CheckBox in ListView multiple select

Question

Good day to all.

I have a list view with checkboxes near each textview. When I check one checkbox and scroll down, random other checkboxes also get checked. I've read this post and a couple others here and they all say that the state of each checkbox needs to be saved in a boolean list at getView(). How would I go about doing that?

Thanks.

Edited for code:

This is the code of the adapter, containing also the getView() method.

public class MyCustomAdapter extends BaseAdapter
{
    public ArrayList<Error> list;
    private Context mContext;
    private LayoutInflater mInflator;

    public MyCustomAdapter(Context context, int textViewResourceId, ArrayList<Error> list)
    {
        this.list = list;
        this.mContext = context;
        mInflator = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

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

@Override
public Error getItem(int position) 
{
    return list.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) 
{
    ViewHolder holder;

    if(convertView == null)
    {
        holder = new ViewHolder();

        convertView = mInflator.inflate(R.layout.listviewrow, null);

        holder.text = (TextView)convertView.findViewById(R.id.text);
        holder.checkbox = (CheckBox)convertView.findViewById(R.id.checkbox);

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

    final int pos = position;
    holder.text.setText(list.get(position).getDescription());
    holder.checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
        {
            list.get(pos).setChecked(isChecked);
        }
    });

    return convertView;
}

static class ViewHolder
{
    TextView text;
    CheckBox checkbox;
}



}

Answer 1

Below code working for me

My mainActivity

public class MainActivity extends Activity {

    private ListView llChb;

    private String[] data = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j",
            "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
            "x", "y", "z" };
    private ArrayList<String> arrData=null;

    private ArrayList<InfoRowdata> infodata;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        arrData=new ArrayList<String>();
        arrData.add("a");
        arrData.add("b");
        arrData.add("c");
        arrData.add("d");
        arrData.add("e");
        arrData.add("f");
        arrData.add("g");
        arrData.add("h");
        arrData.add("i");
        arrData.add("j");
        arrData.add("k");
        arrData.add("l");
        arrData.add("m");
        arrData.add("n");
        arrData.add("o");
        arrData.add("p");
        llChb = (ListView) findViewById(R.id.llChb);

        infodata = new ArrayList<InfoRowdata>();
        for (int i = 0; i < data.length; i++) {
            infodata.add(new InfoRowdata(false, i));
            // System.out.println(i);
            //System.out.println("Data is == "+data[i]);
        }
        llChb.invalidate();
        llChb.setAdapter(new MyAdapter());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    public class MyAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return data.length;
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            View row = null;
            row = View.inflate(getApplicationContext(), R.layout.row, null);
            TextView tvContent=(TextView) row.findViewById(R.id.tvContent);
            //tvContent.setText(data[position]);
            tvContent.setText(data[position]);
            //System.out.println("The Text is here like.. == "+tvContent.getText().toString());

            final CheckBox cb = (CheckBox) row
                    .findViewById(R.id.chbContent);
            cb.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if (infodata.get(position).isclicked) {
                            infodata.get(position).isclicked = false;
                        } else {
                            infodata.get(position).isclicked = true;
                        }

                    for(int i=0;i<infodata.size();i++)
                    {
                        if (infodata.get(i).isclicked)
                        {
                            System.out.println("Selectes Are == "+ data[i]);
                        }
                    }
                }
            });

            if (infodata.get(position).isclicked) {

                cb.setChecked(true);
            }
            else {
                cb.setChecked(false);
            }
            return row;
        }

    }
}

My InfoRowdata Model Class

public class InfoRowdata {

    public boolean isclicked=false;
    public int index;
    /*public String fanId;
    public String strAmount;*/

    public InfoRowdata(boolean isclicked,int index/*,String fanId,String strAmount*/)
    {
        this.index=index;
        this.isclicked=isclicked;
        /*this.fanId=fanId;
        this.strAmount=strAmount;*/
    }

}

My MainXml

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <ListView
        android:id="@+id/llChb"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</RelativeLayout>

This is custom RowXml for ListView

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/rlMain"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <RelativeLayout
            android:id="@+id/rlInner"
            android:layout_width="fill_parent"
            android:layout_height="50dp" >

            <TextView
                android:id="@+id/tvContent"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:text="Medium Text"
                android:textColor="#000000" />

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

        </RelativeLayout>

    </RelativeLayout>