android: 建立和断开a2dp link 相关方法总结

参考依赖库：

implementation 'cn.com.superLei:blelibrary:3.0.0'

GitHub - zemoLee/HeadSetConnectA2DP: 蓝牙耳机连接A2DP音频

总结关于蓝牙A2DP 操作的一些相关方法和接口：

1. 设置获取A2dp对象

 /**
     * 服务监听器，通过绑定服务获取BluetoothA2dp对象
     */
     private BluetoothA2dp mBluetoothA2dp;

    public class MyServiceListener implements BluetoothProfile.ServiceListener {

        @Override
        public void onServiceConnected(int profile, BluetoothProfile proxy) {
            LoggerUtils.d(TAG + "onServiceConnected()");
            /**
             *  use reflect method to get the Hide method "connectToDevice" in BluetoothA2DP
             */
            if (profile == BluetoothProfile.A2DP) {
                mBluetoothA2dp = (BluetoothA2dp) proxy;

            }
        }

        @Override
        public void onServiceDisconnected(int profile) {
            LoggerUtils.d(TAG + "onServiceDisconnected  " + profile);
            if (profile == BluetoothProfile.A2DP) {
                mBluetoothA2dp = null;
            }
        }

    sBluetoothAdapter.getProfileProxy(context, new MyServiceListener(), BluetoothProfile.A2DP);

2. 判断A2DP link 是否已建立

if (sBluetoothAdapter.getProfileConnectionState(BluetoothProfile.A2DP) == BluetoothProfile.STATE_CONNECTED) {
            return true;
 }

3. 获取连接的A2DP 设备

 public BluetoothDevice getConnectedA2dp(BluetoothA2dp mBluetoothA2dp) {
        LoggerUtils.d(TAG + "getconnectedA2dp()");
        List<BluetoothDevice> connectedDevices = mBluetoothA2dp.getConnectedDevices();
        if (connectedDevices != null && connectedDevices.size() > 0) {
            BluetoothDevice device = connectedDevices.get(0);
            return device;
        }
        return null;
 }

4. 蓝牙设备扫描 

BluetoothAdapter sBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();  // 获取蓝牙适配器
sBluetoothAdapter.isEnabled() 　　　　　　　　　　　　　　　　　　　　 　// 判断手机蓝牙是否开启
sBluetoothAdapter.enable(); 　　　　　　　　　　　　　　　　　　　　　 　// 尝试开机手机蓝牙
sBluetoothAdapter.startDiscovery();　　　　　　　　　　　　　　　　　　  // 开启扫描蓝牙设备
sBluetoothAdapter.cancelDiscovery();　　　　　　　　　　　　　　　　　　 // 停止扫描蓝牙设备

5. 注册监听蓝牙状态改变的一些通知

public void register() {
        LoggerUtils.d(TAG + "register()");
        IntentFilter filter = new IntentFilter();
        //扫描action
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
        filter.addAction(BluetoothDevice.ACTION_FOUND);
        //配对监听
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
//      filter.addAction(BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED);
        filter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
        filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
        filter.addAction(BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED);//A2dp状态改变
        MyApp.getContext().registerReceiver(MYBroadcast, filter);
 }

6. 监听回调

BroadcastReceiver MYBroadcast = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            /**
             * 开始扫描
             */
            if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_STARTED)) {
                if (mDiscoveryListener == null) return;
                bluetoothDevices.clear();
                LoggerUtils.d(TAG + "ACTION_DISCOVERY_STARTED");
                mDiscoveryListener.onScanStart();

                /**
                 * 扫描结束
                 */
            } else if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)) {
                if (mDiscoveryListener == null) return;
                mDiscoveryListener.onScanFinish();

                discoveryTimes--;

                if (bluetoothDevices.size() == 0 && discoveryTimes > 0) {
                    LoggerUtils.d(TAG + "==================");
                    startDiscovery(true);
                } else {
                    discoveryTimes = 3;
                }
                LoggerUtils.d(TAG + "ACTION_DISCOVERY_FINISHED");
                /**
                 * 发现设备
                 */
            } else if (action.equals(BluetoothDevice.ACTION_FOUND)) {
                if (mDiscoveryListener == null) return;
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                mDiscoveryListener.onDeviceFound(device);
                bluetoothDevices.add(device);
                LoggerUtils.d(TAG + "ACTION_FOUND: " + device.getAddress() + "\n" + device.getName());
                /**
                 * 绑定状态改变
                 */
            } else if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {//绑定状态监听
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
                    connectToDevice();
                }
                /**
                 * 连接状态改变
                 */
            } else if (action.equals(BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED)) {
                LoggerUtils.d(TAG + "ACTION_CONNECTION_STATE_CHANGED");

                /**
                 * spp连接
                 */
            } else if (action.equals(BluetoothDevice.ACTION_ACL_CONNECTED)) {

                LoggerUtils.d(TAG + "ACTION_ACL_CONNECTED");

                /**
                 * spp断开连接
                 */
            } else if (action.equals(BluetoothDevice.ACTION_ACL_DISCONNECTED)) {
                LoggerUtils.d(TAG + "ACTION_ACL_DISCONNECTED");


                /**
                 * 断开请求
                 */
            } else if (action.equals(BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED)) {
                LoggerUtils.d(TAG + "ACTION_ACL_DISCONNECT_REQUESTED");

                /**
                 * A2dp
                 */
            } else if (action.equals(BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED)) {
                int state = intent.getIntExtra(BluetoothA2dp.EXTRA_STATE, 0);
                /**
                 * A2dp连接成功
                 */
                if (state == BluetoothA2dp.STATE_CONNECTED) {
                    if (mBluetoothA2dp == null) return;
                    mLastBluetoothDevice = sBluetoothDevice;
                    sBluetoothDevice = getConnectedA2dpDevice(mBluetoothA2dp);
                    LoggerUtils.d(TAG + "onReceive: " + "A2dp的连接成功");
                    notifyConnectSuccess();
//                        if(sJIElIManager != null && sJIElIManager.getFilePathItemList())
                    /**
                     * A2dp断开
                     */
                } else if (state == BluetoothA2dp.STATE_DISCONNECTED) {
                    LoggerUtils.d(TAG + "onReceive: " + "A2dp断开");
                    notifyDisconnect();
                }
            }
        }
    };

7. 连接蓝牙

 public void connectToDevice() {
        LoggerUtils.d(TAG + "connectToDevice()");
        if (sBluetoothDevice == null) return;
        if (getBluetoothType() == 2) {
            LoggerUtils.d(TAG + "杰里蓝牙连接");
            switch (sBluetoothDevice.getBondState()) {
                case BluetoothDevice.BOND_NONE:

                    boolean returnValue = createBond();//配对
                    if (returnValue) {
                        LoggerUtils.d(TAG + "配对成功");
                    } else {
                        LoggerUtils.d(TAG + "配对失败");
                    }

                    break;
                case BluetoothDevice.BOND_BONDED:
                    try {
                        BluetoothSocket socket = device.createRfcommSocketToServiceRecord(DUUID);

                         Method method_connect = clazz.getMethod("connect", BluetoothDevice.class);

                        Boolean BooleanValue = (Boolean) method_connect.invoke(mBluetoothA2dp, mBluetoothDevice);
                        }

                    } catch (Exception e) {
                        e.printStackTrace();
                        LoggerUtils.d(TAG + "A2dp连接异常，reason = " + e.getCause());
                    }
                    break;

            }
        } 
  }

8. 绑定设备

public boolean createBond() {
        try {
            Method createBondMethod = BluetoothDevice.class.getMethod("createBond");
            Boolean returnValue = (Boolean) createBondMethod.invoke(sBluetoothDevice);
            return returnValue;
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        return false;
 }

9, 断开蓝牙

try {
   Method method_disconnect = clazz.getMethod("disconnect", BluetoothDevice.class);
   Boolean BooleanValue = (Boolean) method_disconnect.invoke(mBluetoothA2dp,  mBluetoothDevice);
       } catch (Exception e) {
        e.printStackTrace();
       LoggerUtils.d(TAG + "断开A2dp连接异常，reason = " + e.getMessage());
       }
      if (socket != null) {
      try {
         socket.close();
         socket = null;
         LoggerUtils.d(TAG + "断开spp socket成功");
     } catch (IOException e) {
          e.printStackTrace();
          LoggerUtils.d(TAG + "断开spp socket异常，reason = " + e.getCause());
   }
 }

10. 解绑定设备

 public boolean removeBond() {
        try {
            Method removeBondMethod = BluetoothDevice.class.getMethod("removeBond");
            Boolean returnValue = (Boolean) removeBondMethod.invoke(sBluetoothDevice);
            return returnValue.booleanValue();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        return false;
    }

参考链接：android: 建立和断开a2dp link 相关方法总结 - 夜行过客 - 博客园 (cnblogs.com)

1. Android蓝牙A2dp开发