DirectoryFragment.java revision 6d97d3c1a2ebac4e3f32c7e5bc134864ace1c17f 
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(R.drawable.ic_dialog_alert, info));
481                }
482                final String error = extras.getString(DocumentsContract.EXTRA_ERROR);
483                if (error != null) {
484                    mFooters.add(new MessageFooter(R.drawable.ic_dialog_alert, error));
485                }
486                if (extras.getBoolean(DocumentsContract.EXTRA_LOADING, false)) {
487                    mFooters.add(new LoadingFooter());
488                }
489            }
490
491            if (isEmpty()) {
492                mEmptyView.setVisibility(View.VISIBLE);
493            } else {
494                mEmptyView.setVisibility(View.GONE);
495            }
496
497            notifyDataSetChanged();
498        }
499
500        @Override
501        public View getView(int position, View convertView, ViewGroup parent) {
502            if (position < mCursorCount) {
503                return getDocumentView(position, convertView, parent);
504            } else {
505                position -= mCursorCount;
506                return mFooters.get(position).getView(convertView, parent);
507            }
508        }
509
510        private View getDocumentView(int position, View convertView, ViewGroup parent) {
511            final Context context = parent.getContext();
512            final State state = getDisplayState(DirectoryFragment.this);
513
514            final RootsCache roots = DocumentsApplication.getRootsCache(context);
515            final ThumbnailCache thumbs = DocumentsApplication.getThumbnailsCache(
516                    context, mThumbSize);
517
518            if (convertView == null) {
519                final LayoutInflater inflater = LayoutInflater.from(context);
520                if (state.mode == MODE_LIST) {
521                    convertView = inflater.inflate(R.layout.item_doc_list, parent, false);
522                } else if (state.mode == MODE_GRID) {
523                    convertView = inflater.inflate(R.layout.item_doc_grid, parent, false);
524                } else {
525                    throw new IllegalStateException();
526                }
527            }
528
529            final Cursor cursor = getItem(position);
530
531            final String docAuthority = getCursorString(cursor, RootCursorWrapper.COLUMN_AUTHORITY);
532            final String docRootId = getCursorString(cursor, RootCursorWrapper.COLUMN_ROOT_ID);
533            final String docId = getCursorString(cursor, Document.COLUMN_DOCUMENT_ID);
534            final String docMimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE);
535            final String docDisplayName = getCursorString(cursor, Document.COLUMN_DISPLAY_NAME);
536            final long docLastModified = getCursorLong(cursor, Document.COLUMN_LAST_MODIFIED);
537            final int docIcon = getCursorInt(cursor, Document.COLUMN_ICON);
538            final int docFlags = getCursorInt(cursor, Document.COLUMN_FLAGS);
539            final String docSummary = getCursorString(cursor, Document.COLUMN_SUMMARY);
540            final long docSize = getCursorLong(cursor, Document.COLUMN_SIZE);
541
542            final ImageView icon = (ImageView) convertView.findViewById(android.R.id.icon);
543            final TextView title = (TextView) convertView.findViewById(android.R.id.title);
544            final View summaryGrid = convertView.findViewById(R.id.summary_grid);
545            final ImageView icon1 = (ImageView) convertView.findViewById(android.R.id.icon1);
546            final TextView summary = (TextView) convertView.findViewById(android.R.id.summary);
547            final TextView date = (TextView) convertView.findViewById(R.id.date);
548            final TextView size = (TextView) convertView.findViewById(R.id.size);
549
550            final ThumbnailAsyncTask oldTask = (ThumbnailAsyncTask) icon.getTag();
551            if (oldTask != null) {
552                oldTask.cancel(false);
553            }
554
555            if ((docFlags & Document.FLAG_SUPPORTS_THUMBNAIL) != 0) {
556                final Uri uri = DocumentsContract.buildDocumentUri(docAuthority, docId);
557                final Bitmap cachedResult = thumbs.get(uri);
558                if (cachedResult != null) {
559                    icon.setImageBitmap(cachedResult);
560                } else {
561                    final ThumbnailAsyncTask task = new ThumbnailAsyncTask(icon, mThumbSize);
562                    icon.setImageBitmap(null);
563                    icon.setTag(task);
564                    task.execute(uri);
565                }
566            } else if (docIcon != 0) {
567                icon.setImageDrawable(IconUtils.loadPackageIcon(context, docAuthority, docIcon));
568            } else {
569                icon.setImageDrawable(IconUtils.loadMimeIcon(context, docMimeType));
570            }
571
572            title.setText(docDisplayName);
573
574            if (mType == TYPE_RECENT_OPEN) {
575                final RootInfo root = roots.getRoot(docAuthority, docRootId);
576                icon1.setVisibility(View.VISIBLE);
577                icon1.setImageDrawable(root.loadIcon(context));
578                summary.setText(root.getDirectoryString());
579                summary.setVisibility(View.VISIBLE);
580            } else {
581                icon1.setVisibility(View.GONE);
582                if (docSummary != null) {
583                    summary.setText(docSummary);
584                    summary.setVisibility(View.VISIBLE);
585                } else {
586                    summary.setVisibility(View.INVISIBLE);
587                }
588            }
589
590            if (summaryGrid != null) {
591                summaryGrid.setVisibility(
592                        (summary.getVisibility() == View.VISIBLE) ? View.VISIBLE : View.GONE);
593            }
594
595            if (docLastModified == -1) {
596                date.setText(null);
597            } else {
598                date.setText(formatTime(context, docLastModified));
599            }
600
601            if (state.showSize) {
602                size.setVisibility(View.VISIBLE);
603                if (Document.MIME_TYPE_DIR.equals(docMimeType) || docSize == -1) {
604                    size.setText(null);
605                } else {
606                    size.setText(Formatter.formatFileSize(context, docSize));
607                }
608            } else {
609                size.setVisibility(View.GONE);
610            }
611
612            return convertView;
613        }
614
615        @Override
616        public int getCount() {
617            return mCursorCount + mFooters.size();
618        }
619
620        @Override
621        public Cursor getItem(int position) {
622            if (position < mCursorCount) {
623                mCursor.moveToPosition(position);
624                return mCursor;
625            } else {
626                return null;
627            }
628        }
629
630        @Override
631        public long getItemId(int position) {
632            return position;
633        }
634
635        @Override
636        public int getItemViewType(int position) {
637            if (position < mCursorCount) {
638                return 0;
639            } else {
640                return IGNORE_ITEM_VIEW_TYPE;
641            }
642        }
643
644        @Override
645        public boolean areAllItemsEnabled() {
646            return false;
647        }
648
649        @Override
650        public boolean isEnabled(int position) {
651            return position < mCursorCount;
652        }
653    }
654
655    private static class ThumbnailAsyncTask extends AsyncTask<Uri, Void, Bitmap> {
656        private final ImageView mTarget;
657        private final Point mThumbSize;
658
659        public ThumbnailAsyncTask(ImageView target, Point thumbSize) {
660            mTarget = target;
661            mThumbSize = thumbSize;
662        }
663
664        @Override
665        protected void onPreExecute() {
666            mTarget.setTag(this);
667        }
668
669        @Override
670        protected Bitmap doInBackground(Uri... params) {
671            final Context context = mTarget.getContext();
672            final Uri uri = params[0];
673
674            Bitmap result = null;
675            try {
676                result = DocumentsContract.getDocumentThumbnail(
677                        context.getContentResolver(), uri, mThumbSize, null);
678                if (result != null) {
679                    final ThumbnailCache thumbs = DocumentsApplication.getThumbnailsCache(
680                            context, mThumbSize);
681                    thumbs.put(uri, result);
682                }
683            } catch (Exception e) {
684                Log.w(TAG, "Failed to load thumbnail: " + e);
685            }
686            return result;
687        }
688
689        @Override
690        protected void onPostExecute(Bitmap result) {
691            if (mTarget.getTag() == this) {
692                mTarget.setImageBitmap(result);
693                mTarget.setTag(null);
694            }
695        }
696    }
697
698    private static String formatTime(Context context, long when) {
699        // TODO: DateUtils should make this easier
700        Time then = new Time();
701        then.set(when);
702        Time now = new Time();
703        now.setToNow();
704
705        int flags = DateUtils.FORMAT_NO_NOON | DateUtils.FORMAT_NO_MIDNIGHT
706                | DateUtils.FORMAT_ABBREV_ALL;
707
708        if (then.year != now.year) {
709            flags |= DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_SHOW_DATE;
710        } else if (then.yearDay != now.yearDay) {
711            flags |= DateUtils.FORMAT_SHOW_DATE;
712        } else {
713            flags |= DateUtils.FORMAT_SHOW_TIME;
714        }
715
716        return DateUtils.formatDateTime(context, when, flags);
717    }
718
719    private String findCommonMimeType(List<String> mimeTypes) {
720        String[] commonType = mimeTypes.get(0).split("/");
721        if (commonType.length != 2) {
722            return "*/*";
723        }
724
725        for (int i = 1; i < mimeTypes.size(); i++) {
726            String[] type = mimeTypes.get(i).split("/");
727            if (type.length != 2) continue;
728
729            if (!commonType[1].equals(type[1])) {
730                commonType[1] = "*";
731            }
732
733            if (!commonType[0].equals(type[0])) {
734                commonType[0] = "*";
735                commonType[1] = "*";
736                break;
737            }
738        }
739
740        return commonType[0] + "/" + commonType[1];
741    }
742}
743