android 4.4 蓝牙开发总结（电视盒子）

6.0的蓝牙已经开发完毕，因为可以得到系统6.0的jar包，so也就开发的快些，更好些。4.4因为代码部分在setting模块里，部分在系统中，so不方便打成jar包。所以就通过广播接受改变状态之类的。也算鼓捣出来一款。

4.4蓝牙效果

开发的思路：

1.开关蓝牙

2.扫描到蓝牙列表和得到配对列表

 

 

下面关于连接蓝牙：

A2dp：这个是蓝牙音频传输协议

AVRCP:输入设备控制协议

首先要弄清当前蓝牙的功能属于那种协议，具体代码判断协议的方法不清楚。（本项目用不到）

3.连接蓝牙

 

4.断开蓝牙与取消配对

 

1.开关蓝牙

   /**
     * 打开蓝牙or关闭蓝牙
     * @param flag true：open
     */
    public void openOrCloseBluetooth(boolean flag) {
        if (flag) {
            mBluetoothAdapter.enable();
        } else {
            mBluetoothAdapter.disable();
        }
    }

2.扫描到蓝牙列表和得到配对列表

扫描蓝牙

//开始扫描
    public void startScan() {
        if (mBluetoothAdapter != null) {
            // scanResultList.clear();
            if (mBluetoothAdapter.isDiscovering()) {
                Log.d(TAG, "startScan: cancelDiscovery");
                mBluetoothAdapter.cancelDiscovery();
            }
            mBluetoothAdapter.startDiscovery();
            Log.d(TAG, "startScan: 开始扫描周围蓝牙");
        } else {
            Log.d(TAG, "startScan: 扫描周围蓝牙异常");
        }
    }

扫描之后如何获取扫描结果主要通过广播获取

  private void registerBluetoothBroadcastReceiver(Context context) {
        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);//蓝牙状态改变的广播
        filter.addAction(BluetoothDevice.ACTION_FOUND);//找到设备的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);//搜索完成的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);//开始扫描的广播
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);//状态改变
        filter.addAction(BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED);
        if (mReceiver == null) {
            mReceiver = new BluetoothBroadCasteReceiver();
        }
        Log.d(TAG, "registerBluetoothBroadcastReceiver: 注册蓝牙广播" + mBluetoothAdapter.isEnabled());
        context.registerReceiver(mReceiver, filter);
    }

接受器中主要处理这三个状态

                case BluetoothAdapter.ACTION_DISCOVERY_STARTED:
                    Log.d(TAG, "onReceive: 开始扫描。");
                    break;
                case BluetoothAdapter.ACTION_DISCOVERY_FINISHED:
                    Log.d(TAG, "onReceive: 扫描结束。");
                    if (callBack != null) {
                        //callBack.scan_result(scanResultList,            getHasConnectBlueDevices());
                        callBack.scanEnd();
                    }
                    break;
                case BluetoothDevice.ACTION_CLASS_CHANGED:
                    Log.d(TAG, "onReceive: 一个已经改变的远程设备的蓝牙类。");
                    break;
                case BluetoothDevice.ACTION_FOUND:
                    device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    BluetoothDeviceBean bluetoothDeviceBean = new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_NONE);
                    if (device != null) {
                        //发现的设备统一给一个未配对的状态
                        if (callBack != null) {
                            callBack.foundDevice(bluetoothDeviceBean, getHasConnectBlueDevices());
                        }
                        Log.d(TAG, "onReceive: 远程设备发现。" + device.getName() + "??" + device.getAddress() + "???" + device.getBondState());
                    }
                    break;

tips：

1.扫描蓝牙的时候，扫描结束的广播等待时间较长，为了页面体验就在发现设备的广播中，做数据的收集，但注意的是同一个设备会多次被发现，所以数据要做一些扁平化处理

2.扫描的结果也包含了已经配对的，so数据应该做一些处理

获得已经配对的列表

 /**
     * 获得已经配对的蓝牙列表
     * @return
     */
    public Set<BluetoothDeviceBean> getHasConnectBlueDevices() {
        Set<BluetoothDevice> bondedDevices = mBluetoothAdapter.getBondedDevices();
        Set<BluetoothDeviceBean> bluetoothDeviceBeans = new LinkedHashSet<>();
        if (bondedDevices != null) {
            for (BluetoothDevice de :
                    bondedDevices) {
                bluetoothDeviceBeans.add(new BluetoothDeviceBean(de, Bluetooth_State.State_BOND_BONDED));
            }
            Log.e(TAG, "getHasConnectBlueDevices: 已经配对的蓝牙设备" + bluetoothDeviceBeans.toString());
            return bluetoothDeviceBeans;
        } else {
            Log.e(TAG, "没有已经配对的蓝牙设备");
            return bluetoothDeviceBeans;
        }
    }

tips：已经配对的列表中及时当前的设备没有连接也会显示。

3.连接蓝牙

连接蓝牙主要分为两部分，一部分是配对，配对完成后再连接

配对：

 /**
     * 蓝牙配对
     * @param btClass
     * @param btDevice
     */
    public void createBond(Class btClass, BluetoothDevice btDevice) {
        Method createBondMethod = null;
        try {
            createBondMethod = btClass.getMethod("createBond");
            Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
            Log.d(TAG, "createBond: XXXX");
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            Log.d(TAG, "createBond: XXXX1");
        } catch (InvocationTargetException e) {
            Log.d(TAG, "createBond: XXXX2");
            e.printStackTrace();
        }
    }

在广播中得到配对的状态：

               case BluetoothDevice.ACTION_BOND_STATE_CHANGED:
                    int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);
                    switch (state) {
                        case BluetoothDevice.BOND_NONE:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_NONE 删除配对" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_NONE));
                            }
                            break;
                        case BluetoothDevice.BOND_BONDING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_BONDING 正在配对" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_BONDING));
                            }
                            break;
                        case BluetoothDevice.BOND_BONDED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_BONDED 配对成功" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_BONDED));
                            }
                            //连接操作
                            conectBluetoothDevice(device);
                            break;
                    }
                    break;

收到配对成功的广播进行连接：

A2dp连接：

 //连接蓝牙
    public void conectBluetoothDevice(BluetoothDevice device) {
        if (mA2dpService != null) {
            try {
                Log.d(TAG, "createBond: 配对成功开始连接");
                mA2dpService.connect(device);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }
    }

输入控制设备的连接：

 /**
     * 
     * @param device
     * @param isConnect true:连接 false：断开
     */
    private void connectOrDisConnectHidBT(BluetoothDevice device, boolean isConnect) {
        if (mHidService != null) {
            //连接
            try {
                String flag = "";
                if (isConnect) {
                    flag = "connect";
                } else {
                    flag = "disconnect";
                }
                if (mHidService.getProfile() == getInputDeviceHiddenConstant()) {
                    if (device != null) {
                        //得到BluetoothInputDevice然后反射connect连接设备
                        Method method = mHidService.getProxy().getClass().getMethod(flag,
                                new Class[]{BluetoothDevice.class});
                        method.invoke(mHidService.getProxy(), device);
                    }
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
            }
        }
    }

 /**
     * 获取BluetoothProfile中hid的profile，"INPUT_DEVICE"类型隐藏，需反射获取
     * @return
     */
    @SuppressLint("NewApi")
    public static int getInputDeviceHiddenConstant() {
        Class<BluetoothProfile> clazz = BluetoothProfile.class;
        for (Field f : clazz.getFields()) {
            int mod = f.getModifiers();
            if (Modifier.isStatic(mod) && Modifier.isPublic(mod)
                    && Modifier.isFinal(mod)) {
                try {
                    if (f.getName().equals("INPUT_DEVICE")) {
                        return f.getInt(null);
                    }
                } catch (Exception e) {
                }
            }
        }
        return -1;
    }

tips：连接蓝牙的时候，需要开启一个服务，通过广播接受来判定是否连接成功

A2dp的服务：

    private void initA2dpService() {
        Intent i = new Intent(IBluetoothA2dp.class.getName());
        context.bindService(i, mConnection, Context.BIND_AUTO_CREATE);
    }

    IBluetoothA2dp mA2dpService;
    public ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            try {
                mA2dpService = IBluetoothA2dp.Stub.asInterface(service);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            // TODO Auto-generated method stub

        }

    };

               case BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED:
                    switch (intent.getIntExtra(BluetoothA2dp.EXTRA_STATE, -1)) {
                        case BluetoothA2dp.STATE_CONNECTING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BluetoothA2dp.STATE_CONNECTING: " + device.getName() + " connecting");
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_CONNECTING));
                            }
                            break;