Android - Multiple selection in ListView

Question

Okay, I am stuck whole day trying to get Checkbox added in listview. I have two part

If I click on any item in the listbox, it will load something (this part is already implemented).
There is a checkbox with each item. I want to be able to check any 10 or whatever number of items so that even if I scroll through the list, the selection will not get lost.

Can anyone please help me regarding that? One of the solution I checked is this solution, but I don't want to restructure whole code unless it is necessary.

MAINACTIVITY:

public class ShowList  extends Activity{

    static final String LIST_KEY_ID = "bookid";
    static final String LIST_KEY_NAME = "bookname";
    static final String LIST_KEY_WRITER = "writer";

    ListView list;
    MylibmanList adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show_list);
        setupActionBar();

        mylibmandbhandler db = new mylibmandbhandler(this);
        List<mylibman> allfld = db.getAllRecord();
        db.close();
        ArrayList<HashMap<String, String>> allbookList = new ArrayList<HashMap<String, String>>();
        for (mylibman cn : allfld) {
            HashMap<String, String> map = new HashMap<String, String>();
                map.put(LIST_KEY_ID, Integer.toString(cn.getBookid()));
            map.put(LIST_KEY_NAME, cn.getBookname());
                map.put(LIST_KEY_WRITER, cn.getWriter());

                allbookList.add(map);
        }
        list=(ListView)findViewById(R.id.list);
        adapter=new MylibmanList(this, allbookList);
        list.setAdapter(adapter);

        list.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                batchid.clear();
                HashMap<String, String> list_hashMap = (HashMap<String, String>) parent.getItemAtPosition(position);
                String currlist = list_hashMap.get(LIST_KEY_ID);
                Intent returnIntent  = new Intent();
                returnIntent.putExtra("bookid",currlist);
                setResult(RESULT_OK,returnIntent );
                finish();
            }
        });

ADAPTER CLASS:

public class MylibmanList extends BaseAdapter {
        private Activity activity;
        private ArrayList<HashMap<String, String>> data;
        private static LayoutInflater inflater=null;

        public MylibmanList(Activity a, ArrayList<HashMap<String, String>> d) {
            activity = a;
            data=d;
            inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        static class ViewHolder {
            TextView title;
            TextView artist;
            TextView duration;
            CheckBox check;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            View vi=convertView;
            if(convertView==null)
                vi = inflater.inflate(R.layout.listrow_row, null);

            ViewHolder holder = new ViewHolder();
            holder.title = (TextView)vi.findViewById(R.id.title);
            holder.artist = (TextView)vi.findViewById(R.id.artist);
            holder.duration = (TextView)vi.findViewById(R.id.duration);
            holder.check = (CheckBox)vi.findViewById(R.id.check);

            holder.check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    Log.d("test","t3"); // Don't know what to do 
                }
            });
            vi.setTag(holder);
            holder.check.setTag(data.get(position));

            HashMap<String, String> book = new HashMap<String, String>();
            book = data.get(position);

            ViewHolder holderfin = (ViewHolder) vi.getTag();
            holderfin.title.setText(book.get(ShowList.LIST_KEY_NAME));
            holderfin.artist.setText(book.get(ShowList.LIST_KEY_WRITER));
            holderfin.duration.setText(book.get(ShowList.LIST_KEY_ID));
            holderfin.check.setChecked(false);
            return vi;
        }
    }

XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="5dip" >

    <LinearLayout android:id="@+id/thumbnail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="3dip"
        android:layout_alignParentLeft="true"
        android:background="@drawable/image_bg"
        android:layout_marginRight="5dip">
 <!--
        <ImageView
            android:id="@+id/list_image"
            android:contentDescription="@string/bookimage"
            android:layout_width="50dip"
            android:layout_height="50dip"/>
 -->
    </LinearLayout>


    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/thumbnail"
        android:layout_toRightOf="@+id/thumbnail"
        android:focusableInTouchMode="false"
        android:clickable="false"
        android:focusable="false"
        android:textColor="#040404"
        android:typeface="sans"
        android:textSize="18sp"
        android:textStyle="bold"/>


    <TextView
        android:id="@+id/artist"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/title"
        android:focusableInTouchMode="false"
        android:clickable="false"
        android:focusable="false"
        android:textColor="#343434"
        android:textSize="13sp"
        android:layout_marginTop="1dip"
        android:layout_toRightOf="@+id/thumbnail" />


    <TextView
        android:id="@+id/duration"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignTop="@id/title"
        android:gravity="right"
        android:focusableInTouchMode="false"
        android:clickable="false"
        android:focusable="false"
        android:layout_marginRight="5dip"
        android:textSize="12sp"
        android:textColor="#10bcc9"
        android:textStyle="bold"/>

     <CheckBox
        android:id="@+id/check"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:focusable="false"
        android:layout_marginRight="10dp" />
</RelativeLayout>

can you add the XML of listrow_row so can help you with your first problem and also, you want to check on the checkbox when clicking on checkbox or when you click on onItemClick or may you consider on onItemLongClick?! please be more precise about what you want — Coderji
– Coderji, Commented Nov 21, 2013 at 16:07
I want to be able to select 10 or whatever random rows from the listview (say I have 100 rows), and each time I check a checbox, I will store there "duration" to a ArrayList .. Right now, if I check some checkbox, and scroll down, all selection from last view is lost (I guess listview works like that) — abdfahim
– abdfahim, Commented Nov 21, 2013 at 16:12
so when you click on checkbox, not when you click on listview (not within onItemClick). — Coderji
– Coderji, Commented Nov 21, 2013 at 16:13
yes, when I click on checkbox ... not listview .. within onItemClick I am already doing something, do not want to change that. — abdfahim
– abdfahim, Commented Nov 21, 2013 at 16:13

vikki · Accepted Answer · 2013-11-22 06:36:13Z

1

Basically, you can have a hashset that contains only the selected items. The code would look like this

public class MylibmanList extends BaseAdapter {
    private Activity activity;
    private ArrayList<HashMap<String, String>> data;
    private static LayoutInflater inflater=null;

    HashSet<String> selectedBooks = new HashSet<String>();

    //This listener will be used on all your checkboxes, there's no need to 
    //create a listener for every checkbox.
    CompoundButton.OnCheckedChangeListener checkChangedListener = new CompoundButton.OnCheckedChangeListener{
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                String bookDuration = (String) buttonView.getTag();
                if(isChecked){
                    selectedBooks.add(bookDuration);
                }else{
                    selectedBooks.remove(bookDuration);
                }
            }
    }


    public MylibmanList(Activity a, ArrayList<HashMap<String, String>> d) {
        activity = a;
        data=d;
        inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    static class ViewHolder {
        TextView title;
        TextView artist;
        TextView duration;
        CheckBox check;
    }


    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if(convertView==null){
            convertView = inflater.inflate(R.layout.listrow_row, null);

            holder = new ViewHolder();
            holder.title = (TextView) convertView.findViewById(R.id.title);
            holder.artist = (TextView) convertView.findViewById(R.id.artist);
            holder.duration = (TextView) convertView.findViewById(R.id.duration);
            holder.check = (CheckBox) convertView.findViewById(R.id.check);


            holder.check.setOnCheckedChangeListener(checkChangedListener);

            convertView.setTag(holder);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }


        HashMap<String, String> book = new HashMap<String, String>();
        book = (HashMap<String, String>) getItem(position);

        holder.check.setTag(book.get(ShowList.LIST_KEY_ID));

        holder.title.setText(book.get(ShowList.LIST_KEY_NAME));
        holder.artist.setText(book.get(ShowList.LIST_KEY_WRITER));
        holder.duration.setText(book.get(ShowList.LIST_KEY_ID));

        boolean bookSelected = false;
        if(selectedBooks.contains(book.get(ShowList.LIST_KEY_ID))){
            bookSelected = true;
        }

        holder.check.setChecked(bookSelected);

        return convertView;
    }

I've changed your getView abit. The viewHolder will now be created only once for each view (as it should). Also, if its not too much of a hustle, you should create a class for your book. Something like

Class Book{
    String title;
    String artist;
    Long duration;
}

edited Nov 22, 2013 at 6:36

answered Nov 21, 2013 at 17:14

vikki

2,8241 gold badge22 silver badges26 bronze badges

Sign up to request clarification or add additional context in comments.

9 Comments

vikki Over a year ago

Let me know if there is any part that you haven't understood.

abdfahim Over a year ago

can you please copy paste the whole adapter class .. as I have just started learning, sometimes I get lost where to insert what. If you kindly put your code together with my code, would be help for my understanding.

vikki Over a year ago

I'm not close to a proper keyboard at the moment. However all you need to do is replace your getView with the one I've posted, then place the remaining parts (selectedBooks and checkChangedListener) at the top of your class, they're class members. You can place them just below the line private static LayoutInflater inflater=null;.

vikki Over a year ago

You can use anything that uniquely identifies your data. And you can use the hashset as it doesn't allow duplicates.

vikki Over a year ago

Don't use a public static .... You can create a method on your adapter called public getSelectedBooks() which will return the the hashset, and another called addSelectedBooks() which will add books to your selectedBooks set. Then you should save the state of this set from within your activity so that the set is not lost for example when the user rotates the screen. For that, see this question.

|

Collectives™ on Stack Overflow

Android - Multiple selection in ListView

1 Answer 1

9 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

9 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related