrayList<HashMap<String, String>> personList) { 
     for (int i = 0; i < personList.size(); i++) { 
      String enrolment = personList.get(i).get("enrolment"); 
      list.add(new Model(enrolment)); 

     } 

     return list; 
    } 
    ////now we will send taked attendence to webservice 
    private class NetCheck extends AsyncTask<String,String,Boolean> 
    { 
public final String convertjson,statusofattendence; 
     private ProgressDialog nDialog; 

     public NetCheck(String convertjson,String statusofattendence) { 
      this.convertjson=convertjson; 
      this.statusofattendence=statusofattendence; 
     } 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      nDialog = new ProgressDialog(studentlist.this); 
      nDialog.setMessage("Loading.."); 
      nDialog.setTitle("Checking Network"); 
      nDialog.setIndeterminate(false); 
      nDialog.setCancelable(true); 
      nDialog.show(); 
     } 

     @Override 
     protected Boolean doInBackground(String... args) { 



/** 
* Gets current device state and checks for working internet connection by trying Google. 
**/ 
      /* 
      ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
      NetworkInfo netInfo = cm.getActiveNetworkInfo(); 
      if (netInfo != null && netInfo.isConnected()) { 
       try { 
        URL url = new URL("http://www.google.com"); 
        HttpURLConnection urlc = (HttpURLConnection) url.openConnection(); 
        urlc.setConnectTimeout(3000); 
        urlc.connect(); 
        if (urlc.getResponseCode() == 200) { 
         return true; 
        } 
       } catch (MalformedURLException e1) { 
        // TODO Auto-generated catch block 
        e1.printStackTrace(); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      }*/ 
      // return false; 
      return true; 
     } 

     @Override 
     protected void onPostExecute(Boolean th) { 

      if (th == true) { 
       nDialog.dismiss(); 
       new ProcessRegister().execute(); 
      } else { 
       nDialog.dismiss(); 

      } 
     } 
    } 

    private class ProcessRegister extends AsyncTask<String, String, JSONObject> { 


     private ProgressDialog pDialog; 

     String forgotpassword; 
     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 

      pDialog = new ProgressDialog(studentlist.this); 
      pDialog.setTitle("Contacting Servers"); 
      pDialog.setMessage("Getting Data ..."); 
      pDialog.setIndeterminate(false); 
      pDialog.setCancelable(true); 
      pDialog.show(); 
     } 

     @Override 
     protected JSONObject doInBackground(String... args) { 

TeacherFunctions userFunction = new TeacherFunctions(); 
      Log.d("convertjson",convertjson); 
         Log.d("convertjson",statusofattendence); 
      JSONObject json = userFunction.addAttendence(convertjson,statusofattendence); 

      return json; 
     } 


     @Override 
     protected void onPostExecute(JSONObject json) { 
      /** 
      * Checks if the Password Change Process is sucesss 
      **/ 
      try { 
       if (json.getString(KEY_SUCCESS) != null) { 

        String res = json.getString(KEY_SUCCESS); 
        String red = json.getString(KEY_ERROR); 


        if(Integer.parseInt(res) == 1){ 
         pDialog.dismiss(); 

         Toast.makeText(getApplicationContext(),"students Attendence Uploaded successfully"+json.getString("user"),Toast.LENGTH_LONG).show(); 


        } 
        else if (Integer.parseInt(red) == 2) 
        { pDialog.dismiss(); 
        } 
        else { 
         pDialog.dismiss(); 

        } 




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

       pDialog.dismiss(); 

       Toast.makeText(getApplicationContext()," not Uploaded successfully"+e,Toast.LENGTH_LONG).show(); 

      } 
     }} 
    public void NetAsync(View view, String convertjson,String statusofattendence){ 
     new NetCheck(convertjson,statusofattendence).execute(); 
    } 
} 

Код для model.java

public class Model { 

    private String name; 
    private boolean selected; 

    public Model(String name) { 
     this.name = name; 
    } 

    public String getName() { 
     return name; 
    } 

    public boolean isSelected() { 
     return selected; 
    } 

    public void setSelected(boolean selected) { 
     this.selected = selected; 
    } 
} 

код для MyAdapter.java

public class MyAdapter extends ArrayAdapter<Model> { 

    private final List<Model> list; 
    private final Activity context; 
    boolean checkAll_flag = false; 
    boolean checkItem_flag = false; 

    public MyAdapter(Activity context, List<Model> list) { 
     super(context, R.layout.row, list); 
     this.context = context; 
     this.list = list; 
    } 

    static class ViewHolder { 
     protected TextView text; 
     protected RadioButton radiobox; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 

     ViewHolder viewHolder = null; 
     if (convertView == null) { 
      LayoutInflater inflator = context.getLayoutInflater(); 
      convertView = inflator.inflate(R.layout.row, null); 
      viewHolder = new ViewHolder(); 
      viewHolder.text = (TextView) convertView.findViewById(R.id.label); 
      viewHolder.radiobox = (RadioButton) convertView.findViewById(R.id.radio1); 
      viewHolder.radiobox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 

       @Override 
       public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
        int getPosition = (Integer) buttonView.getTag(); // Here we get the position that we have set for the checkbox using setTag. 
        list.get(getPosition).setSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state. 
       } 
      }); 
      convertView.setTag(viewHolder); 
      convertView.setTag(R.id.label, viewHolder.text); 
      convertView.setTag(R.id.radio1, viewHolder.radiobox); 
      } else { 
      viewHolder = (ViewHolder) convertView.getTag(); 
     } 
     viewHolder.radiobox.setTag(position); // This line is important. 

     viewHolder.text.setText(list.get(position).getName()); 
     viewHolder.radiobox.setChecked(list.get(position).isSelected()); 

     return convertView; 
    } 
} 

Answer 1

На самом деле все не работает должным образом, а затем я перешел к списку с помощью 4-х кнопок вместо переключателя.

Answer 2

Вы используете setOnCheckedChangeListener() на viewHolder.radiobox. это очень плохой код для этого, потому что каждый раз convertView получает null до view, затем setOnCheckedChangeListener() также называется. И он установит ваши модальные данные в следующую позицию. Если вы хотите его проверить, просто введите Log в onCheckedChange или попробуйте установить в нем контрольную точку. просто попробуйте следующее:

@Override 
    public View getView(int position, View convertView, ViewGroup parent) { 

     ViewHolder viewHolder = null; 
     if (convertView == null) { 
      LayoutInflater inflator = context.getLayoutInflater(); 
      convertView = inflator.inflate(R.layout.row, null); 
      viewHolder = new ViewHolder(); 
      viewHolder.text = (TextView) convertView.findViewById(R.id.label); 
      viewHolder.radiobox = (RadioButton) convertView.findViewById(R.id.radio1); 

      convertView.setTag(viewHolder); 
      convertView.setTag(R.id.label, viewHolder.text); 
      convertView.setTag(R.id.radio1, viewHolder.radiobox); 
      } else { 
      viewHolder = (ViewHolder) convertView.getTag(); 
     } 

viewHolder.radiobox.setOnClickListener(new View.OnClickListener() { 

       @Override 
       public void onClick(View v) 
{ 
    if(viewHolder.radiobox.isChecked()) 
{ 
viewHolder.radiobox.setChecked(false); 
} 
else 
{ 
viewHolder.radiobox.setChecked(true); 
}    
        list.get(getPosition).setChecked(viewHolder.radiobox.isChecked()); // Set the value of checkbox to maintain its state. 
       } 
      }); 

     viewHolder.text.setText(list.get(position).getName()); 
     viewHolder.radiobox.setChecked(list.get(position).isChecked()); 

     return convertView; 
    } 

надеюсь, что это вам поможет.

Answer 3

enter code here 
getListView().setOnScrollListener(this);*** 

enter code here 

public void onScroll(AbsListView view, int firstCell, int cellCount, int itemCount) { 

    RadioButton rb1 = (RadioButton) findViewById(R.id.option1); 
rb1.setChecked(flase); 
} 

public void onScrollStateChanged(AbsListView view, int scrollState) {   
}