BluetoothA2dp.java revision 005b228cdfb369d9b3b325884c0337ba5968bf8c 
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            throw new RuntimeException("Bluetooth A2DP service not available!");
98        }
99        mService = IBluetoothA2dp.Stub.asInterface(b);
100    }
101
102    /** Initiate a connection to an A2DP sink.
103     *  Listen for SINK_STATE_CHANGED_ACTION to find out when the
104     *  connection is completed.
105     *  @param device Remote BT device.
106     *  @return false on immediate error, true otherwise
107     *  @hide
108     */
109    public boolean connectSink(BluetoothDevice device) {
110        if (DBG) log("connectSink(" + device + ")");
111        try {
112            return mService.connectSink(device);
113        } catch (RemoteException e) {
114            Log.e(TAG, "", e);
115            return false;
116        }
117    }
118
119    /** Initiate disconnect from an A2DP sink.
120     *  Listen for SINK_STATE_CHANGED_ACTION to find out when
121     *  disconnect is completed.
122     *  @param device Remote BT device.
123     *  @return false on immediate error, true otherwise
124     *  @hide
125     */
126    public boolean disconnectSink(BluetoothDevice device) {
127        if (DBG) log("disconnectSink(" + device + ")");
128        try {
129            return mService.disconnectSink(device);
130        } catch (RemoteException e) {
131            Log.e(TAG, "", e);
132            return false;
133        }
134    }
135
136    /** Check if a specified A2DP sink is connected.
137     *  @param device Remote BT device.
138     *  @return True if connected (or playing), false otherwise and on error.
139     *  @hide
140     */
141    public boolean isSinkConnected(BluetoothDevice device) {
142        if (DBG) log("isSinkConnected(" + device + ")");
143        int state = getSinkState(device);
144        return state == STATE_CONNECTED || state == STATE_PLAYING;
145    }
146
147    /** Check if any A2DP sink is connected.
148     * @return a unmodifiable set of connected A2DP sinks, or null on error.
149     * @hide
150     */
151    public Set<BluetoothDevice> getConnectedSinks() {
152        if (DBG) log("getConnectedSinks()");
153        try {
154            return Collections.unmodifiableSet(
155                    new HashSet<BluetoothDevice>(Arrays.asList(mService.getConnectedSinks())));
156        } catch (RemoteException e) {
157            Log.e(TAG, "", e);
158            return null;
159        }
160    }
161
162    /** Get the state of an A2DP sink
163     *  @param device Remote BT device.
164     *  @return State code, one of STATE_
165     *  @hide
166     */
167    public int getSinkState(BluetoothDevice device) {
168        if (DBG) log("getSinkState(" + device + ")");
169        try {
170            return mService.getSinkState(device);
171        } catch (RemoteException e) {
172            Log.e(TAG, "", e);
173            return BluetoothA2dp.STATE_DISCONNECTED;
174        }
175    }
176
177    /**
178     * Set priority of a2dp sink.
179     * Priority is a non-negative integer. By default paired sinks will have
180     * a priority of PRIORITY_AUTO, and unpaired headset PRIORITY_NONE (0).
181     * Sinks with priority greater than zero will accept incoming connections
182     * (if no sink is currently connected).
183     * Priority for unpaired sink must be PRIORITY_NONE.
184     * @param device Paired sink
185     * @param priority Integer priority, for example PRIORITY_AUTO or
186     *                 PRIORITY_NONE
187     * @return true if priority is set, false on error
188     */
189    public boolean setSinkPriority(BluetoothDevice device, int priority) {
190        if (DBG) log("setSinkPriority(" + device + ", " + priority + ")");
191        try {
192            return mService.setSinkPriority(device, priority);
193        } catch (RemoteException e) {
194            Log.e(TAG, "", e);
195            return false;
196        }
197    }
198
199    /**
200     * Get priority of a2dp sink.
201     * @param device Sink
202     * @return non-negative priority, or negative error code on error.
203     */
204    public int getSinkPriority(BluetoothDevice device) {
205        if (DBG) log("getSinkPriority(" + device + ")");
206        try {
207            return mService.getSinkPriority(device);
208        } catch (RemoteException e) {
209            Log.e(TAG, "", e);
210            return PRIORITY_OFF;
211        }
212    }
213
214    /** Helper for converting a state to a string.
215     * For debug use only - strings are not internationalized.
216     * @hide
217     */
218    public static String stateToString(int state) {
219        switch (state) {
220        case STATE_DISCONNECTED:
221            return "disconnected";
222        case STATE_CONNECTING:
223            return "connecting";
224        case STATE_CONNECTED:
225            return "connected";
226        case STATE_DISCONNECTING:
227            return "disconnecting";
228        case STATE_PLAYING:
229            return "playing";
230        default:
231            return "<unknown state " + state + ">";
232        }
233    }
234
235    private static void log(String msg) {
236        Log.d(TAG, msg);
237    }
238}
239