低功耗蓝牙的配置和使用
原文https://yq.aliyun.com/articles/668987
第二步里面有遇到133问题的解决方案，希望你们也有效
第一步（获取蓝牙适配管理类，检查是否开启蓝牙权限）
//获取系统蓝牙适配器管理类
private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter
.getDefaultAdapter();
private void initBluetooth() {
// 询问打开蓝牙
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
// Android M Permission check
if (this.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PERMISSION_REQUEST_COARSE_LOCATION);
}
}
if (mBluetoothAdapter != null && !mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
} else {
//拥有权限开始搜索低功耗蓝牙
mBluetoothAdapter.startLeScan(callback);
}
}
// 申请打开蓝牙请求的回调
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1) {
if (resultCode == RESULT_OK) {
//蓝牙已经开启
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
mBluetoothAdapter.startDiscovery();
}
} else if (resultCode == RESULT_CANCELED) {
finish();
}
}
}
第二步(获取扫描到的设备信息，通过device可以获取address和name，根据这个判断是否为目标device)
// 获取搜索到的蓝牙设备
private BluetoothAdapter.LeScanCallback callback = new BluetoothAdapter.LeScanCallback() {
@Override
public void onLeScan(BluetoothDevice device, int arg1, byte[] arg2) {
//device为扫描到的BLE设备
if (device.getAddress() != null && device.getName() != null && device.getName().startsWith("regex")) {
//获取目标设备
tagDevice = device;
mBluetoothAdapter.stopLeScan(callback);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
//Android6.0以上需要调用这个方法，如果6.0以上不用这个方法而是选择下面那个方法会出现133错误
mBluetoothGatt = tagDevice.connectGatt(ElectronicScale2Activity.this, false, gattCallback, TRANSPORT_LE);
}else{
mBluetoothGatt = tagDevice.connectGatt(ElectronicScale2Activity.this, false, gattCallback);
}
return;
}
}
};
6.0及以上系统的手机要使用bluetoothDevice.connectGatt(MainActivity.this,true, gattCallback, TRANSPORT_LE)，其中TRANSPORT_LE参数是设置传输层模式。传输层模式有三种TRANSPORT_AUTO 、TRANSPORT_BREDR 和TRANSPORT_LE。如果不传默认TRANSPORT_AUTO，6.0系统及以上需要使用TRANSPORT_LE这种传输模式，可能是因为Android6.0及以上系统重新定义了蓝牙BLE的传输模式必须使用TRANSPORT_LE这种方式
第三步(在下面的onCharacteristicChanged方法里面可以拿到设备发出的数据，根据规定格式解析即可)
private BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status,
int newState) {
if (status==BluetoothGatt.GATT_SUCCESS){
//连接成功
if (newState== BluetoothGatt.STATE_CONNECTED){
Log.e("Bluetooth","连接成功");
//发现服务
gatt.discoverServices();
}
}else{
//连接失败
Log.e("Bluetooth","失败=="+status);
mBluetoothGatt.close();
}
}
@Override
public void onCharacteristicWrite(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic, int status) {
super.onCharacteristicWrite(gatt, characteristic, status);
}
@Override
public void onDescriptorWrite(BluetoothGatt gatt,
BluetoothGattDescriptor descriptor, int status) {
}
;
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
//获取初始化服务和特征值
initServiceAndChara();
//订阅通知
mBluetoothGatt.setCharacteristicNotification(mBluetoothGatt
.getService(notify_UUID_service).getCharacteristic(notify_UUID_chara),true);
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic) {
// value为设备发送的数据，根据数据协议进行解析
byte[] value = characteristic.getValue();
}
};
//通过Android拿得到对应UUID
private void initServiceAndChara(){
List<BluetoothGattService> bluetoothGattServices= mBluetoothGatt.getServices();
for (BluetoothGattService bluetoothGattService:bluetoothGattServices){
List<BluetoothGattCharacteristic> characteristics=bluetoothGattService.getCharacteristics();
for (BluetoothGattCharacteristic characteristic:characteristics){
int charaProp = characteristic.getProperties();
if ((charaProp & BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
read_UUID_chara =characteristic.getUuid();
read_UUID_service =bluetoothGattService.getUuid();
//Log.e(TAG,"read_chara="+ read_UUID_chara +"----read_service="+ read_UUID_service);
}
if ((charaProp & BluetoothGattCharacteristic.PROPERTY_WRITE) > 0) {
write_UUID_chara =characteristic.getUuid();
write_UUID_service =bluetoothGattService.getUuid();
//Log.e(TAG,"write_chara="+ write_UUID_chara +"----write_service="+ write_UUID_service);
}
if ((charaProp & BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE) > 0) {
write_UUID_chara =characteristic.getUuid();
write_UUID_service =bluetoothGattService.getUuid();
//Log.e(TAG,"write_chara="+ write_UUID_chara +"----write_service="+ write_UUID_service);
}
if ((charaProp & BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
notify_UUID_chara =characteristic.getUuid();
notify_UUID_service =bluetoothGattService.getUuid();
//Log.e(TAG,"notify_chara="+ notify_UUID_chara +"----notify_service="+ notify_UUID_service);
}
if ((charaProp & BluetoothGattCharacteristic.PROPERTY_INDICATE) > 0) {
indicate_UUID_chara =characteristic.getUuid();
indicate_UUID_service =bluetoothGattService.getUuid();
//Log.e(TAG,"indicate_chara="+ indicate_UUID_chara +"----indicate_service="+ indicate_UUID_service);
}
}
}
}
读写操作什么暂时没用上，需要的去看原文吧，这篇文章仅用于自己记录观看
（原文https://yq.aliyun.com/articles/668987）
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