Android BluetoothGatt 类中的 clientIf 字段

Android BluetoothGatt.class has mClientIf私人领域。大多数与 BLE 事件相关的日志消息都包含此值。例如：

onClientRegistered() - 状态=0 clientIf=17

什么是mClientIf场代表?什么是integer这个字段的值告诉？

mClientf is a scannerId从蓝牙扫描仪，

如果您深入研究BluetoothGatt和BluetoothLeScanner的源代码，您可以找到以下内容：

mBluetoothGatt.unregisterClient(scannerId);方法实现于

GattService.java unregisterClient(int clientIf)

蓝牙LeScanner.java

...
/**
 * Application interface registered - app is ready to go
 */
@Override
public void onScannerRegistered(int status, int scannerId) {
    Log.d(TAG, "onScannerRegistered() - status=" + status +
            " scannerId=" + scannerId + " mScannerId=" + mScannerId);
    synchronized (this) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            try {
                if (mScannerId == -1) {
                    // Registration succeeds after timeout, unregister client.
                    mBluetoothGatt.unregisterClient(scannerId);
                } else {
                    mScannerId = scannerId;
                    mBluetoothGatt.startScan(mScannerId, mSettings, mFilters,
                            mResultStorages,
                            ActivityThread.currentOpPackageName());
                }
            } catch (RemoteException e) {
                Log.e(TAG, "fail to start le scan: " + e);
                mScannerId = -1;
            }
        } else {
            // registration failed
            mScannerId = -1;
        }
        notifyAll();
    }
}
...

GattService.java

...
/**
 * Unregister the current application and callbacks.
 */
private IBluetoothGatt mService;
.
.   
public void unregisterClient(int clientIf) {
    GattService service = getService();
    if (service == null) return;
    service.unregisterClient(clientIf);
}
...