Android Get Checkbox Info From Listview

I have a ListView with multiple checkboxes (one for each list item). What would be the best way to create an array containing information from the selected checkboxes. For Example,

Solution 1:

If you used ListView's built-in checkbox method with setChoiceMode() then you only need to call getCheckedItemIds() or getCheckedItemPositions().

publicclassExampleextendsActivityimplementsOnClickListener {
    ListView mListView;
    String[] array = newString[] {"Ham", "Turkey", "Bread"};

    @OverridepublicvoidonCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ArrayAdapter<String> adapter = newArrayAdapter<String>(this, android.R.layout.simple_list_item_checked, array);

        mListView = (ListView) findViewById(R.id.list);
        mListView.setAdapter(adapter);
        mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(this);
    }

    publicvoidonClick(View view) {
        SparseBooleanArray positions = mListView.getCheckedItemPositions();
        int size = positions.size();
        for(int index = 0; index < size; index++) {
            Log.v("Example", "Checked: " + array[positions.keyAt(index)]);
        }
    }
}

If the Adapter is bound to a Cursor, then this becomes much more practical.

Solution 2:

You can create a ArrayList and then whatever items users checked add them to arraylist.

Below Snippet does exactly what you want.

package com.windrealm.android;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

publicclassPlanetsActivityextendsActivity
{

    private ListView mainListView;
    private Planet[] planets;
    private ArrayAdapter<Planet> listAdapter;
    private Button check;
    private Context context;

    /** Called when the activity is first created. */@OverridepublicvoidonCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        context = PlanetsActivity.this;
        check = (Button) findViewById(R.id.check);
        // Find the ListView resource.
        mainListView = (ListView) findViewById(R.id.mainListView);

        // When item is tapped, toggle checked properties of CheckBox and// Planet.
        mainListView
                .setOnItemClickListener(newAdapterView.OnItemClickListener()
                {
                    @OverridepublicvoidonItemClick(AdapterView<?> parent, View item,
                            int position, long id)
                    {
                        Planetplanet= listAdapter.getItem(position);
                        planet.toggleChecked();
                        PlanetViewHolderviewHolder= (PlanetViewHolder) item
                                .getTag();
                        viewHolder.getCheckBox().setChecked(planet.isChecked());
                    }
                });

        // Create and populate planets.
        planets = (Planet[]) getLastNonConfigurationInstance();
        if (planets == null)
        {
            planets = newPlanet[]
            { newPlanet("Mercury"), newPlanet("Venus"), newPlanet("Earth"),
                    newPlanet("Mars"), newPlanet("Jupiter"),
                    newPlanet("Saturn"), newPlanet("Uranus"),
                    newPlanet("Neptune"), newPlanet("Ceres"),
                    newPlanet("Pluto"), newPlanet("Haumea"),
                    newPlanet("Makemake"), newPlanet("Eris") };
        }
        ArrayList<Planet> planetList = newArrayList<Planet>();
        planetList.addAll(Arrays.asList(planets));

        // Set our custom array adapter as the ListView's adapter.
        listAdapter = newPlanetArrayAdapter(this, planetList);
        mainListView.setAdapter(listAdapter);

        check.setOnClickListener(newOnClickListener()
        {

            @OverridepublicvoidonClick(View view)
            {
                for (inti=0; i < listAdapter.getCount(); i++)
                {
                    Planetplanet= listAdapter.getItem(i);
                    if (planet.isChecked())
                    {
                                            //Add this item in ArrayList
                        Toast.makeText(context,
                                planet.getName() + " is Checked!!",
                                Toast.LENGTH_SHORT).show();
                    }
                }

            }
        });
    }

    /** Holds planet data. */privatestaticclassPlanet
    {
        privateStringname="";
        privatebooleanchecked=false;

        publicPlanet()
        {
        }

        publicPlanet(String name)
        {
            this.name = name;
        }

        publicPlanet(String name, boolean checked)
        {
            this.name = name;
            this.checked = checked;
        }

        public String getName()
        {
            return name;
        }

        publicvoidsetName(String name)
        {
            this.name = name;
        }

        publicbooleanisChecked()
        {
            return checked;
        }

        publicvoidsetChecked(boolean checked)
        {
            this.checked = checked;
        }

        public String toString()
        {
            return name;
        }

        publicvoidtoggleChecked()
        {
            checked = !checked;
        }
    }

    /** Holds child views for one row. */privatestaticclassPlanetViewHolder
    {
        private CheckBox checkBox;
        private TextView textView;

        publicPlanetViewHolder()
        {
        }

        publicPlanetViewHolder(TextView textView, CheckBox checkBox)
        {
            this.checkBox = checkBox;
            this.textView = textView;
        }

        public CheckBox getCheckBox()
        {
            return checkBox;
        }

        publicvoidsetCheckBox(CheckBox checkBox)
        {
            this.checkBox = checkBox;
        }

        public TextView getTextView()
        {
            return textView;
        }

        publicvoidsetTextView(TextView textView)
        {
            this.textView = textView;
        }
    }

    /** Custom adapter for displaying an array of Planet objects. */privatestaticclassPlanetArrayAdapterextendsArrayAdapter<Planet>
    {

        private LayoutInflater inflater;

        publicPlanetArrayAdapter(Context context, List<Planet> planetList)
        {
            super(context, R.layout.simplerow, R.id.rowTextView, planetList);
            // Cache the LayoutInflate to avoid asking for a new one each time.
            inflater = LayoutInflater.from(context);
        }

        @Overridepublic View getView(int position, View convertView, ViewGroup parent)
        {
            // Planet to displayPlanetplanet= (Planet) this.getItem(position);

            // The child views in each row.
            CheckBox checkBox;
            TextView textView;

            // Create a new row viewif (convertView == null)
            {
                convertView = inflater.inflate(R.layout.simplerow, null);

                // Find the child views.
                textView = (TextView) convertView
                        .findViewById(R.id.rowTextView);
                checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01);

                // Optimization: Tag the row with it's child views, so we don't// have to// call findViewById() later when we reuse the row.
                convertView.setTag(newPlanetViewHolder(textView, checkBox));

                // If CheckBox is toggled, update the planet it is tagged with.
                checkBox.setOnClickListener(newView.OnClickListener()
                {
                    publicvoidonClick(View v)
                    {
                        CheckBoxcb= (CheckBox) v;
                        Planetplanet= (Planet) cb.getTag();
                        planet.setChecked(cb.isChecked());
                    }
                });
            }
            // Reuse existing row viewelse
            {
                // Because we use a ViewHolder, we avoid having to call// findViewById().PlanetViewHolderviewHolder= (PlanetViewHolder) convertView
                        .getTag();
                checkBox = viewHolder.getCheckBox();
                textView = viewHolder.getTextView();
            }

            // Tag the CheckBox with the Planet it is displaying, so that we can// access the planet in onClick() when the CheckBox is toggled.
            checkBox.setTag(planet);

            // Display planet data
            checkBox.setChecked(planet.isChecked());
            textView.setText(planet.getName());

            return convertView;
        }

    }

    public Object onRetainNonConfigurationInstance()
    {
        return planets;
    }
}