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Android example source code file (BluetoothAudioGateway.java)

This example Android source code file (BluetoothAudioGateway.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, bluetoothadapter, bluetoothaudiogateway, bluetoothdevice, connect, dbg, default_hf_ag_channel, default_hs_ag_channel, incomingconnectioninfo, interruptedexception, message, msg_incoming_handsfree_connection, msg_incoming_headset_connection, os, string, thread, util, utilities, utils

The BluetoothAudioGateway.java Android example source code

/*
 * Copyright (C) 2007 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 java.lang.Thread;

import android.os.Message;
import android.os.Handler;
import android.util.Log;

/**
 * Listen's for incoming RFCOMM connection for the headset / handsfree service.
 *
 * TODO: Use the new generic BluetoothSocket class instead of this legacy code
 *
 * @hide
 */
public final class BluetoothAudioGateway {
    private static final String TAG = "BT Audio Gateway";
    private static final boolean DBG = false;

    private int mNativeData;
    static { classInitNative(); }

    /* in */
    private int mHandsfreeAgRfcommChannel = -1;
    private int mHeadsetAgRfcommChannel   = -1;

    /* out - written by native code */
    private String mConnectingHeadsetAddress;
    private int mConnectingHeadsetRfcommChannel; /* -1 when not connected */
    private int mConnectingHeadsetSocketFd;
    private String mConnectingHandsfreeAddress;
    private int mConnectingHandsfreeRfcommChannel; /* -1 when not connected */
    private int mConnectingHandsfreeSocketFd;
    private int mTimeoutRemainingMs; /* in/out */

    private final BluetoothAdapter mAdapter;

    public static final int DEFAULT_HF_AG_CHANNEL = 10;
    public static final int DEFAULT_HS_AG_CHANNEL = 11;

    public BluetoothAudioGateway(BluetoothAdapter adapter) {
        this(adapter, DEFAULT_HF_AG_CHANNEL, DEFAULT_HS_AG_CHANNEL);
    }

    public BluetoothAudioGateway(BluetoothAdapter adapter, int handsfreeAgRfcommChannel,
                int headsetAgRfcommChannel) {
        mAdapter = adapter;
        mHandsfreeAgRfcommChannel = handsfreeAgRfcommChannel;
        mHeadsetAgRfcommChannel = headsetAgRfcommChannel;
        initializeNativeDataNative();
    }

    private Thread mConnectThead;
    private volatile boolean mInterrupted;
    private static final int SELECT_WAIT_TIMEOUT = 1000;

    private Handler mCallback;

    public class IncomingConnectionInfo {
        public BluetoothAdapter mAdapter;
        public BluetoothDevice mRemoteDevice;
        public int mSocketFd;
        public int mRfcommChan;
        IncomingConnectionInfo(BluetoothAdapter adapter, BluetoothDevice remoteDevice,
                int socketFd, int rfcommChan) {
            mAdapter = adapter;
            mRemoteDevice = remoteDevice;
            mSocketFd = socketFd;
            mRfcommChan = rfcommChan;
        }
    }

    public static final int MSG_INCOMING_HEADSET_CONNECTION   = 100;
    public static final int MSG_INCOMING_HANDSFREE_CONNECTION = 101;

    public synchronized boolean start(Handler callback) {

        if (mConnectThead == null) {
            mCallback = callback;
            mConnectThead = new Thread(TAG) {
                    public void run() {
                        if (DBG) log("Connect Thread starting");
                        while (!mInterrupted) {
                            //Log.i(TAG, "waiting for connect");
                            mConnectingHeadsetRfcommChannel = -1;
                            mConnectingHandsfreeRfcommChannel = -1;
                            if (waitForHandsfreeConnectNative(SELECT_WAIT_TIMEOUT) == false) {
                                if (mTimeoutRemainingMs > 0) {
                                    try {
                                        Log.i(TAG, "select thread timed out, but " + 
                                              mTimeoutRemainingMs + "ms of waiting remain.");
                                        Thread.sleep(mTimeoutRemainingMs);
                                    } catch (InterruptedException e) {
                                        Log.i(TAG, "select thread was interrupted (2), exiting");
                                        mInterrupted = true;
                                    }
                                }
                            }
                            else {
                                Log.i(TAG, "connect notification!");
                                /* A device connected (most likely just one, but 
                                   it is possible for two separate devices, one 
                                   a headset and one a handsfree, to connect
                                   simultaneously. 
                                */
                                if (mConnectingHeadsetRfcommChannel >= 0) {
                                    Log.i(TAG, "Incoming connection from headset " + 
                                          mConnectingHeadsetAddress + " on channel " + 
                                          mConnectingHeadsetRfcommChannel);
                                    Message msg = Message.obtain(mCallback);
                                    msg.what = MSG_INCOMING_HEADSET_CONNECTION;
                                    msg.obj = new IncomingConnectionInfo(
                                        mAdapter,
                                        mAdapter.getRemoteDevice(mConnectingHeadsetAddress),
                                        mConnectingHeadsetSocketFd,
                                        mConnectingHeadsetRfcommChannel);
                                    msg.sendToTarget();
                                }
                                if (mConnectingHandsfreeRfcommChannel >= 0) {
                                    Log.i(TAG, "Incoming connection from handsfree " + 
                                          mConnectingHandsfreeAddress + " on channel " + 
                                          mConnectingHandsfreeRfcommChannel);
                                    Message msg = Message.obtain();
                                    msg.setTarget(mCallback);
                                    msg.what = MSG_INCOMING_HANDSFREE_CONNECTION;
                                    msg.obj = new IncomingConnectionInfo(
                                        mAdapter,
                                        mAdapter.getRemoteDevice(mConnectingHandsfreeAddress),
                                        mConnectingHandsfreeSocketFd,
                                        mConnectingHandsfreeRfcommChannel);
                                    msg.sendToTarget();
                                }
                            }
                        }
                        if (DBG) log("Connect Thread finished");
                    }
                };

            if (setUpListeningSocketsNative() == false) {
                Log.e(TAG, "Could not set up listening socket, exiting");
                return false;
            }

            mInterrupted = false;
            mConnectThead.start();
        }

        return true;
    }

    public synchronized void stop() {
        if (mConnectThead != null) {
            if (DBG) log("stopping Connect Thread");
            mInterrupted = true;
            try {
                mConnectThead.interrupt();
                if (DBG) log("waiting for thread to terminate");
                mConnectThead.join();
                mConnectThead = null;
                mCallback = null;
                tearDownListeningSocketsNative();
            } catch (InterruptedException e) {
                Log.w(TAG, "Interrupted waiting for Connect Thread to join");
            }
        }
    }

    protected void finalize() throws Throwable {
        try {
            cleanupNativeDataNative();
        } finally {
            super.finalize();
        }
    }

    private static native void classInitNative();
    private native void initializeNativeDataNative();
    private native void cleanupNativeDataNative();
    private native boolean waitForHandsfreeConnectNative(int timeoutMs);
    private native boolean setUpListeningSocketsNative();
    private native void tearDownListeningSocketsNative();

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

Other Android examples (source code examples)

Here is a short list of links related to this Android BluetoothAudioGateway.java source code file:

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