All geek questions in one place

Enable adapter for ListView

I have a ListView with an adapter that has a switch in the layout, so every item in the list has a switch.

I want to use this code:

mySwitch.setOnCheckedChangeListener(new OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        // do something, the isChecked will be
        // true if the switch is in the On position
    }
});

But I don’t know WHERE to use it: in the adapter class or in the class containing the class, and how I can do this, knowing which element I change when I switch this switch, so I can change its properties.

Edit: This is an adapter class with an implemented method. It starts every time the getView method is called, and not when it should start (when the switch is switched), and the logs are displayed in the logarithm, but the object that switches to switch mode does not change, when I scroll down and scroll up, the switch returns in the initial state :

package com.nahue.actions;

import java.util.ArrayList;

import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;


/*@SuppressLint("ViewHolder") */public class AdapterActions extends ArrayAdapter<Action>{

    // our ViewHolder.
    // caches our TextView
    static class ViewHolderItem {
        TextView codigo;
        TextView accion;
        TextView evento;
        Switch UnSwitch;
    }

    Activity context;
    ArrayList<Action> listaActions;

    // Le pasamos al constructor el contexto y la lista de contactos
    public AdapterActions(Activity context, ArrayList<Action> listaActions) {
        super(context, R.layout.layout_adapter_actions, listaActions);
        this.context = context;
        this.listaActions = listaActions;




    }

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

        ViewHolderItem viewHolder;

        // Rescatamos cada item del listview y lo inflamos con nuestro layout
        //View item = convertView;
        //item = context.getLayoutInflater().inflate(R.layout.layout_adapter_actions, null);

        // well set up the ViewHolder
        viewHolder = new ViewHolderItem();

        if(convertView==null){

            // inflate the layout
            LayoutInflater inflater = ((Activity) context).getLayoutInflater();
            convertView = inflater.inflate(R.layout.layout_adapter_actions, parent, false);

            // well set up the ViewHolder
            viewHolder = new ViewHolderItem();
            viewHolder.codigo = (TextView) convertView.findViewById(R.id.codigo);
            viewHolder.accion = (TextView) convertView.findViewById(R.id.accion);
            viewHolder.evento = (TextView) convertView.findViewById(R.id.evento);
            viewHolder.UnSwitch = (Switch) convertView.findViewById(R.id.activa);

            // store the holder with the view.
            convertView.setTag(viewHolder);

        }else{
            // we've just avoided calling findViewById() on resource everytime
            // just use the viewHolder
            viewHolder = (ViewHolderItem) convertView.getTag();
        }

        Action a = new Action(0, 1, 1, true);
        Accion LaAccion = new Accion(0, "", "");
        Evento ElEvento = new Evento(0, "", "");

        //ACTIONS
                ActionsSQLite base = new ActionsSQLite(context, "Actions", null,1);
                SQLiteDatabase db1 = base.getReadableDatabase();
                db1 = context.openOrCreateDatabase("Actions",SQLiteDatabase.OPEN_READONLY, null);

                String query = "SELECT * FROM Actions WHERE Id = " + String.valueOf(position + 1);
                Cursor c1 = db1.rawQuery(query, null);

                try{
                    if(c1!=null){

                        int i = c1.getColumnIndexOrThrow("Id");
                        int j = c1.getColumnIndexOrThrow("IdAccion");
                        int k = c1.getColumnIndexOrThrow("IdEvento");
                        int l = c1.getColumnIndexOrThrow("Activa");
                        boolean esActiva;

                        //Nos aseguramos de que existe al menos un registro
                        while(c1.moveToNext()){
                            if (c1.getInt(l) == 0){
                                esActiva = false;
                            } else
                            {
                                esActiva = true;
                            }
                            //Recorremos el cursor hasta que no haya más registros
                            a = new Action(c1.getInt(i), c1.getInt(j), c1.getInt(k), esActiva);
                        }
                    }
                    else 
                        Toast.makeText(context.getApplicationContext(), 
                                  "No hay nada :(", Toast.LENGTH_LONG).show();
                  }
                  catch (Exception e){
                    Log.i("bdActions", "Error al abrir o crear la base de datos" + e); 
                  }

                  if(db1!=null){
                        db1.close();
                }   


        //EVENTOS
        EventosSQLite base2 = new EventosSQLite(this.context, "Eventos", null, 1);
        SQLiteDatabase db2 = base2.getReadableDatabase();
        db2 = context.openOrCreateDatabase("Eventos",SQLiteDatabase.OPEN_READONLY, null);

        String query2 = "SELECT * FROM Eventos WHERE Id = " + a.getIdEvento();
        Cursor c2 = db2.rawQuery(query2, null);
        try{
            if(c2!=null){

                int h = c2.getColumnIndexOrThrow("Id");
                int i = c2.getColumnIndexOrThrow("Nombre");
                int j = c2.getColumnIndexOrThrow("Descripcion");

                //Nos aseguramos de que existe al menos un registro
                while(c2.moveToNext()){
                    //Recorremos el cursor hasta que no haya más registros
                    ElEvento = new Evento(c2.getInt(h), c2.getString(i), c2.getString(j));
                }
            }
            else 
                Toast.makeText(context.getApplicationContext(), 
                      "No hay nada :(", Toast.LENGTH_LONG).show();
        }
        catch (Exception e){
            Log.i("bdEventos", "Error al abrir o crear la base de datos" + e); 
        }

        if(db2!=null){
            db2.close();
        }   
        //ACCIONES
        AccionesSQLite base3 = new AccionesSQLite(context, "acciones", null,1);
        SQLiteDatabase db3 = base3.getReadableDatabase();
        db3 = context.openOrCreateDatabase("Acciones", SQLiteDatabase.OPEN_READONLY, null);

        String query3 = "SELECT * FROM Acciones WHERE Id = " + String.valueOf(a.getIdAccion());
        Cursor c3 = db3.rawQuery(query3, null);
        try{
            if(c3!=null){

                int h = c3.getColumnIndexOrThrow("Id");
                int i = c3.getColumnIndexOrThrow("Nombre");
                int j = c3.getColumnIndexOrThrow("Descripcion");

                //Nos aseguramos de que existe al menos un registro
                while(c3.moveToNext()){
                    //Recorremos el cursor hasta que no haya más registros
                    LaAccion = new Accion(c3.getInt(h), c3.getString(i), c3.getString(j));
                }
            }
            else 
                Toast.makeText(context.getApplicationContext(), 
                      "No hay nada :(", Toast.LENGTH_LONG).show();
        }
        catch (Exception e){
            Log.i("bdAcciones", "Error al abrir o crear la base de datos" + e); 
        }

        if(db3!=null){
            db3.close();
        }

        // object item based on the position

        viewHolder.UnSwitch.setChecked(a.getActiva());
        // assign values if the object is not null
        if(a != null) {
            // get the TextView from the ViewHolder and then set the text (item name) and tag (item ID) values
            viewHolder.codigo.setText(String.valueOf(a.getId()));
            viewHolder.codigo.setTag(a.getId());
            viewHolder.accion.setText(LaAccion.getNombre());
            viewHolder.evento.setText(ElEvento.getNombre());
            viewHolder.UnSwitch.setChecked(a.getActiva());
        }

        viewHolder.UnSwitch.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            //you can modify Action here.
                Log.e("Listener del switch", "Entró");
            listaActions.get(position).setActiva(isChecked);
            Log.e("Listener del switch", "Modificó la action en la lista del adapter");
            ActividadPrincipal.listaActions.get(position).setActiva(isChecked);
            Log.e("Listener del switch", "Modificó la action en la lista de la ActividadPrincipal");
            int isActiva;
            if(isChecked == true)
            {
                isActiva = 1;
                Log.e("Listener del switch", "isActiva = 1");
            } else
            {
                isActiva = 0;
                Log.e("Listener del switch", "isActiva = 0");
            }
            String query = "UPDATE Actions SET Activa = " + String.valueOf(isActiva) + " WHERE Id = " + String.valueOf(position);
            Log.e("Listener del switch", "query creado");
            ActionsSQLite helper1  = new ActionsSQLite(context, "Actions", null, 1);
            Log.e("Listener del switch", "Creo el helper");
            SQLiteDatabase db = helper1.getWritableDatabase();
            Log.e("Listener del switch", "obtenida la base escribible");
            db.execSQL(query);
            Log.e("Listener del switch", "Query ejecutado");
        }});



        return convertView; 
    }   
}
+4
source share
2 answers

solvable.

OnCheckedChangeListener() , , getView(). ? : onClickListener(), , Switch.

:

viewHolder.isChecked1 = viewHolder.UnSwitch.isChecked();
        map.put(position, viewHolder.isChecked1);
        viewHolder.UnSwitch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.e("OnClick", "Se clickeó");

                listaActions.get(position).setActiva(map.get(position));
                Log.e("Listener del switch", "Modificó la action en la lista de la ActividadPrincipal");
                int isActiva;
                if(map.get(position) == true)
                {
                    isActiva = 0;
                    Log.e("Listener del switch", "isActiva = 1");
                    map.put(position, false);
                } else
                {
                    isActiva = 1;
                    Log.e("Listener del switch", "isActiva = 0");
                    map.put(position, true);
                }
                String query = "UPDATE Actions SET Activa = " + String.valueOf(isActiva) + " WHERE Id = " + String.valueOf(position+1);
                Log.e("Consulta:", query);
                Log.e("Listener del switch", "query creado");
                Log.e("La position debería ser", String.valueOf(position+1));
                Log.e("Y el valor del map.get(position) es", String.valueOf(map.get(position)));
                ActionsSQLite helper1  = new ActionsSQLite(context, "Actions", null, 1);
                Log.e("Listener del switch", "Creo el helper");
                SQLiteDatabase db = helper1.getWritableDatabase();
                Log.e("Listener del switch", "obtenida la base escribible");
                db.execSQL(query);
                Log.e("Listener del switch", "Query ejecutado");
            }
        });
+7

getView "position" , . :

final Action action = listActions.get(position);
activa.setChecked(action.getActiva());
activa.setOnCheckedChangeListener(new OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    //you can modify Action here.
    action.setActive(isChecked);
    }
});

. . , , listActions .

, ViewHolder! . https://www.codeofaninja.com/2013/09/android-viewholder-pattern-example.html.

+1

Source: https://habr.com/ru/post/1568077/

More articles:


All Articles