1/*
2 * Copyright (C) 2010 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.settings;
18
19import android.app.ActivityManager;
20import android.app.AlertDialog;
21import android.app.Dialog;
22import android.app.DialogFragment;
23import android.content.BroadcastReceiver;
24import android.content.ContentResolver;
25import android.content.DialogInterface;
26import android.content.IntentFilter;
27import android.content.pm.PackageItemInfo;
28import android.content.pm.ServiceInfo;
29import android.database.ContentObserver;
30import android.net.Uri;
31import android.os.Handler;
32import android.service.notification.NotificationListenerService;
33import android.util.Slog;
34import android.widget.ArrayAdapter;
35
36import android.app.ListFragment;
37import android.content.ComponentName;
38import android.content.Context;
39import android.content.Intent;
40import android.content.pm.PackageManager;
41import android.content.pm.ResolveInfo;
42import android.os.Bundle;
43import android.provider.Settings;
44import android.view.LayoutInflater;
45import android.view.View;
46import android.view.ViewGroup;
47import android.widget.CheckBox;
48import android.widget.ImageView;
49import android.widget.ListView;
50import android.widget.TextView;
51
52import java.util.HashSet;
53import java.util.List;
54
55public class NotificationAccessSettings extends ListFragment {
56    static final String TAG = NotificationAccessSettings.class.getSimpleName();
57    private static final boolean SHOW_PACKAGE_NAME = false;
58
59    private PackageManager mPM;
60    private ContentResolver mCR;
61
62    private final HashSet<ComponentName> mEnabledListeners = new HashSet<ComponentName>();
63    private ListenerListAdapter mList;
64
65    private final Uri ENABLED_NOTIFICATION_LISTENERS_URI
66            = Settings.Secure.getUriFor(Settings.Secure.ENABLED_NOTIFICATION_LISTENERS);
67
68    private final ContentObserver mSettingsObserver = new ContentObserver(new Handler()) {
69        @Override
70        public void onChange(boolean selfChange, Uri uri) {
71            updateList();
72        }
73    };
74
75    private final BroadcastReceiver mPackageReceiver = new BroadcastReceiver() {
76        @Override
77        public void onReceive(Context context, Intent intent) {
78            updateList();
79        }
80    };
81
82    public class ListenerWarningDialogFragment extends DialogFragment {
83        static final String KEY_COMPONENT = "c";
84        static final String KEY_LABEL = "l";
85
86        public ListenerWarningDialogFragment setListenerInfo(ComponentName cn, String label) {
87            Bundle args = new Bundle();
88            args.putString(KEY_COMPONENT, cn.flattenToString());
89            args.putString(KEY_LABEL, label);
90            setArguments(args);
91
92            return this;
93        }
94        @Override
95        public Dialog onCreateDialog(Bundle savedInstanceState) {
96            super.onCreate(savedInstanceState);
97            final Bundle args = getArguments();
98            final String label = args.getString(KEY_LABEL);
99            final ComponentName cn = ComponentName.unflattenFromString(args.getString(KEY_COMPONENT));
100
101            final String title = getResources().getString(
102                    R.string.notification_listener_security_warning_title, label);
103            final String summary = getResources().getString(
104                    R.string.notification_listener_security_warning_summary, label);
105            return new AlertDialog.Builder(getActivity())
106                    .setMessage(summary)
107                    .setTitle(title)
108                    .setIconAttribute(android.R.attr.alertDialogIcon)
109                    .setCancelable(true)
110                    .setPositiveButton(android.R.string.ok,
111                            new DialogInterface.OnClickListener() {
112                                public void onClick(DialogInterface dialog, int id) {
113                                    mEnabledListeners.add(cn);
114                                    saveEnabledListeners();
115                                }
116                            })
117                    .setNegativeButton(android.R.string.cancel,
118                            new DialogInterface.OnClickListener() {
119                                public void onClick(DialogInterface dialog, int id) {
120                                    // pass
121                                }
122                            })
123                    .create();
124        }
125    }
126
127    @Override
128    public void onCreate(Bundle icicle) {
129        super.onCreate(icicle);
130
131        mPM = getActivity().getPackageManager();
132        mCR = getActivity().getContentResolver();
133        mList = new ListenerListAdapter(getActivity());
134    }
135
136    @Override
137    public View onCreateView(LayoutInflater inflater, ViewGroup container,
138            Bundle savedInstanceState) {
139        return inflater.inflate(R.layout.notification_access_settings, container, false);
140    }
141
142    @Override
143    public void onResume() {
144        super.onResume();
145        updateList();
146
147        // listen for package changes
148        IntentFilter filter = new IntentFilter();
149        filter.addAction(Intent.ACTION_PACKAGE_ADDED);
150        filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
151        filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
152        filter.addAction(Intent.ACTION_PACKAGE_REPLACED);
153        filter.addDataScheme("package");
154        getActivity().registerReceiver(mPackageReceiver, filter);
155
156        mCR.registerContentObserver(ENABLED_NOTIFICATION_LISTENERS_URI, false, mSettingsObserver);
157    }
158
159    @Override
160    public void onPause() {
161        super.onPause();
162
163        getActivity().unregisterReceiver(mPackageReceiver);
164        mCR.unregisterContentObserver(mSettingsObserver);
165    }
166
167    void loadEnabledListeners() {
168        mEnabledListeners.clear();
169        final String flat = Settings.Secure.getString(mCR,
170                Settings.Secure.ENABLED_NOTIFICATION_LISTENERS);
171        if (flat != null && !"".equals(flat)) {
172            final String[] names = flat.split(":");
173            for (int i = 0; i < names.length; i++) {
174                final ComponentName cn = ComponentName.unflattenFromString(names[i]);
175                if (cn != null) {
176                    mEnabledListeners.add(cn);
177                }
178            }
179        }
180    }
181
182    void saveEnabledListeners() {
183        StringBuilder sb = null;
184        for (ComponentName cn : mEnabledListeners) {
185            if (sb == null) {
186                sb = new StringBuilder();
187            } else {
188                sb.append(':');
189            }
190            sb.append(cn.flattenToString());
191        }
192        Settings.Secure.putString(mCR,
193                Settings.Secure.ENABLED_NOTIFICATION_LISTENERS,
194                sb != null ? sb.toString() : "");
195    }
196
197    void updateList() {
198        loadEnabledListeners();
199
200        getListeners(mList, mPM);
201        mList.sort(new PackageItemInfo.DisplayNameComparator(mPM));
202
203        getListView().setAdapter(mList);
204    }
205
206    static int getListenersCount(PackageManager pm) {
207        return getListeners(null, pm);
208    }
209
210    private static int getListeners(ArrayAdapter<ServiceInfo> adapter, PackageManager pm) {
211        int listeners = 0;
212        if (adapter != null) {
213            adapter.clear();
214        }
215        final int user = ActivityManager.getCurrentUser();
216
217        List<ResolveInfo> installedServices = pm.queryIntentServicesAsUser(
218                new Intent(NotificationListenerService.SERVICE_INTERFACE),
219                PackageManager.GET_SERVICES | PackageManager.GET_META_DATA,
220                user);
221
222        for (int i = 0, count = installedServices.size(); i < count; i++) {
223            ResolveInfo resolveInfo = installedServices.get(i);
224            ServiceInfo info = resolveInfo.serviceInfo;
225
226            if (!android.Manifest.permission.BIND_NOTIFICATION_LISTENER_SERVICE.equals(
227                    info.permission)) {
228                Slog.w(TAG, "Skipping notification listener service "
229                        + info.packageName + "/" + info.name
230                        + ": it does not require the permission "
231                        + android.Manifest.permission.BIND_NOTIFICATION_LISTENER_SERVICE);
232                continue;
233            }
234            if (adapter != null) {
235                adapter.add(info);
236            }
237            listeners++;
238        }
239        return listeners;
240    }
241
242    boolean isListenerEnabled(ServiceInfo info) {
243        final ComponentName cn = new ComponentName(info.packageName, info.name);
244        return mEnabledListeners.contains(cn);
245    }
246
247    @Override
248    public void onListItemClick(ListView l, View v, int position, long id) {
249        ServiceInfo info = mList.getItem(position);
250        final ComponentName cn = new ComponentName(info.packageName, info.name);
251        if (mEnabledListeners.contains(cn)) {
252            // the simple version: disabling
253            mEnabledListeners.remove(cn);
254            saveEnabledListeners();
255        } else {
256            // show a scary dialog
257            new ListenerWarningDialogFragment()
258                .setListenerInfo(cn, info.loadLabel(mPM).toString())
259                .show(getFragmentManager(), "dialog");
260        }
261    }
262
263    static class ViewHolder {
264        ImageView icon;
265        TextView name;
266        CheckBox checkbox;
267        TextView description;
268    }
269
270    class ListenerListAdapter extends ArrayAdapter<ServiceInfo> {
271        final LayoutInflater mInflater;
272
273        ListenerListAdapter(Context context) {
274            super(context, 0, 0);
275            mInflater = (LayoutInflater)
276                    getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
277        }
278
279        public boolean hasStableIds() {
280            return true;
281        }
282
283        public long getItemId(int position) {
284            return position;
285        }
286
287        public View getView(int position, View convertView, ViewGroup parent) {
288            View v;
289            if (convertView == null) {
290                v = newView(parent);
291            } else {
292                v = convertView;
293            }
294            bindView(v, position);
295            return v;
296        }
297
298        public View newView(ViewGroup parent) {
299            View v = mInflater.inflate(R.layout.notification_listener_item, parent, false);
300            ViewHolder h = new ViewHolder();
301            h.icon = (ImageView) v.findViewById(R.id.icon);
302            h.name = (TextView) v.findViewById(R.id.name);
303            h.checkbox = (CheckBox) v.findViewById(R.id.checkbox);
304            h.description = (TextView) v.findViewById(R.id.description);
305            v.setTag(h);
306            return v;
307        }
308
309        public void bindView(View view, int position) {
310            ViewHolder vh = (ViewHolder) view.getTag();
311            ServiceInfo info = getItem(position);
312
313            vh.icon.setImageDrawable(info.loadIcon(mPM));
314            vh.name.setText(info.loadLabel(mPM));
315            if (SHOW_PACKAGE_NAME) {
316                vh.description.setText(info.packageName);
317                vh.description.setVisibility(View.VISIBLE);
318            } else {
319                vh.description.setVisibility(View.GONE);
320            }
321            vh.checkbox.setChecked(isListenerEnabled(info));
322        }
323    }
324}
325