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我正在嘗試編寫和掃描BLE設備的Android應用程序，以及何時發現某些具有命名方案的設備連接到它並讀取特徵（用戶定義的名稱爲該設備）然後立即斷開連接。然後它會將設備顯示在列表中，並找到任何其他設備並讀取用戶定義的名稱。然後用戶可以選擇一個設備連接到（或多個設備）並連接到它並從中傳輸數據。Android BLE快速連接和斷開連接以讀取1個特徵。有些BLE設備在快速連接斷開連接後停止播放
繼續發生的問題是在獲取用戶定義的名稱並斷開連接後，BLE設備停止播放，並且當我掃描或在讀取用戶定義的名稱後嘗試連接時，我無法再找到它並斷開連接。
這是與Android BLE棧的問題，還是需要增加更多的延遲（我已遍及我使用bluetoothservice 100個毫秒的延遲）
這是我在服務中使用的部分代碼
public boolean initialize() {
Log.i(TAG, "Initializing");
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
if (mBluetoothManager == null) {
mBluetoothManager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
if (mBluetoothManager == null) {
Log.e(TAG, "Unable to initialize BluetoothManager.");
return false;
}
}
mBluetoothAdapter = mBluetoothManager.getAdapter();
if (mBluetoothAdapter == null) {
Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
return false;
}
mReadyToWrite = true;
mReadyToRead = true;
mReady = true;
mCharacteristicWriteQueue = new ArrayDeque<BluetoothGattCharacteristic>();
mCharacteristicReadQueue = new ArrayDeque<BluetoothGattCharacteristic>();
mDescriptorWriteQueue = new ArrayDeque<BluetoothGattDescriptor>();
mDescriptorReadQueue = new ArrayDeque<BluetoothGattDescriptor>();
//mBluetoothGattMap = new HashMap<String, BluetoothGatt>();
return true;
}
/**
* Connects to the GATT server hosted on the Bluetooth LE device.
*
* @param address The device address of the device.
*
* @return Return true if the connection is initiated successfully. The connection result
* is reported asynchronously through the
* {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
* callback.
*/
public boolean connect(final String address) {
if (mBluetoothAdapter == null || address == null) {
Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
return false;
}
if(mBluetoothGattMap.containsKey(address)) {
Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");
if (mBluetoothGattMap.get(address).connect()) {
mConnectionState = STATE_CONNECTING;
return true;
} else {
return false;
}
}
final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
if (device == null) {
Log.w(TAG, "Device not found. Unable to connect.");
return false;
}
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
mBluetoothGattMap.put(address, device.connectGatt(this, false, mGattCallback));
Log.d(TAG, "Trying to create a new connection to address " + address);
//mBluetoothDeviceAddress = address;
mConnectionState = STATE_CONNECTING;
return true;
}
/**
* Disconnects an existing connection or cancel a pending connection. The disconnection result
* is reported asynchronously through the
* {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
* callback.
*/
public void disconnect(String address) {
if (mBluetoothAdapter == null || !mBluetoothGattMap.containsKey(address)) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
Log.i(TAG, "Disconnecting from gatt");
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
mBluetoothGattMap.get(address).disconnect();
}
public void close(String address) {
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
mBluetoothGattMap.get(address).close();
mBluetoothGattMap.remove(address);
Log.w(TAG, "Succeeed removing it");
}
public int getConnectionState(String address) {
Log.i(TAG, "getting connection state for " + address);
BluetoothGatt gatt = mBluetoothGattMap.get(address);
return mBluetoothManager.getConnectionState(gatt.getDevice(), BluetoothProfile.GATT);
}
/**
* Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
* asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
* callback.
*
* @param characteristic The characteristic to read from.
*/
public void readCharacteristic(String address, BluetoothGattCharacteristic characteristic) {
Log.i(TAG, "reading characteristic");
if (mBluetoothAdapter == null || !mBluetoothGattMap.containsKey(address)) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
if(mReadyToRead && mReady) {
boolean result = mBluetoothGattMap.get(address).readCharacteristic(characteristic);
mReadyToRead = false;
mReady = false;
if(!result) {
Log.i(TAG, "read failed");
}
}else {
mCharacteristicReadQueue.push(characteristic);
}
}
public void writeCharacteristic(String address, BluetoothGattCharacteristic characteristic) {
Log.i(TAG, "writeCharacteristic - readyToWrite = " + mReadyToWrite + " queue size = " + mCharacteristicWriteQueue.size());
if (mBluetoothAdapter == null || !mBluetoothGattMap.containsKey(address)) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
if(mReadyToWrite && mReady) {
boolean result = mBluetoothGattMap.get(address).writeCharacteristic(characteristic);
mReadyToWrite = false;
mReady = false;
if(!result) {
Log.i(TAG, "characteristic write failed");
}
}else {
mCharacteristicWriteQueue.push(characteristic);
}
}
public void readDescriptor(String address, BluetoothGattDescriptor descriptor) {
Log.i(TAG, "reading descriptor");
if (mBluetoothAdapter == null || !mBluetoothGattMap.containsKey(address)) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
if(mReadyToRead && mReady) {
boolean result = mBluetoothGattMap.get(address).readDescriptor(descriptor);
mReadyToRead = false;
mReady = false;
if(!result) {
Log.i(TAG, "descriptor read failed");
}
}else {
mDescriptorReadQueue.push(descriptor);
}
}
public void writeDescriptor(String address, BluetoothGattDescriptor descriptor) {
Log.i(TAG, "writing descriptor for characteristic " + descriptor.getCharacteristic().getUuid().toString());
if (mBluetoothAdapter == null || !mBluetoothGattMap.containsKey(address)) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
if(mReadyToWrite && mReady) {
boolean result = mBluetoothGattMap.get(address).writeDescriptor(descriptor);
mReadyToWrite = false;
mReady = false;
if(!result) {
Log.i(TAG, "descriptor write failed");
}
}else {
mDescriptorWriteQueue.push(descriptor);
}
}
public BluetoothGattCharacteristic getCharacteristic(String address, UUID uuid) {
if(!mBluetoothGattMap.containsKey(address)) {
Log.i(TAG, "Device address " + address + " not found");
return null;
}
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
for(BluetoothGattService service : mBluetoothGattMap.get(address).getServices()) {
Log.i(TAG, "Service: " + service.getUuid().toString());
for (BluetoothGattCharacteristic characteristic : service.getCharacteristics()) {
Log.i(TAG, "Characteristic: " + characteristic.getUuid().toString());
if(characteristic.getUuid().equals(uuid)) {
return characteristic;
}
}
}
Log.i(TAG, "Characteristic not found");
return null;
}
public Set<String> getConnectedDevices(){
return this.mBluetoothGattMap.keySet();
}
/**
* Enables or disables notification on a give characteristic.
*
* @param characteristic Characteristic to act on.
* @param enabled If true, enable notification. False otherwise.
*/
public void setCharacteristicNotification(String address, BluetoothGattCharacteristic characteristic, boolean enabled) {
if (mBluetoothAdapter == null || !mBluetoothGattMap.containsKey(address)) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(100);
}
}catch(InterruptedException e){
//ignore
}
mBluetoothGattMap.get(address).setCharacteristicNotification(characteristic, enabled);
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(GattAttributes.CLIENT_CHAR_CONFIG));
if(descriptor != null) {
boolean status = descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
Log.i(TAG, "descriptor " + descriptor.getUuid().toString() + " setValue() status: " + status);
Log.i(TAG, "descriptor value: " + descriptor.getValue());
writeDescriptor(address, descriptor);
}
}
public void setPhoneEvents(byte priorities) {
for(String address : mBluetoothGattMap.keySet()) {
BluetoothGattCharacteristic characteristic = getCharacteristic(address, UUID.fromString(GattAttributes.ALERT_ATTRIBUTE));
if (characteristic != null) {
byte prioritiesBuf[] = new byte[1];
prioritiesBuf[0] = priorities;
characteristic.setValue(prioritiesBuf);
writeCharacteristic(address, characteristic);
Log.i(TAG, String.format("Forwarded phone alert priorities: 0x%X", priorities));
} else {
Log.e(TAG, "Failed to get the Alert ID characteristic from Gatt Server for device address " + address);
}
}
}
/**
* Retrieves a list of supported GATT services on the connected device. This should be
* invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
*
* @return A {@code List} of supported services.
*/
public List<BluetoothGattService> getSupportedGattServices(String address) {
if (mBluetoothGattMap.get(address) == null) return null;
return mBluetoothGattMap.get(address).getServices();
}
你有沒有解決這個問題？我有類似的問題...我斷開'BluetoothGatt'，然後當呼叫表明斷開，我關閉'BluetoothGatt'，但它似乎連接實際上並沒有斷開/關閉。一旦關閉我的應用程序，連接關閉，外圍設備返回廣告，所以我知道外設的行爲是正確的。 – mtrewartha