Merge "Guard against null clipdata objects." into nyc-dev

import libcore.io.IoUtils;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

/**

     * This should be run from inside an AsyncTask.

     */

    public List<DocumentInfo> getClippedDocuments() {

        return getDocumentsFromClipData(mClipboard.getPrimaryClip());

        ClipData data = mClipboard.getPrimaryClip();

        return data == null ? Collections.EMPTY_LIST : getDocumentsFromClipData(data);

    }

    /**

                case DragEvent.ACTION_DROP:

                    // After a drop event, always stop highlighting the target.

                    setDropTargetHighlight(v, false);

                    ClipData clipData = event.getClipData();

                    if (clipData == null) {

                        Log.w(TAG, "Received invalid drop event with null clipdata. Ignoring.");

                        return false;

                    }

                    // Don't copy from the cwd into the cwd. Note: this currently doesn't work for

                    // multi-window drag, because localState isn't carried over from one process to

                    // another.

                    Object src = event.getLocalState();

                    DocumentInfo dst = getDestination(v);

                    if (Objects.equals(src, dst)) {

                        if (DEBUG) Log.d(TAG, "Drop target same as source. Ignoring.");

                        return false;

                    }

                    // Recognize multi-window drag and drop based on the fact that localState is not

                    // carried between processes. It will stop working when the localsState behavior

                    // is changed. The info about window should be passed in the localState then.

                    Metrics.logUserAction(getContext(),

                            src == null ? Metrics.USER_ACTION_DRAG_N_DROP_MULTI_WINDOW

                                    : Metrics.USER_ACTION_DRAG_N_DROP);

                    copyFromClipData(event.getClipData(), dst);

                    copyFromClipData(clipData, dst);

                    return true;

            }

            return false;