android BLE 蓝牙的连接（二）
下面是基于实际的项目得到的具体步骤及核心代码
1、权限问题
先判断手机是否满足android4.3以上版本，再判断手机是否开启蓝牙 主要涉及蓝牙权限和位置权限，注意不同android版本之间权限申请的差异，以及android权限动态申请和静态申请的区别
//动态申请权限相关
private String[] requestPermissionArray = new String[]{
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION,
//Manifest.permission.ACCESS_BACKGROUND_LOCATION,
Manifest.permission.BLUETOOTH,
Manifest.permission.BLUETOOTH_ADMIN,
Manifest.permission.BLUETOOTH_SCAN,
Manifest.permission.BLUETOOTH_ADVERTISE,
Manifest.permission.BLUETOOTH_CONNECT,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.READ_EXTERNAL_STORAGE
};
/**
* 初始化权限
*/
public void initNeedPermissions() {
/**Android 6.0以上动态申请权限*/
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
final PermissionRequest permissionRequest = new PermissionRequest();
permissionRequest.requestRuntimePermission(MainActivity.this, requestPermissionArray, new PermissionListener() {
@Override
public void onGranted() {
Log.d(TAG,"所有权限已被授予");
}
/**用户勾选“不再提醒”拒绝权限后，关闭程序再打开程序只进入该方法！*/
@Override
public void onDenied(List<String> deniedPermissions) {
deniedPermissionList = deniedPermissions;
for (String deniedPermission : deniedPermissionList) {
Log.e(TAG,"被拒绝权限：" + deniedPermission);
}
}
});
}
}静态权限
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
<uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />2、 设备是否支持
使用蓝牙之前，首先要检查当前手机是否支持BLE蓝牙。 如果支持BLE蓝牙，检查手机蓝牙是否已开启。如果没有开启，则需要先打开蓝牙。打开手机蓝牙，有两种方式，一种是直接enable()打开，另外一种是提示用户打开，推荐第二种方式。
/**
* 检测手机是否支持4.0蓝牙
* @param context 上下文
* @return true--支持4.0 false--不支持4.0
*/
private boolean checkBle(Context context){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) { //API 18 Android 4.3
bluetoothManager = (BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE);
if(bluetoothManager == null){
return false;
}
bluetooth4Adapter = bluetoothManager.getAdapter(); //BLUETOOTH权限
if(bluetooth4Adapter == null){
return false;
}else{
Log.d(TAG,"该设备支持蓝牙4.0");
return true;
}
}else{
return false;
}
}/**
* 获取蓝牙状态
*/
public boolean isEnable(){
if(bluetooth4Adapter == null){
return false;
}
return bluetooth4Adapter.isEnabled();
}
/**
* 打开蓝牙
* @param isFast true 直接打开蓝牙 false 提示用户打开
*/
public void openBluetooth(Context context,boolean isFast){
if(!isEnable()){
if(isFast){
Log.d(TAG,"直接打开手机蓝牙");
bluetooth4Adapter.enable(); //BLUETOOTH_ADMIN权限
}else{
Log.d(TAG,"提示用户去打开手机蓝牙");
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
context.startActivity(enableBtIntent);
}
}else{
Log.d(TAG,"手机蓝牙状态已开");
}
}3、搜索设备
搜索蓝牙：搜索蓝牙，回调接口中查看ble设备相关信息，一定时间停止扫描 扫描设备是耗时的操作，一旦扫描结束，就要及时停止扫描。
//扫描设备
//扫描设备回调
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
private BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() {
@Override
public void onLeScan(BluetoothDevice bluetoothDevice, int rssi, byte[] bytes) {
//在onLeScan()回调中尽量做少的操作，可以将扫描到的设备扔到另一个线程中处理
if(bluetoothDevice == null)
return;
if(bluetoothDevice.getName() != null){
Log.d(TAG,bluetoothDevice.getName() + "-->" + bluetoothDevice.getAddress());
}else{
Log.d(TAG,"null" + "-->" + bluetoothDevice.getAddress());
}
BLEDevice bleDevice = new BLEDevice(bluetoothDevice,rssi);
if(onDeviceSearchListener != null){
onDeviceSearchListener.onDeviceFound(bleDevice); //扫描到设备回调
}
}
};
/**
* 设置时间段 扫描设备
* @param onDeviceSearchListener 设备扫描监听
* @param scanTime 扫描时间
*/
public void startDiscoveryDevice(OnDeviceSearchListener onDeviceSearchListener,long scanTime){
if(bluetooth4Adapter == null){
Log.e(TAG,"startDiscoveryDevice-->bluetooth4Adapter == null");
return;
}
this.onDeviceSearchListener = onDeviceSearchListener;
if(onDeviceSearchListener != null){
onDeviceSearchListener.onDiscoveryStart(); //开始扫描回调
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
Log.d(TAG,"开始扫描设备");
bluetooth4Adapter.startLeScan(leScanCallback);
}else{
return;
}
//设定最长扫描时间
mHandler.postDelayed(stopScanRunnable,scanTime);
}
private Runnable stopScanRunnable = new Runnable() {
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
@Override
public void run() {
if(onDeviceSearchListener != null){
onDeviceSearchListener.onDiscoveryOutTime(); //扫描超时回调
}
//scanTime之后还没有扫描到设备，就停止扫描。
stopDiscoveryDevice();
}
};4、建立连接
扫描到目标设备之后，开始建立连接 这里注意，连接之前一定要关闭扫描，否则会影响连接。BLE与经典蓝牙不同，经典蓝牙一旦建立连接，就可以进行数据通讯，而BLE建立连接之后，还需要发现系统服务，获取特定服务及读写特征。
（1）建立连接 & 发现系统服务
//执行连接
//连接/通讯结果回调
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
private BluetoothGattCallback bluetoothGattCallback = new BluetoothGattCallback() {
@Override
public void onPhyUpdate(BluetoothGatt gatt, int txPhy, int rxPhy, int status) {
super.onPhyUpdate(gatt, txPhy, rxPhy, status);
}
@Override
public void onPhyRead(BluetoothGatt gatt, int txPhy, int rxPhy, int status) {
super.onPhyRead(gatt, txPhy, rxPhy, status);
}
//连接状态回调-连接成功/断开连接
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
super.onConnectionStateChange(gatt, status, newState);
Log.d(TAG,"status:" + status);
Log.d(TAG,"newState:" + newState);
switch(status){
case BluetoothGatt.GATT_SUCCESS:
Log.w(TAG,"BluetoothGatt.GATT_SUCCESS");
break;
case BluetoothGatt.GATT_FAILURE:
Log.w(TAG,"BluetoothGatt.GATT_FAILURE");
break;
case BluetoothGatt.GATT_CONNECTION_CONGESTED:
Log.w(TAG,"BluetoothGatt.GATT_CONNECTION_CONGESTED");
break;
case BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION:
Log.w(TAG,"BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION");
break;
case BluetoothGatt.GATT_INSUFFICIENT_ENCRYPTION:
Log.w(TAG,"BluetoothGatt.GATT_INSUFFICIENT_ENCRYPTION");
break;
case BluetoothGatt.GATT_INVALID_OFFSET:
Log.w(TAG,"BluetoothGatt.GATT_INVALID_OFFSET");
break;
case BluetoothGatt.GATT_READ_NOT_PERMITTED:
Log.w(TAG,"BluetoothGatt.GATT_READ_NOT_PERMITTED");
break;
case BluetoothGatt.GATT_REQUEST_NOT_SUPPORTED:
Log.w(TAG,"BluetoothGatt.GATT_REQUEST_NOT_SUPPORTED");
break;
}
BluetoothDevice bluetoothDevice = gatt.getDevice();
Log.d(TAG,"连接的设备：" + bluetoothDevice.getName() + " " + bluetoothDevice.getAddress());
isConnectIng = false;
//移除连接超时
mHandler.removeCallbacks(connectOutTimeRunnable);
if(newState == BluetoothGatt.STATE_CONNECTED){
Log.w(TAG,"连接成功");
//连接成功去发现服务
gatt.discoverServices();
//设置发现服务超时时间
mHandler.postDelayed(serviceDiscoverOutTimeRunnable,MAX_CONNECT_TIME);
if(onBleConnectListener != null){
onBleConnectListener.onConnectSuccess(gatt,bluetoothDevice,status); //连接成功回调
}
}else if(newState == BluetoothGatt.STATE_DISCONNECTED) {
//清空系统缓存
ClsUtils.refreshDeviceCache(gatt);
Log.e(TAG, "断开连接status:" + status);
gatt.close(); //断开连接释放连接
if(status == 133){
//无法连接
if(onBleConnectListener != null){
onBleConnectListener.onConnectFailure(gatt,bluetoothDevice,"连接异常！",status); //133连接异常 异常断开
Log.e(TAG,"连接失败status：" + status + " " + bluetoothDevice.getAddress());
}
}else if(status == 62){
//成功连接没有发现服务断开
if(onBleConnectListener != null){
onBleConnectListener.onConnectFailure(gatt,bluetoothDevice,"连接成功服务未发现断开！",status); //62没有发现服务 异常断开
Log.e(TAG,"连接成功服务未发现断开status:" + status);
}
}else if(status == 0){
if(onBleConnectListener != null){
onBleConnectListener.onDisConnectSuccess(gatt,bluetoothDevice,status); //0正常断开 回调
}
}else if(status == 8){
//因为距离远或者电池无法供电断开连接
// 已经成功发现服务
if(onBleConnectListener != null){
onBleConnectListener.onDisConnectSuccess(gatt,bluetoothDevice,status); //8断电断开 回调
}
}else if(status == 34){
if(onBleConnectListener != null){
onBleConnectListener.onDisConnectSuccess(gatt,bluetoothDevice,status); //34断开
}
}else {
//其它断开连接
if(onBleConnectListener != null){
onBleConnectListener.onDisConnectSuccess(gatt,bluetoothDevice,status); //其它断开
}
}
}else if(newState == BluetoothGatt.STATE_CONNECTING){
Log.d(TAG,"正在连接...");
if(onBleConnectListener != null){
onBleConnectListener.onConnecting(gatt,bluetoothDevice); //正在连接回调
}
}else if(newState == BluetoothGatt.STATE_DISCONNECTING){
Log.d(TAG,"正在断开...");
if(onBleConnectListener != null){
onBleConnectListener.onDisConnecting(gatt,bluetoothDevice); //正在断开回调
}
}
}
//发现服务
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
super.onServicesDiscovered(gatt, status);
//移除发现服务超时
mHandler.removeCallbacks(serviceDiscoverOutTimeRunnable);
Log.d(TAG,"移除发现服务超时");
Log.d(TAG,"发现服务");
//获取特定服务及特征
if(setupService(gatt,serviceUUID,readUUID,writeUUID)){
if(onBleConnectListener != null){
onBleConnectListener.onServiceDiscoverySucceed(gatt,gatt.getDevice(),status); //成功发现服务回调
}
}else{
if(onBleConnectListener != null){
onBleConnectListener.onServiceDiscoveryFailed(gatt,gatt.getDevice(),"获取服务特征异常"); //发现服务失败回调
}
}
}
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
super.onCharacteristicRead(gatt, characteristic, status);
Log.d(TAG,"读status: " + status);
}
//向蓝牙设备写入数据结果回调
@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
super.onCharacteristicWrite(gatt, characteristic, status);
if(characteristic.getValue() == null){
Log.e(TAG,"characteristic.getValue() == null");
return;
}
//将收到的字节数组转换成十六进制字符串
String msg = TypeConversion.bytes2HexString(characteristic.getValue(),characteristic.getValue().length);
if(status == BluetoothGatt.GATT_SUCCESS){
//写入成功
Log.w(TAG,"写入成功：" + msg);
if(onBleConnectListener != null){
onBleConnectListener.onWriteSuccess(gatt,gatt.getDevice(),characteristic.getValue()); //写入成功回调
}
}else if(status == BluetoothGatt.GATT_FAILURE){
//写入失败
Log.e(TAG,"写入失败：" + msg);
if(onBleConnectListener != null){
onBleConnectListener.onWriteFailure(gatt,gatt.getDevice(),characteristic.getValue(),"写入失败"); //写入失败回调
}
}else if(status == BluetoothGatt.GATT_WRITE_NOT_PERMITTED){
//没有权限
Log.e(TAG,"没有权限！");
}
}
//读取蓝牙设备发出来的数据回调
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
super.onCharacteristicChanged(gatt, characteristic);
//接收数据
byte[] bytes = characteristic.getValue();
Log.w("TAG","收到数据str:" + TypeConversion.bytes2HexString(bytes,bytes.length));
if(onBleConnectListener != null){
onBleConnectListener.onReceiveMessage(gatt,gatt.getDevice(),characteristic,characteristic.getValue()); //接收数据回调
}
}
@Override
public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
super.onDescriptorRead(gatt, descriptor, status);
}
@Override
public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
super.onDescriptorWrite(gatt, descriptor, status);
}
@Override
public void onReliableWriteCompleted(BluetoothGatt gatt, int status) {
super.onReliableWriteCompleted(gatt, status);
Log.d(TAG,"onReliableWriteCompleted");
}
@Override
public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
super.onReadRemoteRssi(gatt, rssi, status);
if(status == BluetoothGatt.GATT_SUCCESS){
Log.w(TAG,"读取RSSI值成功，RSSI值：" + rssi + ",status" + status);
if(onBleConnectListener != null){
onBleConnectListener.onReadRssi(gatt,rssi,status); //成功读取连接的信号强度回调
}
}else if(status == BluetoothGatt.GATT_FAILURE){
Log.w(TAG,"读取RSSI值失败，status：" + status);
}
}
//修改MTU值结果回调
@Override
public void onMtuChanged(BluetoothGatt gatt, int mtu, int status) {
super.onMtuChanged(gatt, mtu, status);
///设置mtu值，即bluetoothGatt.requestMtu()时触发，提示该操作是否成功
if(status == BluetoothGatt.GATT_SUCCESS){ //设置MTU成功
//MTU默认取的是23，当收到 onMtuChanged 后，会根据传递的值修改MTU，注意由于传输用掉3字节，因此传递的值需要减3。
//mtu - 3
Log.w(TAG,"设置MTU成功，新的MTU值：" + (mtu-3) + ",status" + status);
if(onBleConnectListener != null){
onBleConnectListener.onMTUSetSuccess("设置后新的MTU值 = " + (mtu-3) + " status = " + status,mtu - 3); //MTU设置成功
}
}else if(status == BluetoothGatt.GATT_FAILURE){ //设置MTU失败
Log.e(TAG,"设置MTU值失败：" + (mtu-3) + ",status" + status);
if(onBleConnectListener != null){
onBleConnectListener.onMTUSetFailure("设置MTU值失败：" + (mtu-3) + " status：" + status); //MTU设置失败
}
}
}
};
/**
* 通过蓝牙设备连接
* @param context 上下文
* @param bluetoothDevice 蓝牙设备
* @param outTime 连接超时时间
* @param onBleConnectListener 蓝牙连接监听者
* @return
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public BluetoothGatt connectBleDevice(Context context, BluetoothDevice bluetoothDevice, long outTime,OnBleConnectListener onBleConnectListener){
if(bluetoothDevice == null){
Log.e(TAG,"addBLEConnectDevice-->bluetoothDevice == null");
return null;
}
this.onBleConnectListener = onBleConnectListener;
this.curConnDevice = bluetoothDevice;
Log.d(TAG,"开始准备连接：" + bluetoothDevice.getName() + "-->" + bluetoothDevice.getAddress());
//出现 BluetoothGatt.android.os.DeadObjectException 蓝牙没有打开
try{
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
mBluetoothGatt = bluetoothDevice.connectGatt(context, false, bluetoothGattCallback,
BluetoothDevice.TRANSPORT_LE,BluetoothDevice.PHY_LE_1M_MASK);
}else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
mBluetoothGatt = bluetoothDevice.connectGatt(context, false, bluetoothGattCallback,
BluetoothDevice.TRANSPORT_LE);
} else {
mBluetoothGatt = bluetoothDevice.connectGatt(context, false, bluetoothGattCallback);
}
}catch(Exception e){
Log.e(TAG,"e:" + e.getMessage());
}
mHandler.postDelayed(connectOutTimeRunnable,outTime);
return mBluetoothGatt;
}
//连接超时
private Runnable connectOutTimeRunnable = new Runnable() {
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
@Override
public void run() {
if(mBluetoothGatt == null){
Log.e(TAG,"connectOuttimeRunnable-->mBluetoothGatt == null");
return;
}
isConnectIng = false;
mBluetoothGatt.disconnect();
//连接超时当作连接失败回调
if(onBleConnectListener != null){
onBleConnectListener.onConnectFailure(mBluetoothGatt,curConnDevice,"连接超时！",-1); //连接失败回调
}
}
};
//发现服务超时
private Runnable serviceDiscoverOutTimeRunnable = new Runnable() {
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
@Override
public void run() {
if(mBluetoothGatt == null){
Log.e(TAG,"connectOuttimeRunnable-->mBluetoothGatt == null");
return;
}
isConnectIng = false;
mBluetoothGatt.disconnect();
//发现服务超时当作连接失败回调
if(onBleConnectListener != null){
onBleConnectListener.onConnectFailure(mBluetoothGatt,curConnDevice,"发现服务超时！",-1); //连接失败回调
}
}
};2）发现系统服务之后，还需要获取特定服务及读写特征才能进行数据通讯。 一般，读特征是用来读取蓝牙设备发出来的数据，写特征是向蓝牙设备写入数据，其中，读特征一定要设置打开通知，否则接收不到消息。
/**
* 获取特定服务及特征
* 1个serviceUUID -- 1个readUUID -- 1个writeUUID
* @param bluetoothGatt
* @param serviceUUID
* @param readUUID
* @param writeUUID
* @return
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
private boolean setupService(BluetoothGatt bluetoothGatt,String serviceUUID,String readUUID,String writeUUID) {
if (bluetoothGatt == null) {
Log.e(TAG, "setupService()-->bluetoothGatt == null");
return false;
}
if(serviceUUID == null){
Log.e(TAG, "setupService()-->serviceUUID == null");
return false;
}
for (BluetoothGattService service : bluetoothGatt.getServices()) {
// Log.d(TAG, "service = " + service.getUuid().toString());
if (service.getUuid().toString().equals(serviceUUID)) {
bluetoothGattService = service;
}
}
//通过上面方法获取bluetoothGattService
// bluetoothGattService = bleManager.getBluetoothGattService(bluetoothGatt,ConsData.MY_BLUETOOTH4_UUID);
if (bluetoothGattService == null) {
Log.e(TAG, "setupService()-->bluetoothGattService == null");
return false;
}
Log.d(TAG, "setupService()-->bluetoothGattService = " + bluetoothGattService.toString());
if(readUUID == null || writeUUID == null){
Log.e(TAG, "setupService()-->readUUID == null || writeUUID == null");
return false;
}
for (BluetoothGattCharacteristic characteristic : bluetoothGattService.getCharacteristics()) {
if (characteristic.getUuid().toString().equals(readUUID)) { //读特征
readCharacteristic = characteristic;
} else if (characteristic.getUuid().toString().equals(writeUUID)) { //写特征
writeCharacteristic = characteristic;
}
}
if (readCharacteristic == null) {
Log.e(TAG, "setupService()-->readCharacteristic == null");
return false;
}
if (writeCharacteristic == null) {
Log.e(TAG, "setupService()-->writeCharacteristic == null");
return false;
}
//打开读通知
enableNotification(true, bluetoothGatt, readCharacteristic);
//重点中重点，需要重新设置
List<BluetoothGattDescriptor> descriptors = readCharacteristic.getDescriptors();
for (BluetoothGattDescriptor descriptor : descriptors) {
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
bluetoothGatt.writeDescriptor(descriptor);
}
//延迟2s，保证所有通知都能及时打开
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
}
}, 2000);
return true;
}
// 打开通知
/**
* 设置读特征接收通知
* @param enable 为true打开通知
* @param gatt 连接
* @param characteristic 特征
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public void enableNotification(boolean enable, BluetoothGatt gatt, BluetoothGattCharacteristic characteristic){
if(gatt == null){
Log.e(TAG,"enableNotification-->gatt == null");
return;
}
if(characteristic == null){
Log.e(TAG,"enableNotification-->characteristic == null");
return;
}
//这一步必须要有，否则接收不到通知
gatt.setCharacteristicNotification(characteristic,enable);
}5、数据通讯
（1）发送数据 mBluetoothGatt.writeCharacteristic()方法的返回值，并不能真正的表示数据是否发送成功，而是通过BluetoothGattCallback回调方法onCharacteristicWrite()来判断数据是否已成功写入底层。
//向蓝牙设备写入数据结果回调
@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
super.onCharacteristicWrite(gatt, characteristic, status);
if(characteristic.getValue() == null){
Log.e(TAG,"characteristic.getValue() == null");
return;
}
//将收到的字节数组转换成十六进制字符串
String msg = TypeConversion.bytes2HexString(characteristic.getValue(),characteristic.getValue().length);
if(status == BluetoothGatt.GATT_SUCCESS){
//写入成功
Log.w(TAG,"写入成功：" + msg);
if(onBleConnectListener != null){
onBleConnectListener.onWriteSuccess(gatt,gatt.getDevice(),characteristic.getValue()); //写入成功回调
}
}else if(status == BluetoothGatt.GATT_FAILURE){
//写入失败
Log.e(TAG,"写入失败：" + msg);
if(onBleConnectListener != null){
onBleConnectListener.onWriteFailure(gatt,gatt.getDevice(),characteristic.getValue(),"写入失败"); //写入失败回调
}
}else if(status == BluetoothGatt.GATT_WRITE_NOT_PERMITTED){
//没有权限
Log.e(TAG,"没有权限！");
}
}/// 发送数据 ///
/**
* 发送消息 byte[]数组
* @param msg 消息
* @return true false
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public boolean sendMessage( byte[] msg){
if(writeCharacteristic == null){
Log.e(TAG,"sendMessage(byte[])-->writeGattCharacteristic == null");
return false;
}
if(mBluetoothGatt == null){
Log.e(TAG,"sendMessage(byte[])-->mBluetoothGatt == null");
return false;
}
boolean b = writeCharacteristic.setValue(msg);
Log.d(TAG, "写特征设置值结果：" + b);
return mBluetoothGatt.writeCharacteristic(writeCharacteristic);
}（2）接收数据 接收的数据是直接通过BluetoothGattCallback回调方法onCharacteristicChanged()来获取的。
//读取蓝牙设备发出来的数据回调
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
super.onCharacteristicChanged(gatt, characteristic);
//接收数据
byte[] bytes = characteristic.getValue();
Log.w("TAG","收到数据str:" + TypeConversion.bytes2HexString(bytes,bytes.length));
if(onBleConnectListener != null){
onBleConnectListener.onReceiveMessage(gatt,gatt.getDevice(),characteristic,characteristic.getValue()); //接收数据回调
}
}6、断开连接
BLE通讯结束之后，需要及时断开连接,并且在断开连接的回调处释放资源。否则会导致下一次执行连接操作时，导致133异常。所以，一般连接出现133异常，都是因为断开后及时释放资源。
断开连接的结果是在BluetoothGattCallback回调方法onConnectionStateChange()来获取的。（可查看上面建立连接处的代码）
/// 断开连接 ///
/**
* 断开连接
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public void disConnectDevice(){
if(mBluetoothGatt == null){
Log.e(TAG,"disConnectDevice-->bluetoothGatt == null");
return;
}
//系统断开
mBluetoothGatt.disconnect();
}7、过程中遇到过的实际问题
暂无