android checkable listview

Question

I am quite new in developing android applications. I have created my own list adapter as show below and I want that list to be checkable. What do I have to do so that my li

Answer 1

I liked Carlos Sessa solution from his book "50 Android hacks".

my activity_favorites.xml looks like this:

My FavoritesActivity.java looks like this:

package com.myproject;

import java.util.ArrayList;

import com.myproject.R;
import com.myproject.model.Package;
import com.myproject.adapter.FavoritesPackageArrayAdapter;
import com.myproject.utils.DatabaseHelper;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.widget.ListView;

public class FavoritesActivity extends Activity
{
    protected ListView list;
    protected String selectedPackage;
    protected ArrayList packages;
    protected FavoritesPackageArrayAdapter adapter;

    private DatabaseHelper db = new DatabaseHelper(this);

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_favorites);

        packages = db.getPackages();
        adapter = new FavoritesPackageArrayAdapter(this, -1, packages);
        list = (ListView) findViewById(R.id.favContainer);
        list.setAdapter(adapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
    {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public void onSelect(View view)
    {
        int pos = list.getCheckedItemPosition();
        if(ListView.INVALID_POSITION != pos)
            selectedPackage = packages.get(pos).getId();
    }

}

My ListView adapter (FavoritesPackageArrayAdapter.java) is quite simple:

package com.myproject.adapter;

import java.util.List;

import com.myproject.model.Package;
import com.myproject.view.PackageView;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;

public class FavoritesPackageArrayAdapter extends ArrayAdapter
{

    public FavoritesPackageArrayAdapter(Context context, int resource, List objects)
    {
        super(context, resource, objects);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        if(convertView == null)
            convertView = new PackageView(getContext());

        Package pack = getItem(position);
        PackageView packView = (PackageView) convertView;
        packView.setPackage(pack);

        return convertView;
    }

}

In order to have list items checkable, your view has to implement Checkable interface. My PackageView.java looks like:

package com.myproject.view;

import java.util.ArrayList;

import com.myproject.R;
import com.myproject.model.Package;
import com.myproject.model.PackageEvent;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Checkable;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.CheckBox;

public class PackageView extends LinearLayout implements Checkable
{
    private View v;
    private TextView tv0;
    private TextView tv1;
    private TextView tv2;
    private TextView tv3;

    private CheckBox testCheckBox;

    public PackageView(Context context)
    {
        super(context);
        LayoutInflater inflater = LayoutInflater.from(context);
        v = inflater.inflate(R.layout.favorites_package, this, true);
        tv0 = (TextView) v.findViewById(R.id.favPackageId);
        tv1 = (TextView) v.findViewById(R.id.favEventDate);
        tv2 = (TextView) v.findViewById(R.id.favEventAddres);
        tv3 = (TextView) v.findViewById(R.id.favEventState);

        // I don't have checkbox in my layout, but if I had:
        // testCheckBox = (CheckBox) v.findViewById(R.id.checkBoxId);
    }

    public void setPackage(Package pack)
    {
        // my custom method where I set package id, date, and time 
        ...
    }

    private Boolean checked = false;

    @Override
    public boolean isChecked()
    {
        return checked;
        // if I had checkbox in my layout I could
        // return testCheckBox.checked();
    }

    @Override
    public void setChecked(boolean checked)
    {
        this.checked = checked;

        // since I choose not to have check box in my layout, I change background color
        // according to checked state
        if(isChecked())
            ...
        else
            ...
        // if I had checkbox in my layout I could
        // testCheckBox.setChecked(checked);
    }

    @Override
    public void toggle()
    {
        checked = !checked;
        // if I had checkbox in my layout I could
        // return testCheckBox.toggle();
    }

}

And finally xml layout of each list item (favorites_package.xml):

If you wanted to have actual checkbox in your layout it's xml should look something like:

If you left checkbox clickable, you could only check it only by clicking on checkbox itself. Also don't make your layout clickable, for some reason it doesn't work with Checkable interface.