DirectoryFragment.java revision 0b14db3cf5eac43736462999337c9a3efdc1ac81 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.documentsui;
18
19import static com.android.documentsui.DocumentsActivity.TAG;
20import static com.android.documentsui.DocumentsActivity.State.ACTION_MANAGE;
21import static com.android.documentsui.DocumentsActivity.State.MODE_GRID;
22import static com.android.documentsui.DocumentsActivity.State.MODE_LIST;
23import static com.android.documentsui.model.DocumentInfo.getCursorInt;
24import static com.android.documentsui.model.DocumentInfo.getCursorLong;
25import static com.android.documentsui.model.DocumentInfo.getCursorString;
26
27import android.app.Fragment;
28import android.app.FragmentManager;
29import android.app.FragmentTransaction;
30import android.app.LoaderManager.LoaderCallbacks;
31import android.content.ContentResolver;
32import android.content.Context;
33import android.content.Intent;
34import android.content.Loader;
35import android.database.Cursor;
36import android.graphics.Bitmap;
37import android.graphics.Point;
38import android.net.Uri;
39import android.os.AsyncTask;
40import android.os.Bundle;
41import android.provider.DocumentsContract;
42import android.provider.DocumentsContract.Document;
43import android.text.format.DateUtils;
44import android.text.format.Formatter;
45import android.text.format.Time;
46import android.util.Log;
47import android.util.SparseBooleanArray;
48import android.view.ActionMode;
49import android.view.LayoutInflater;
50import android.view.Menu;
51import android.view.MenuItem;
52import android.view.View;
53import android.view.ViewGroup;
54import android.widget.AbsListView;
55import android.widget.AbsListView.MultiChoiceModeListener;
56import android.widget.AdapterView;
57import android.widget.AdapterView.OnItemClickListener;
58import android.widget.BaseAdapter;
59import android.widget.GridView;
60import android.widget.ImageView;
61import android.widget.ListView;
62import android.widget.TextView;
63import android.widget.Toast;
64
65import com.android.documentsui.DocumentsActivity.State;
66import com.android.documentsui.model.DocumentInfo;
67import com.android.documentsui.model.RootInfo;
68import com.android.internal.util.Predicate;
69import com.google.android.collect.Lists;
70
71import java.util.ArrayList;
72import java.util.List;
73import java.util.concurrent.atomic.AtomicInteger;
74
75/**
76 * Display the documents inside a single directory.
77 */
78public class DirectoryFragment extends Fragment {
79
80    private View mEmptyView;
81    private ListView mListView;
82    private GridView mGridView;
83
84    private AbsListView mCurrentView;
85
86    private Predicate<DocumentInfo> mFilter;
87
88    public static final int TYPE_NORMAL = 1;
89    public static final int TYPE_SEARCH = 2;
90    public static final int TYPE_RECENT_OPEN = 3;
91
92    private int mType = TYPE_NORMAL;
93
94    private Point mThumbSize;
95
96    private DocumentsAdapter mAdapter;
97    private LoaderCallbacks<DirectoryResult> mCallbacks;
98
99    private static final String EXTRA_TYPE = "type";
100    private static final String EXTRA_AUTHORITY = "authority";
101    private static final String EXTRA_ROOT_ID = "rootId";
102    private static final String EXTRA_DOC_ID = "docId";
103    private static final String EXTRA_QUERY = "query";
104
105    private static AtomicInteger sLoaderId = new AtomicInteger(4000);
106
107    private int mLastSortOrder = -1;
108
109    private final int mLoaderId = sLoaderId.incrementAndGet();
110
111    public static void showNormal(FragmentManager fm, Uri uri) {
112        show(fm, TYPE_NORMAL, uri.getAuthority(), null, DocumentsContract.getDocumentId(uri), null);
113    }
114
115    public static void showSearch(FragmentManager fm, Uri uri, String query) {
116        show(fm, TYPE_SEARCH, uri.getAuthority(), null, DocumentsContract.getDocumentId(uri),
117                query);
118    }
119
120    public static void showRecentsOpen(FragmentManager fm) {
121        show(fm, TYPE_RECENT_OPEN, null, null, null, null);
122    }
123
124    private static void show(FragmentManager fm, int type, String authority, String rootId,
125            String docId, String query) {
126        final Bundle args = new Bundle();
127        args.putInt(EXTRA_TYPE, type);
128        args.putString(EXTRA_AUTHORITY, authority);
129        args.putString(EXTRA_ROOT_ID, rootId);
130        args.putString(EXTRA_DOC_ID, docId);
131        args.putString(EXTRA_QUERY, query);
132
133        final DirectoryFragment fragment = new DirectoryFragment();
134        fragment.setArguments(args);
135
136        final FragmentTransaction ft = fm.beginTransaction();
137        ft.replace(R.id.container_directory, fragment);
138        ft.commitAllowingStateLoss();
139    }
140
141    public static DirectoryFragment get(FragmentManager fm) {
142        // TODO: deal with multiple directories shown at once
143        return (DirectoryFragment) fm.findFragmentById(R.id.container_directory);
144    }
145
146    @Override
147    public View onCreateView(
148            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
149        final Context context = inflater.getContext();
150        final View view = inflater.inflate(R.layout.fragment_directory, container, false);
151
152        mEmptyView = view.findViewById(android.R.id.empty);
153
154        mListView = (ListView) view.findViewById(R.id.list);
155        mListView.setOnItemClickListener(mItemListener);
156        mListView.setMultiChoiceModeListener(mMultiListener);
157
158        mGridView = (GridView) view.findViewById(R.id.grid);
159        mGridView.setOnItemClickListener(mItemListener);
160        mGridView.setMultiChoiceModeListener(mMultiListener);
161
162        return view;
163    }
164
165    @Override
166    public void onActivityCreated(Bundle savedInstanceState) {
167        super.onActivityCreated(savedInstanceState);
168
169        final Context context = getActivity();
170
171        mAdapter = new DocumentsAdapter();
172        mType = getArguments().getInt(EXTRA_TYPE);
173
174        mCallbacks = new LoaderCallbacks<DirectoryResult>() {
175            @Override
176            public Loader<DirectoryResult> onCreateLoader(int id, Bundle args) {
177                final State state = getDisplayState(DirectoryFragment.this);
178
179                final String authority = getArguments().getString(EXTRA_AUTHORITY);
180                final String rootId = getArguments().getString(EXTRA_ROOT_ID);
181                final String docId = getArguments().getString(EXTRA_DOC_ID);
182                final String query = getArguments().getString(EXTRA_QUERY);
183
184                Uri contentsUri;
185                switch (mType) {
186                    case TYPE_NORMAL:
187                        contentsUri = DocumentsContract.buildChildDocumentsUri(authority, docId);
188                        return new DirectoryLoader(context, rootId, contentsUri, state.sortOrder);
189                    case TYPE_SEARCH:
190                        contentsUri = DocumentsContract.buildSearchDocumentsUri(
191                                authority, docId, query);
192                        return new DirectoryLoader(context, rootId, contentsUri, state.sortOrder);
193                    case TYPE_RECENT_OPEN:
194                        final RootsCache roots = DocumentsApplication.getRootsCache(context);
195                        final List<RootInfo> matchingRoots = roots.getMatchingRoots(state);
196                        return new RecentLoader(context, matchingRoots);
197                    default:
198                        throw new IllegalStateException("Unknown type " + mType);
199
200                }
201            }
202
203            @Override
204            public void onLoadFinished(Loader<DirectoryResult> loader, DirectoryResult result) {
205                mAdapter.swapCursor(result.cursor);
206            }
207
208            @Override
209            public void onLoaderReset(Loader<DirectoryResult> loader) {
210                mAdapter.swapCursor(null);
211            }
212        };
213
214        updateDisplayState();
215    }
216
217    public void updateDisplayState() {
218        final State state = getDisplayState(this);
219
220        if (mLastSortOrder != state.sortOrder) {
221            getLoaderManager().restartLoader(mLoaderId, null, mCallbacks);
222            mLastSortOrder = state.sortOrder;
223        }
224
225        mListView.smoothScrollToPosition(0);
226        mGridView.smoothScrollToPosition(0);
227
228        mListView.setVisibility(state.mode == MODE_LIST ? View.VISIBLE : View.GONE);
229        mGridView.setVisibility(state.mode == MODE_GRID ? View.VISIBLE : View.GONE);
230
231        mFilter = new MimePredicate(state.acceptMimes);
232
233        final int choiceMode;
234        if (state.allowMultiple) {
235            choiceMode = ListView.CHOICE_MODE_MULTIPLE_MODAL;
236        } else {
237            choiceMode = ListView.CHOICE_MODE_NONE;
238        }
239
240        final int thumbSize;
241        if (state.mode == MODE_GRID) {
242            thumbSize = getResources().getDimensionPixelSize(R.dimen.grid_width);
243            mListView.setAdapter(null);
244            mListView.setChoiceMode(ListView.CHOICE_MODE_NONE);
245            mGridView.setAdapter(mAdapter);
246            mGridView.setColumnWidth(getResources().getDimensionPixelSize(R.dimen.grid_width));
247            mGridView.setNumColumns(GridView.AUTO_FIT);
248            mGridView.setChoiceMode(choiceMode);
249            mCurrentView = mGridView;
250        } else if (state.mode == MODE_LIST) {
251            thumbSize = getResources().getDimensionPixelSize(android.R.dimen.app_icon_size);
252            mGridView.setAdapter(null);
253            mGridView.setChoiceMode(ListView.CHOICE_MODE_NONE);
254            mListView.setAdapter(mAdapter);
255            mListView.setChoiceMode(choiceMode);
256            mCurrentView = mListView;
257        } else {
258            throw new IllegalStateException();
259        }
260
261        mThumbSize = new Point(thumbSize, thumbSize);
262    }
263
264    private OnItemClickListener mItemListener = new OnItemClickListener() {
265        @Override
266        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
267            final Cursor cursor = mAdapter.getItem(position);
268            final DocumentInfo doc = DocumentInfo.fromDirectoryCursor(cursor);
269            if (mFilter.apply(doc)) {
270                ((DocumentsActivity) getActivity()).onDocumentPicked(doc);
271            }
272        }
273    };
274
275    private MultiChoiceModeListener mMultiListener = new MultiChoiceModeListener() {
276        @Override
277        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
278            mode.getMenuInflater().inflate(R.menu.mode_directory, menu);
279            return true;
280        }
281
282        @Override
283        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
284            final State state = getDisplayState(DirectoryFragment.this);
285
286            final MenuItem open = menu.findItem(R.id.menu_open);
287            final MenuItem share = menu.findItem(R.id.menu_share);
288            final MenuItem delete = menu.findItem(R.id.menu_delete);
289
290            final boolean manageMode = state.action == ACTION_MANAGE;
291            open.setVisible(!manageMode);
292            share.setVisible(manageMode);
293            delete.setVisible(manageMode);
294
295            return true;
296        }
297
298        @Override
299        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
300            final SparseBooleanArray checked = mCurrentView.getCheckedItemPositions();
301            final ArrayList<DocumentInfo> docs = Lists.newArrayList();
302            final int size = checked.size();
303            for (int i = 0; i < size; i++) {
304                if (checked.valueAt(i)) {
305                    final Cursor cursor = mAdapter.getItem(checked.keyAt(i));
306                    final DocumentInfo doc = DocumentInfo.fromDirectoryCursor(cursor);
307                    docs.add(doc);
308                }
309            }
310
311            final int id = item.getItemId();
312            if (id == R.id.menu_open) {
313                DocumentsActivity.get(DirectoryFragment.this).onDocumentsPicked(docs);
314                mode.finish();
315                return true;
316
317            } else if (id == R.id.menu_share) {
318                onShareDocuments(docs);
319                mode.finish();
320                return true;
321
322            } else if (id == R.id.menu_delete) {
323                onDeleteDocuments(docs);
324                mode.finish();
325                return true;
326
327            } else {
328                return false;
329            }
330        }
331
332        @Override
333        public void onDestroyActionMode(ActionMode mode) {
334            // ignored
335        }
336
337        @Override
338        public void onItemCheckedStateChanged(
339                ActionMode mode, int position, long id, boolean checked) {
340            if (checked) {
341                // Directories cannot be checked
342                final Cursor cursor = mAdapter.getItem(position);
343                final String docMimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE);
344                if (Document.MIME_TYPE_DIR.equals(docMimeType)) {
345                    mCurrentView.setItemChecked(position, false);
346                }
347            }
348
349            mode.setTitle(getResources()
350                    .getString(R.string.mode_selected_count, mCurrentView.getCheckedItemCount()));
351        }
352    };
353
354    private void onShareDocuments(List<DocumentInfo> docs) {
355        Intent intent;
356        if (docs.size() == 1) {
357            final DocumentInfo doc = docs.get(0);
358
359            intent = new Intent(Intent.ACTION_SEND);
360            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
361            intent.addCategory(Intent.CATEGORY_DEFAULT);
362            intent.setType(doc.mimeType);
363            intent.putExtra(Intent.EXTRA_STREAM, doc.uri);
364
365        } else if (docs.size() > 1) {
366            intent = new Intent(Intent.ACTION_SEND_MULTIPLE);
367            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
368            intent.addCategory(Intent.CATEGORY_DEFAULT);
369
370            final ArrayList<String> mimeTypes = Lists.newArrayList();
371            final ArrayList<Uri> uris = Lists.newArrayList();
372            for (DocumentInfo doc : docs) {
373                mimeTypes.add(doc.mimeType);
374                uris.add(doc.uri);
375            }
376
377            intent.setType(findCommonMimeType(mimeTypes));
378            intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
379
380        } else {
381            return;
382        }
383
384        intent = Intent.createChooser(intent, getActivity().getText(R.string.share_via));
385        startActivity(intent);
386    }
387
388    private void onDeleteDocuments(List<DocumentInfo> docs) {
389        final Context context = getActivity();
390        final ContentResolver resolver = context.getContentResolver();
391
392        boolean hadTrouble = false;
393        for (DocumentInfo doc : docs) {
394            if (!doc.isDeleteSupported()) {
395                Log.w(TAG, "Skipping " + doc);
396                hadTrouble = true;
397                continue;
398            }
399
400            if (!DocumentsContract.deleteDocument(resolver, doc.uri)) {
401                Log.w(TAG, "Failed to delete " + doc);
402                hadTrouble = true;
403            }
404        }
405
406        if (hadTrouble) {
407            Toast.makeText(context, R.string.toast_failed_delete, Toast.LENGTH_SHORT).show();
408        }
409    }
410
411    private static State getDisplayState(Fragment fragment) {
412        return ((DocumentsActivity) fragment.getActivity()).getDisplayState();
413    }
414
415    private interface Footer {
416        public View getView(View convertView, ViewGroup parent);
417    }
418
419    private static class LoadingFooter implements Footer {
420        @Override
421        public View getView(View convertView, ViewGroup parent) {
422            final Context context = parent.getContext();
423            if (convertView == null) {
424                final LayoutInflater inflater = LayoutInflater.from(context);
425                convertView = inflater.inflate(R.layout.item_loading, parent, false);
426            }
427            return convertView;
428        }
429    }
430
431    private class MessageFooter implements Footer {
432        private final int mIcon;
433        private final String mMessage;
434
435        public MessageFooter(int icon, String message) {
436            mIcon = icon;
437            mMessage = message;
438        }
439
440        @Override
441        public View getView(View convertView, ViewGroup parent) {
442            final Context context = parent.getContext();
443            final State state = getDisplayState(DirectoryFragment.this);
444
445            if (convertView == null) {
446                final LayoutInflater inflater = LayoutInflater.from(context);
447                if (state.mode == MODE_LIST) {
448                    convertView = inflater.inflate(R.layout.item_message_list, parent, false);
449                } else if (state.mode == MODE_GRID) {
450                    convertView = inflater.inflate(R.layout.item_message_grid, parent, false);
451                } else {
452                    throw new IllegalStateException();
453                }
454            }
455
456            final ImageView icon = (ImageView) convertView.findViewById(android.R.id.icon);
457            final TextView title = (TextView) convertView.findViewById(android.R.id.title);
458            icon.setImageResource(mIcon);
459            title.setText(mMessage);
460            return convertView;
461        }
462    }
463
464    private class DocumentsAdapter extends BaseAdapter {
465        private Cursor mCursor;
466        private int mCursorCount;
467
468        private List<Footer> mFooters = Lists.newArrayList();
469
470        public void swapCursor(Cursor cursor) {
471            mCursor = cursor;
472            mCursorCount = cursor != null ? cursor.getCount() : 0;
473
474            mFooters.clear();
475
476            final Bundle extras = cursor != null ? cursor.getExtras() : null;
477            if (extras != null) {
478                final String info = extras.getString(DocumentsContract.EXTRA_INFO);
479                if (info != null) {
480                    mFooters.add(new MessageFooter(
481                            com.android.internal.R.drawable.ic_menu_info_details, info));
482                }
483                final String error = extras.getString(DocumentsContract.EXTRA_ERROR);
484                if (error != null) {
485                    mFooters.add(new MessageFooter(
486                            com.android.internal.R.drawable.ic_dialog_alert, error));
487                }
488                if (extras.getBoolean(DocumentsContract.EXTRA_LOADING, false)) {
489                    mFooters.add(new LoadingFooter());
490                }
491            }
492
493            if (isEmpty()) {
494                mEmptyView.setVisibility(View.VISIBLE);
495            } else {
496                mEmptyView.setVisibility(View.GONE);
497            }
498
499            notifyDataSetChanged();
500        }
501
502        @Override
503        public View getView(int position, View convertView, ViewGroup parent) {
504            if (position < mCursorCount) {
505                return getDocumentView(position, convertView, parent);
506            } else {
507                position -= mCursorCount;
508                return mFooters.get(position).getView(convertView, parent);
509            }
510        }
511
512        private View getDocumentView(int position, View convertView, ViewGroup parent) {
513            final Context context = parent.getContext();
514            final State state = getDisplayState(DirectoryFragment.this);
515
516            final RootsCache roots = DocumentsApplication.getRootsCache(context);
517            final ThumbnailCache thumbs = DocumentsApplication.getThumbnailsCache(
518                    context, mThumbSize);
519
520            if (convertView == null) {
521                final LayoutInflater inflater = LayoutInflater.from(context);
522                if (state.mode == MODE_LIST) {
523                    convertView = inflater.inflate(R.layout.item_doc_list, parent, false);
524                } else if (state.mode == MODE_GRID) {
525                    convertView = inflater.inflate(R.layout.item_doc_grid, parent, false);
526                } else {
527                    throw new IllegalStateException();
528                }
529            }
530
531            final Cursor cursor = getItem(position);
532
533            final String docAuthority = getCursorString(cursor, RootCursorWrapper.COLUMN_AUTHORITY);
534            final String docRootId = getCursorString(cursor, RootCursorWrapper.COLUMN_ROOT_ID);
535            final String docId = getCursorString(cursor, Document.COLUMN_DOCUMENT_ID);
536            final String docMimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE);
537            final String docDisplayName = getCursorString(cursor, Document.COLUMN_DISPLAY_NAME);
538            final long docLastModified = getCursorLong(cursor, Document.COLUMN_LAST_MODIFIED);
539            final int docIcon = getCursorInt(cursor, Document.COLUMN_ICON);
540            final int docFlags = getCursorInt(cursor, Document.COLUMN_FLAGS);
541            final String docSummary = getCursorString(cursor, Document.COLUMN_SUMMARY);
542            final long docSize = getCursorLong(cursor, Document.COLUMN_SIZE);
543
544            final ImageView icon = (ImageView) convertView.findViewById(android.R.id.icon);
545            final TextView title = (TextView) convertView.findViewById(android.R.id.title);
546            final View summaryGrid = convertView.findViewById(R.id.summary_grid);
547            final ImageView icon1 = (ImageView) convertView.findViewById(android.R.id.icon1);
548            final TextView summary = (TextView) convertView.findViewById(android.R.id.summary);
549            final TextView date = (TextView) convertView.findViewById(R.id.date);
550            final TextView size = (TextView) convertView.findViewById(R.id.size);
551
552            final ThumbnailAsyncTask oldTask = (ThumbnailAsyncTask) icon.getTag();
553            if (oldTask != null) {
554                oldTask.cancel(false);
555            }
556
557            if ((docFlags & Document.FLAG_SUPPORTS_THUMBNAIL) != 0) {
558                final Uri uri = DocumentsContract.buildDocumentUri(docAuthority, docId);
559                final Bitmap cachedResult = thumbs.get(uri);
560                if (cachedResult != null) {
561                    icon.setImageBitmap(cachedResult);
562                } else {
563                    final ThumbnailAsyncTask task = new ThumbnailAsyncTask(icon, mThumbSize);
564                    icon.setImageBitmap(null);
565                    icon.setTag(task);
566                    task.execute(uri);
567                }
568            } else if (docIcon != 0) {
569                icon.setImageDrawable(IconUtils.loadPackageIcon(context, docAuthority, docIcon));
570            } else {
571                icon.setImageDrawable(IconUtils.loadMimeIcon(context, docMimeType));
572            }
573
574            title.setText(docDisplayName);
575
576            if (mType == TYPE_RECENT_OPEN) {
577                final RootInfo root = roots.getRoot(docAuthority, docRootId);
578                icon1.setVisibility(View.VISIBLE);
579                icon1.setImageDrawable(root.loadIcon(context));
580                summary.setText(root.getDirectoryString());
581                summary.setVisibility(View.VISIBLE);
582            } else {
583                icon1.setVisibility(View.GONE);
584                if (docSummary != null) {
585                    summary.setText(docSummary);
586                    summary.setVisibility(View.VISIBLE);
587                } else {
588                    summary.setVisibility(View.INVISIBLE);
589                }
590            }
591
592            if (summaryGrid != null) {
593                summaryGrid.setVisibility(
594                        (summary.getVisibility() == View.VISIBLE) ? View.VISIBLE : View.GONE);
595            }
596
597            if (docLastModified == -1) {
598                date.setText(null);
599            } else {
600                date.setText(formatTime(context, docLastModified));
601            }
602
603            if (state.showSize) {
604                size.setVisibility(View.VISIBLE);
605                if (Document.MIME_TYPE_DIR.equals(docMimeType) || docSize == -1) {
606                    size.setText(null);
607                } else {
608                    size.setText(Formatter.formatFileSize(context, docSize));
609                }
610            } else {
611                size.setVisibility(View.GONE);
612            }
613
614            return convertView;
615        }
616
617        @Override
618        public int getCount() {
619            return mCursorCount + mFooters.size();
620        }
621
622        @Override
623        public Cursor getItem(int position) {
624            if (position < mCursorCount) {
625                mCursor.moveToPosition(position);
626                return mCursor;
627            } else {
628                return null;
629            }
630        }
631
632        @Override
633        public long getItemId(int position) {
634            return position;
635        }
636
637        @Override
638        public int getItemViewType(int position) {
639            if (position < mCursorCount) {
640                return 0;
641            } else {
642                return IGNORE_ITEM_VIEW_TYPE;
643            }
644        }
645
646        @Override
647        public boolean areAllItemsEnabled() {
648            return false;
649        }
650
651        @Override
652        public boolean isEnabled(int position) {
653            return position < mCursorCount;
654        }
655    }
656
657    private static class ThumbnailAsyncTask extends AsyncTask<Uri, Void, Bitmap> {
658        private final ImageView mTarget;
659        private final Point mThumbSize;
660
661        public ThumbnailAsyncTask(ImageView target, Point thumbSize) {
662            mTarget = target;
663            mThumbSize = thumbSize;
664        }
665
666        @Override
667        protected void onPreExecute() {
668            mTarget.setTag(this);
669        }
670
671        @Override
672        protected Bitmap doInBackground(Uri... params) {
673            final Context context = mTarget.getContext();
674            final Uri uri = params[0];
675
676            Bitmap result = null;
677            try {
678                result = DocumentsContract.getDocumentThumbnail(
679                        context.getContentResolver(), uri, mThumbSize, null);
680                if (result != null) {
681                    final ThumbnailCache thumbs = DocumentsApplication.getThumbnailsCache(
682                            context, mThumbSize);
683                    thumbs.put(uri, result);
684                }
685            } catch (Exception e) {
686                Log.w(TAG, "Failed to load thumbnail: " + e);
687            }
688            return result;
689        }
690
691        @Override
692        protected void onPostExecute(Bitmap result) {
693            if (mTarget.getTag() == this) {
694                mTarget.setImageBitmap(result);
695                mTarget.setTag(null);
696            }
697        }
698    }
699
700    private static String formatTime(Context context, long when) {
701        // TODO: DateUtils should make this easier
702        Time then = new Time();
703        then.set(when);
704        Time now = new Time();
705        now.setToNow();
706
707        int flags = DateUtils.FORMAT_NO_NOON | DateUtils.FORMAT_NO_MIDNIGHT
708                | DateUtils.FORMAT_ABBREV_ALL;
709
710        if (then.year != now.year) {
711            flags |= DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_SHOW_DATE;
712        } else if (then.yearDay != now.yearDay) {
713            flags |= DateUtils.FORMAT_SHOW_DATE;
714        } else {
715            flags |= DateUtils.FORMAT_SHOW_TIME;
716        }
717
718        return DateUtils.formatDateTime(context, when, flags);
719    }
720
721    private String findCommonMimeType(List<String> mimeTypes) {
722        String[] commonType = mimeTypes.get(0).split("/");
723        if (commonType.length != 2) {
724            return "*/*";
725        }
726
727        for (int i = 1; i < mimeTypes.size(); i++) {
728            String[] type = mimeTypes.get(i).split("/");
729            if (type.length != 2) continue;
730
731            if (!commonType[1].equals(type[1])) {
732                commonType[1] = "*";
733            }
734
735            if (!commonType[0].equals(type[0])) {
736                commonType[0] = "*";
737                commonType[1] = "*";
738                break;
739            }
740        }
741
742        return commonType[0] + "/" + commonType[1];
743    }
744}
745