Android ListView Drag and Drop for Cellular and ICS "Error: report on reduction: false"

I am trying to create a ListView that I can sort using drag and drop.

I tried following the Android manual here and some source code provided on Git over. In addition, I do not want to use the sample Music application, as I am trying to use the new tools mentioned in Honeycomb and above.

So far I have managed to create a list and I can drag and drop items. Unfortunately, when I drop an item into a list, I get the following error:

"I / ViewRoot (22739): Transmission Downgrade Report: false."

I have a suspicion that my calendar listener is not created on the desired item, and therefore the transition will never be called. Here are some source codes, thank you for your help.

XML for the list:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/dropTarget"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
     android:layout_weight="1">
    <ListView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@android:id/list" >
    </ListView>
</LinearLayout>

My list: I have not yet managed to get into the event "ACTION_DROP" so that the code is not tested. Just what I was working on. My main question is: I never get into ACTION_DROP.

public class procedureListView extends ListActivity {
    private ListView mListView = null;
    private ArrayAdapter<String> mArrayAdapter = null;
    private View layoutDropArea = null;

    public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.list);

          String[] countries = getResources().getStringArray(R.array.arrayOfStuff);
          mArrayAdapter = new ArrayAdapter<String>(this, R.layout.list_item, countries);
          setListAdapter(mArrayAdapter);

          mListView = getListView();
          mListView.setTextFilterEnabled(true);

          layoutDropArea = findViewById(R.id.dropTarget);

          setupDragDrop();
    }
    /**
     * Setup what to do when we drag list items
     */
    public void setupDragDrop(){
        mListView.setOnItemLongClickListener(new OnItemLongClickListener() {
            public boolean onItemLongClick(AdapterView<?> arg0, View v, int position, long arg3){
                String value = (String) ((TextView) v).getText();
                ClipData data = ClipData.newPlainText("procedure", value);
                v.startDrag(data, new mDragShadowBuilder(v), null, 0);          
                return true;
            }
        });
        myDragListener mDragListener = new myDragListener();
        //mListView.setOnDragListener(mDragListener);

        layoutDropArea.setOnDragListener(mDragListener);



    }
    protected class myDragListener implements OnDragListener{

        public boolean onDrag(View v, DragEvent event) {
            final int action = event.getAction();
            switch (action) {
                case DragEvent.ACTION_DRAG_ENTERED:
                    v.setBackgroundColor(Color.GRAY);
                    break;
                case DragEvent.ACTION_DRAG_EXITED:
                    v.setBackgroundColor(Color.TRANSPARENT);
                    break;
                case DragEvent.ACTION_DRAG_STARTED:
                    break;
                case DragEvent.ACTION_DRAG_LOCATION:
                    v.setVisibility(View.VISIBLE);
                // return processDragStarted(event);
                case DragEvent.ACTION_DROP:
                    v.setBackgroundColor(Color.TRANSPARENT);
                    int newPosition = mListView.getPositionForView(v);
                    if (newPosition != ListView.INVALID_POSITION)
                        return processDrop(event, newPosition);
                    else
                        return false;
            }
            return false;
        }

    }

    private boolean processDrop(DragEvent event, int newPosition) {
        ClipData data = event.getClipData();
        if (data != null) {
            if (data.getItemCount() > 0) {
                Item item = data.getItemAt(0);
                String value = item.toString();
                updateViewsAfterDropComplete(value, newPosition);
                return true;
            }
        }
        return false;
    }
    private void updateViewsAfterDropComplete(String listItem, int index) {
        Log.d("InsertItem", "Position: "+ index);
        mArrayAdapter.insert(listItem, index);
        mArrayAdapter.notifyDataSetChanged();
    }
    private boolean processDragStarted(DragEvent event) {
        ClipDescription clipDesc = event.getClipDescription();
        if (clipDesc != null) {
            return clipDesc.hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN);
        }
        return false;
    }
}

Thank you so much for your help!

UPDATE:

I could not understand why. But when I changed the case of switching to this, it seemed to work:

switch (action) {
                case DragEvent.ACTION_DRAG_ENTERED:
                    //v.setBackgroundColor(Color.GRAY);
                    return false;

                case DragEvent.ACTION_DRAG_EXITED:
                    //v.setBackgroundColor(Color.TRANSPARENT);
                    return true;

                case DragEvent.ACTION_DRAG_STARTED:
                    return true;

                case DragEvent.ACTION_DRAG_LOCATION:
                    //v.setVisibility(View.VISIBLE);
                    return false;
                // return processDragStarted(event);
                case DragEvent.ACTION_DROP:
                    v.setBackgroundColor(Color.TRANSPARENT);
                    int newPosition = mListView.pointToPosition((int)(event.getX()),(int) event.getY());
                    Log.d("Position", Integer.toString(newPosition));
                    if (newPosition != ListView.INVALID_POSITION)
                        return processDrop(event, newPosition);
                    else
                        return false;
                default:
                    return true;

            }