Android ListView with Checkboxes: How to capture checked items?

Question

I have to do a ListView with CheckBoxes and then display the checked and unchecked items when user presses the button. The problem is I don\'t know

Answer 1

I didn't completely understand what the problem is but I can provide you one useful extension of ListView which helps you manipulate with string data (set\get checked values):

public class MultipleChoiceListView extends ListView {

public MultipleChoiceListView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

public MultipleChoiceListView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public MultipleChoiceListView(Context context) {
    super(context);
}

@Override
public void setAdapter(ListAdapter adapter) {
    throw new RuntimeException(
        "This component doesn't support custom adapter. Use setData method to supply some data to show.");
}

/**
 * Sets the data that should be displayed for choosing
 * 
 * @param data List<String>
 */
public void setData(List<String> data) {
    super.setAdapter(new ArrayAdapter<String>(getContext(), android.R.layout.simple_list_item_multiple_choice, data));
    super.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
}

/**
 * Sets the data that should be choosen by default
 * 
 * @param checkedData List<String>
 */
public void setCheckedData(List<String> checkedData) {
    for (int index = 0; index < getCount(); index++) {
        if (checkedData.contains(getItemAtPosition(index))) {
            setItemChecked(index, true);
        }
    }
}

/**
 * Returns checked by the user data passed in {@link #setData(List)}
 * 
 * @return List<String>
 */
public List<String> getCheckedData() {
    SparseBooleanArray checked = getCheckedItemPositions();
    List<String> checkedResult = new ArrayList<String>();

    for (int i = 0; i < checked.size(); i++) {
        if (checked.valueAt(i)) {
            checkedResult.add(getAdapter().getItem(checked.keyAt(i)).toString());
        }
    }
    return checkedResult;
}

}

Example of using:

    private void initListMultiple() {
    String[] data = new String[] {"first", "second", "third", "forth"};
    String[] checkedData = new String[] {"second", "forth"};

    multipleChoiceListView.setData(Arrays.asList(data));
    multipleChoiceListView.setCheckedData(Arrays.asList(checkedData));
}

private void onTestListButtonClicked(View view) {
    listResultTextView.setText(Arrays.toString(listView.getCheckedData().toArray()));
}