BrowserSnapshotPage.java revision d3e4d5b4ffdf374b836ec9d4d3e315040c8c3779 
1/*
2 * Copyright (C) 2011 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 */
16package com.android.browser;
17
18import android.app.Fragment;
19import android.app.LoaderManager.LoaderCallbacks;
20import android.content.ContentResolver;
21import android.content.ContentUris;
22import android.content.Context;
23import android.content.CursorLoader;
24import android.content.Loader;
25import android.database.Cursor;
26import android.graphics.Bitmap;
27import android.graphics.BitmapFactory;
28import android.net.Uri;
29import android.os.Bundle;
30import android.view.ContextMenu;
31import android.view.ContextMenu.ContextMenuInfo;
32import android.view.LayoutInflater;
33import android.view.MenuInflater;
34import android.view.MenuItem;
35import android.view.View;
36import android.view.View.MeasureSpec;
37import android.view.ViewGroup;
38import android.widget.AdapterView;
39import android.widget.AdapterView.AdapterContextMenuInfo;
40import android.widget.AdapterView.OnItemClickListener;
41import android.widget.GridView;
42import android.widget.ImageView;
43import android.widget.ResourceCursorAdapter;
44import android.widget.TextView;
45
46import com.android.browser.CombinedBookmarkHistoryView.CombinedBookmarksCallbacks;
47import com.android.browser.provider.SnapshotProvider.Snapshots;
48
49import java.text.DateFormat;
50import java.util.Date;
51
52public class BrowserSnapshotPage extends Fragment implements
53        LoaderCallbacks<Cursor>, OnItemClickListener {
54
55    public static final String EXTRA_ANIMATE_ID = "animate_id";
56
57    private static final int LOADER_SNAPSHOTS = 1;
58    private static final String[] PROJECTION = new String[] {
59        Snapshots._ID,
60        Snapshots.TITLE,
61        "length(" + Snapshots.VIEWSTATE + ")",
62        Snapshots.THUMBNAIL,
63        Snapshots.FAVICON,
64        Snapshots.URL,
65        Snapshots.DATE_CREATED,
66    };
67    private static final int SNAPSHOT_TITLE = 1;
68    private static final int SNAPSHOT_VIEWSTATE_LENGTH = 2;
69    private static final int SNAPSHOT_THUMBNAIL = 3;
70    private static final int SNAPSHOT_FAVICON = 4;
71    private static final int SNAPSHOT_URL = 5;
72    private static final int SNAPSHOT_DATE_CREATED = 6;
73
74    GridView mGrid;
75    View mEmpty;
76    SnapshotAdapter mAdapter;
77    CombinedBookmarksCallbacks mCallback;
78
79    public static BrowserSnapshotPage newInstance(CombinedBookmarksCallbacks cb,
80            Bundle extras) {
81        BrowserSnapshotPage instance = new BrowserSnapshotPage();
82        instance.mCallback = cb;
83        instance.setArguments(extras);
84        return instance;
85    }
86
87    @Override
88    public View onCreateView(LayoutInflater inflater, ViewGroup container,
89            Bundle savedInstanceState) {
90        View view = inflater.inflate(R.layout.snapshots, container, false);
91        mEmpty = view.findViewById(android.R.id.empty);
92        mGrid = (GridView) view.findViewById(R.id.grid);
93        setupGrid(inflater);
94        getLoaderManager().initLoader(LOADER_SNAPSHOTS, null, this);
95        return view;
96    }
97
98    @Override
99    public void onDestroyView() {
100        super.onDestroyView();
101        getLoaderManager().destroyLoader(LOADER_SNAPSHOTS);
102        if (mAdapter != null) {
103            mAdapter.changeCursor(null);
104            mAdapter = null;
105        }
106    }
107
108    void setupGrid(LayoutInflater inflater) {
109        View item = inflater.inflate(R.layout.snapshot_item, mGrid, false);
110        int mspec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
111        item.measure(mspec, mspec);
112        int width = item.getMeasuredWidth();
113        mGrid.setColumnWidth(width);
114        mGrid.setOnItemClickListener(this);
115        mGrid.setOnCreateContextMenuListener(this);
116    }
117
118    @Override
119    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
120        if (id == LOADER_SNAPSHOTS) {
121            return new CursorLoader(getActivity(),
122                    Snapshots.CONTENT_URI, PROJECTION,
123                    null, null, Snapshots.DATE_CREATED + " DESC");
124        }
125        return null;
126    }
127
128    @Override
129    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
130        if (loader.getId() == LOADER_SNAPSHOTS) {
131            if (mAdapter == null) {
132                mAdapter = new SnapshotAdapter(getActivity(), data);
133                mGrid.setAdapter(mAdapter);
134            } else {
135                mAdapter.changeCursor(data);
136            }
137            boolean empty = mAdapter.isEmpty();
138            mGrid.setVisibility(empty ? View.GONE : View.VISIBLE);
139            mEmpty.setVisibility(empty ? View.VISIBLE : View.GONE);
140        }
141    }
142
143    @Override
144    public void onLoaderReset(Loader<Cursor> loader) {
145    }
146
147    @Override
148    public void onCreateContextMenu(ContextMenu menu, View v,
149            ContextMenuInfo menuInfo) {
150        MenuInflater inflater = getActivity().getMenuInflater();
151        inflater.inflate(R.menu.snapshots_context, menu);
152        // Create the header, re-use BookmarkItem (has the layout we want)
153        BookmarkItem header = new BookmarkItem(getActivity());
154        AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
155        populateBookmarkItem(mAdapter.getItem(info.position), header);
156        menu.setHeaderView(header);
157    }
158
159    private void populateBookmarkItem(Cursor cursor, BookmarkItem item) {
160        item.setName(cursor.getString(SNAPSHOT_TITLE));
161        item.setUrl(cursor.getString(SNAPSHOT_URL));
162        item.setFavicon(getBitmap(cursor, SNAPSHOT_FAVICON));
163    }
164
165    static Bitmap getBitmap(Cursor cursor, int columnIndex) {
166        byte[] data = cursor.getBlob(columnIndex);
167        if (data == null) {
168            return null;
169        }
170        return BitmapFactory.decodeByteArray(data, 0, data.length);
171    }
172
173    @Override
174    public boolean onContextItemSelected(MenuItem item) {
175        if (item.getItemId() == R.id.delete_context_menu_id) {
176            AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
177            deleteSnapshot(info.id);
178            return true;
179        }
180        return super.onContextItemSelected(item);
181    }
182
183    void deleteSnapshot(long id) {
184        final Uri uri = ContentUris.withAppendedId(Snapshots.CONTENT_URI, id);
185        final ContentResolver cr = getActivity().getContentResolver();
186        new Thread() {
187            @Override
188            public void run() {
189                cr.delete(uri, null, null);
190            }
191        }.start();
192
193    }
194
195    @Override
196    public void onItemClick(AdapterView<?> parent, View view, int position,
197            long id) {
198        mCallback.openSnapshot(id);
199    }
200
201    private static class SnapshotAdapter extends ResourceCursorAdapter {
202
203        public SnapshotAdapter(Context context, Cursor c) {
204            super(context, R.layout.snapshot_item, c, 0);
205        }
206
207        @Override
208        public void bindView(View view, Context context, Cursor cursor) {
209            ImageView thumbnail = (ImageView) view.findViewById(R.id.thumb);
210            byte[] thumbBlob = cursor.getBlob(SNAPSHOT_THUMBNAIL);
211            if (thumbBlob == null) {
212                thumbnail.setImageResource(R.drawable.browser_thumbnail);
213            } else {
214                Bitmap thumbBitmap = BitmapFactory.decodeByteArray(
215                        thumbBlob, 0, thumbBlob.length);
216                thumbnail.setImageBitmap(thumbBitmap);
217            }
218            TextView title = (TextView) view.findViewById(R.id.title);
219            title.setText(cursor.getString(SNAPSHOT_TITLE));
220            TextView size = (TextView) view.findViewById(R.id.size);
221            int stateLen = cursor.getInt(SNAPSHOT_VIEWSTATE_LENGTH);
222            size.setText(String.format("%.2fMB", stateLen / 1024f / 1024f));
223            long timestamp = cursor.getLong(SNAPSHOT_DATE_CREATED);
224            TextView date = (TextView) view.findViewById(R.id.date);
225            DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.SHORT);
226            date.setText(dateFormat.format(new Date(timestamp)));
227        }
228
229        @Override
230        public Cursor getItem(int position) {
231            return (Cursor) super.getItem(position);
232        }
233    }
234
235}
236