BrowserSnapshotPage.java revision 2bc8042224be51966d748b870768ec1b376a1621 
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.provider.BrowserProvider2.Snapshots;
47
48import java.text.DateFormat;
49import java.util.Date;
50
51public class BrowserSnapshotPage extends Fragment implements
52        LoaderCallbacks<Cursor>, OnItemClickListener {
53
54    public static final String EXTRA_ANIMATE_ID = "animate_id";
55
56    private static final int LOADER_SNAPSHOTS = 1;
57    private static final String[] PROJECTION = new String[] {
58        Snapshots._ID,
59        Snapshots.TITLE,
60        "length(" + Snapshots.VIEWSTATE + ")",
61        Snapshots.THUMBNAIL,
62        Snapshots.FAVICON,
63        Snapshots.URL,
64    };
65    private static final int SNAPSHOT_TITLE = 1;
66    private static final int SNAPSHOT_VIEWSTATE_LENGTH = 2;
67    private static final int SNAPSHOT_THUMBNAIL = 3;
68    private static final int SNAPSHOT_FAVICON = 4;
69    private static final int SNAPSHOT_URL = 5;
70
71    GridView mGrid;
72    View mEmpty;
73    SnapshotAdapter mAdapter;
74    UiController mUiController;
75
76    public static BrowserSnapshotPage newInstance(UiController uiController,
77            Bundle extras) {
78        BrowserSnapshotPage instance = new BrowserSnapshotPage();
79        instance.mUiController = uiController;
80        instance.setArguments(extras);
81        return instance;
82    }
83
84    @Override
85    public View onCreateView(LayoutInflater inflater, ViewGroup container,
86            Bundle savedInstanceState) {
87        View view = inflater.inflate(R.layout.snapshots, container, false);
88        mEmpty = view.findViewById(android.R.id.empty);
89        mGrid = (GridView) view.findViewById(R.id.grid);
90        setupGrid(inflater);
91        getLoaderManager().initLoader(LOADER_SNAPSHOTS, null, this);
92        return view;
93    }
94
95    @Override
96    public void onDestroyView() {
97        super.onDestroyView();
98        getLoaderManager().destroyLoader(LOADER_SNAPSHOTS);
99        mAdapter.changeCursor(null);
100        mAdapter = null;
101    }
102
103    void setupGrid(LayoutInflater inflater) {
104        View item = inflater.inflate(R.layout.snapshot_item, mGrid, false);
105        int mspec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
106        item.measure(mspec, mspec);
107        int width = item.getMeasuredWidth();
108        mGrid.setColumnWidth(width);
109        mGrid.setOnItemClickListener(this);
110        mGrid.setOnCreateContextMenuListener(this);
111    }
112
113    @Override
114    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
115        if (id == LOADER_SNAPSHOTS) {
116            // TODO: Sort by date created
117            return new CursorLoader(getActivity(),
118                    Snapshots.CONTENT_URI, PROJECTION,
119                    null, null, null);
120        }
121        return null;
122    }
123
124    @Override
125    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
126        if (loader.getId() == LOADER_SNAPSHOTS) {
127            if (mAdapter == null) {
128                mAdapter = new SnapshotAdapter(getActivity(), data);
129                mGrid.setAdapter(mAdapter);
130            } else {
131                mAdapter.changeCursor(data);
132            }
133            boolean empty = mAdapter.isEmpty();
134            mGrid.setVisibility(empty ? View.GONE : View.VISIBLE);
135            mEmpty.setVisibility(empty ? View.VISIBLE : View.GONE);
136        }
137    }
138
139    @Override
140    public void onLoaderReset(Loader<Cursor> loader) {
141    }
142
143    @Override
144    public void onCreateContextMenu(ContextMenu menu, View v,
145            ContextMenuInfo menuInfo) {
146        MenuInflater inflater = getActivity().getMenuInflater();
147        inflater.inflate(R.menu.snapshots_context, menu);
148        // Create the header, re-use BookmarkItem (has the layout we want)
149        BookmarkItem header = new BookmarkItem(getActivity());
150        AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
151        populateBookmarkItem(mAdapter.getItem(info.position), header);
152        menu.setHeaderView(header);
153    }
154
155    private void populateBookmarkItem(Cursor cursor, BookmarkItem item) {
156        item.setName(cursor.getString(SNAPSHOT_TITLE));
157        item.setUrl(cursor.getString(SNAPSHOT_URL));
158        item.setFavicon(getBitmap(cursor, SNAPSHOT_FAVICON));
159    }
160
161    static Bitmap getBitmap(Cursor cursor, int columnIndex) {
162        byte[] data = cursor.getBlob(columnIndex);
163        if (data == null) {
164            return null;
165        }
166        return BitmapFactory.decodeByteArray(data, 0, data.length);
167    }
168
169    @Override
170    public boolean onContextItemSelected(MenuItem item) {
171        if (item.getItemId() == R.id.delete_context_menu_id) {
172            AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
173            deleteSnapshot(info.id);
174            return true;
175        }
176        return super.onContextItemSelected(item);
177    }
178
179    void deleteSnapshot(long id) {
180        final Uri uri = ContentUris.withAppendedId(Snapshots.CONTENT_URI, id);
181        final ContentResolver cr = getActivity().getContentResolver();
182        new Thread() {
183            @Override
184            public void run() {
185                cr.delete(uri, null, null);
186            }
187        }.start();
188
189    }
190
191    @Override
192    public void onItemClick(AdapterView<?> parent, View view, int position,
193            long id) {
194        mUiController.removeComboView();
195        mUiController.createNewSnapshotTab(id, true);
196    }
197
198    private static class SnapshotAdapter extends ResourceCursorAdapter {
199
200        public SnapshotAdapter(Context context, Cursor c) {
201            super(context, R.layout.snapshot_item, c, 0);
202        }
203
204        @Override
205        public void bindView(View view, Context context, Cursor cursor) {
206            ImageView thumbnail = (ImageView) view.findViewById(R.id.thumb);
207            byte[] thumbBlob = cursor.getBlob(SNAPSHOT_THUMBNAIL);
208            if (thumbBlob == null) {
209                thumbnail.setImageResource(R.drawable.browser_thumbnail);
210            } else {
211                Bitmap thumbBitmap = BitmapFactory.decodeByteArray(
212                        thumbBlob, 0, thumbBlob.length);
213                thumbnail.setImageBitmap(thumbBitmap);
214            }
215            TextView title = (TextView) view.findViewById(R.id.title);
216            title.setText(cursor.getString(SNAPSHOT_TITLE));
217            TextView size = (TextView) view.findViewById(R.id.size);
218            int stateLen = cursor.getInt(SNAPSHOT_VIEWSTATE_LENGTH);
219            size.setText(String.format("%.1fMB", stateLen / 1024f / 1024f));
220            // We don't actually have the date in the database yet
221            // Use the current date as a placeholder
222            TextView date = (TextView) view.findViewById(R.id.date);
223            DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.SHORT);
224            date.setText(dateFormat.format(new Date()));
225        }
226
227        @Override
228        public Cursor getItem(int position) {
229            return (Cursor) super.getItem(position);
230        }
231    }
232
233}
234