android藍芽學習

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學習路線

1 藍芽許可權

<uses-permission android:name="android.permission.BLUETOOTH" /><uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> //安卓6.0版本需要位置許可權

 

2 開啟藍芽

public void onOpen(View v) {        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); //擷取藍芽適配器        if (!bluetoothAdapter.isEnabled()) {                     //如果藍芽是關閉的，則開啟            bluetoothAdapter.enable();            showMessage("Open bluetooth");        } else {            showMessage("Bluetooth is already open");        }    }

 

 

3 掃描周圍藍芽（擷取配對藍芽）

   掃描周圍的藍芽需要定義一個廣播接收器

private BroadcastReceiver mReceiver=new BroadcastReceiver(){        @Override        public void onReceive(Context context, Intent intent) {            String action=intent.getAction();            Log.i("boye", action);            if(action.equals(BluetoothDevice.ACTION_FOUND)) {                BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);    //擷取當前掃描到的裝置                if(device.getBondState()==BluetoothDevice.BOND_BONDED) {    　　　　　　　　　　　　　 //顯示已配對裝置                    textView.append("\n"+device.getName()+"==>"+device.getAddress()+"\n");                    Toast.makeText(context, "發現已配對裝置:" + device.getName(), Toast.LENGTH_LONG).show();                } else if(device.getBondState()!=BluetoothDevice.BOND_BONDED) {                    textView3.append("\n"+device.getName()+"==>"+device.getAddress()+"\n");                    Toast.makeText(context, "發現未配對裝置:" + device.getName(), Toast.LENGTH_LONG).show();                }            } else if(action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)){                    textView2.setText("搜尋完成...");            }        }    };

廣播過濾器

IntentFilter filter=new IntentFilter(BluetoothDevice.ACTION_FOUND);                  //過濾出發現registerReceiver(mReceiver,filter);                                                  //註冊廣播IntentFilter filter2=new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);   //過濾出掃描結束registerReceiver(mReceiver,filter2);                                                 //註冊廣播

 

4  藍芽配對

public void createBond(BluetoothDevice btDev, Handler handler) {        if (btDev.getBondState() == BluetoothDevice.BOND_NONE) {            //如果這個裝置取消了配對，則嘗試配對            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { //安卓版本大於等於4.3                btDev.createBond();            }        } else if (btDev.getBondState() == BluetoothDevice.BOND_BONDED) {            //如果這個裝置已經配對完成，則嘗試串連            connect(btDev, handler);        }    }

 

 

 

5  藍芽的串連

private void connect(BluetoothDevice btDev, Handler handler) {        try {            //通過和伺服器協商的uuid來進行串連            mBluetoothSocket = btDev.createRfcommSocketToServiceRecord(BltContant.SPP_UUID);            if (mBluetoothSocket != null)                //全域只有一個bluetooth，所以我們可以將這個socket對象儲存在appliaction中                BltAppliaction.bluetoothSocket = mBluetoothSocket;            Log.i("blueTooth", "開始串連...");            //在建立之前調用            if (getmBluetoothAdapter().isDiscovering())                //停止搜尋                getmBluetoothAdapter().cancelDiscovery();            //如果當前socket處於非串連狀態則調用串連            if (!getmBluetoothSocket().isConnected()) {                //你應當確保在調用connect()時裝置沒有執行搜尋裝置的操作。                // 如果搜尋裝置也在同時進行，那麼將會顯著地降低串連速率，並很大程度上會串連失敗。                getmBluetoothSocket().connect();            }            Log.i("blueTooth", "已經串連");            if (handler == null) return;            //結果回調            Message message = new Message();            message.what = 4;            message.obj = btDev;            handler.sendMessage(message);        } catch (Exception e) {            Log.i("blueTooth", "...串連失敗");            try {                getmBluetoothSocket().close();            } catch (IOException e1) {                e1.printStackTrace();            }            e.printStackTrace();        }    }

 

 

 

6  藍芽通訊

（1）發送訊息

public static void sendMessage(String message) {        if (BltAppliaction.bluetoothSocket == null || TextUtils.isEmpty(message)) return;        try {            //message += "\n";            OutputStream outputStream = BltAppliaction.bluetoothSocket.getOutputStream();            outputStream.write(message.getBytes("utf-8"));            outputStream.flush();        } catch (IOException e) {            e.printStackTrace();        }    }}

（2）接收訊息

public static void receiveMessage(Handler handler) {        if (BltAppliaction.bluetoothSocket == null || handler == null) return;        try {            InputStream inputStream = BltAppliaction.bluetoothSocket.getInputStream();            byte[] buffer = new byte[200];            inputStream.read(buffer);            Log.i("boye收到的資訊",new String(buffer));            Message message = new Message();            message.obj = new String(buffer);            message.what = 1;            handler.sendMessage(message);                  } catch (IOException e) {            e.printStackTrace();        }    }

 

android藍芽學習