MediaRouteChooserDialog.java revision 2ef36d857302c5cd738c7c8bdec53d31feebebba 
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 android.support.v7.app;
18
19import android.app.Dialog;
20import android.content.Context;
21import android.os.Bundle;
22import android.support.v7.media.MediaRouter;
23import android.support.v7.media.MediaRouteSelector;
24import android.support.v7.mediarouter.R;
25import android.text.TextUtils;
26import android.view.LayoutInflater;
27import android.view.View;
28import android.view.ViewGroup;
29import android.view.Window;
30import android.widget.AdapterView;
31import android.widget.ArrayAdapter;
32import android.widget.ListView;
33import android.widget.TextView;
34
35import java.util.Comparator;
36import java.util.List;
37
38/**
39 * This class implements the route chooser dialog for {@link MediaRouter}.
40 * <p>
41 * This dialog allows the user to choose a route that matches a given selector.
42 * </p>
43 *
44 * @see MediaRouteButton
45 * @see MediaRouteActionProvider
46 */
47public class MediaRouteChooserDialog extends Dialog {
48    private final MediaRouter mRouter;
49    private final MediaRouterCallback mCallback;
50
51    private MediaRouteSelector mSelector = MediaRouteSelector.EMPTY;
52    private RouteAdapter mAdapter;
53    private ListView mListView;
54    private boolean mAttachedToWindow;
55
56    public MediaRouteChooserDialog(Context context) {
57        this(context, 0);
58    }
59
60    public MediaRouteChooserDialog(Context context, int theme) {
61        super(MediaRouterThemeHelper.createThemedContext(context), theme);
62        context = getContext();
63
64        mRouter = MediaRouter.getInstance(context);
65        mCallback = new MediaRouterCallback();
66    }
67
68    /**
69     * Gets the media route selector for filtering the routes that the user can select.
70     *
71     * @return The selector, never null.
72     */
73    public MediaRouteSelector getRouteSelector() {
74        return mSelector;
75    }
76
77    /**
78     * Sets the media route selector for filtering the routes that the user can select.
79     *
80     * @param selector The selector, must not be null.
81     */
82    public void setRouteSelector(MediaRouteSelector selector) {
83        if (selector == null) {
84            throw new IllegalArgumentException("selector must not be null");
85        }
86
87        if (!mSelector.equals(selector)) {
88            mSelector = selector;
89
90            if (mAttachedToWindow) {
91                mRouter.removeCallback(mCallback);
92                mRouter.addCallback(selector, mCallback);
93            }
94
95            refreshRoutes();
96        }
97    }
98
99    @Override
100    protected void onCreate(Bundle savedInstanceState) {
101        super.onCreate(savedInstanceState);
102
103        getWindow().requestFeature(Window.FEATURE_LEFT_ICON);
104
105        setContentView(R.layout.media_route_chooser_dialog);
106        setTitle(R.string.media_route_chooser_title);
107
108        // Must be called after setContentView.
109        getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,
110                MediaRouterThemeHelper.getThemeResource(
111                        getContext(), R.attr.mediaRouteOffDrawable));
112
113        mAdapter = new RouteAdapter(getContext());
114        mListView = (ListView)findViewById(R.id.media_route_list);
115        mListView.setAdapter(mAdapter);
116        mListView.setOnItemClickListener(mAdapter);
117    }
118
119    @Override
120    public void onAttachedToWindow() {
121        super.onAttachedToWindow();
122
123        mAttachedToWindow = true;
124        mRouter.addCallback(mSelector, mCallback, MediaRouter.CALLBACK_FLAG_ACTIVE_SCAN);
125        refreshRoutes();
126    }
127
128    @Override
129    public void onDetachedFromWindow() {
130        mAttachedToWindow = false;
131        mRouter.removeCallback(mCallback);
132
133        super.onDetachedFromWindow();
134    }
135
136    private void refreshRoutes() {
137        if (mAttachedToWindow) {
138            mAdapter.update();
139        }
140    }
141
142    private final class RouteAdapter extends ArrayAdapter<MediaRouter.RouteInfo>
143            implements ListView.OnItemClickListener {
144        private final LayoutInflater mInflater;
145
146        public RouteAdapter(Context context) {
147            super(context, 0);
148            mInflater = LayoutInflater.from(context);
149        }
150
151        public void update() {
152            clear();
153            final List<MediaRouter.RouteInfo> routes = mRouter.getRoutes();
154            final int count = routes.size();
155            for (int i = 0; i < count; i++) {
156                MediaRouter.RouteInfo route = routes.get(i);
157                if (!route.isDefault() && route.matchesSelector(mSelector)) {
158                    add(route);
159                }
160            }
161            sort(RouteComparator.sInstance);
162            notifyDataSetChanged();
163        }
164
165        @Override
166        public boolean areAllItemsEnabled() {
167            return false;
168        }
169
170        @Override
171        public boolean isEnabled(int position) {
172            return getItem(position).isEnabled();
173        }
174
175        @Override
176        public View getView(int position, View convertView, ViewGroup parent) {
177            View view = convertView;
178            if (view == null) {
179                view = mInflater.inflate(R.layout.media_route_list_item, parent, false);
180            }
181            MediaRouter.RouteInfo route = getItem(position);
182            TextView text1 = (TextView)view.findViewById(android.R.id.text1);
183            TextView text2 = (TextView)view.findViewById(android.R.id.text2);
184            text1.setText(route.getName());
185            String description = route.getDescription();
186            if (TextUtils.isEmpty(description)) {
187                text2.setVisibility(View.GONE);
188                text2.setText("");
189            } else {
190                text2.setVisibility(View.VISIBLE);
191                text2.setText(description);
192            }
193            view.setEnabled(route.isEnabled());
194            return view;
195        }
196
197        @Override
198        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
199            MediaRouter.RouteInfo route = getItem(position);
200            if (route.isEnabled()) {
201                route.select();
202                dismiss();
203            }
204        }
205    }
206
207    private final class MediaRouterCallback extends MediaRouter.Callback {
208        @Override
209        public void onRouteAdded(MediaRouter router, MediaRouter.RouteInfo info) {
210            refreshRoutes();
211        }
212
213        @Override
214        public void onRouteRemoved(MediaRouter router, MediaRouter.RouteInfo info) {
215            refreshRoutes();
216        }
217
218        @Override
219        public void onRouteChanged(MediaRouter router, MediaRouter.RouteInfo info) {
220            refreshRoutes();
221        }
222
223        @Override
224        public void onRouteSelected(MediaRouter router, MediaRouter.RouteInfo route) {
225            dismiss();
226        }
227    }
228
229    private static final class RouteComparator implements Comparator<MediaRouter.RouteInfo> {
230        public static final RouteComparator sInstance = new RouteComparator();
231
232        @Override
233        public int compare(MediaRouter.RouteInfo lhs, MediaRouter.RouteInfo rhs) {
234            return lhs.getName().compareTo(rhs.getName());
235        }
236    }
237}
238