NotificationListenerActivity.java revision f715fd998b172c4e8658715a26a41c69144380be 
1/*
2 * Copyright (C) 2014 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.example.notificationlistener;
17
18import android.app.AlertDialog;
19import android.app.ListActivity;
20import android.content.BroadcastReceiver;
21import android.content.Context;
22import android.content.DialogInterface;
23import android.content.Intent;
24import android.content.IntentFilter;
25import android.os.Bundle;
26import android.provider.Settings.Secure;
27import android.service.notification.StatusBarNotification;
28import android.support.v4.content.LocalBroadcastManager;
29import android.util.Log;
30import android.view.View;
31import android.view.ViewGroup;
32import android.widget.BaseAdapter;
33import android.widget.Button;
34import android.widget.FrameLayout;
35import android.widget.TextView;
36
37import java.util.HashMap;
38import java.util.HashSet;
39import java.util.List;
40
41public class NotificationListenerActivity extends ListActivity {
42    private static final String LISTENER_PATH = "com.android.example.notificationlistener/" +
43            "com.android.example.notificationlistener.Listener";
44    private static final String TAG = "NotificationListenerActivity";
45
46    private Button mLaunchButton;
47    private TextView mEmptyText;
48    private StatusAdaptor mStatusAdaptor;
49    private final BroadcastReceiver mRefreshListener = new BroadcastReceiver() {
50        @Override
51        public void onReceive(Context context, Intent intent) {
52            Log.i(TAG, "update tickle");
53            updateList(intent.getStringExtra(Listener.EXTRA_KEY));
54        }
55    };
56
57    @Override
58    public void onCreate(Bundle savedInstanceState) {
59        super.onCreate(savedInstanceState);
60        setTitle(R.string.long_app_name);
61        setContentView(R.layout.main);
62        mLaunchButton = (Button) findViewById(R.id.launch_settings);
63        mEmptyText = (TextView) findViewById(android.R.id.empty);
64        mStatusAdaptor = new StatusAdaptor(this);
65        setListAdapter(mStatusAdaptor);
66    }
67
68    @Override
69    protected void onStop() {
70        LocalBroadcastManager.getInstance(this).unregisterReceiver(mRefreshListener);
71        super.onStop();
72    }
73
74    @Override
75    public void onStart() {
76        super.onStart();
77        final IntentFilter intentFilter = new IntentFilter(Listener.ACTION_REFRESH);
78        LocalBroadcastManager.getInstance(this).registerReceiver(mRefreshListener, intentFilter);
79        updateList(null);
80    }
81
82    @Override
83    public void onResume() {
84        super.onResume();
85        checkEnabled();
86    }
87
88    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
89        checkEnabled();
90    }
91
92    private void checkEnabled() {
93        String listeners = Secure.getString(getContentResolver(),
94                "enabled_notification_listeners");
95        if (listeners != null && listeners.contains(LISTENER_PATH)) {
96            mLaunchButton.setText(R.string.launch_to_disable);
97            mEmptyText.setText(R.string.waiting_for_content);
98        } else {
99            mLaunchButton.setText(R.string.launch_to_enable);
100            mEmptyText.setText(R.string.nothing_to_see);
101            AlertDialog.Builder builder = new AlertDialog.Builder(this);
102            builder.setMessage(R.string.explanation)
103                    .setTitle(R.string.disabled);
104            builder.setPositiveButton(R.string.enable_it, new DialogInterface.OnClickListener() {
105                public void onClick(DialogInterface dialog, int id) {
106                    launchSettings(null);
107                }
108            });
109            builder.setNegativeButton(R.string.cancel, null);
110            builder.create().show();
111        }
112    }
113
114    public void launchSettings(View v) {
115        startActivityForResult(
116                new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS"), 0);
117    }
118
119    public void dismiss(View v) {
120        Log.d(TAG, "clicked dismiss ");
121        Object tag = v.getTag();
122        if (tag instanceof StatusBarNotification) {
123            StatusBarNotification sbn = (StatusBarNotification) tag;
124            Log.d(TAG, "  on " + sbn.getKey());
125            LocalBroadcastManager.getInstance(this).
126                    sendBroadcast(new Intent(Listener.ACTION_DISMISS)
127                            .putExtra(Listener.EXTRA_KEY, sbn.getKey()));
128        }
129    }
130
131    public void launch(View v) {
132        Log.d(TAG, "clicked launch");
133        Object tag = v.getTag();
134        if (tag instanceof StatusBarNotification) {
135            StatusBarNotification sbn = (StatusBarNotification) tag;
136            Log.d(TAG, "  on " + sbn.getKey());
137            LocalBroadcastManager.getInstance(this).
138                    sendBroadcast(new Intent(Listener.ACTION_LAUNCH)
139                            .putExtra(Listener.EXTRA_KEY, sbn.getKey()));
140        }
141    }
142
143    private void updateList(String key) {
144        if (mStatusAdaptor.requiresInitialization()) {
145            final List<StatusBarNotification> notifications = Listener.getNotifications();
146            if (notifications != null) {
147                mStatusAdaptor.init(notifications);
148            }
149        }
150        mStatusAdaptor.update(key);
151    }
152
153    private class StatusAdaptor extends BaseAdapter {
154        private final Context mContext;
155        private List<StatusBarNotification> mNotifications;
156        private HashMap<String, Long> mKeyToId;
157        private HashSet<String> mKeys;
158        private long mNextId;
159        private HashMap<String, View> mRecycledViews;
160        private String mUpdateKey;
161
162        public StatusAdaptor(Context context) {
163            mContext = context;
164            mKeyToId = new HashMap<String, Long>();
165            mKeys = new HashSet<String>();
166            mNextId = 0;
167            mRecycledViews = new HashMap<String, View>();
168        }
169
170        @Override
171        public int getCount() {
172            return mNotifications == null ? 0 : mNotifications.size();
173        }
174
175        @Override
176        public Object getItem(int position) {
177            return mNotifications.get(position);
178        }
179
180        @Override
181        public boolean hasStableIds() {
182            return true;
183        }
184
185        @Override
186        public long getItemId(int position) {
187            final StatusBarNotification sbn = mNotifications.get(position);
188            final String key = sbn.getKey();
189            if (!mKeyToId.containsKey(key)) {
190                mKeyToId.put(key, mNextId);
191                mNextId ++;
192            }
193            return mKeyToId.get(key);
194        }
195
196        @Override
197        public View getView(int position, View view, ViewGroup list) {
198            if (view == null) {
199                view = View.inflate(mContext, R.layout.item, null);
200            }
201            FrameLayout container = (FrameLayout) view.findViewById(R.id.remote_view);
202            View dismiss = view.findViewById(R.id.dismiss);
203            StatusBarNotification sbn = mNotifications.get(position);
204            View child;
205            if (container.getTag() instanceof StatusBarNotification &&
206                    container.getChildCount() > 0) {
207                // recycle the view
208                StatusBarNotification old = (StatusBarNotification) container.getTag();
209                if (sbn.getKey().equals(mUpdateKey)) {
210                    //this view is out of date, discard it
211                    mUpdateKey = null;
212                } else {
213                    View content = container.getChildAt(0);
214                    container.removeView(content);
215                    mRecycledViews.put(old.getKey(), content);
216                }
217            }
218            child = mRecycledViews.get(sbn.getKey());
219            if (child == null) {
220                child = sbn.getNotification().contentView.apply(mContext, null);
221            }
222            container.setTag(sbn);
223            container.removeAllViews();
224            container.addView(child);
225            dismiss.setVisibility(sbn.isClearable() ? View.VISIBLE : View.GONE);
226            dismiss.setTag(sbn);
227            return view;
228        }
229
230        public void update(String key) {
231            if (mNotifications != null) {
232                synchronized (mNotifications) {
233                    mKeys.clear();
234                    for (int i = 0; i < mNotifications.size(); i++) {
235                        mKeys.add(mNotifications.get(i).getKey());
236                    }
237                    mKeyToId.keySet().retainAll(mKeys);
238                }
239                if (key == null) {
240                    mRecycledViews.clear();
241                } else {
242                    mUpdateKey = key;
243                    mRecycledViews.remove(key);
244                }
245                Log.d(TAG, "notifyDataSetChanged");
246                notifyDataSetChanged();
247            } else {
248                Log.d(TAG, "missed and update");
249            }
250        }
251
252        public boolean requiresInitialization() {
253            return mNotifications == null;
254        }
255
256        public void init(List<StatusBarNotification> notifications) {
257            mNotifications = notifications;
258        }
259    }
260}
261