设置网络接口优先级：数字越大，优先级越大
framework/opt/net/ethernet/java/com/android/server/ethernet/EthernetNetworkFactory.java
/**
* A map of TRANSPORT_* types to TransportInfo, making scoring and legacy type information
* available for each type an ethernet interface could propagate.
*
* Unfortunately, base scores for the various transports are not yet centrally located.
* They've been lifted from the corresponding NetworkFactory files in the meantime.
*
* Additionally, there are no legacy type equivalents to LOWPAN or WIFI_AWARE. These types
* are set to TYPE_NONE to match the behavior of their own network factories.
*/
private static final SparseArray<TransportInfo> sTransports = new SparseArray();
static {
// LowpanInterfaceTracker.NETWORK_SCORE
sTransports.put(NetworkCapabilities.TRANSPORT_LOWPAN,
new TransportInfo(ConnectivityManager.TYPE_NONE, 30));
// WifiAwareDataPathStateManager.NETWORK_FACTORY_SCORE_AVAIL
sTransports.put(NetworkCapabilities.TRANSPORT_WIFI_AWARE,
new TransportInfo(ConnectivityManager.TYPE_NONE, 1));
// EthernetNetworkFactory.NETWORK_SCORE
sTransports.put(NetworkCapabilities.TRANSPORT_ETHERNET,
new TransportInfo(ConnectivityManager.TYPE_ETHERNET, 70));
// BluetoothTetheringNetworkFactory.NETWORK_SCORE
sTransports.put(NetworkCapabilities.TRANSPORT_BLUETOOTH,
new TransportInfo(ConnectivityManager.TYPE_BLUETOOTH, 69));
// WifiNetworkFactory.SCORE_FILTER / NetworkAgent.WIFI_BASE_SCORE
sTransports.put(NetworkCapabilities.TRANSPORT_WIFI,
new TransportInfo(ConnectivityManager.TYPE_WIFI, 60));
// TelephonyNetworkFactory.TELEPHONY_NETWORK_SCORE
sTransports.put(NetworkCapabilities.TRANSPORT_CELLULAR,
new TransportInfo(ConnectivityManager.TYPE_MOBILE, 50));
}