? 我在兩家公司都用到了app與BLE設備通訊，當時也是什么都不懂，在網上各種搜索，各種查資料，總算弄出來了。在這里記錄下來，希望對有需要的人有些幫助。

? 1.檢測手機是否支持藍牙4.0（一般手機4.3以上的android系統都支持）

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<span style="font-size:14px;"> if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {showMsg(R.string.ble_not_supported);finish();}</span> ?? 2.檢測藍牙是否打開，提示用戶打開藍牙（在此之前需要加相應的權限）
????? 添加權限： <span style="font-size:14px;"> <uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/><uses-permission android:name="android.permission.BLUETOOTH"/><uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/></span>
?????? 獲取藍牙適配器

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<span style="font-size:14px;">final BluetoothManager bluetoothManager =(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);bluetoothAdapter = bluetoothManager.getAdapter();如果藍牙處于關閉狀態，則通過下面代碼提示用戶啟動藍牙：Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);</span>????? 3.啟動關閉藍牙，獲取藍牙狀態
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?????????? 判斷藍牙狀態：bluetoothAdapter.isEnabled()

?????????? 開啟藍牙：bluetoothAdapter.enable();

?????????? 關閉藍牙：bluetoothAdapter.disable();

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????? 4.藍牙啟動后，就該搜索設備了

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?????????? 開啟搜索：?bluetoothAdapter.startLeScan(mLeScanCallback);

??????? ?? 停止搜索： bluetoothAdapter.stopLeScan(mLeScanCallback);

?????????? 搜索回調：

?????????????????????

private BluetoothAdapter.LeScanCallback mLeScanCallback =new BluetoothAdapter.LeScanCallback() {@Overridepublic void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {runOnUiThread(new Runnable() {@Overridepublic void run() {//在這里將搜到的設備顯示到界面}});}};??????????

??????? 5.建立連接

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???????????

public boolean connect(BluetoothDevice device ) {if (device == null) {Log.w(TAG, "Device not found. Unable to connect.");return false;}mBluetoothGatt = device.connectGatt(this, false, mGattCallback);return true;} ???????????????????????
????????????? 連接時需要注冊一個回調接口： private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {//檢測連接狀態變化@Overridepublic void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {if (newState == BluetoothProfile.STATE_CONNECTED) {} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {}}@Overridepublic void onServicesDiscovered(BluetoothGatt gatt, int status) {}@Overridepublic void onCharacteristicRead(BluetoothGatt gatt,BluetoothGattCharacteristic characteristic,int status) {}//接收藍牙回傳數據@Overridepublic void onCharacteristicChanged(BluetoothGatt gatt,BluetoothGattCharacteristic characteristic) {System.out.println("接收數據");byte[] data=characteristic.getValue();}//檢測用戶向藍牙寫數據的狀態@Overridepublic void onCharacteristicWrite(BluetoothGatt gatt,BluetoothGattCharacteristic characteristic, int status) {Log.e(TAG, "write status"+":"+status);if(status==BluetoothGatt.GATT_SUCCESS){System.out.println("--------write success----- status:");}super.onCharacteristicWrite(gatt, characteristic, status);}};?????? 斷開連接：

????????????? ?mBluetoothGatt.disconnect();

?6.發送數據

???? //設置特性數據回傳通知

public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,boolean enabled) {if (mBluetoothAdapter == null || mBluetoothGatt == null) {Log.w(TAG, "BluetoothAdapter not initialized");return;}if (mBluetoothGatt.setCharacteristicNotification(characteristic, enabled)) {BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"));descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);mBluetoothGatt.writeDescriptor(descriptor);}}/*** 向設備發送數據* @param serviceUuid* @param characterUuid* @param notifactionUuid* @param data*/public void writeDataToDevice(byte[] data){if (mBluetoothGatt == null) {return;}BluetoothGattService bluetoothGattService = mBluetoothGatt.getService(UUID.fromString("0000fff0-0000-1000-8000-00805f9b34fb"));//藍牙設備中需要使用的服務的UUIDif (bluetoothGattService == null) {Log.e(TAG, "service:"+mBluetoothGatt.getServices().size());Log.e(TAG, "service not found!");return;}BluetoothGattCharacteristic mCharac = bluetoothGattService.getCharacteristic("0000fff6-0000-1000-8000-00805f9b34fb");//需要使用該服務下具體某個特性的UUIDif (mCharac == null) {Log.e(TAG, "HEART RATE Copntrol Point charateristic not found!");return;}BluetoothGattCharacteristic nCharacteristic=bluetoothGattService.getCharacteristic("0000fff7-0000-1000-8000-00805f9b34fb");//藍牙模塊向手機端回傳特性UUIDsetCharacteristicNotification(nCharacteristic, true);Log.e(TAG, "data:"+Arrays.toString(data));mCharac.setValue(data); //設置需要發送的數據try {Thread.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}writeCharacteristic(mCharac);}public void writeCharacteristic(BluetoothGattCharacteristic characteristic) {if (mBluetoothAdapter == null || mBluetoothGatt == null) {Log.e(TAG, "BluetoothAdapter not initialized");return;}boolean result=mBluetoothGatt.writeCharacteristic(characteristic);//開始寫入數據if(result){Log.e(TAG, "write success!");}else {Log.e(TAG, "write fail!");}}

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總結

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