断开设备连接后未调用 OnConnectionStateChange

Question

我在通过参数禁用蓝牙时遇到问题。我使用 Broadcast Receiver 来监听这个动作，当它的状态关闭时，我调用一个方法来断开我的外围设备。在我的日志中我只看到 D/BluetoothGatt: cancelOpen() 但根据 BluetoothGatt.class 服务调用我们的 BluetoothGattCallback in disconnect 方法 onConnectionStateChanged 转向 DEVICE_DISCONNECTED 和我20 或 30 秒后也没有任何内容（主管超时）。

当我想用我的内部方法直接断开我的设备时，它工作正常。

这是断开连接的方法：

   /**
     * Disconnects an established connection, or cancels a connection attempt
     * currently in progress.
     *
     * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     */
    public void disconnect() {
        if (DBG) Log.d(TAG, "cancelOpen() - device: " + mDevice.getAddress());
        if (mService == null || mClientIf == 0) return;

        try {
            mService.clientDisconnect(mClientIf, mDevice.getAddress());
        } catch (RemoteException e) {
            Log.e(TAG,"",e);
        }
    }

我用反射检查了 mClientIf 是否等于 0 或者 mService 是否为 Null 但他进入下一步并输入 try/catch。所以我不明白 Android 这里的行为

Answer 1

我根据这个库和这个 class 找到了解决方案： https://github.com/NordicSemiconductor/Android-BLE-Library/blob/master/ble/src/main/java/no/nordicsemi/android/ble/BleManager.java

private final BroadcastReceiver mBluetoothStateBroadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(final Context context, final Intent intent) {
        final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.STATE_OFF);
        final int previousState = intent.getIntExtra(BluetoothAdapter.EXTRA_PREVIOUS_STATE, BluetoothAdapter.STATE_OFF);

        switch (state) {
            case BluetoothAdapter.STATE_TURNING_OFF:
            case BluetoothAdapter.STATE_OFF:
                if (mConnected && previousState != BluetoothAdapter.STATE_TURNING_OFF && previousState != BluetoothAdapter.STATE_OFF) {
                    // The connection is killed by the system, no need to gently disconnect
                    mGattCallback.notifyDeviceDisconnected(mBluetoothDevice);
                }
                // Calling close() will prevent the STATE_OFF event from being logged (this receiver will be unregistered). But it doesn't matter.
                close();
                break;
        }
    }
};

我根据自己的需要对其进行了调整，但我也使用断开连接的设备信息发送了我的事件，并调用了我自己的关闭方法来释放资源并准备另一个连接。

断开设备连接后未调用 OnConnectionStateChange

OnConnectionStateChange not called after disconnecting device

android

bluetooth

gatt