Sie können keine Werte aus Listviews EditText erhalten?

Question

Aug 26, 2016, 02:43 PM

baseadapter android-edittext android listview

Sie können keine Werte aus Listviews EditText erhalten?

Ich versuche, Daten von EditText abzurufen, der sich in meiner Listenansicht befindet. Ich sah viele ähnliche Fragen und bekam einLösun. Aber es gibt eine NPE in meiner Implementierung.

So führen Sie mich bitte, um dieses Problem zu beheben.

Adapte

public class Coscho_adapter extends BaseAdapter {

    Context con;
    ArrayList<HashMap<String, String>> list;
    LayoutInflater mInflater;
    EditText marks;
    TextView studname, acname;

    public Coscho_adapter(Context co, ArrayList<HashMap<String, String>> list1) {
        list = list1;
        con = co;
        mInflater = (LayoutInflater) con.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int arg0) {
        return null;
    }

    @Override
    public long getItemId(int arg0) {
        return 0;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if(convertView==null){
            holder = new ViewHolder();
            convertView = mInflater.inflate(R.layout.sc_item,null,false);
            holder.marks = (EditText) convertView.findViewById(R.id.marks);
            holder.studname = (TextView) convertView.findViewById(R.id.stu_name);
            holder.acname = (TextView) convertView.findViewById(R.id.act_name);
            convertView.setTag(holder);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }

        int sno = position + 1;
        holder.studname.setText(sno + ". " + list.get(position).get("DESCRIPTOR"));
        holder.acname.setVisibility(View.GONE);
        holder.marks.setText(list.get(position).get("STUDENT_MARK"), TextView.BufferType.EDITABLE);
        int maxLength = 1;
        holder.marks.setFilters(new InputFilter[] {new InputFilter.LengthFilter(maxLength), new InputFilterMinMax("0", "5")});
        desc_ids.add(list.get(position).get("DESCRIPTOR_ID"));

        return convertView;
    }

    class ViewHolder {
        EditText marks;
        TextView studname, acname;
    }
}

Onclick

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if(item.getItemId()==R.id.add)
    {
       View v;
        ArrayList<String> scho = new ArrayList<String>();
        EditText et;
        if (co_adapter.getCount() != 0) {
        for (int i = 0; i < co_adapter.getCount(); i++) {
            v = mListView.getChildAt(i);
            et = (EditText) v.findViewById(R.id.marks);
            if (et != null) {
                scho.add(et.getText().toString());
                Log.e("SCH", et.getText().toString());
            }
        }
    }
   }
    return super.onOptionsItemSelected(item);
}

UPDATE using TextWatcher

Jetzt kann ich den Wert des Edittext in einem Array speichern. Aber wenn die Listenansicht gescrollt wird. Die Werte werden in die Anfangswerte geändert.

 public class Coscho_adapter extends BaseAdapter {

            Context con;
            LayoutInflater mInflater;

            public Scholastic_adapter(Context context, ArrayList<HashMap<String, String>> list1) {
                sadap_list = list1;
                con = context;
                mInflater = LayoutInflater.from(context);
            }

            @Override
            public int getCount() {
                return sadap_list.size();
            }

            @Override
            public Object getItem(int position) {
                return null;
            }

            @Override
            public long getItemId(int position) {
                return position;
            }

            @Override
            public View getView(final int position, View convertView, ViewGroup parent) {
                ViewHolder holder;
                if(convertView==null){
                    holder = new ViewHolder();
                    convertView = mInflater.inflate(R.layout.sc_item,null,false);
                    holder.marks = (EditText) convertView.findViewById(R.id.marks);
                    holder.studname = (TextView) convertView.findViewById(R.id.stu_name);
                    holder.acname = (TextView) convertView.findViewById(R.id.act_name);
                    convertView.setTag(holder);
                }else{
                    holder = (ViewHolder) convertView.getTag();
                }

                for (int i = 0; i < arrScMarks.length; i++) {
                    Log.e("Array > ", i +"> "+ arrScMarks[i]);
                }

                int sno = position + 1;
                holder.ref = position;
                holder.studname.setText(sno + ". " + sadap_list.get(holder.ref).get("FIRST_NAME"));
                holder.acname.setText(sadap_list.get(holder.ref).get("ACTIVITY_NAME"));
                holder.marks.setText(arrScMarks[holder.ref]);
                holder.marks.addTextChangedListener(new GenericTextWatcher(holder.ref));


                return convertView;
            }

            class ViewHolder {
                EditText marks;
                TextView studname, acname;
                int ref;
            }
        }

TextWatcher

private class GenericTextWatcher implements TextWatcher{

        int position;

        private GenericTextWatcher(int pos) {
              this.position = pos;
        }

        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {}
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {}

        public void afterTextChanged(Editable editable) {
            String text = editable.toString();
            arrScMarks[position] = text;
            Log.e("Watcher > ", position +"> "+ arrScMarks[position] );
            }
        }

LOGCAT

Daten eingebe

09-01 05:37:59.658 2466-2466/app E/Watcher >: 1> 
09-01 05:38:00.638 2466-2466/app E/Watcher >: 1> 1
09-01 05:38:02.518 2466-2466/app E/Watcher >: 2> 
09-01 05:38:02.798 2466-2466/app E/Watcher >: 2> 2
09-01 05:38:04.478 2466-2466/app E/Watcher >: 3> 
09-01 05:38:05.318 2466-2466/app E/Watcher >: 3> 3
09-01 05:38:06.878 2466-2466/app E/Watcher >: 4> 
09-01 05:38:07.758 2466-2466/app E/Watcher >: 4> 4
09-01 05:38:09.928 2466-2466/app E/Watcher >: 5> 
09-01 05:38:10.278 2466-2466/app E/Watcher >: 5> 5

Während des Bildlaufs

09-01 05:48:49.188 16362-16362/app E/Watcher >: 0> 0
09-01 05:48:49.538 16362-16362/app E/Watcher >: 1> 0
09-01 05:48:49.708 16362-16362/app E/Watcher >: 2> 0
09-01 05:48:49.888 16362-16362/app E/Watcher >: 3> 0
09-01 05:48:50.268 16362-16362/app E/Watcher >: 4> 0
09-01 05:48:50.538 16362-16362/app E/Watcher >: 5> 0
09-01 05:48:50.558 16362-16362/app E/Watcher >: 6> 0
09-01 05:48:50.868 16362-16362/app E/Watcher >: 8> 0
09-01 05:48:52.708 16362-16362/app E/Watcher >: 9> 0
09-01 05:48:52.768 16362-16362/app E/Watcher >: 0> 0
09-01 05:48:52.768 16362-16362/app E/Watcher >: 10> 0
09-01 05:49:20.648 16362-16362/app E/Watcher >: 9> 0
09-01 05:49:20.648 16362-16362/app E/Watcher >: 18> 0
09-01 05:49:20.738 16362-16362/app E/Watcher >: 8> 0
09-01 05:49:20.738 16362-16362/app E/Watcher >: 17> 0
09-01 05:49:20.818 16362-16362/app E/Watcher >: 7> 0
09-01 05:49:20.888 16362-16362/app E/Watcher >: 5> 0
09-01 05:49:20.888 16362-16362/app E/Watcher >: 15> 0
09-01 05:49:20.898 16362-16362/app E/Watcher >: 4> 0
09-01 05:49:20.898 16362-16362/app E/Watcher >: 14> 0
09-01 05:49:20.968 16362-16362/app E/Watcher >: 3> 0
09-01 05:49:20.968 16362-16362/app E/Watcher >: 13> 0
09-01 05:49:21.068 16362-16362/app E/Watcher >: 6> 0
09-01 05:49:21.068 16362-16362/app E/Watcher >: 16> 0
09-01 05:49:22.008 16362-16362/app E/Watcher >: 1> 0
09-01 05:49:22.008 16362-16362/app E/Watcher >: 11> 0
09-01 05:49:22.058 16362-16362/app E/Watcher >: 0> 0
09-01 05:49:22.058 16362-16362/app E/Watcher >: 10> 0
09-01 05:49:22.058 16362-16362/app E/Watcher >: 10> 0
09-01 05:49:22.098 16362-16362/app E/Watcher >: 9> 0
09-01 05:49:22.098 16362-16362/app E/Watcher >: 18> 0
09-01 05:49:22.108 16362-16362/app E/Watcher >: 9> 0

Während der erneuten Eingabe des Werts nach dem Scrollen

09-01 05:56:32.288 16362-16362/app E/Watcher >: 1> 
09-01 05:56:32.288 16362-16362/app E/Watcher >: 10> 
09-01 05:56:32.288 16362-16362/app E/Watcher >: 10> 
09-01 05:56:32.288 16362-16362/app E/Watcher >: 1> 
09-01 05:56:33.438 16362-16362/app E/Watcher >: 1> 1
09-01 05:56:33.438 16362-16362/app E/Watcher >: 10> 1
09-01 05:56:33.438 16362-16362/app E/Watcher >: 10> 1
09-01 05:56:33.438 16362-16362/app E/Watcher >: 1> 1
09-01 05:56:34.918 16362-16362/app E/Watcher >: 11> 
09-01 05:56:34.918 16362-16362/app E/Watcher >: 2> 
09-01 05:56:36.248 16362-16362/app E/Watcher >: 11> 2
09-01 05:56:36.248 16362-16362/app E/Watcher >: 2> 2
09-01 05:56:37.918 16362-16362/app E/Watcher >: 3> 
09-01 05:56:37.918 16362-16362/app E/Watcher >: 12> 
09-01 05:56:37.918 16362-16362/app E/Watcher >: 3> 
09-01 05:56:39.008 16362-16362/app E/Watcher >: 3> 3
09-01 05:56:39.008 16362-16362/app E/Watcher >: 12> 3
09-01 05:56:39.008 16362-16362/app E/Watcher >: 3> 3