我想知道 BLE gatt 的设置完成时间，比如回调
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【中文标题】我想知道 BLE gatt 的设置完成时间，比如回调【英文标题】：I want to know the finished time of setting of BLE gatt like callback 【发布时间】：2019-09-25 04:35:33 【问题描述】：我英语不好。敬请谅解。
我想知道蓝牙设置何时完成。我想在蓝牙连接和设置完成后向我的设备发送数据。我如何知道流打开何时完成？
当我尝试了所有 BLE 设置时，我只睡了几秒钟，但我想将其更改为顺序代码。
private class GattClientCallback extends BluetoothGattCallback
@Override
public void onServicesDiscovered( BluetoothGatt _gatt, int _status )
super.onServicesDiscovered( _gatt, _status );
// check if the discovery failed
if( _status != BluetoothGatt.GATT_SUCCESS )
Log.e( TAG, "Device service discovery failed, status: " + _status );
return;
// find discovered characteristics
List<BluetoothGattCharacteristic> matching_characteristics= BluetoothUtils.findBLECharacteristics(_gatt);
if( matching_characteristics.isEmpty() )
Log.e( TAG, "Unable to find characteristics" );
return;
// log for successful discovery
Log.d( TAG, "Services discovery is successful" );
// find command characteristics from the GATT server
cmd_characteristic= BluetoothUtils.findCommandCharacteristic( ble_gatt_ );
//setCharacteristicNotification
ble_gatt_.setCharacteristicNotification(cmd_characteristic, true);
BluetoothGattDescriptor descriptor = cmd_characteristic.getDescriptor(CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID);
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
ble_gatt_.writeDescriptor(descriptor); //descriptor write operation successfully started?
// stream open complete.
// update the connection status message
msg_handler(SET_TV_STATUS,"connection complete");
String result = pref.getString("first_device", "0");
if(result.equals("0"))
ble_info.startScan();
else
ble_info.connectSavedDevice();
packet_sleep(5000); //I have to send data after ble connecting finished.
if(!ble_info.connected_)
return;
while(ble_info.connected_ && state_check != ACK_COMM_START)
ble_info.sendData(SET_COMM_START);
packet_sleep(ACK_TERM);
ble_info 类
public class BluetoothInfo
protected static final int SET_TV_STATUS = 0;
protected static final int SET_TV_CONNECTION = 1;
protected static final UUID CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
protected static PacketReceive packetReceive = new PacketReceive();
//-------------------------------
//mac address
public String devAddress;
// ble adapter
public BluetoothAdapter ble_adapter_;
// flag for scanning
public boolean is_scanning_= false;
// flag for connection
public boolean connected_= false;
// scan results
public Map<String, BluetoothDevice> scan_results_;
// scan callback
public ScanCallback scan_cb_;
// ble scanner
public BluetoothLeScanner ble_scanner_;
// scan handler
public Handler scan_handler_;
// BLE Gatt
public BluetoothGatt ble_gatt_;
BluetoothGattCharacteristic cmd_characteristic;
// to save data
SharedPreferences pref;
SharedPreferences.Editor editor;
//constructor
BluetoothInfo(BluetoothManager ble_manager, SharedPreferences pref)
ble_adapter_= ble_manager.getAdapter();
ble_scanner_ = ble_adapter_.getBluetoothLeScanner();
//to save data
this.pref = pref;
@RequiresApi(api = Build.VERSION_CODES.M)
public void startScan()
// check if location permission
if (context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
requestLocationPermission();
Log.d(TAG, "Scanning Failed: no fine location permission");
return;
// disconnect gatt server
disconnectGattServer();
scan_handler_= new Handler();
scan_handler_.postDelayed( this::stopScan, SCAN_PERIOD );
scan_results_= new HashMap<>();
scan_cb_= new BLEScanCallback( scan_results_ );
Log.d(TAG,"Scanning...");
// check ble adapter and ble enabled
if (ble_adapter_ == null || !ble_adapter_.isEnabled())
requestEnableBLE();
Log.d(TAG, "Scanning Failed: ble not enabled");
return;
// now ready to scan
ble_scanner_.startScan(scan_cb_); //scan filter 사용x
// set scanning flag
is_scanning_= true;
/*
Stop scanning
*/
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void stopScan()
// check pre-conditions
if( is_scanning_ && ble_adapter_ != null && ble_adapter_.isEnabled() && ble_scanner_ != null )
// stop scanning
ble_scanner_.stopScan( scan_cb_ );
scanComplete();
// reset flags
scan_cb_= null;
is_scanning_= false;
scan_handler_= null;
Log.d(TAG,"scanning stopped");
/*
Handle scan results after scan stopped
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
private void scanComplete()
Toast.makeText(context, "scan finished", Toast.LENGTH_LONG).show();
// check if nothing found
if( scan_results_.isEmpty() )
Log.d( TAG, "scan results is empty" );
return;
ArrayList<BluetoothDevice> found_devices = new ArrayList<>();
ArrayList<String> found_devices_names = new ArrayList<>();
// loop over the scan results and connect to them
for( String device_name : scan_results_.keySet() )
Log.d( TAG, "Found device: " + device_name );
if(device_name==null)
continue;
BluetoothDevice device= scan_results_.get( device_name );
if( device_name.contains( BLE_NAME) )
found_devices.add(device);
found_devices_names.add(device_name);
// exist device
if(found_devices.size() >= 1)
CharSequence[] items = found_devices_names.toArray(new String[found_devices_names.size()]);
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("select device");
builder.setItems(items, new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int pos)
String selectedText = items[pos].toString();
connectDevice(found_devices.get(pos));
Toast.makeText(context, selectedText, Toast.LENGTH_SHORT).show();
);
builder.show();
else
Toast.makeText(context, "not found", Toast.LENGTH_SHORT).show();
/*
Connect to the ble device
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
private void connectDevice(BluetoothDevice _device )
// update the status
msg_handler(SET_TV_CONNECTION, "connecting");
devAddress = _device.getAddress();
editor = pref.edit();
editor.putString("first_device",devAddress);
editor.apply();
Log.d(TAG,"Connecting to " + devAddress);
GattClientCallback gatt_client_cb= new GattClientCallback();
ble_gatt_= _device.connectGatt( context, false, gatt_client_cb );// %CONNECT%
/*
Disconnect Gatt Server
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public void disconnectGattServer()
Log.d( TAG, "Closing Gatt connection" );
msg_handler(SET_TV_STATUS,"disconnect");
// reset the connection flag
connected_= false;
// disconnect and close the gatt
if( ble_gatt_ != null )
ble_gatt_.disconnect();
ble_gatt_.close();
/*
Request BLE enable
*/
private void requestEnableBLE()
Intent ble_enable_intent= new Intent( BluetoothAdapter.ACTION_REQUEST_ENABLE );
((MainActivity)context).startActivityForResult( ble_enable_intent, REQUEST_ENABLE_BT );
/*
Request Fine Location permission
*/
@RequiresApi(api = Build.VERSION_CODES.M)
private void requestLocationPermission()
((MainActivity)context).requestPermissions( new String[] Manifest.permission.ACCESS_FINE_LOCATION, REQUEST_FINE_LOCATION );
/*
connect to the saved device
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public boolean connectSavedDevice()
String result = pref.getString("first_device", "0");
if(result.equals("0"))
Log.d(TAG,"no saved device");
return false;
BluetoothDevice device = ble_adapter_.getRemoteDevice(result);
GattClientCallback gatt_client_cb= new GattClientCallback();
ble_gatt_= device.connectGatt( context, false, gatt_client_cb ); // %connect%뜨는거
return true;
/*
Send Data
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public void sendData(byte[] strByte)
// check connection
if( !connected_ )
Log.e( TAG, "Failed to sendData due to no connection" );
return;
// disconnect if the characteristic is not found
if( cmd_characteristic == null )
Log.e( TAG, "Unable to find cmd characteristic" );
disconnectGattServer();
return;
System.out.print("len : " + strByte.length + "->");
for(int i=0;i<strByte.length;i++)
System.out.print((int)strByte[i] + " ");
System.out.println();
// start stimulation
startStimulation( cmd_characteristic, strByte );
/*
Start stimulation
@param cmd_characteristic command characteristic instance
@param program_id stimulation program id
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
private void startStimulation(BluetoothGattCharacteristic _cmd_characteristic, byte[] strByte )
_cmd_characteristic.setValue( strByte );
boolean success= ble_gatt_.writeCharacteristic( _cmd_characteristic );
if( success )
Log.d( TAG, "send data complete" );
else
Log.e( TAG, "Failed to write command" );
final Handler handler = new Handler()
public void handleMessage(Message msg)
switch(msg.what)
case SET_TV_STATUS:
((MainActivity)context).tv_status_handler(msg.obj.toString());
break;
case SET_TV_CONNECTION:
((MainActivity)context).tv_connection_handler(msg.obj.toString());
break;
;
public void msg_handler(int set_tv, String text)
Message msg = handler.obtainMessage();
msg.what = set_tv;
msg.obj = text;
handler.sendMessage(msg);
return;
/*
BLE Scan Callback class
*/
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private class BLEScanCallback extends ScanCallback
private Map<String, BluetoothDevice> cb_scan_results_;
/*
Constructor
*/
BLEScanCallback( Map<String, BluetoothDevice> _scan_results )
cb_scan_results_= _scan_results;
@Override
public void onScanResult( int _callback_type, ScanResult _result )
Log.d( TAG, "onScanResult" );
addScanResult( _result );
@Override
public void onBatchScanResults( List<ScanResult> _results )
for( ScanResult result: _results )
addScanResult( result );
@Override
public void onScanFailed( int _error )
Log.e( TAG, "BLE scan failed with code " +_error );
/*
Add scan result
*/
private void addScanResult( ScanResult _result )
// get scanned device
BluetoothDevice device= _result.getDevice();
// save devices for name
String device_name = device.getName();
// add the device to the result list
cb_scan_results_.put( device_name, device );
// log
Log.d( TAG, "scan results device: " + device_name );
msg_handler(SET_TV_STATUS,"scanned device : " + device_name);
/*
Gatt Client Callback class
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
private class GattClientCallback extends BluetoothGattCallback
// @Override
// public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status)
// super.onDescriptorWrite(gatt, descriptor, status);
//
@Override
public void onConnectionStateChange(BluetoothGatt _gatt, int _status, int _new_state )
super.onConnectionStateChange( _gatt, _status, _new_state );
if( _status == BluetoothGatt.GATT_FAILURE )
disconnectGattServer();
return;
else if( _status != BluetoothGatt.GATT_SUCCESS )
disconnectGattServer();
return;
if( _new_state == BluetoothProfile.STATE_CONNECTED )
// // 연결완료 되었을 시 1. set communication, 2. get standby state, 3. get basic data 동기화하기.
// sendData(SET_COMM_START);
// MainActivity.packet_sleep(200);
// sendData(GET_STANDBY_STATE); //get airtop standby state(1.3)
// MainActivity.packet_sleep(200);
// if(airtopDevice.standby_state == ACTIVE_STATE) //device active 상태이면 basic data 확인
// sendData(GET_BASIC_DATA); //get airtop basic data(1.1)
// // update the connection status message
// msg_handler(SET_TV_STATUS,"연결 완료");
// msg_handler(SET_TV_CONNECTION,"연결됨");
// set the connection flag
connected_= true;
Log.d( TAG, "Connected to the GATT server" );
_gatt.discoverServices();
else if ( _new_state == BluetoothProfile.STATE_DISCONNECTED )
disconnectGattServer();
@Override
public void onServicesDiscovered( BluetoothGatt _gatt, int _status )
super.onServicesDiscovered( _gatt, _status );
// check if the discovery failed
if( _status != BluetoothGatt.GATT_SUCCESS )
Log.e( TAG, "Device service discovery failed, status: " + _status );
return;
// find discovered characteristics
List<BluetoothGattCharacteristic> matching_characteristics= BluetoothUtils.findBLECharacteristics(_gatt);
if( matching_characteristics.isEmpty() )
Log.e( TAG, "Unable to find characteristics" );
return;
// log for successful discovery
Log.d( TAG, "Services discovery is successful" );
// find command characteristics from the GATT server
cmd_characteristic= BluetoothUtils.findCommandCharacteristic( ble_gatt_ );
//setCharacteristicNotification
ble_gatt_.setCharacteristicNotification(cmd_characteristic, true);
BluetoothGattDescriptor descriptor = cmd_characteristic.getDescriptor(CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID);
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
ble_gatt_.writeDescriptor(descriptor); //descriptor write operation successfully started?
// stream open complete.
// update the connection status message
msg_handler(SET_TV_STATUS,"connect complete");
// stream open 이후 send data -> main에서 sleep 이후 보내줌.
// sendData(SET_COMM_START);
// MainActivity.packet_sleep(200);
// sendData(GET_STANDBY_STATE); //get airtop standby state(1.3)
// MainActivity.packet_sleep(200);
// if(airtopDevice.standby_state == ACTIVE_STATE) //device active 상태이면 basic data 확인
// sendData(GET_BASIC_DATA); //get airtop basic data(1.1)
@Override
public void onCharacteristicChanged( BluetoothGatt _gatt, BluetoothGattCharacteristic _characteristic )
super.onCharacteristicChanged( _gatt, _characteristic );
Log.d( TAG, "characteristic changed: " + _characteristic.getUuid().toString() );
readCharacteristic( _characteristic );
@Override
public void onCharacteristicWrite( BluetoothGatt _gatt, BluetoothGattCharacteristic _characteristic, int _status )
super.onCharacteristicWrite( _gatt, _characteristic, _status );
if( _status == BluetoothGatt.GATT_SUCCESS )
Log.d( TAG, "Characteristic written successfully" );
else
Log.e( TAG, "Characteristic write unsuccessful, status: " + _status) ;
disconnectGattServer();
@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status)
super.onCharacteristicRead(gatt, characteristic, status);
if (status == BluetoothGatt.GATT_SUCCESS)
Log.d (TAG, "Characteristic read successfully" );
readCharacteristic(characteristic);
else
Log.e( TAG, "Characteristic read unsuccessful, status: " + status);
// Trying to read from the Time Characteristic? It doesnt have the property or permissions
// set to allow this. Normally this would be an error and you would want to:
// disconnectGattServer();
/*
Log the value of the characteristic
@param characteristic
*/
private void readCharacteristic( BluetoothGattCharacteristic _characteristic )
byte[] msg = _characteristic.getValue();
String str = new String(msg);
for(int i=0;i<str.length();i++)
packetReceive.input_byte(str.charAt(i));
String prt = new String();
for(int i=0;i<msg.length;i++)
prt += " "+(int)msg[i];
Log.d(TAG,"msg len"+msg.length + ": " +prt);
【问题讨论】：
when the bluetooth setting completed 哪个设置？你到底想要什么回调？
我的意思是设置特征和写入描述符。这些完成后我必须发送数据。所以我想要这个回调。
我在下面添加了连接部分代码。在“ble_info.connectSavedDevice();”之后，当我发送数据“ble_info.sendData(SET_COMM_START);”之后，他们使发送失败错误。所以我睡了好几次。然后发送没有出错。在这种情况下，我想按顺序制作代码。
ble_info 是什么，connectSavedDevice 有什么作用？
我在下面添加了 ble_info 类代码。此类包含蓝牙功能。并且connectSavedDevice通过gatt的mac地址与设备连接。
【参考方案1】：
你可以实现onConnectionStateChange。这会让你知道你的连接是否成功。
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status,int newState)
if (newState == BluetoothProfile.STATE_CONNECTED)
// you can send data here
else if (newState == BluetoothProfile.STATE_DISCONNECTED)
【讨论】：
我添加了包含 GattClientCallback 的 ble_info 类代码。在代码的 onConnectionStateChange 方法中，我尝试了与注释相同的方法。但由于没有连接，发送数据失败。 连接到 BLE 时你得到哪个 newState？如果你得到 STATE_CONNECTED 那么你已经连接，所以你可以在那里发送数据，但要确保你有互联网连接，否则 api 将不会被调用。以上是关于我想知道 BLE gatt 的设置完成时间，比如回调的主要内容，如果未能解决你的问题，请参考以下文章