Android rom开发：9.0系统上实现4G wifi 以太网共存

framework层修改网络优先级，4G > wifi > eth

修改patch如下：

diff --git a/frameworks/base/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java b/frameworks/base/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java
index 2e26769..14821f3 100644
--- a/frameworks/base/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java
+++ b/frameworks/base/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java
@@ -436,6 +436,15 @@ public class NetworkAgentInfo implements Comparable<NetworkAgentInfo> {
         }

         int score = currentScore;
+        if(networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)){
+            return 20;
+        }
+        if(networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET)){
+            return 10;
+        }
+        if(networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)){
+            return 30;
+        }
         if (!lastValidated && !pretendValidated && !ignoreWifiUnvalidationPenalty()) {
             score -= ConnectivityConstants.UNVALIDATED_SCORE_PENALTY;
         }
diff --git a/vendor/mediatek/proprietary/frameworks/opt/net/services/core/java/com/android/server/MtkConnectivityService.java b/vendor/mediatek/proprietary/frameworks/opt/net/services/core/java/com/android/s
index 7cd7e69..7cc2b4f 100644
--- a/vendor/mediatek/proprietary/frameworks/opt/net/services/core/java/com/android/server/MtkConnectivityService.java
+++ b/vendor/mediatek/proprietary/frameworks/opt/net/services/core/java/com/android/server/MtkConnectivityService.java
@@ -5271,7 +5271,7 @@ public class MtkConnectivityService extends ConnectivityService {
                 break;
             }
         }
-        nai.asyncChannel.disconnect();
+        //nai.asyncChannel.disconnect();
     }
     
	private void handleLingerComplete(NetworkAgentInfo oldNetwork) {