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_CREATE;
21import static com.android.documentsui.DocumentsActivity.State.ACTION_MANAGE;
22import static com.android.documentsui.DocumentsActivity.State.MODE_GRID;
23import static com.android.documentsui.DocumentsActivity.State.MODE_LIST;
24import static com.android.documentsui.DocumentsActivity.State.MODE_UNKNOWN;
25import static com.android.documentsui.DocumentsActivity.State.SORT_ORDER_UNKNOWN;
26import static com.android.documentsui.model.DocumentInfo.getCursorInt;
27import static com.android.documentsui.model.DocumentInfo.getCursorLong;
28import static com.android.documentsui.model.DocumentInfo.getCursorString;
29
30import android.app.ActivityManager;
31import android.app.Fragment;
32import android.app.FragmentManager;
33import android.app.FragmentTransaction;
34import android.app.LoaderManager.LoaderCallbacks;
35import android.content.ContentProviderClient;
36import android.content.ContentResolver;
37import android.content.ContentValues;
38import android.content.Context;
39import android.content.Intent;
40import android.content.Loader;
41import android.content.res.Resources;
42import android.database.Cursor;
43import android.graphics.Bitmap;
44import android.graphics.Point;
45import android.graphics.drawable.Drawable;
46import android.graphics.drawable.InsetDrawable;
47import android.net.Uri;
48import android.os.AsyncTask;
49import android.os.Bundle;
50import android.os.CancellationSignal;
51import android.os.OperationCanceledException;
52import android.os.Parcelable;
53import android.provider.DocumentsContract;
54import android.provider.DocumentsContract.Document;
55import android.text.format.DateUtils;
56import android.text.format.Formatter;
57import android.text.format.Time;
58import android.util.Log;
59import android.util.SparseArray;
60import android.util.SparseBooleanArray;
61import android.view.ActionMode;
62import android.view.LayoutInflater;
63import android.view.Menu;
64import android.view.MenuItem;
65import android.view.View;
66import android.view.ViewGroup;
67import android.widget.AbsListView;
68import android.widget.AbsListView.MultiChoiceModeListener;
69import android.widget.AbsListView.RecyclerListener;
70import android.widget.AdapterView;
71import android.widget.AdapterView.OnItemClickListener;
72import android.widget.BaseAdapter;
73import android.widget.GridView;
74import android.widget.ImageView;
75import android.widget.ListView;
76import android.widget.TextView;
77import android.widget.Toast;
78
79import com.android.documentsui.DocumentsActivity.State;
80import com.android.documentsui.ProviderExecutor.Preemptable;
81import com.android.documentsui.RecentsProvider.StateColumns;
82import com.android.documentsui.model.DocumentInfo;
83import com.android.documentsui.model.RootInfo;
84import com.google.android.collect.Lists;
85
86import java.util.ArrayList;
87import java.util.List;
88
89/**
90 * Display the documents inside a single directory.
91 */
92public class DirectoryFragment extends Fragment {
93
94    private View mEmptyView;
95    private ListView mListView;
96    private GridView mGridView;
97
98    private AbsListView mCurrentView;
99
100    public static final int TYPE_NORMAL = 1;
101    public static final int TYPE_SEARCH = 2;
102    public static final int TYPE_RECENT_OPEN = 3;
103
104    public static final int ANIM_NONE = 1;
105    public static final int ANIM_SIDE = 2;
106    public static final int ANIM_DOWN = 3;
107    public static final int ANIM_UP = 4;
108
109    private int mType = TYPE_NORMAL;
110    private String mStateKey;
111
112    private int mLastMode = MODE_UNKNOWN;
113    private int mLastSortOrder = SORT_ORDER_UNKNOWN;
114    private boolean mLastShowSize = false;
115
116    private boolean mHideGridTitles = false;
117
118    private boolean mSvelteRecents;
119    private Point mThumbSize;
120
121    private DocumentsAdapter mAdapter;
122    private LoaderCallbacks<DirectoryResult> mCallbacks;
123
124    private static final String EXTRA_TYPE = "type";
125    private static final String EXTRA_ROOT = "root";
126    private static final String EXTRA_DOC = "doc";
127    private static final String EXTRA_QUERY = "query";
128    private static final String EXTRA_IGNORE_STATE = "ignoreState";
129
130    private final int mLoaderId = 42;
131
132    public static void showNormal(FragmentManager fm, RootInfo root, DocumentInfo doc, int anim) {
133        show(fm, TYPE_NORMAL, root, doc, null, anim);
134    }
135
136    public static void showSearch(FragmentManager fm, RootInfo root, String query, int anim) {
137        show(fm, TYPE_SEARCH, root, null, query, anim);
138    }
139
140    public static void showRecentsOpen(FragmentManager fm, int anim) {
141        show(fm, TYPE_RECENT_OPEN, null, null, null, anim);
142    }
143
144    private static void show(FragmentManager fm, int type, RootInfo root, DocumentInfo doc,
145            String query, int anim) {
146        final Bundle args = new Bundle();
147        args.putInt(EXTRA_TYPE, type);
148        args.putParcelable(EXTRA_ROOT, root);
149        args.putParcelable(EXTRA_DOC, doc);
150        args.putString(EXTRA_QUERY, query);
151
152        final FragmentTransaction ft = fm.beginTransaction();
153        switch (anim) {
154            case ANIM_SIDE:
155                args.putBoolean(EXTRA_IGNORE_STATE, true);
156                break;
157            case ANIM_DOWN:
158                args.putBoolean(EXTRA_IGNORE_STATE, true);
159                ft.setCustomAnimations(R.animator.dir_down, R.animator.dir_frozen);
160                break;
161            case ANIM_UP:
162                ft.setCustomAnimations(R.animator.dir_frozen, R.animator.dir_up);
163                break;
164        }
165
166        final DirectoryFragment fragment = new DirectoryFragment();
167        fragment.setArguments(args);
168
169        ft.replace(R.id.container_directory, fragment);
170        ft.commitAllowingStateLoss();
171    }
172
173    private static String buildStateKey(RootInfo root, DocumentInfo doc) {
174        final StringBuilder builder = new StringBuilder();
175        builder.append(root != null ? root.authority : "null").append(';');
176        builder.append(root != null ? root.rootId : "null").append(';');
177        builder.append(doc != null ? doc.documentId : "null");
178        return builder.toString();
179    }
180
181    public static DirectoryFragment get(FragmentManager fm) {
182        // TODO: deal with multiple directories shown at once
183        return (DirectoryFragment) fm.findFragmentById(R.id.container_directory);
184    }
185
186    @Override
187    public View onCreateView(
188            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
189        final Context context = inflater.getContext();
190        final Resources res = context.getResources();
191        final View view = inflater.inflate(R.layout.fragment_directory, container, false);
192
193        mEmptyView = view.findViewById(android.R.id.empty);
194
195        mListView = (ListView) view.findViewById(R.id.list);
196        mListView.setOnItemClickListener(mItemListener);
197        mListView.setMultiChoiceModeListener(mMultiListener);
198        mListView.setRecyclerListener(mRecycleListener);
199
200        // Indent our list divider to align with text
201        final Drawable divider = mListView.getDivider();
202        final boolean insetLeft = res.getBoolean(R.bool.list_divider_inset_left);
203        final int insetSize = res.getDimensionPixelSize(R.dimen.list_divider_inset);
204        if (insetLeft) {
205            mListView.setDivider(new InsetDrawable(divider, insetSize, 0, 0, 0));
206        } else {
207            mListView.setDivider(new InsetDrawable(divider, 0, 0, insetSize, 0));
208        }
209
210        mGridView = (GridView) view.findViewById(R.id.grid);
211        mGridView.setOnItemClickListener(mItemListener);
212        mGridView.setMultiChoiceModeListener(mMultiListener);
213        mGridView.setRecyclerListener(mRecycleListener);
214
215        return view;
216    }
217
218    @Override
219    public void onDestroyView() {
220        super.onDestroyView();
221
222        // Cancel any outstanding thumbnail requests
223        final ViewGroup target = (mListView.getAdapter() != null) ? mListView : mGridView;
224        final int count = target.getChildCount();
225        for (int i = 0; i < count; i++) {
226            final View view = target.getChildAt(i);
227            mRecycleListener.onMovedToScrapHeap(view);
228        }
229
230        // Tear down any selection in progress
231        mListView.setChoiceMode(AbsListView.CHOICE_MODE_NONE);
232        mGridView.setChoiceMode(AbsListView.CHOICE_MODE_NONE);
233    }
234
235    @Override
236    public void onActivityCreated(Bundle savedInstanceState) {
237        super.onActivityCreated(savedInstanceState);
238
239        final Context context = getActivity();
240        final State state = getDisplayState(DirectoryFragment.this);
241
242        final RootInfo root = getArguments().getParcelable(EXTRA_ROOT);
243        final DocumentInfo doc = getArguments().getParcelable(EXTRA_DOC);
244
245        mAdapter = new DocumentsAdapter();
246        mType = getArguments().getInt(EXTRA_TYPE);
247        mStateKey = buildStateKey(root, doc);
248
249        if (mType == TYPE_RECENT_OPEN) {
250            // Hide titles when showing recents for picking images/videos
251            mHideGridTitles = MimePredicate.mimeMatches(
252                    MimePredicate.VISUAL_MIMES, state.acceptMimes);
253        } else {
254            mHideGridTitles = (doc != null) && doc.isGridTitlesHidden();
255        }
256
257        final ActivityManager am = (ActivityManager) context.getSystemService(
258                Context.ACTIVITY_SERVICE);
259        mSvelteRecents = am.isLowRamDevice() && (mType == TYPE_RECENT_OPEN);
260
261        mCallbacks = new LoaderCallbacks<DirectoryResult>() {
262            @Override
263            public Loader<DirectoryResult> onCreateLoader(int id, Bundle args) {
264                final String query = getArguments().getString(EXTRA_QUERY);
265
266                Uri contentsUri;
267                switch (mType) {
268                    case TYPE_NORMAL:
269                        contentsUri = DocumentsContract.buildChildDocumentsUri(
270                                doc.authority, doc.documentId);
271                        if (state.action == ACTION_MANAGE) {
272                            contentsUri = DocumentsContract.setManageMode(contentsUri);
273                        }
274                        return new DirectoryLoader(
275                                context, mType, root, doc, contentsUri, state.userSortOrder);
276                    case TYPE_SEARCH:
277                        contentsUri = DocumentsContract.buildSearchDocumentsUri(
278                                root.authority, root.rootId, query);
279                        if (state.action == ACTION_MANAGE) {
280                            contentsUri = DocumentsContract.setManageMode(contentsUri);
281                        }
282                        return new DirectoryLoader(
283                                context, mType, root, doc, contentsUri, state.userSortOrder);
284                    case TYPE_RECENT_OPEN:
285                        final RootsCache roots = DocumentsApplication.getRootsCache(context);
286                        return new RecentLoader(context, roots, state);
287                    default:
288                        throw new IllegalStateException("Unknown type " + mType);
289                }
290            }
291
292            @Override
293            public void onLoadFinished(Loader<DirectoryResult> loader, DirectoryResult result) {
294                if (!isAdded()) return;
295
296                mAdapter.swapResult(result);
297
298                // Push latest state up to UI
299                // TODO: if mode change was racing with us, don't overwrite it
300                if (result.mode != MODE_UNKNOWN) {
301                    state.derivedMode = result.mode;
302                }
303                state.derivedSortOrder = result.sortOrder;
304                ((DocumentsActivity) context).onStateChanged();
305
306                updateDisplayState();
307
308                // When launched into empty recents, show drawer
309                if (mType == TYPE_RECENT_OPEN && mAdapter.isEmpty() && !state.stackTouched) {
310                    ((DocumentsActivity) context).setRootsDrawerOpen(true);
311                }
312
313                // Restore any previous instance state
314                final SparseArray<Parcelable> container = state.dirState.remove(mStateKey);
315                if (container != null && !getArguments().getBoolean(EXTRA_IGNORE_STATE, false)) {
316                    getView().restoreHierarchyState(container);
317                } else if (mLastSortOrder != state.derivedSortOrder) {
318                    mListView.smoothScrollToPosition(0);
319                    mGridView.smoothScrollToPosition(0);
320                }
321
322                mLastSortOrder = state.derivedSortOrder;
323            }
324
325            @Override
326            public void onLoaderReset(Loader<DirectoryResult> loader) {
327                mAdapter.swapResult(null);
328            }
329        };
330
331        // Kick off loader at least once
332        getLoaderManager().restartLoader(mLoaderId, null, mCallbacks);
333
334        updateDisplayState();
335    }
336
337    @Override
338    public void onStop() {
339        super.onStop();
340
341        // Remember last scroll location
342        final SparseArray<Parcelable> container = new SparseArray<Parcelable>();
343        getView().saveHierarchyState(container);
344        final State state = getDisplayState(this);
345        state.dirState.put(mStateKey, container);
346    }
347
348    @Override
349    public void onResume() {
350        super.onResume();
351        updateDisplayState();
352    }
353
354    public void onDisplayStateChanged() {
355        updateDisplayState();
356    }
357
358    public void onUserSortOrderChanged() {
359        // Sort order change always triggers reload; we'll trigger state change
360        // on the flip side.
361        getLoaderManager().restartLoader(mLoaderId, null, mCallbacks);
362    }
363
364    public void onUserModeChanged() {
365        final ContentResolver resolver = getActivity().getContentResolver();
366        final State state = getDisplayState(this);
367
368        final RootInfo root = getArguments().getParcelable(EXTRA_ROOT);
369        final DocumentInfo doc = getArguments().getParcelable(EXTRA_DOC);
370
371        if (root != null && doc != null) {
372            final Uri stateUri = RecentsProvider.buildState(
373                    root.authority, root.rootId, doc.documentId);
374            final ContentValues values = new ContentValues();
375            values.put(StateColumns.MODE, state.userMode);
376
377            new AsyncTask<Void, Void, Void>() {
378                @Override
379                protected Void doInBackground(Void... params) {
380                    resolver.insert(stateUri, values);
381                    return null;
382                }
383            }.execute();
384        }
385
386        // Mode change is just visual change; no need to kick loader, and
387        // deliver change event immediately.
388        state.derivedMode = state.userMode;
389        ((DocumentsActivity) getActivity()).onStateChanged();
390
391        updateDisplayState();
392    }
393
394    private void updateDisplayState() {
395        final State state = getDisplayState(this);
396
397        if (mLastMode == state.derivedMode && mLastShowSize == state.showSize) return;
398        mLastMode = state.derivedMode;
399        mLastShowSize = state.showSize;
400
401        mListView.setVisibility(state.derivedMode == MODE_LIST ? View.VISIBLE : View.GONE);
402        mGridView.setVisibility(state.derivedMode == MODE_GRID ? View.VISIBLE : View.GONE);
403
404        final int choiceMode;
405        if (state.allowMultiple) {
406            choiceMode = ListView.CHOICE_MODE_MULTIPLE_MODAL;
407        } else {
408            choiceMode = ListView.CHOICE_MODE_NONE;
409        }
410
411        final int thumbSize;
412        if (state.derivedMode == MODE_GRID) {
413            thumbSize = getResources().getDimensionPixelSize(R.dimen.grid_width);
414            mListView.setAdapter(null);
415            mListView.setChoiceMode(ListView.CHOICE_MODE_NONE);
416            mGridView.setAdapter(mAdapter);
417            mGridView.setColumnWidth(getResources().getDimensionPixelSize(R.dimen.grid_width));
418            mGridView.setNumColumns(GridView.AUTO_FIT);
419            mGridView.setChoiceMode(choiceMode);
420            mCurrentView = mGridView;
421        } else if (state.derivedMode == MODE_LIST) {
422            thumbSize = getResources().getDimensionPixelSize(R.dimen.icon_size);
423            mGridView.setAdapter(null);
424            mGridView.setChoiceMode(ListView.CHOICE_MODE_NONE);
425            mListView.setAdapter(mAdapter);
426            mListView.setChoiceMode(choiceMode);
427            mCurrentView = mListView;
428        } else {
429            throw new IllegalStateException("Unknown state " + state.derivedMode);
430        }
431
432        mThumbSize = new Point(thumbSize, thumbSize);
433    }
434
435    private OnItemClickListener mItemListener = new OnItemClickListener() {
436        @Override
437        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
438            final Cursor cursor = mAdapter.getItem(position);
439            if (cursor != null) {
440                final String docMimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE);
441                final int docFlags = getCursorInt(cursor, Document.COLUMN_FLAGS);
442                if (isDocumentEnabled(docMimeType, docFlags)) {
443                    final DocumentInfo doc = DocumentInfo.fromDirectoryCursor(cursor);
444                    ((DocumentsActivity) getActivity()).onDocumentPicked(doc);
445                }
446            }
447        }
448    };
449
450    private MultiChoiceModeListener mMultiListener = new MultiChoiceModeListener() {
451        @Override
452        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
453            mode.getMenuInflater().inflate(R.menu.mode_directory, menu);
454            mode.setTitle(getResources()
455                    .getString(R.string.mode_selected_count, mCurrentView.getCheckedItemCount()));
456            return true;
457        }
458
459        @Override
460        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
461            final State state = getDisplayState(DirectoryFragment.this);
462
463            final MenuItem open = menu.findItem(R.id.menu_open);
464            final MenuItem share = menu.findItem(R.id.menu_share);
465            final MenuItem delete = menu.findItem(R.id.menu_delete);
466
467            final boolean manageMode = state.action == ACTION_MANAGE;
468            open.setVisible(!manageMode);
469            share.setVisible(manageMode);
470            delete.setVisible(manageMode);
471
472            return true;
473        }
474
475        @Override
476        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
477            final SparseBooleanArray checked = mCurrentView.getCheckedItemPositions();
478            final ArrayList<DocumentInfo> docs = Lists.newArrayList();
479            final int size = checked.size();
480            for (int i = 0; i < size; i++) {
481                if (checked.valueAt(i)) {
482                    final Cursor cursor = mAdapter.getItem(checked.keyAt(i));
483                    final DocumentInfo doc = DocumentInfo.fromDirectoryCursor(cursor);
484                    docs.add(doc);
485                }
486            }
487
488            final int id = item.getItemId();
489            if (id == R.id.menu_open) {
490                DocumentsActivity.get(DirectoryFragment.this).onDocumentsPicked(docs);
491                mode.finish();
492                return true;
493
494            } else if (id == R.id.menu_share) {
495                onShareDocuments(docs);
496                mode.finish();
497                return true;
498
499            } else if (id == R.id.menu_delete) {
500                onDeleteDocuments(docs);
501                mode.finish();
502                return true;
503
504            } else {
505                return false;
506            }
507        }
508
509        @Override
510        public void onDestroyActionMode(ActionMode mode) {
511            // ignored
512        }
513
514        @Override
515        public void onItemCheckedStateChanged(
516                ActionMode mode, int position, long id, boolean checked) {
517            if (checked) {
518                // Directories and footer items cannot be checked
519                boolean valid = false;
520
521                final Cursor cursor = mAdapter.getItem(position);
522                if (cursor != null) {
523                    final String docMimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE);
524                    final int docFlags = getCursorInt(cursor, Document.COLUMN_FLAGS);
525                    if (!Document.MIME_TYPE_DIR.equals(docMimeType)) {
526                        valid = isDocumentEnabled(docMimeType, docFlags);
527                    }
528                }
529
530                if (!valid) {
531                    mCurrentView.setItemChecked(position, false);
532                }
533            }
534
535            mode.setTitle(getResources()
536                    .getString(R.string.mode_selected_count, mCurrentView.getCheckedItemCount()));
537        }
538    };
539
540    private RecyclerListener mRecycleListener = new RecyclerListener() {
541        @Override
542        public void onMovedToScrapHeap(View view) {
543            final ImageView iconThumb = (ImageView) view.findViewById(R.id.icon_thumb);
544            if (iconThumb != null) {
545                final ThumbnailAsyncTask oldTask = (ThumbnailAsyncTask) iconThumb.getTag();
546                if (oldTask != null) {
547                    oldTask.preempt();
548                    iconThumb.setTag(null);
549                }
550            }
551        }
552    };
553
554    private void onShareDocuments(List<DocumentInfo> docs) {
555        Intent intent;
556        if (docs.size() == 1) {
557            final DocumentInfo doc = docs.get(0);
558
559            intent = new Intent(Intent.ACTION_SEND);
560            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
561            intent.addCategory(Intent.CATEGORY_DEFAULT);
562            intent.setType(doc.mimeType);
563            intent.putExtra(Intent.EXTRA_STREAM, doc.derivedUri);
564
565        } else if (docs.size() > 1) {
566            intent = new Intent(Intent.ACTION_SEND_MULTIPLE);
567            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
568            intent.addCategory(Intent.CATEGORY_DEFAULT);
569
570            final ArrayList<String> mimeTypes = Lists.newArrayList();
571            final ArrayList<Uri> uris = Lists.newArrayList();
572            for (DocumentInfo doc : docs) {
573                mimeTypes.add(doc.mimeType);
574                uris.add(doc.derivedUri);
575            }
576
577            intent.setType(findCommonMimeType(mimeTypes));
578            intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
579
580        } else {
581            return;
582        }
583
584        intent = Intent.createChooser(intent, getActivity().getText(R.string.share_via));
585        startActivity(intent);
586    }
587
588    private void onDeleteDocuments(List<DocumentInfo> docs) {
589        final Context context = getActivity();
590        final ContentResolver resolver = context.getContentResolver();
591
592        boolean hadTrouble = false;
593        for (DocumentInfo doc : docs) {
594            if (!doc.isDeleteSupported()) {
595                Log.w(TAG, "Skipping " + doc);
596                hadTrouble = true;
597                continue;
598            }
599
600            ContentProviderClient client = null;
601            try {
602                client = DocumentsApplication.acquireUnstableProviderOrThrow(
603                        resolver, doc.derivedUri.getAuthority());
604                DocumentsContract.deleteDocument(client, doc.derivedUri);
605            } catch (Exception e) {
606                Log.w(TAG, "Failed to delete " + doc);
607                hadTrouble = true;
608            } finally {
609                ContentProviderClient.releaseQuietly(client);
610            }
611        }
612
613        if (hadTrouble) {
614            Toast.makeText(context, R.string.toast_failed_delete, Toast.LENGTH_SHORT).show();
615        }
616    }
617
618    private static State getDisplayState(Fragment fragment) {
619        return ((DocumentsActivity) fragment.getActivity()).getDisplayState();
620    }
621
622    private static abstract class Footer {
623        private final int mItemViewType;
624
625        public Footer(int itemViewType) {
626            mItemViewType = itemViewType;
627        }
628
629        public abstract View getView(View convertView, ViewGroup parent);
630
631        public int getItemViewType() {
632            return mItemViewType;
633        }
634    }
635
636    private class LoadingFooter extends Footer {
637        public LoadingFooter() {
638            super(1);
639        }
640
641        @Override
642        public View getView(View convertView, ViewGroup parent) {
643            final Context context = parent.getContext();
644            final State state = getDisplayState(DirectoryFragment.this);
645
646            if (convertView == null) {
647                final LayoutInflater inflater = LayoutInflater.from(context);
648                if (state.derivedMode == MODE_LIST) {
649                    convertView = inflater.inflate(R.layout.item_loading_list, parent, false);
650                } else if (state.derivedMode == MODE_GRID) {
651                    convertView = inflater.inflate(R.layout.item_loading_grid, parent, false);
652                } else {
653                    throw new IllegalStateException();
654                }
655            }
656
657            return convertView;
658        }
659    }
660
661    private class MessageFooter extends Footer {
662        private final int mIcon;
663        private final String mMessage;
664
665        public MessageFooter(int itemViewType, int icon, String message) {
666            super(itemViewType);
667            mIcon = icon;
668            mMessage = message;
669        }
670
671        @Override
672        public View getView(View convertView, ViewGroup parent) {
673            final Context context = parent.getContext();
674            final State state = getDisplayState(DirectoryFragment.this);
675
676            if (convertView == null) {
677                final LayoutInflater inflater = LayoutInflater.from(context);
678                if (state.derivedMode == MODE_LIST) {
679                    convertView = inflater.inflate(R.layout.item_message_list, parent, false);
680                } else if (state.derivedMode == MODE_GRID) {
681                    convertView = inflater.inflate(R.layout.item_message_grid, parent, false);
682                } else {
683                    throw new IllegalStateException();
684                }
685            }
686
687            final ImageView icon = (ImageView) convertView.findViewById(android.R.id.icon);
688            final TextView title = (TextView) convertView.findViewById(android.R.id.title);
689            icon.setImageResource(mIcon);
690            title.setText(mMessage);
691            return convertView;
692        }
693    }
694
695    private class DocumentsAdapter extends BaseAdapter {
696        private Cursor mCursor;
697        private int mCursorCount;
698
699        private List<Footer> mFooters = Lists.newArrayList();
700
701        public void swapResult(DirectoryResult result) {
702            mCursor = result != null ? result.cursor : null;
703            mCursorCount = mCursor != null ? mCursor.getCount() : 0;
704
705            mFooters.clear();
706
707            final Bundle extras = mCursor != null ? mCursor.getExtras() : null;
708            if (extras != null) {
709                final String info = extras.getString(DocumentsContract.EXTRA_INFO);
710                if (info != null) {
711                    mFooters.add(new MessageFooter(2, R.drawable.ic_dialog_info, info));
712                }
713                final String error = extras.getString(DocumentsContract.EXTRA_ERROR);
714                if (error != null) {
715                    mFooters.add(new MessageFooter(3, R.drawable.ic_dialog_alert, error));
716                }
717                if (extras.getBoolean(DocumentsContract.EXTRA_LOADING, false)) {
718                    mFooters.add(new LoadingFooter());
719                }
720            }
721
722            if (result != null && result.exception != null) {
723                mFooters.add(new MessageFooter(
724                        3, R.drawable.ic_dialog_alert, getString(R.string.query_error)));
725            }
726
727            if (isEmpty()) {
728                mEmptyView.setVisibility(View.VISIBLE);
729            } else {
730                mEmptyView.setVisibility(View.GONE);
731            }
732
733            notifyDataSetChanged();
734        }
735
736        @Override
737        public View getView(int position, View convertView, ViewGroup parent) {
738            if (position < mCursorCount) {
739                return getDocumentView(position, convertView, parent);
740            } else {
741                position -= mCursorCount;
742                convertView = mFooters.get(position).getView(convertView, parent);
743                // Only the view itself is disabled; contents inside shouldn't
744                // be dimmed.
745                convertView.setEnabled(false);
746                return convertView;
747            }
748        }
749
750        private View getDocumentView(int position, View convertView, ViewGroup parent) {
751            final Context context = parent.getContext();
752            final State state = getDisplayState(DirectoryFragment.this);
753
754            final DocumentInfo doc = getArguments().getParcelable(EXTRA_DOC);
755
756            final RootsCache roots = DocumentsApplication.getRootsCache(context);
757            final ThumbnailCache thumbs = DocumentsApplication.getThumbnailsCache(
758                    context, mThumbSize);
759
760            if (convertView == null) {
761                final LayoutInflater inflater = LayoutInflater.from(context);
762                if (state.derivedMode == MODE_LIST) {
763                    convertView = inflater.inflate(R.layout.item_doc_list, parent, false);
764                } else if (state.derivedMode == MODE_GRID) {
765                    convertView = inflater.inflate(R.layout.item_doc_grid, parent, false);
766                } else {
767                    throw new IllegalStateException();
768                }
769            }
770
771            final Cursor cursor = getItem(position);
772
773            final String docAuthority = getCursorString(cursor, RootCursorWrapper.COLUMN_AUTHORITY);
774            final String docRootId = getCursorString(cursor, RootCursorWrapper.COLUMN_ROOT_ID);
775            final String docId = getCursorString(cursor, Document.COLUMN_DOCUMENT_ID);
776            final String docMimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE);
777            final String docDisplayName = getCursorString(cursor, Document.COLUMN_DISPLAY_NAME);
778            final long docLastModified = getCursorLong(cursor, Document.COLUMN_LAST_MODIFIED);
779            final int docIcon = getCursorInt(cursor, Document.COLUMN_ICON);
780            final int docFlags = getCursorInt(cursor, Document.COLUMN_FLAGS);
781            final String docSummary = getCursorString(cursor, Document.COLUMN_SUMMARY);
782            final long docSize = getCursorLong(cursor, Document.COLUMN_SIZE);
783
784            final View line1 = convertView.findViewById(R.id.line1);
785            final View line2 = convertView.findViewById(R.id.line2);
786
787            final ImageView iconMime = (ImageView) convertView.findViewById(R.id.icon_mime);
788            final ImageView iconThumb = (ImageView) convertView.findViewById(R.id.icon_thumb);
789            final TextView title = (TextView) convertView.findViewById(android.R.id.title);
790            final ImageView icon1 = (ImageView) convertView.findViewById(android.R.id.icon1);
791            final ImageView icon2 = (ImageView) convertView.findViewById(android.R.id.icon2);
792            final TextView summary = (TextView) convertView.findViewById(android.R.id.summary);
793            final TextView date = (TextView) convertView.findViewById(R.id.date);
794            final TextView size = (TextView) convertView.findViewById(R.id.size);
795
796            final ThumbnailAsyncTask oldTask = (ThumbnailAsyncTask) iconThumb.getTag();
797            if (oldTask != null) {
798                oldTask.preempt();
799                iconThumb.setTag(null);
800            }
801
802            iconMime.animate().cancel();
803            iconThumb.animate().cancel();
804
805            final boolean supportsThumbnail = (docFlags & Document.FLAG_SUPPORTS_THUMBNAIL) != 0;
806            final boolean allowThumbnail = (state.derivedMode == MODE_GRID)
807                    || MimePredicate.mimeMatches(MimePredicate.VISUAL_MIMES, docMimeType);
808            final boolean showThumbnail = supportsThumbnail && allowThumbnail && !mSvelteRecents;
809
810            final boolean enabled = isDocumentEnabled(docMimeType, docFlags);
811            final float iconAlpha = (state.derivedMode == MODE_LIST && !enabled) ? 0.5f : 1f;
812
813            boolean cacheHit = false;
814            if (showThumbnail) {
815                final Uri uri = DocumentsContract.buildDocumentUri(docAuthority, docId);
816                final Bitmap cachedResult = thumbs.get(uri);
817                if (cachedResult != null) {
818                    iconThumb.setImageBitmap(cachedResult);
819                    cacheHit = true;
820                } else {
821                    iconThumb.setImageDrawable(null);
822                    final ThumbnailAsyncTask task = new ThumbnailAsyncTask(
823                            uri, iconMime, iconThumb, mThumbSize, iconAlpha);
824                    iconThumb.setTag(task);
825                    ProviderExecutor.forAuthority(docAuthority).execute(task);
826                }
827            }
828
829            // Always throw MIME icon into place, even when a thumbnail is being
830            // loaded in background.
831            if (cacheHit) {
832                iconMime.setAlpha(0f);
833                iconMime.setImageDrawable(null);
834                iconThumb.setAlpha(1f);
835            } else {
836                iconMime.setAlpha(1f);
837                iconThumb.setAlpha(0f);
838                iconThumb.setImageDrawable(null);
839                if (docIcon != 0) {
840                    iconMime.setImageDrawable(
841                            IconUtils.loadPackageIcon(context, docAuthority, docIcon));
842                } else {
843                    iconMime.setImageDrawable(IconUtils.loadMimeIcon(
844                            context, docMimeType, docAuthority, docId, state.derivedMode));
845                }
846            }
847
848            boolean hasLine1 = false;
849            boolean hasLine2 = false;
850
851            final boolean hideTitle = (state.derivedMode == MODE_GRID) && mHideGridTitles;
852            if (!hideTitle) {
853                title.setText(docDisplayName);
854                hasLine1 = true;
855            }
856
857            Drawable iconDrawable = null;
858            if (mType == TYPE_RECENT_OPEN) {
859                // We've already had to enumerate roots before any results can
860                // be shown, so this will never block.
861                final RootInfo root = roots.getRootBlocking(docAuthority, docRootId);
862                if (state.derivedMode == MODE_GRID) {
863                    iconDrawable = root.loadGridIcon(context);
864                } else {
865                    iconDrawable = root.loadIcon(context);
866                }
867
868                if (summary != null) {
869                    final boolean alwaysShowSummary = getResources()
870                            .getBoolean(R.bool.always_show_summary);
871                    if (alwaysShowSummary) {
872                        summary.setText(root.getDirectoryString());
873                        summary.setVisibility(View.VISIBLE);
874                        hasLine2 = true;
875                    } else {
876                        if (iconDrawable != null && roots.isIconUniqueBlocking(root)) {
877                            // No summary needed if icon speaks for itself
878                            summary.setVisibility(View.INVISIBLE);
879                        } else {
880                            summary.setText(root.getDirectoryString());
881                            summary.setVisibility(View.VISIBLE);
882                            summary.setTextAlignment(TextView.TEXT_ALIGNMENT_TEXT_END);
883                            hasLine2 = true;
884                        }
885                    }
886                }
887            } else {
888                // Directories showing thumbnails in grid mode get a little icon
889                // hint to remind user they're a directory.
890                if (Document.MIME_TYPE_DIR.equals(docMimeType) && state.derivedMode == MODE_GRID
891                        && showThumbnail) {
892                    iconDrawable = IconUtils.applyTintAttr(context, R.drawable.ic_doc_folder,
893                            android.R.attr.textColorPrimaryInverse);
894                }
895
896                if (summary != null) {
897                    if (docSummary != null) {
898                        summary.setText(docSummary);
899                        summary.setVisibility(View.VISIBLE);
900                        hasLine2 = true;
901                    } else {
902                        summary.setVisibility(View.INVISIBLE);
903                    }
904                }
905            }
906
907            if (icon1 != null) icon1.setVisibility(View.GONE);
908            if (icon2 != null) icon2.setVisibility(View.GONE);
909
910            if (iconDrawable != null) {
911                if (hasLine1) {
912                    icon1.setVisibility(View.VISIBLE);
913                    icon1.setImageDrawable(iconDrawable);
914                } else {
915                    icon2.setVisibility(View.VISIBLE);
916                    icon2.setImageDrawable(iconDrawable);
917                }
918            }
919
920            if (docLastModified == -1) {
921                date.setText(null);
922            } else {
923                date.setText(formatTime(context, docLastModified));
924                hasLine2 = true;
925            }
926
927            if (state.showSize) {
928                size.setVisibility(View.VISIBLE);
929                if (Document.MIME_TYPE_DIR.equals(docMimeType) || docSize == -1) {
930                    size.setText(null);
931                } else {
932                    size.setText(Formatter.formatFileSize(context, docSize));
933                    hasLine2 = true;
934                }
935            } else {
936                size.setVisibility(View.GONE);
937            }
938
939            if (line1 != null) {
940                line1.setVisibility(hasLine1 ? View.VISIBLE : View.GONE);
941            }
942            if (line2 != null) {
943                line2.setVisibility(hasLine2 ? View.VISIBLE : View.GONE);
944            }
945
946            setEnabledRecursive(convertView, enabled);
947
948            iconMime.setAlpha(iconAlpha);
949            iconThumb.setAlpha(iconAlpha);
950            if (icon1 != null) icon1.setAlpha(iconAlpha);
951            if (icon2 != null) icon2.setAlpha(iconAlpha);
952
953            return convertView;
954        }
955
956        @Override
957        public int getCount() {
958            return mCursorCount + mFooters.size();
959        }
960
961        @Override
962        public Cursor getItem(int position) {
963            if (position < mCursorCount) {
964                mCursor.moveToPosition(position);
965                return mCursor;
966            } else {
967                return null;
968            }
969        }
970
971        @Override
972        public long getItemId(int position) {
973            return position;
974        }
975
976        @Override
977        public int getViewTypeCount() {
978            return 4;
979        }
980
981        @Override
982        public int getItemViewType(int position) {
983            if (position < mCursorCount) {
984                return 0;
985            } else {
986                position -= mCursorCount;
987                return mFooters.get(position).getItemViewType();
988            }
989        }
990    }
991
992    private static class ThumbnailAsyncTask extends AsyncTask<Uri, Void, Bitmap>
993            implements Preemptable {
994        private final Uri mUri;
995        private final ImageView mIconMime;
996        private final ImageView mIconThumb;
997        private final Point mThumbSize;
998        private final float mTargetAlpha;
999        private final CancellationSignal mSignal;
1000
1001        public ThumbnailAsyncTask(Uri uri, ImageView iconMime, ImageView iconThumb, Point thumbSize,
1002                float targetAlpha) {
1003            mUri = uri;
1004            mIconMime = iconMime;
1005            mIconThumb = iconThumb;
1006            mThumbSize = thumbSize;
1007            mTargetAlpha = targetAlpha;
1008            mSignal = new CancellationSignal();
1009        }
1010
1011        @Override
1012        public void preempt() {
1013            cancel(false);
1014            mSignal.cancel();
1015        }
1016
1017        @Override
1018        protected Bitmap doInBackground(Uri... params) {
1019            if (isCancelled()) return null;
1020
1021            final Context context = mIconThumb.getContext();
1022            final ContentResolver resolver = context.getContentResolver();
1023
1024            ContentProviderClient client = null;
1025            Bitmap result = null;
1026            try {
1027                client = DocumentsApplication.acquireUnstableProviderOrThrow(
1028                        resolver, mUri.getAuthority());
1029                result = DocumentsContract.getDocumentThumbnail(client, mUri, mThumbSize, mSignal);
1030                if (result != null) {
1031                    final ThumbnailCache thumbs = DocumentsApplication.getThumbnailsCache(
1032                            context, mThumbSize);
1033                    thumbs.put(mUri, result);
1034                }
1035            } catch (Exception e) {
1036                if (!(e instanceof OperationCanceledException)) {
1037                    Log.w(TAG, "Failed to load thumbnail for " + mUri + ": " + e);
1038                }
1039            } finally {
1040                ContentProviderClient.releaseQuietly(client);
1041            }
1042            return result;
1043        }
1044
1045        @Override
1046        protected void onPostExecute(Bitmap result) {
1047            if (mIconThumb.getTag() == this && result != null) {
1048                mIconThumb.setTag(null);
1049                mIconThumb.setImageBitmap(result);
1050
1051                mIconMime.setAlpha(mTargetAlpha);
1052                mIconMime.animate().alpha(0f).start();
1053                mIconThumb.setAlpha(0f);
1054                mIconThumb.animate().alpha(mTargetAlpha).start();
1055            }
1056        }
1057    }
1058
1059    private static String formatTime(Context context, long when) {
1060        // TODO: DateUtils should make this easier
1061        Time then = new Time();
1062        then.set(when);
1063        Time now = new Time();
1064        now.setToNow();
1065
1066        int flags = DateUtils.FORMAT_NO_NOON | DateUtils.FORMAT_NO_MIDNIGHT
1067                | DateUtils.FORMAT_ABBREV_ALL;
1068
1069        if (then.year != now.year) {
1070            flags |= DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_SHOW_DATE;
1071        } else if (then.yearDay != now.yearDay) {
1072            flags |= DateUtils.FORMAT_SHOW_DATE;
1073        } else {
1074            flags |= DateUtils.FORMAT_SHOW_TIME;
1075        }
1076
1077        return DateUtils.formatDateTime(context, when, flags);
1078    }
1079
1080    private String findCommonMimeType(List<String> mimeTypes) {
1081        String[] commonType = mimeTypes.get(0).split("/");
1082        if (commonType.length != 2) {
1083            return "*/*";
1084        }
1085
1086        for (int i = 1; i < mimeTypes.size(); i++) {
1087            String[] type = mimeTypes.get(i).split("/");
1088            if (type.length != 2) continue;
1089
1090            if (!commonType[1].equals(type[1])) {
1091                commonType[1] = "*";
1092            }
1093
1094            if (!commonType[0].equals(type[0])) {
1095                commonType[0] = "*";
1096                commonType[1] = "*";
1097                break;
1098            }
1099        }
1100
1101        return commonType[0] + "/" + commonType[1];
1102    }
1103
1104    private void setEnabledRecursive(View v, boolean enabled) {
1105        if (v == null) return;
1106        if (v.isEnabled() == enabled) return;
1107        v.setEnabled(enabled);
1108
1109        if (v instanceof ViewGroup) {
1110            final ViewGroup vg = (ViewGroup) v;
1111            for (int i = vg.getChildCount() - 1; i >= 0; i--) {
1112                setEnabledRecursive(vg.getChildAt(i), enabled);
1113            }
1114        }
1115    }
1116
1117    private boolean isDocumentEnabled(String docMimeType, int docFlags) {
1118        final State state = getDisplayState(DirectoryFragment.this);
1119
1120        // Directories are always enabled
1121        if (Document.MIME_TYPE_DIR.equals(docMimeType)) {
1122            return true;
1123        }
1124
1125        // Read-only files are disabled when creating
1126        if (state.action == ACTION_CREATE && (docFlags & Document.FLAG_SUPPORTS_WRITE) == 0) {
1127            return false;
1128        }
1129
1130        return MimePredicate.mimeMatches(state.acceptMimes, docMimeType);
1131    }
1132}
1133