android.widget.ListView#getCheckedItemPositions ( )源码实例Demo

private static int[] getSelectedIndices(ListView listView) {
    SparseBooleanArray sparseArray = listView.getCheckedItemPositions();
    int selectedCount = 0;
    for (int i = 0; i < sparseArray.size(); ++i) {
        if (sparseArray.valueAt(i)) {
            selectedCount++;
        }
    }
    int[] indices = new int[selectedCount];
    for (int i = 0, j = 0; i < sparseArray.size(); ++i) {
        if (sparseArray.valueAt(i)) {
            indices[j++] = sparseArray.keyAt(i);
        }
    }
    return indices;
}
 

protected void processSelectedStates(ListView listView, ConfigureAdapterItem[] items) {
    final int choiceMode = listView.getChoiceMode();
    if (choiceMode == AbsListView.CHOICE_MODE_MULTIPLE) {
        final SparseBooleanArray array = listView.getCheckedItemPositions();
        int key;
        for (int i = 0; i < array.size(); i++) {
            key = array.keyAt(i);
            items[key].setChecked(array.valueAt(i));
        }
    } else if (choiceMode == AbsListView.CHOICE_MODE_SINGLE) {
        final int position = listView.getCheckedItemPosition();
        for (int i = 0; i < items.length; i++) {
            items[i].setChecked(i == position);
        }
    }
}
 

private int[] getSelectedIndices(ListView listView) {
    SparseBooleanArray sparseArray = listView.getCheckedItemPositions();
    int selectedCount = 0;
    for (int i = 0; i < sparseArray.size(); ++i) {
        if (sparseArray.valueAt(i)) {
            selectedCount++;
        }
    }
    int[] indices = new int[selectedCount];
    for (int i = 0, j = 0; i < sparseArray.size(); ++i) {
        if (sparseArray.valueAt(i)) {
            indices[j++] = sparseArray.keyAt(i);
        }
    }
    return indices;
}
 

private int[] getSelectedIndices(ListView listView) {
    SparseBooleanArray sparseArray = listView.getCheckedItemPositions();
    int selectedCount = 0;
    for (int i = 0; i < sparseArray.size(); ++i) {
        if (sparseArray.valueAt(i)) {
            selectedCount++;
        }
    }
    int[] indices = new int[selectedCount];
    for (int i = 0, j = 0; i < sparseArray.size(); ++i) {
        if (sparseArray.valueAt(i)) {
            indices[j++] = sparseArray.keyAt(i);
        }
    }
    return indices;
}
 

private final List<String> getSelectedReceiverIDs(final ListView listView) {
    final List<String> receiverIDs = new ArrayList<>();

    final Adapter adapter = listView.getAdapter();
    final SparseBooleanArray checkedItems = listView.getCheckedItemPositions();
    for (int i = 0; i < adapter.getCount(); i++) {
        if (checkedItems.get(i)) {
            receiverIDs.add(((Receiver) adapter.getItem(i)).id);
        }
    }

    return receiverIDs;
}
 

private void deleteSelectedItems(){
    ListView notesList = (ListView) findViewById(R.id.notes_list);
    CursorAdapter adapter = (CursorAdapter) notesList.getAdapter();
    SparseBooleanArray checkedItemPositions = notesList.getCheckedItemPositions();
    for (int i=0; i < checkedItemPositions.size(); i++) {
        if(checkedItemPositions.valueAt(i)) {
            DbAccess.trashNote(getBaseContext(), (int) (long) adapter.getItemId(checkedItemPositions.keyAt(i)));
        }
    }
}