Android12 ethernet和wifi共存

1.修改网络优先走wifi 

packages/modules/Connectivityservice/src/com/android/server/connectivity/NetworkRanker.java   
 
@@ -44,7 +44,7 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 import java.util.function.Predicate;
-
+import android.util.Log;
 
@@ -85,7 +85,7 @@ public class NetworkRanker {
     }
 
     // Transport preference order, if it comes down to that.
-    private static final int[] PREFERREDTRANSPORTSORDER = { TRANSPORTETHERNET, TRANSPORTWIFI,
+    private static final int[] PREFERREDTRANSPORTSORDER = { TRANSPORTWIFI,TRANSPORTETHERNET,
             TRANSPORTBLUETOOTH, TRANSPORTCELLULAR };
 
     // Function used to partition a list into two working areas depending on whether they

2.修改NETWORK_SCORE（这一步好像没什么用）

--- a/java/com/android/server/ethernet/EthernetNetworkFactory.java
+++ b/java/com/android/server/ethernet/EthernetNetworkFactory.java
@@ -70,7 +70,9 @@ public class EthernetNetworkFactory extends NetworkFactory {
     private final static String TAG = EthernetNetworkFactory.class.getSimpleName();
     final static boolean DBG = true;
 
-    private final static int NETWORK_SCORE = 70;
+    private final static int NETWORK_SCORE = 30;
 
 
@@ -409,8 +412,10 @@ public class EthernetNetworkFactory extends NetworkFactory {
             sTransports.put(NetworkCapabilities.TRANSPORTWIFIAWARE,
                     new TransportInfo(ConnectivityManager.TYPE_NONE, 1));
             // EthernetNetworkFactory.NETWORK_SCORE
             sTransports.put(NetworkCapabilities.TRANSPORT_ETHERNET,
-                    new TransportInfo(ConnectivityManager.TYPE_ETHERNET, 70));
+                    new TransportInfo(ConnectivityManager.TYPE_ETHERNET, 30));
             // BluetoothTetheringNetworkFactory.NETWORK_SCORE
             sTransports.put(NetworkCapabilities.TRANSPORT_BLUETOOTH,
                     new TransportInfo(ConnectivityManager.TYPE_BLUETOOTH, 69));

3.修改阻止disable eth0 

--- a/common/moduleutils/src/android/net/ip/InterfaceController.java
+++ b/common/moduleutils/src/android/net/ip/InterfaceController.java
@@ -30,7 +30,7 @@ import android.system.OsConstants;
 import java.net.Inet4Address;
 import java.net.InetAddress;
 
-
+import android.util.Log;
 
     public boolean clearAllAddresses() {
         try {
+                       if(mIfName.equals("eth0"))
+                       {
+                               Log.e("clearAllAddresses","eth0 skip clear +++");
+                               return false;
+                       }
             mNetd.interfaceClearAddrs(mIfName);
         } catch (Exception e) {
             logError("Failed to clear addresses: %s", e);

 4.开机后在rc中自动添加一下路由表配置

路由表设置
ip ru add from all lookup main pref 9000