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Android example source code file (BluetoothA2dp.java)

This example Android source code file (BluetoothA2dp.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, annotate, bluetootha2dp, content, dbg, extra_sink_state, ibinder, os, priority_off, remoteexception, server, set, state_connected, state_connecting, state_disconnected, state_disconnecting, state_playing, string, tag, util

The BluetoothA2dp.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.bluetooth;

import android.annotation.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.server.BluetoothA2dpService;
import android.content.Context;
import android.os.ServiceManager;
import android.os.RemoteException;
import android.os.IBinder;
import android.util.Log;

import java.util.Arrays;
import java.util.Collections;
import java.util.Set;
import java.util.HashSet;

/**
 * Public API for controlling the Bluetooth A2DP Profile Service.
 *
 * BluetoothA2dp is a proxy object for controlling the Bluetooth A2DP
 * Service via IPC.
 *
 * Creating a BluetoothA2dp object will initiate a binding with the
 * BluetoothHeadset service. Users of this object should call close() when they
 * are finished, so that this proxy object can unbind from the service.
 *
 * Currently the BluetoothA2dp service runs in the system server and this
 * proxy object will be immediately bound to the service on construction.
 *
 * Currently this class provides methods to connect to A2DP audio sinks.
 *
 * @hide
 */
public final class BluetoothA2dp {
    private static final String TAG = "BluetoothA2dp";
    private static final boolean DBG = false;

    /** int extra for ACTION_SINK_STATE_CHANGED */
    public static final String EXTRA_SINK_STATE =
        "android.bluetooth.a2dp.extra.SINK_STATE";
    /** int extra for ACTION_SINK_STATE_CHANGED */
    public static final String EXTRA_PREVIOUS_SINK_STATE =
        "android.bluetooth.a2dp.extra.PREVIOUS_SINK_STATE";

    /** Indicates the state of an A2DP audio sink has changed.
     * This intent will always contain EXTRA_SINK_STATE,
     * EXTRA_PREVIOUS_SINK_STATE and BluetoothDevice.EXTRA_DEVICE
     * extras.
     */
    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
    public static final String ACTION_SINK_STATE_CHANGED =
        "android.bluetooth.a2dp.action.SINK_STATE_CHANGED";

    public static final int STATE_DISCONNECTED = 0;
    public static final int STATE_CONNECTING   = 1;
    public static final int STATE_CONNECTED    = 2;
    public static final int STATE_DISCONNECTING = 3;
    /** Playing implies connected */
    public static final int STATE_PLAYING    = 4;

    /** Default priority for a2dp devices that we try to auto-connect
     * and allow incoming connections */
    public static final int PRIORITY_AUTO_CONNECT = 1000;
    /** Default priority for a2dp devices that should allow incoming
     * connections */
    public static final int PRIORITY_ON = 100;
    /** Default priority for a2dp devices that should not allow incoming
     * connections */
    public static final int PRIORITY_OFF = 0;
    /** Default priority when not set or when the device is unpaired */
    public static final int PRIORITY_UNDEFINED = -1;

    private final IBluetoothA2dp mService;
    private final Context mContext;

    /**
     * Create a BluetoothA2dp proxy object for interacting with the local
     * Bluetooth A2DP service.
     * @param c Context
     */
    public BluetoothA2dp(Context c) {
        mContext = c;

        IBinder b = ServiceManager.getService(BluetoothA2dpService.BLUETOOTH_A2DP_SERVICE);
        if (b != null) {
            mService = IBluetoothA2dp.Stub.asInterface(b);
        } else {
            Log.w(TAG, "Bluetooth A2DP service not available!");

            // Instead of throwing an exception which prevents people from going
            // into Wireless settings in the emulator. Let it crash later when it is actually used.
            mService = null;
        }
    }

    /** Initiate a connection to an A2DP sink.
     *  Listen for SINK_STATE_CHANGED_ACTION to find out when the
     *  connection is completed.
     *  @param device Remote BT device.
     *  @return false on immediate error, true otherwise
     *  @hide
     */
    public boolean connectSink(BluetoothDevice device) {
        if (DBG) log("connectSink(" + device + ")");
        try {
            return mService.connectSink(device);
        } catch (RemoteException e) {
            Log.e(TAG, "", e);
            return false;
        }
    }

    /** Initiate disconnect from an A2DP sink.
     *  Listen for SINK_STATE_CHANGED_ACTION to find out when
     *  disconnect is completed.
     *  @param device Remote BT device.
     *  @return false on immediate error, true otherwise
     *  @hide
     */
    public boolean disconnectSink(BluetoothDevice device) {
        if (DBG) log("disconnectSink(" + device + ")");
        try {
            return mService.disconnectSink(device);
        } catch (RemoteException e) {
            Log.e(TAG, "", e);
            return false;
        }
    }

    /** Initiate suspend from an A2DP sink.
     *  Listen for SINK_STATE_CHANGED_ACTION to find out when
     *  suspend is completed.
     *  @param device Remote BT device.
     *  @return false on immediate error, true otherwise
     *  @hide
     */
    public boolean suspendSink(BluetoothDevice device) {
        try {
            return mService.suspendSink(device);
        } catch (RemoteException e) {
            Log.e(TAG, "", e);
            return false;
        }
    }

    /** Initiate resume from an suspended A2DP sink.
     *  Listen for SINK_STATE_CHANGED_ACTION to find out when
     *  resume is completed.
     *  @param device Remote BT device.
     *  @return false on immediate error, true otherwise
     *  @hide
     */
    public boolean resumeSink(BluetoothDevice device) {
        try {
            return mService.resumeSink(device);
        } catch (RemoteException e) {
            Log.e(TAG, "", e);
            return false;
        }
    }

    /** Check if a specified A2DP sink is connected.
     *  @param device Remote BT device.
     *  @return True if connected (or playing), false otherwise and on error.
     *  @hide
     */
    public boolean isSinkConnected(BluetoothDevice device) {
        if (DBG) log("isSinkConnected(" + device + ")");
        int state = getSinkState(device);
        return state == STATE_CONNECTED || state == STATE_PLAYING;
    }

    /** Check if any A2DP sink is connected.
     * @return a unmodifiable set of connected A2DP sinks, or null on error.
     * @hide
     */
    public Set<BluetoothDevice> getConnectedSinks() {
        if (DBG) log("getConnectedSinks()");
        try {
            return Collections.unmodifiableSet(
                    new HashSet<BluetoothDevice>(Arrays.asList(mService.getConnectedSinks())));
        } catch (RemoteException e) {
            Log.e(TAG, "", e);
            return null;
        }
    }

    /** Check if any A2DP sink is in Non Disconnected state
     * i.e playing, connected, connecting, disconnecting.
     * @return a unmodifiable set of connected A2DP sinks, or null on error.
     * @hide
     */
    public Set<BluetoothDevice> getNonDisconnectedSinks() {
        if (DBG) log("getNonDisconnectedSinks()");
        try {
            return Collections.unmodifiableSet(
                    new HashSet<BluetoothDevice>(Arrays.asList(mService.getNonDisconnectedSinks())));
        } catch (RemoteException e) {
            Log.e(TAG, "", e);
            return null;
        }
    }

    /** Get the state of an A2DP sink
     *  @param device Remote BT device.
     *  @return State code, one of STATE_
     *  @hide
     */
    public int getSinkState(BluetoothDevice device) {
        if (DBG) log("getSinkState(" + device + ")");
        try {
            return mService.getSinkState(device);
        } catch (RemoteException e) {
            Log.e(TAG, "", e);
            return BluetoothA2dp.STATE_DISCONNECTED;
        }
    }

    /**
     * Set priority of a2dp sink.
     * Priority is a non-negative integer. By default paired sinks will have
     * a priority of PRIORITY_AUTO, and unpaired headset PRIORITY_NONE (0).
     * Sinks with priority greater than zero will accept incoming connections
     * (if no sink is currently connected).
     * Priority for unpaired sink must be PRIORITY_NONE.
     * @param device Paired sink
     * @param priority Integer priority, for example PRIORITY_AUTO or
     *                 PRIORITY_NONE
     * @return true if priority is set, false on error
     */
    public boolean setSinkPriority(BluetoothDevice device, int priority) {
        if (DBG) log("setSinkPriority(" + device + ", " + priority + ")");
        try {
            return mService.setSinkPriority(device, priority);
        } catch (RemoteException e) {
            Log.e(TAG, "", e);
            return false;
        }
    }

    /**
     * Get priority of a2dp sink.
     * @param device Sink
     * @return non-negative priority, or negative error code on error.
     */
    public int getSinkPriority(BluetoothDevice device) {
        if (DBG) log("getSinkPriority(" + device + ")");
        try {
            return mService.getSinkPriority(device);
        } catch (RemoteException e) {
            Log.e(TAG, "", e);
            return PRIORITY_OFF;
        }
    }

    /** Helper for converting a state to a string.
     * For debug use only - strings are not internationalized.
     * @hide
     */
    public static String stateToString(int state) {
        switch (state) {
        case STATE_DISCONNECTED:
            return "disconnected";
        case STATE_CONNECTING:
            return "connecting";
        case STATE_CONNECTED:
            return "connected";
        case STATE_DISCONNECTING:
            return "disconnecting";
        case STATE_PLAYING:
            return "playing";
        default:
            return "<unknown state " + state + ">";
        }
    }

    private static void log(String msg) {
        Log.d(TAG, msg);
    }
}

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