BluetoothA2dp.java revision 081f58abb7ceb702fdb0b65ff0e0ff70dd265a30 
1/*
2 * Copyright (C) 2008 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.bluetooth;
18
19import android.annotation.SdkConstant;
20import android.annotation.SdkConstant.SdkConstantType;
21import android.server.BluetoothA2dpService;
22import android.content.Context;
23import android.os.ServiceManager;
24import android.os.RemoteException;
25import android.os.IBinder;
26import android.util.Log;
27
28import java.util.Arrays;
29import java.util.Collections;
30import java.util.Set;
31import java.util.HashSet;
32
33/**
34 * Public API for controlling the Bluetooth A2DP Profile Service.
35 *
36 * BluetoothA2dp is a proxy object for controlling the Bluetooth A2DP
37 * Service via IPC.
38 *
39 * Creating a BluetoothA2dp object will initiate a binding with the
40 * BluetoothHeadset service. Users of this object should call close() when they
41 * are finished, so that this proxy object can unbind from the service.
42 *
43 * Currently the BluetoothA2dp service runs in the system server and this
44 * proxy object will be immediately bound to the service on construction.
45 *
46 * Currently this class provides methods to connect to A2DP audio sinks.
47 *
48 * @hide
49 */
50public final class BluetoothA2dp {
51    private static final String TAG = "BluetoothA2dp";
52    private static final boolean DBG = false;
53
54    /** int extra for ACTION_SINK_STATE_CHANGED */
55    public static final String EXTRA_SINK_STATE =
56        "android.bluetooth.a2dp.extra.SINK_STATE";
57    /** int extra for ACTION_SINK_STATE_CHANGED */
58    public static final String EXTRA_PREVIOUS_SINK_STATE =
59        "android.bluetooth.a2dp.extra.PREVIOUS_SINK_STATE";
60
61    /** Indicates the state of an A2DP audio sink has changed.
62     * This intent will always contain EXTRA_SINK_STATE,
63     * EXTRA_PREVIOUS_SINK_STATE and BluetoothDevice.EXTRA_DEVICE
64     * extras.
65     */
66    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
67    public static final String ACTION_SINK_STATE_CHANGED =
68        "android.bluetooth.a2dp.action.SINK_STATE_CHANGED";
69
70    public static final int STATE_DISCONNECTED = 0;
71    public static final int STATE_CONNECTING   = 1;
72    public static final int STATE_CONNECTED    = 2;
73    public static final int STATE_DISCONNECTING = 3;
74    /** Playing implies connected */
75    public static final int STATE_PLAYING    = 4;
76
77    /** Default priority for a2dp devices that should allow incoming
78     * connections */
79    public static final int PRIORITY_AUTO = 100;
80    /** Default priority for a2dp devices that should not allow incoming
81     * connections */
82    public static final int PRIORITY_OFF = 0;
83
84    private final IBluetoothA2dp mService;
85    private final Context mContext;
86
87    /**
88     * Create a BluetoothA2dp proxy object for interacting with the local
89     * Bluetooth A2DP service.
90     * @param c Context
91     */
92    public BluetoothA2dp(Context c) {
93        mContext = c;
94
95        IBinder b = ServiceManager.getService(BluetoothA2dpService.BLUETOOTH_A2DP_SERVICE);
96        if (b != null) {
97            mService = IBluetoothA2dp.Stub.asInterface(b);
98        } else {
99            Log.w(TAG, "Bluetooth A2DP service not available!");
100
101            // Instead of throwing an exception which prevents people from going
102            // into Wireless settings in the emulator. Let it crash later when it is actually used.
103            mService = null;
104        }
105    }
106
107    /** Initiate a connection to an A2DP sink.
108     *  Listen for SINK_STATE_CHANGED_ACTION to find out when the
109     *  connection is completed.
110     *  @param device Remote BT device.
111     *  @return false on immediate error, true otherwise
112     *  @hide
113     */
114    public boolean connectSink(BluetoothDevice device) {
115        if (DBG) log("connectSink(" + device + ")");
116        try {
117            return mService.connectSink(device);
118        } catch (RemoteException e) {
119            Log.e(TAG, "", e);
120            return false;
121        }
122    }
123
124    /** Initiate disconnect from an A2DP sink.
125     *  Listen for SINK_STATE_CHANGED_ACTION to find out when
126     *  disconnect is completed.
127     *  @param device Remote BT device.
128     *  @return false on immediate error, true otherwise
129     *  @hide
130     */
131    public boolean disconnectSink(BluetoothDevice device) {
132        if (DBG) log("disconnectSink(" + device + ")");
133        try {
134            return mService.disconnectSink(device);
135        } catch (RemoteException e) {
136            Log.e(TAG, "", e);
137            return false;
138        }
139    }
140
141    /** Initiate suspend from an A2DP sink.
142     *  Listen for SINK_STATE_CHANGED_ACTION to find out when
143     *  suspend is completed.
144     *  @param device Remote BT device.
145     *  @return false on immediate error, true otherwise
146     *  @hide
147     */
148    public boolean suspendSink(BluetoothDevice device) {
149        try {
150            return mService.suspendSink(device);
151        } catch (RemoteException e) {
152            Log.e(TAG, "", e);
153            return false;
154        }
155    }
156
157    /** Initiate resume from an suspended A2DP sink.
158     *  Listen for SINK_STATE_CHANGED_ACTION to find out when
159     *  resume is completed.
160     *  @param device Remote BT device.
161     *  @return false on immediate error, true otherwise
162     *  @hide
163     */
164    public boolean resumeSink(BluetoothDevice device) {
165        try {
166            return mService.resumeSink(device);
167        } catch (RemoteException e) {
168            Log.e(TAG, "", e);
169            return false;
170        }
171    }
172
173    /** Check if a specified A2DP sink is connected.
174     *  @param device Remote BT device.
175     *  @return True if connected (or playing), false otherwise and on error.
176     *  @hide
177     */
178    public boolean isSinkConnected(BluetoothDevice device) {
179        if (DBG) log("isSinkConnected(" + device + ")");
180        int state = getSinkState(device);
181        return state == STATE_CONNECTED || state == STATE_PLAYING;
182    }
183
184    /** Check if any A2DP sink is connected.
185     * @return a unmodifiable set of connected A2DP sinks, or null on error.
186     * @hide
187     */
188    public Set<BluetoothDevice> getConnectedSinks() {
189        if (DBG) log("getConnectedSinks()");
190        try {
191            return Collections.unmodifiableSet(
192                    new HashSet<BluetoothDevice>(Arrays.asList(mService.getConnectedSinks())));
193        } catch (RemoteException e) {
194            Log.e(TAG, "", e);
195            return null;
196        }
197    }
198
199    /** Get the state of an A2DP sink
200     *  @param device Remote BT device.
201     *  @return State code, one of STATE_
202     *  @hide
203     */
204    public int getSinkState(BluetoothDevice device) {
205        if (DBG) log("getSinkState(" + device + ")");
206        try {
207            return mService.getSinkState(device);
208        } catch (RemoteException e) {
209            Log.e(TAG, "", e);
210            return BluetoothA2dp.STATE_DISCONNECTED;
211        }
212    }
213
214    /**
215     * Set priority of a2dp sink.
216     * Priority is a non-negative integer. By default paired sinks will have
217     * a priority of PRIORITY_AUTO, and unpaired headset PRIORITY_NONE (0).
218     * Sinks with priority greater than zero will accept incoming connections
219     * (if no sink is currently connected).
220     * Priority for unpaired sink must be PRIORITY_NONE.
221     * @param device Paired sink
222     * @param priority Integer priority, for example PRIORITY_AUTO or
223     *                 PRIORITY_NONE
224     * @return true if priority is set, false on error
225     */
226    public boolean setSinkPriority(BluetoothDevice device, int priority) {
227        if (DBG) log("setSinkPriority(" + device + ", " + priority + ")");
228        try {
229            return mService.setSinkPriority(device, priority);
230        } catch (RemoteException e) {
231            Log.e(TAG, "", e);
232            return false;
233        }
234    }
235
236    /**
237     * Get priority of a2dp sink.
238     * @param device Sink
239     * @return non-negative priority, or negative error code on error.
240     */
241    public int getSinkPriority(BluetoothDevice device) {
242        if (DBG) log("getSinkPriority(" + device + ")");
243        try {
244            return mService.getSinkPriority(device);
245        } catch (RemoteException e) {
246            Log.e(TAG, "", e);
247            return PRIORITY_OFF;
248        }
249    }
250
251    /** Helper for converting a state to a string.
252     * For debug use only - strings are not internationalized.
253     * @hide
254     */
255    public static String stateToString(int state) {
256        switch (state) {
257        case STATE_DISCONNECTED:
258            return "disconnected";
259        case STATE_CONNECTING:
260            return "connecting";
261        case STATE_CONNECTED:
262            return "connected";
263        case STATE_DISCONNECTING:
264            return "disconnecting";
265        case STATE_PLAYING:
266            return "playing";
267        default:
268            return "<unknown state " + state + ">";
269        }
270    }
271
272    private static void log(String msg) {
273        Log.d(TAG, msg);
274    }
275}
276