listview-with-checkbox

Hi All! Its quite easy to handle the list view with the adapters class but some times it becomes mess in some cases. Handling Checkbox inside list is one of them. So Lets learn about handling checkboxes inside list view. Download Source

Add MainActivity.java

public class MainActivity extends ActionBarActivity implements TotalListener{

    private static final String TAG = Test.class.getSimpleName();
    ImageView articleImage;
    ListView mList;
    TextView total;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mList = (ListView) findViewById(R.id.list);
        total = (TextView) findViewById(R.id.total);
        String [] string = {};
        TestAdapter ad = new TestAdapter(this, R.layout.test, string);
        ad.setListener(this);
        mList.setAdapter(ad);

    }

    @Override    public void onTotalChanged(int sum) {
        total.setText("Total = " + String.valueOf(sum));
    }
}

Now add TestAdapter.java

import android.content.Context;
import android.content.res.TypedArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.TextView;

public class TestAdapter extends ArrayAdapter {
    private LayoutInflater mInflater;
    private String[] mStrings = {"10", "20", "30", "40", "50", "60", "70", "80", "90",
            "100", "110", "120", "130", "140", "10", "20", "30", "40", "50", "60", "70",
            "80", "90", "100", "110", "120", "130", "140"};
    private TypedArray mIcons;
    private int mViewResourceId;
    Holder holder;

    public void setListener(TotalListener listener) {
        this.listener = listener;
    }

    private TotalListener listener;
    ArrayList selectedStrings = new ArrayList();

    public TestAdapter(Context ctx, int viewResourceId, String[] strings) {
        super(ctx, viewResourceId, strings);
        mInflater = (LayoutInflater) ctx
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mStrings = strings;
        mViewResourceId = viewResourceId;
    }

    public int getCount() {
        return mStrings.length;
    }

    public String getItem(int position) {
        return mStrings[position];
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(final int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = mInflater.inflate(mViewResourceId, null);
            holder = new Holder();
            holder.textView = (TextView) convertView.findViewById(R.id.text);
            holder.checkBox = (CheckBox) convertView.findViewById(R.id.checkbox);
            convertView.setTag(holder);
        } else {
            holder = (Holder) convertView.getTag();
            holder.checkBox.setText(mStrings[position]);
            holder.textView.setText(mStrings[position]);
            holder.checkBox.setChecked(false);
            if (selectedStrings.size() <= position) {
                selectedStrings.add(position, false);
            } else holder.checkBox.setChecked(selectedStrings.get(position));
            holder.checkBox.setOnClickListener(new View.OnClickListener() {
                @Override                public void onClick(View v) {
                    boolean state = selectedStrings.get(position);
                    selectedStrings.remove(position);
                    selectedStrings.add(position, state ? false : true);
                    int sum = 0;
                    for (int i = 0; i < selectedStrings.size(); i++) {
                        if (selectedStrings.get(i)) {
                            sum += Integer.parseInt(mStrings[i]);
                        }
                        listener.onTotalChanged(sum);
                    }
                }
            });
            return convertView;
        }
        class Holder {
            CheckBox checkBox;
            TextView textView;
        }
    }
}
       

 Now add Interface TotalListener.java

public interface TotalListener {
    public void onTotalChanged(int sum);
}

Now add layouts in res/layout folder Add activity_main.xml Add test.xml Download Source