Check if network has partial connectivity

In some networks, network validation may only get success
result for http probe but fail result for https probe.
For this kind of network, it may still work at some websites
or apps, but user didn't know about that. In order to fix this
issue, we will check if network has partial connectivity and
notify user to make a choice if they want to use this partial
connectivity or not.

Bug: 113450764
Test: 1. Build pass.
      2. Fake partial connectivity case for testing.
      3. atest FrameworksNetTests
      4. atest NetworkStackTests

Change-Id: I69ed00ac4850904ff708c9fef22e148879a10e92
diff --git a/api/system-current.txt b/api/system-current.txt
index 1d6b595..b89a1da 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -3193,6 +3193,7 @@
     method public int[] getTransportTypes();
     method public boolean satisfiedByNetworkCapabilities(android.net.NetworkCapabilities);
     field public static final int NET_CAPABILITY_OEM_PAID = 22; // 0x16
+    field public static final int NET_CAPABILITY_PARTIAL_CONNECTIVITY = 24; // 0x18
   }
 
   public class NetworkKey implements android.os.Parcelable {
@@ -3341,10 +3342,12 @@
     ctor public CaptivePortalProbeResult(int, String, String);
     ctor public CaptivePortalProbeResult(int, String, String, android.net.captiveportal.CaptivePortalProbeSpec);
     method public boolean isFailed();
+    method public boolean isPartialConnectivity();
     method public boolean isPortal();
     method public boolean isSuccessful();
     field public static final android.net.captiveportal.CaptivePortalProbeResult FAILED;
     field public static final int FAILED_CODE = 599; // 0x257
+    field public static final android.net.captiveportal.CaptivePortalProbeResult PARTIAL;
     field public static final int PORTAL_CODE = 302; // 0x12e
     field public static final android.net.captiveportal.CaptivePortalProbeResult SUCCESS;
     field public static final int SUCCESS_CODE = 204; // 0xcc
@@ -3476,6 +3479,7 @@
     field public static final int NETWORK_FIRST_VALIDATION_PORTAL_FOUND = 10; // 0xa
     field public static final int NETWORK_FIRST_VALIDATION_SUCCESS = 8; // 0x8
     field public static final int NETWORK_LINGER = 5; // 0x5
+    field public static final int NETWORK_PARTIAL_CONNECTIVITY = 13; // 0xd
     field public static final int NETWORK_REVALIDATION_PORTAL_FOUND = 11; // 0xb
     field public static final int NETWORK_REVALIDATION_SUCCESS = 9; // 0x9
     field public static final int NETWORK_UNLINGER = 6; // 0x6
diff --git a/api/test-current.txt b/api/test-current.txt
index 0550663..d43b1c4 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -751,10 +751,12 @@
     ctor public CaptivePortalProbeResult(int, String, String);
     ctor public CaptivePortalProbeResult(int, String, String, android.net.captiveportal.CaptivePortalProbeSpec);
     method public boolean isFailed();
+    method public boolean isPartialConnectivity();
     method public boolean isPortal();
     method public boolean isSuccessful();
     field public static final android.net.captiveportal.CaptivePortalProbeResult FAILED;
     field public static final int FAILED_CODE = 599; // 0x257
+    field public static final android.net.captiveportal.CaptivePortalProbeResult PARTIAL;
     field public static final int PORTAL_CODE = 302; // 0x12e
     field public static final android.net.captiveportal.CaptivePortalProbeResult SUCCESS;
     field public static final int SUCCESS_CODE = 204; // 0xcc
@@ -886,6 +888,7 @@
     field public static final int NETWORK_FIRST_VALIDATION_PORTAL_FOUND = 10; // 0xa
     field public static final int NETWORK_FIRST_VALIDATION_SUCCESS = 8; // 0x8
     field public static final int NETWORK_LINGER = 5; // 0x5
+    field public static final int NETWORK_PARTIAL_CONNECTIVITY = 13; // 0xd
     field public static final int NETWORK_REVALIDATION_PORTAL_FOUND = 11; // 0xb
     field public static final int NETWORK_REVALIDATION_SUCCESS = 9; // 0x9
     field public static final int NETWORK_UNLINGER = 6; // 0x6
diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 249357e..91fefa2 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -427,6 +427,16 @@
             "android.net.conn.PROMPT_LOST_VALIDATION";
 
     /**
+     * Action used to display a dialog that asks the user whether to stay connected to a network
+     * that has not validated. This intent is used to start the dialog in settings via
+     * startActivity.
+     *
+     * @hide
+     */
+    public static final String ACTION_PROMPT_PARTIAL_CONNECTIVITY =
+            "android.net.conn.PROMPT_PARTIAL_CONNECTIVITY";
+
+    /**
      * Invalid tethering type.
      * @see #startTethering(int, boolean, OnStartTetheringCallback)
      * @hide
@@ -4018,7 +4028,7 @@
      *
      * @hide
      */
-    @RequiresPermission(android.Manifest.permission.CONNECTIVITY_INTERNAL)
+    @RequiresPermission(android.Manifest.permission.NETWORK_SETTINGS)
     public void setAcceptUnvalidated(Network network, boolean accept, boolean always) {
         try {
             mService.setAcceptUnvalidated(network, accept, always);
@@ -4028,6 +4038,29 @@
     }
 
     /**
+     * Informs the system whether it should consider the network as validated even if it only has
+     * partial connectivity. If {@code accept} is true, then the network will be considered as
+     * validated even if connectivity is only partial. If {@code always} is true, then the choice
+     * is remembered, so that the next time the user connects to this network, the system will
+     * switch to it.
+     *
+     * @param network The network to accept.
+     * @param accept Whether to consider the network as validated even if it has partial
+     *               connectivity.
+     * @param always Whether to remember this choice in the future.
+     *
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.NETWORK_STACK)
+    public void setAcceptPartialConnectivity(Network network, boolean accept, boolean always) {
+        try {
+            mService.setAcceptPartialConnectivity(network, accept, always);
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
+
+    /**
      * Informs the system to penalize {@code network}'s score when it becomes unvalidated. This is
      * only meaningful if the system is configured not to penalize such networks, e.g., if the
      * {@code config_networkAvoidBadWifi} configuration variable is set to 0 and the {@code
@@ -4037,7 +4070,7 @@
      *
      * @hide
      */
-    @RequiresPermission(android.Manifest.permission.CONNECTIVITY_INTERNAL)
+    @RequiresPermission(android.Manifest.permission.NETWORK_SETTINGS)
     public void setAvoidUnvalidated(Network network) {
         try {
             mService.setAvoidUnvalidated(network);
diff --git a/core/java/android/net/IConnectivityManager.aidl b/core/java/android/net/IConnectivityManager.aidl
index 9fc56b4..2df4e75 100644
--- a/core/java/android/net/IConnectivityManager.aidl
+++ b/core/java/android/net/IConnectivityManager.aidl
@@ -176,6 +176,7 @@
     void releaseNetworkRequest(in NetworkRequest networkRequest);
 
     void setAcceptUnvalidated(in Network network, boolean accept, boolean always);
+    void setAcceptPartialConnectivity(in Network network, boolean accept, boolean always);
     void setAvoidUnvalidated(in Network network);
     void startCaptivePortalApp(in Network network);
     void startCaptivePortalAppInternal(in Network network, in Bundle appExtras);
diff --git a/core/java/android/net/INetworkMonitor.aidl b/core/java/android/net/INetworkMonitor.aidl
index c94cdde..5d1ab98 100644
--- a/core/java/android/net/INetworkMonitor.aidl
+++ b/core/java/android/net/INetworkMonitor.aidl
@@ -32,9 +32,16 @@
     // 3. a broken network (e.g. DNS failed, connect failed, HTTP request failed).
     const int NETWORK_TEST_RESULT_INVALID = 1;
 
+    // After a network has been tested, this result can be sent with EVENT_NETWORK_TESTED.
+    // The network may be used as a default internet connection, but it was found to be a partial
+    // connectivity network which can get the pass result for http probe but get the failed result
+    // for https probe.
+    const int NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY = 2;
+
     void start();
     void launchCaptivePortalApp();
     void notifyCaptivePortalAppFinished(int response);
+    void notifyAcceptPartialConnectivity();
     void forceReevaluation(int uid);
     void notifyPrivateDnsChanged(in PrivateDnsConfigParcel config);
     void notifyDnsResponse(int returnCode);
diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index 0a63e75..e1cfe99 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -143,7 +143,8 @@
             NET_CAPABILITY_NOT_CONGESTED,
             NET_CAPABILITY_NOT_SUSPENDED,
             NET_CAPABILITY_OEM_PAID,
-            NET_CAPABILITY_MCX
+            NET_CAPABILITY_MCX,
+            NET_CAPABILITY_PARTIAL_CONNECTIVITY,
     })
     public @interface NetCapability { }
 
@@ -304,8 +305,15 @@
      */
     public static final int NET_CAPABILITY_MCX = 23;
 
+    /**
+     * Indicates that this network was tested to only provide partial connectivity.
+     * @hide
+     */
+    @SystemApi
+    public static final int NET_CAPABILITY_PARTIAL_CONNECTIVITY = 24;
+
     private static final int MIN_NET_CAPABILITY = NET_CAPABILITY_MMS;
-    private static final int MAX_NET_CAPABILITY = NET_CAPABILITY_MCX;
+    private static final int MAX_NET_CAPABILITY = NET_CAPABILITY_PARTIAL_CONNECTIVITY;
 
     /**
      * Network capabilities that are expected to be mutable, i.e., can change while a particular
@@ -320,7 +328,8 @@
             | (1 << NET_CAPABILITY_NOT_ROAMING)
             | (1 << NET_CAPABILITY_FOREGROUND)
             | (1 << NET_CAPABILITY_NOT_CONGESTED)
-            | (1 << NET_CAPABILITY_NOT_SUSPENDED);
+            | (1 << NET_CAPABILITY_NOT_SUSPENDED)
+            | (1 << NET_CAPABILITY_PARTIAL_CONNECTIVITY);
 
     /**
      * Network capabilities that are not allowed in NetworkRequests. This exists because the
@@ -375,6 +384,15 @@
             (1 << NET_CAPABILITY_WIFI_P2P);
 
     /**
+     * Capabilities that are managed by ConnectivityService.
+     */
+    private static final long CONNECTIVITY_MANAGED_CAPABILITIES =
+            (1 << NET_CAPABILITY_VALIDATED)
+            | (1 << NET_CAPABILITY_CAPTIVE_PORTAL)
+            | (1 << NET_CAPABILITY_FOREGROUND)
+            | (1 << NET_CAPABILITY_PARTIAL_CONNECTIVITY);
+
+    /**
      * Adds the given capability to this {@code NetworkCapability} instance.
      * Multiple capabilities may be applied sequentially.  Note that when searching
      * for a network to satisfy a request, all capabilities requested must be satisfied.
@@ -507,6 +525,14 @@
                 && ((mUnwantedNetworkCapabilities & (1 << capability)) != 0);
     }
 
+    /**
+     * Check if this NetworkCapabilities has system managed capabilities or not.
+     * @hide
+     */
+    public boolean hasConnectivityManagedCapability() {
+        return ((mNetworkCapabilities & CONNECTIVITY_MANAGED_CAPABILITIES) != 0);
+    }
+
     /** Note this method may result in having the same capability in wanted and unwanted lists. */
     private void combineNetCapabilities(NetworkCapabilities nc) {
         this.mNetworkCapabilities |= nc.mNetworkCapabilities;
@@ -1599,31 +1625,32 @@
      */
     public static String capabilityNameOf(@NetCapability int capability) {
         switch (capability) {
-            case NET_CAPABILITY_MMS:            return "MMS";
-            case NET_CAPABILITY_SUPL:           return "SUPL";
-            case NET_CAPABILITY_DUN:            return "DUN";
-            case NET_CAPABILITY_FOTA:           return "FOTA";
-            case NET_CAPABILITY_IMS:            return "IMS";
-            case NET_CAPABILITY_CBS:            return "CBS";
-            case NET_CAPABILITY_WIFI_P2P:       return "WIFI_P2P";
-            case NET_CAPABILITY_IA:             return "IA";
-            case NET_CAPABILITY_RCS:            return "RCS";
-            case NET_CAPABILITY_XCAP:           return "XCAP";
-            case NET_CAPABILITY_EIMS:           return "EIMS";
-            case NET_CAPABILITY_NOT_METERED:    return "NOT_METERED";
-            case NET_CAPABILITY_INTERNET:       return "INTERNET";
-            case NET_CAPABILITY_NOT_RESTRICTED: return "NOT_RESTRICTED";
-            case NET_CAPABILITY_TRUSTED:        return "TRUSTED";
-            case NET_CAPABILITY_NOT_VPN:        return "NOT_VPN";
-            case NET_CAPABILITY_VALIDATED:      return "VALIDATED";
-            case NET_CAPABILITY_CAPTIVE_PORTAL: return "CAPTIVE_PORTAL";
-            case NET_CAPABILITY_NOT_ROAMING:    return "NOT_ROAMING";
-            case NET_CAPABILITY_FOREGROUND:     return "FOREGROUND";
-            case NET_CAPABILITY_NOT_CONGESTED:  return "NOT_CONGESTED";
-            case NET_CAPABILITY_NOT_SUSPENDED:  return "NOT_SUSPENDED";
-            case NET_CAPABILITY_OEM_PAID:       return "OEM_PAID";
-            case NET_CAPABILITY_MCX:            return "MCX";
-            default:                            return Integer.toString(capability);
+            case NET_CAPABILITY_MMS:                  return "MMS";
+            case NET_CAPABILITY_SUPL:                 return "SUPL";
+            case NET_CAPABILITY_DUN:                  return "DUN";
+            case NET_CAPABILITY_FOTA:                 return "FOTA";
+            case NET_CAPABILITY_IMS:                  return "IMS";
+            case NET_CAPABILITY_CBS:                  return "CBS";
+            case NET_CAPABILITY_WIFI_P2P:             return "WIFI_P2P";
+            case NET_CAPABILITY_IA:                   return "IA";
+            case NET_CAPABILITY_RCS:                  return "RCS";
+            case NET_CAPABILITY_XCAP:                 return "XCAP";
+            case NET_CAPABILITY_EIMS:                 return "EIMS";
+            case NET_CAPABILITY_NOT_METERED:          return "NOT_METERED";
+            case NET_CAPABILITY_INTERNET:             return "INTERNET";
+            case NET_CAPABILITY_NOT_RESTRICTED:       return "NOT_RESTRICTED";
+            case NET_CAPABILITY_TRUSTED:              return "TRUSTED";
+            case NET_CAPABILITY_NOT_VPN:              return "NOT_VPN";
+            case NET_CAPABILITY_VALIDATED:            return "VALIDATED";
+            case NET_CAPABILITY_CAPTIVE_PORTAL:       return "CAPTIVE_PORTAL";
+            case NET_CAPABILITY_NOT_ROAMING:          return "NOT_ROAMING";
+            case NET_CAPABILITY_FOREGROUND:           return "FOREGROUND";
+            case NET_CAPABILITY_NOT_CONGESTED:        return "NOT_CONGESTED";
+            case NET_CAPABILITY_NOT_SUSPENDED:        return "NOT_SUSPENDED";
+            case NET_CAPABILITY_OEM_PAID:             return "OEM_PAID";
+            case NET_CAPABILITY_MCX:                  return "MCX";
+            case NET_CAPABILITY_PARTIAL_CONNECTIVITY: return "PARTIAL_CONNECTIVITY";
+            default:                                  return Integer.toString(capability);
         }
     }
 
diff --git a/core/java/android/net/NetworkMisc.java b/core/java/android/net/NetworkMisc.java
index c0487b5..6fb2390 100644
--- a/core/java/android/net/NetworkMisc.java
+++ b/core/java/android/net/NetworkMisc.java
@@ -52,6 +52,12 @@
     public boolean acceptUnvalidated;
 
     /**
+     * Whether the user explicitly set that this network should be validated even if presence of
+     * only partial internet connectivity.
+     */
+    public boolean acceptPartialConnectivity;
+
+    /**
      * Set to avoid surfacing the "Sign in to network" notification.
      * if carrier receivers/apps are registered to handle the carrier-specific provisioning
      * procedure, a carrier specific provisioning notification will be placed.
diff --git a/core/java/android/net/captiveportal/CaptivePortalProbeResult.java b/core/java/android/net/captiveportal/CaptivePortalProbeResult.java
index 7432687..3930344 100644
--- a/core/java/android/net/captiveportal/CaptivePortalProbeResult.java
+++ b/core/java/android/net/captiveportal/CaptivePortalProbeResult.java
@@ -30,10 +30,20 @@
     public static final int SUCCESS_CODE = 204;
     public static final int FAILED_CODE = 599;
     public static final int PORTAL_CODE = 302;
+    // Set partial connectivity http response code to -1 to prevent conflict with the other http
+    // response codes. Besides the default http response code of probe result is set as 599 in
+    // NetworkMonitor#sendParallelHttpProbes(), so response code will be set as -1 only when
+    // NetworkMonitor detects partial connectivity.
+    /**
+     * @hide
+     */
+    public static final int PARTIAL_CODE = -1;
 
     public static final CaptivePortalProbeResult FAILED = new CaptivePortalProbeResult(FAILED_CODE);
     public static final CaptivePortalProbeResult SUCCESS =
             new CaptivePortalProbeResult(SUCCESS_CODE);
+    public static final CaptivePortalProbeResult PARTIAL =
+            new CaptivePortalProbeResult(PARTIAL_CODE);
 
     private final int mHttpResponseCode;  // HTTP response code returned from Internet probe.
     public final String redirectUrl;      // Redirect destination returned from Internet probe.
@@ -69,4 +79,8 @@
     public boolean isFailed() {
         return !isSuccessful() && !isPortal();
     }
+
+    public boolean isPartialConnectivity() {
+        return mHttpResponseCode == PARTIAL_CODE;
+    }
 }
diff --git a/core/java/android/net/metrics/NetworkEvent.java b/core/java/android/net/metrics/NetworkEvent.java
index f5b2ff1..5128115 100644
--- a/core/java/android/net/metrics/NetworkEvent.java
+++ b/core/java/android/net/metrics/NetworkEvent.java
@@ -50,6 +50,8 @@
 
     public static final int NETWORK_CONSECUTIVE_DNS_TIMEOUT_FOUND = 12;
 
+    public static final int NETWORK_PARTIAL_CONNECTIVITY = 13;
+
     /** @hide */
     @IntDef(value = {
             NETWORK_CONNECTED,
@@ -64,6 +66,7 @@
             NETWORK_FIRST_VALIDATION_PORTAL_FOUND,
             NETWORK_REVALIDATION_PORTAL_FOUND,
             NETWORK_CONSECUTIVE_DNS_TIMEOUT_FOUND,
+            NETWORK_PARTIAL_CONNECTIVITY,
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface EventType {}
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index b412f0f..b4e69ad 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -3197,13 +3197,18 @@
     <string name="network_available_sign_in_detailed"><xliff:g id="network_ssid">%1$s</xliff:g></string>
 
     <!-- A notification is shown when the user connects to a Wi-Fi network and the system detects that that network has no Internet access. This is the notification's title. -->
-    <string name="wifi_no_internet">Wi-Fi has no internet access</string>
+    <string name="wifi_no_internet"><xliff:g id="network_ssid" example="GoogleGuest">%1$s</xliff:g> has no internet access</string>
 
     <!-- A notification is shown when the user connects to a Wi-Fi network and the system detects that that network has no Internet access. This is the notification's message. -->
     <string name="wifi_no_internet_detailed">Tap for options</string>
 
     <!-- A notification is shown after the user logs in to a captive portal network, to indicate that the network should now have internet connectivity. This is the message of notification. [CHAR LIMIT=50] -->
     <string name="captive_portal_logged_in_detailed">Connected</string>
+    <!-- A notification is shown when the user connects to a network that doesn't have access to some services (e.g. Push notifications may not work). This is the notification's title. [CHAR LIMIT=50] -->
+    <string name="network_partial_connectivity"><xliff:g id="network_ssid" example="GoogleGuest">%1$s</xliff:g> has limited connectivity</string>
+
+    <!-- A notification is shown when the user connects to a network that doesn't have access to some services (e.g. Push notifications may not work). This is the notification's message. [CHAR LIMIT=50] -->
+    <string name="network_partial_connectivity_detailed">Tap to connect anyway</string>
 
     <!-- A notification is shown when the user's softap config has been changed due to underlying
          hardware restrictions. This is the notifications's title.
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 4689caa..a95fa54 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -1211,6 +1211,8 @@
   <java-symbol type="string" name="mediasize_japanese_kahu" />
   <java-symbol type="string" name="mediasize_japanese_kaku2" />
   <java-symbol type="string" name="mediasize_japanese_you4" />
+  <java-symbol type="string" name="network_partial_connectivity" />
+  <java-symbol type="string" name="network_partial_connectivity_detailed" />
   <java-symbol type="string" name="reason_service_unavailable" />
   <java-symbol type="string" name="reason_unknown" />
   <java-symbol type="string" name="restr_pin_enter_admin_pin" />
diff --git a/packages/NetworkStack/src/com/android/server/NetworkStackService.java b/packages/NetworkStack/src/com/android/server/NetworkStackService.java
index 90db207..72955bb 100644
--- a/packages/NetworkStack/src/com/android/server/NetworkStackService.java
+++ b/packages/NetworkStack/src/com/android/server/NetworkStackService.java
@@ -253,6 +253,12 @@
         }
 
         @Override
+        public void notifyAcceptPartialConnectivity() {
+            checkNetworkStackCallingPermission();
+            mNm.notifyAcceptPartialConnectivity();
+        }
+
+        @Override
         public void forceReevaluation(int uid) {
             checkNetworkStackCallingPermission();
             mNm.forceReevaluation(uid);
diff --git a/packages/NetworkStack/src/com/android/server/connectivity/NetworkMonitor.java b/packages/NetworkStack/src/com/android/server/connectivity/NetworkMonitor.java
index c3447fd..fc56da7 100644
--- a/packages/NetworkStack/src/com/android/server/connectivity/NetworkMonitor.java
+++ b/packages/NetworkStack/src/com/android/server/connectivity/NetworkMonitor.java
@@ -24,6 +24,7 @@
 import static android.net.ConnectivityManager.TYPE_MOBILE;
 import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_INVALID;
+import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_METERED;
 import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR;
 import static android.net.NetworkCapabilities.TRANSPORT_WIFI;
@@ -227,6 +228,12 @@
      */
     public static final int EVENT_DNS_NOTIFICATION = 17;
 
+    /**
+     * ConnectivityService notifies NetworkMonitor that the user accepts partial connectivity and
+     * NetworkMonitor should ignore the https probe.
+     */
+    public static final int EVENT_ACCEPT_PARTIAL_CONNECTIVITY = 18;
+
     // Start mReevaluateDelayMs at this value and double.
     private static final int INITIAL_REEVALUATE_DELAY_MS = 1000;
     private static final int MAX_REEVALUATE_DELAY_MS = 10 * 60 * 1000;
@@ -379,6 +386,14 @@
     }
 
     /**
+     * ConnectivityService notifies NetworkMonitor that the user accepts partial connectivity and
+     * NetworkMonitor should ignore the https probe.
+     */
+    public void notifyAcceptPartialConnectivity() {
+        sendMessage(EVENT_ACCEPT_PARTIAL_CONNECTIVITY);
+    }
+
+    /**
      * Request the NetworkMonitor to reevaluate the network.
      */
     public void forceReevaluation(int responsibleUid) {
@@ -636,6 +651,10 @@
                 case EVENT_DNS_NOTIFICATION:
                     mDnsStallDetector.accumulateConsecutiveDnsTimeoutCount(message.arg1);
                     break;
+                case EVENT_ACCEPT_PARTIAL_CONNECTIVITY:
+                    mUseHttps = false;
+                    transitionTo(mEvaluatingPrivateDnsState);
+                    break;
                 default:
                     break;
             }
@@ -1058,6 +1077,11 @@
                         notifyNetworkTested(NETWORK_TEST_RESULT_INVALID, probeResult.redirectUrl);
                         mLastPortalProbeResult = probeResult;
                         transitionTo(mCaptivePortalState);
+                    } else if (probeResult.isPartialConnectivity()) {
+                        logNetworkEvent(NetworkEvent.NETWORK_PARTIAL_CONNECTIVITY);
+                        notifyNetworkTested(NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY,
+                                probeResult.redirectUrl);
+                        transitionTo(mWaitingForNextProbeState);
                     } else {
                         logNetworkEvent(NetworkEvent.NETWORK_VALIDATION_FAILED);
                         notifyNetworkTested(NETWORK_TEST_RESULT_INVALID, probeResult.redirectUrl);
@@ -1065,7 +1089,8 @@
                     }
                     return HANDLED;
                 case EVENT_DNS_NOTIFICATION:
-                    // Leave the event to DefaultState to record correct dns timestamp.
+                case EVENT_ACCEPT_PARTIAL_CONNECTIVITY:
+                    // Leave the event to DefaultState.
                     return NOT_HANDLED;
                 default:
                     // Wait for probe result and defer events to next state by default.
@@ -1504,10 +1529,11 @@
         // If we have new-style probe specs, use those. Otherwise, use the fallback URLs.
         final CaptivePortalProbeSpec probeSpec = nextFallbackSpec();
         final URL fallbackUrl = (probeSpec != null) ? probeSpec.getUrl() : nextFallbackUrl();
+        CaptivePortalProbeResult fallbackProbeResult = null;
         if (fallbackUrl != null) {
-            CaptivePortalProbeResult result = sendHttpProbe(fallbackUrl, PROBE_FALLBACK, probeSpec);
-            if (result.isPortal()) {
-                return result;
+            fallbackProbeResult = sendHttpProbe(fallbackUrl, PROBE_FALLBACK, probeSpec);
+            if (fallbackProbeResult.isPortal()) {
+                return fallbackProbeResult;
             }
         }
         // Otherwise wait until http and https probes completes and use their results.
@@ -1517,6 +1543,12 @@
                 return httpProbe.result();
             }
             httpsProbe.join();
+            final boolean isHttpSuccessful =
+                    (httpProbe.result().isSuccessful()
+                    || (fallbackProbeResult != null && fallbackProbeResult.isSuccessful()));
+            if (httpsProbe.result().isFailed() && isHttpSuccessful) {
+                return CaptivePortalProbeResult.PARTIAL;
+            }
             return httpsProbe.result();
         } catch (InterruptedException e) {
             validationLog("Error: http or https probe wait interrupted!");
diff --git a/packages/NetworkStack/tests/src/com/android/server/connectivity/NetworkMonitorTest.java b/packages/NetworkStack/tests/src/com/android/server/connectivity/NetworkMonitorTest.java
index 34ca6ac..d93aef2 100644
--- a/packages/NetworkStack/tests/src/com/android/server/connectivity/NetworkMonitorTest.java
+++ b/packages/NetworkStack/tests/src/com/android/server/connectivity/NetworkMonitorTest.java
@@ -18,6 +18,7 @@
 
 import static android.net.CaptivePortal.APP_RETURN_DISMISSED;
 import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_INVALID;
+import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY;
 import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_VALID;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET;
 import static android.provider.Settings.Global.DATA_STALL_EVALUATION_TYPE_DNS;
@@ -572,6 +573,34 @@
                 stats.build());
     }
 
+    @Test
+    public void testIgnoreHttpsProbe() throws Exception {
+        setSslException(mHttpsConnection);
+        setStatus(mHttpConnection, 204);
+
+        final NetworkMonitor nm = makeMonitor();
+        nm.notifyNetworkConnected();
+        verify(mCallbacks, timeout(HANDLER_TIMEOUT_MS).times(1))
+                .notifyNetworkTested(NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY, null);
+
+        nm.notifyAcceptPartialConnectivity();
+        verify(mCallbacks, timeout(HANDLER_TIMEOUT_MS).times(1))
+                .notifyNetworkTested(NETWORK_TEST_RESULT_VALID, null);
+    }
+
+    @Test
+    public void testIsPartialConnectivity() throws IOException {
+        setStatus(mHttpsConnection, 500);
+        setStatus(mHttpConnection, 204);
+        setStatus(mFallbackConnection, 500);
+        assertPartialConnectivity(makeMonitor().isCaptivePortal());
+
+        setStatus(mHttpsConnection, 500);
+        setStatus(mHttpConnection, 500);
+        setStatus(mFallbackConnection, 204);
+        assertPartialConnectivity(makeMonitor().isCaptivePortal());
+    }
+
     private void makeDnsTimeoutEvent(WrappedNetworkMonitor wrappedMonitor, int count) {
         for (int i = 0; i < count; i++) {
             wrappedMonitor.getDnsStallDetector().accumulateConsecutiveDnsTimeoutCount(
@@ -649,6 +678,10 @@
         assertFalse(result.isSuccessful());
     }
 
+    private void assertPartialConnectivity(CaptivePortalProbeResult result) {
+        assertTrue(result.isPartialConnectivity());
+    }
+
     private void setSslException(HttpURLConnection connection) throws IOException {
         doThrow(new SSLHandshakeException("Invalid cert")).when(connection).getResponseCode();
     }
diff --git a/proto/src/system_messages.proto b/proto/src/system_messages.proto
index 8ee55e1..b94600b 100644
--- a/proto/src/system_messages.proto
+++ b/proto/src/system_messages.proto
@@ -233,6 +233,8 @@
     NOTE_NETWORK_SWITCH = 743;
     // Device logged-in captive portal network successfully
     NOTE_NETWORK_LOGGED_IN = 744;
+    // A partial connectivity network was detected during network validation
+    NOTE_NETWORK_PARTIAL_CONNECTIVITY = 745;
 
     // Notify the user that their work profile has been deleted
     // Package: android
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 39da90f..219cf33 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -25,6 +25,7 @@
 import static android.net.ConnectivityManager.TYPE_VPN;
 import static android.net.ConnectivityManager.getNetworkTypeName;
 import static android.net.ConnectivityManager.isNetworkTypeValid;
+import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY;
 import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_VALID;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_FOREGROUND;
@@ -34,6 +35,7 @@
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_ROAMING;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_SUSPENDED;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_VPN;
+import static android.net.NetworkCapabilities.NET_CAPABILITY_PARTIAL_CONNECTIVITY;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED;
 import static android.net.NetworkCapabilities.TRANSPORT_VPN;
 import static android.net.NetworkPolicyManager.RULE_NONE;
@@ -489,6 +491,15 @@
     public static final int EVENT_TIMEOUT_NOTIFICATION = 44;
 
     /**
+     * Used to specify whether a network should be used even if connectivity is partial.
+     * arg1 = whether to accept the network if its connectivity is partial (1 for true or 0 for
+     * false)
+     * arg2 = whether to remember this choice in the future (1 for true or 0 for false)
+     * obj  = network
+     */
+    private static final int EVENT_SET_ACCEPT_PARTIAL_CONNECTIVITY = 45;
+
+    /**
      * Argument for {@link #EVENT_PROVISIONING_NOTIFICATION} to indicate that the notification
      * should be shown.
      */
@@ -2487,9 +2498,7 @@
             switch (msg.what) {
                 case NetworkAgent.EVENT_NETWORK_CAPABILITIES_CHANGED: {
                     final NetworkCapabilities networkCapabilities = (NetworkCapabilities) msg.obj;
-                    if (networkCapabilities.hasCapability(NET_CAPABILITY_CAPTIVE_PORTAL) ||
-                            networkCapabilities.hasCapability(NET_CAPABILITY_VALIDATED) ||
-                            networkCapabilities.hasCapability(NET_CAPABILITY_FOREGROUND)) {
+                    if (networkCapabilities.hasConnectivityManagedCapability()) {
                         Slog.wtf(TAG, "BUG: " + nai + " has CS-managed capability.");
                     }
                     updateCapabilities(nai.getCurrentScore(), nai, networkCapabilities);
@@ -2514,6 +2523,14 @@
                     }
                     nai.networkMisc.explicitlySelected = true;
                     nai.networkMisc.acceptUnvalidated = msg.arg1 == 1;
+                    // Mark the network as temporarily accepting partial connectivity so that it
+                    // will be validated (and possibly become default) even if it only provides
+                    // partial internet access. Note that if user connects to partial connectivity
+                    // and choose "don't ask again", then wifi disconnected by some reasons(maybe
+                    // out of wifi coverage) and if the same wifi is available again, the device
+                    // will auto connect to this wifi even though the wifi has "no internet".
+                    // TODO: Evaluate using a separate setting in IpMemoryStore.
+                    nai.networkMisc.acceptPartialConnectivity = msg.arg1 == 1;
                     break;
                 }
                 case NetworkAgent.EVENT_SOCKET_KEEPALIVE: {
@@ -2531,6 +2548,23 @@
                     final NetworkAgentInfo nai = getNetworkAgentInfoForNetId(msg.arg2);
                     if (nai == null) break;
 
+                    final boolean partialConnectivity =
+                            (msg.arg1 == NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY)
+                                    // If user accepts partial connectivity network, NetworkMonitor
+                                    // will skip https probing. It will make partial connectivity
+                                    // network becomes valid. But user still need to know this
+                                    // network is limited. So, it's needed to refer to
+                                    // acceptPartialConnectivity to add
+                                    // NET_CAPABILITY_PARTIAL_CONNECTIVITY into NetworkCapabilities
+                                    // of this network. So that user can see "Limited connection"
+                                    // in the settings.
+                                    || (nai.networkMisc.acceptPartialConnectivity
+                                            && nai.partialConnectivity);
+                    // Once a network is determined to have partial connectivity, it cannot
+                    // go back to full connectivity without a disconnect.
+                    final boolean partialConnectivityChange =
+                            (partialConnectivity && !nai.partialConnectivity);
+
                     final boolean valid = (msg.arg1 == NETWORK_TEST_RESULT_VALID);
                     final boolean wasValidated = nai.lastValidated;
                     final boolean wasDefault = isDefaultNetwork(nai);
@@ -2539,6 +2573,17 @@
                         nai.captivePortalLoginNotified = true;
                         showNetworkNotification(nai, NotificationType.LOGGED_IN);
                     }
+                    // If this network has just connected and partial connectivity has just been
+                    // detected, tell NetworkMonitor if the user accepted partial connectivity on a
+                    // previous connect.
+                    if ((msg.arg1 == NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY)
+                            && nai.networkMisc.acceptPartialConnectivity) {
+                        try {
+                            nai.networkMonitor().notifyAcceptPartialConnectivity();
+                        } catch (RemoteException e) {
+                            e.rethrowFromSystemServer();
+                        }
+                    }
 
                     final String redirectUrl = (msg.obj instanceof String) ? (String) msg.obj : "";
 
@@ -2568,6 +2613,9 @@
                             mNotifier.clearNotification(nai.network.netId,
                                     NotificationType.LOST_INTERNET);
                         }
+                    } else if (partialConnectivityChange) {
+                        nai.partialConnectivity = partialConnectivity;
+                        updateCapabilities(nai.getCurrentScore(), nai, nai.networkCapabilities);
                     }
                     updateInetCondition(nai);
                     // Let the NetworkAgent know the state of its network
@@ -2606,7 +2654,7 @@
                     }
                     if (!visible) {
                         // Only clear SIGN_IN and NETWORK_SWITCH notifications here, or else other
-                        // notifications belong to the same network may be cleared unexpected.
+                        // notifications belong to the same network may be cleared unexpectedly.
                         mNotifier.clearNotification(netId, NotificationType.SIGN_IN);
                         mNotifier.clearNotification(netId, NotificationType.NETWORK_SWITCH);
                     } else {
@@ -3192,14 +3240,21 @@
 
     @Override
     public void setAcceptUnvalidated(Network network, boolean accept, boolean always) {
-        enforceConnectivityInternalPermission();
+        enforceNetworkStackSettingsOrSetup();
         mHandler.sendMessage(mHandler.obtainMessage(EVENT_SET_ACCEPT_UNVALIDATED,
                 encodeBool(accept), encodeBool(always), network));
     }
 
     @Override
+    public void setAcceptPartialConnectivity(Network network, boolean accept, boolean always) {
+        enforceNetworkStackSettingsOrSetup();
+        mHandler.sendMessage(mHandler.obtainMessage(EVENT_SET_ACCEPT_PARTIAL_CONNECTIVITY,
+                encodeBool(accept), encodeBool(always), network));
+    }
+
+    @Override
     public void setAvoidUnvalidated(Network network) {
-        enforceConnectivityInternalPermission();
+        enforceNetworkStackSettingsOrSetup();
         mHandler.sendMessage(mHandler.obtainMessage(EVENT_SET_AVOID_UNVALIDATED, network));
     }
 
@@ -3225,6 +3280,10 @@
         if (accept != nai.networkMisc.acceptUnvalidated) {
             int oldScore = nai.getCurrentScore();
             nai.networkMisc.acceptUnvalidated = accept;
+            // If network becomes partial connectivity and user already accepted to use this
+            // network, we should respect the user's option and don't need to popup the
+            // PARTIAL_CONNECTIVITY notification to user again.
+            nai.networkMisc.acceptPartialConnectivity = accept;
             rematchAllNetworksAndRequests(nai, oldScore);
             sendUpdatedScoreToFactories(nai);
         }
@@ -3243,6 +3302,48 @@
 
     }
 
+    private void handleSetAcceptPartialConnectivity(Network network, boolean accept,
+            boolean always) {
+        if (DBG) {
+            log("handleSetAcceptPartialConnectivity network=" + network + " accept=" + accept
+                    + " always=" + always);
+        }
+
+        final NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network);
+        if (nai == null) {
+            // Nothing to do.
+            return;
+        }
+
+        if (nai.lastValidated) {
+            // The network validated while the dialog box was up. Take no action.
+            return;
+        }
+
+        if (accept != nai.networkMisc.acceptPartialConnectivity) {
+            nai.networkMisc.acceptPartialConnectivity = accept;
+        }
+
+        // TODO: Use the current design or save the user choice into IpMemoryStore.
+        if (always) {
+            nai.asyncChannel.sendMessage(
+                    NetworkAgent.CMD_SAVE_ACCEPT_UNVALIDATED, encodeBool(accept));
+        }
+
+        if (!accept) {
+            // Tell the NetworkAgent to not automatically reconnect to the network.
+            nai.asyncChannel.sendMessage(NetworkAgent.CMD_PREVENT_AUTOMATIC_RECONNECT);
+            // Tear down the network.
+            teardownUnneededNetwork(nai);
+        } else {
+            try {
+                nai.networkMonitor().notifyAcceptPartialConnectivity();
+            } catch (RemoteException e) {
+                e.rethrowFromSystemServer();
+            }
+        }
+    }
+
     private void handleSetAvoidUnvalidated(Network network) {
         NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network);
         if (nai == null || nai.lastValidated) {
@@ -3413,6 +3514,9 @@
             case LOST_INTERNET:
                 action = ConnectivityManager.ACTION_PROMPT_LOST_VALIDATION;
                 break;
+            case PARTIAL_CONNECTIVITY:
+                action = ConnectivityManager.ACTION_PROMPT_PARTIAL_CONNECTIVITY;
+                break;
             default:
                 Slog.wtf(TAG, "Unknown notification type " + type);
                 return;
@@ -3435,22 +3539,36 @@
         if (VDBG || DDBG) log("handlePromptUnvalidated " + network);
         NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network);
 
-        // Only prompt if the network is unvalidated and was explicitly selected by the user, and if
-        // we haven't already been told to switch to it regardless of whether it validated or not.
-        // Also don't prompt on captive portals because we're already prompting the user to sign in.
-        if (nai == null || nai.everValidated || nai.everCaptivePortalDetected ||
-                !nai.networkMisc.explicitlySelected || nai.networkMisc.acceptUnvalidated) {
+        // Only prompt if the network is unvalidated or network has partial internet connectivity
+        // and was explicitly selected by the user, and if we haven't already been told to switch
+        // to it regardless of whether it validated or not. Also don't prompt on captive portals
+        // because we're already prompting the user to sign in.
+        if (nai == null || nai.everValidated || nai.everCaptivePortalDetected
+                || !nai.networkMisc.explicitlySelected || nai.networkMisc.acceptUnvalidated
+                || nai.networkMisc.acceptPartialConnectivity) {
             return;
         }
-        showNetworkNotification(nai, NotificationType.NO_INTERNET);
+        // TODO: Evaluate if it's needed to wait 8 seconds for triggering notification when
+        // NetworkMonitor detects the network is partial connectivity. Need to change the design to
+        // popup the notification immediately when the network is partial connectivity.
+        if (nai.partialConnectivity) {
+            // Treat PARTIAL_CONNECTIVITY as NO_INTERNET temporary until Settings has been updated.
+            // TODO: Need to change back to PARTIAL_CONNECTIVITY when Settings part is merged.
+            showNetworkNotification(nai, NotificationType.NO_INTERNET);
+        } else {
+            showNetworkNotification(nai, NotificationType.NO_INTERNET);
+        }
     }
 
     private void handleNetworkUnvalidated(NetworkAgentInfo nai) {
         NetworkCapabilities nc = nai.networkCapabilities;
         if (DBG) log("handleNetworkUnvalidated " + nai.name() + " cap=" + nc);
 
-        if (nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) &&
-            mMultinetworkPolicyTracker.shouldNotifyWifiUnvalidated()) {
+        if (!nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
+            return;
+        }
+
+        if (mMultinetworkPolicyTracker.shouldNotifyWifiUnvalidated()) {
             showNetworkNotification(nai, NotificationType.LOST_INTERNET);
         }
     }
@@ -3541,6 +3659,12 @@
                     handleSetAcceptUnvalidated(network, toBool(msg.arg1), toBool(msg.arg2));
                     break;
                 }
+                case EVENT_SET_ACCEPT_PARTIAL_CONNECTIVITY: {
+                    Network network = (Network) msg.obj;
+                    handleSetAcceptPartialConnectivity(network, toBool(msg.arg1),
+                            toBool(msg.arg2));
+                    break;
+                }
                 case EVENT_SET_AVOID_UNVALIDATED: {
                     handleSetAvoidUnvalidated((Network) msg.obj);
                     break;
@@ -5465,6 +5589,11 @@
         } else {
             newNc.addCapability(NET_CAPABILITY_NOT_SUSPENDED);
         }
+        if (nai.partialConnectivity) {
+            newNc.addCapability(NET_CAPABILITY_PARTIAL_CONNECTIVITY);
+        } else {
+            newNc.removeCapability(NET_CAPABILITY_PARTIAL_CONNECTIVITY);
+        }
 
         return newNc;
     }
diff --git a/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java b/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java
index f11a0de..65eb158 100644
--- a/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java
+++ b/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java
@@ -156,6 +156,9 @@
     // last detected.
     public boolean captivePortalLoginNotified;
 
+    // Set to true when partial connectivity was detected.
+    public boolean partialConnectivity;
+
     // Networks are lingered when they become unneeded as a result of their NetworkRequests being
     // satisfied by a higher-scoring network. so as to allow communication to wrap up before the
     // network is taken down.  This usually only happens to the default network. Lingering ends with
@@ -592,6 +595,8 @@
         for (LingerTimer timer : mLingerTimers) { pw.println(timer); }
     }
 
+    // TODO: Print shorter members first and only print the boolean variable which value is true
+    // to improve readability.
     public String toString() {
         return "NetworkAgentInfo{ ni{" + networkInfo + "}  "
                 + "network{" + network + "}  nethandle{" + network.getNetworkHandle() + "}  "
@@ -604,6 +609,8 @@
                 + "everCaptivePortalDetected{" + everCaptivePortalDetected + "} "
                 + "lastCaptivePortalDetected{" + lastCaptivePortalDetected + "} "
                 + "captivePortalLoginNotified{" + captivePortalLoginNotified + "} "
+                + "partialConnectivity{" + partialConnectivity + "} "
+                + "acceptPartialConnectivity{" + networkMisc.acceptPartialConnectivity + "} "
                 + "clat{" + clatd + "} "
                 + "}";
     }
diff --git a/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java b/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java
index b50477b..053da0d 100644
--- a/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java
+++ b/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java
@@ -47,8 +47,9 @@
         LOST_INTERNET(SystemMessage.NOTE_NETWORK_LOST_INTERNET),
         NETWORK_SWITCH(SystemMessage.NOTE_NETWORK_SWITCH),
         NO_INTERNET(SystemMessage.NOTE_NETWORK_NO_INTERNET),
-        SIGN_IN(SystemMessage.NOTE_NETWORK_SIGN_IN),
-        LOGGED_IN(SystemMessage.NOTE_NETWORK_LOGGED_IN);
+        LOGGED_IN(SystemMessage.NOTE_NETWORK_LOGGED_IN),
+        PARTIAL_CONNECTIVITY(SystemMessage.NOTE_NETWORK_PARTIAL_CONNECTIVITY),
+        SIGN_IN(SystemMessage.NOTE_NETWORK_SIGN_IN);
 
         public final int eventId;
 
@@ -169,11 +170,18 @@
         CharSequence details;
         int icon = getIcon(transportType);
         if (notifyType == NotificationType.NO_INTERNET && transportType == TRANSPORT_WIFI) {
-            title = r.getString(R.string.wifi_no_internet, 0);
+            title = r.getString(R.string.wifi_no_internet,
+                    WifiInfo.removeDoubleQuotes(nai.networkCapabilities.getSSID()));
             details = r.getString(R.string.wifi_no_internet_detailed);
+        } else if (notifyType == NotificationType.PARTIAL_CONNECTIVITY
+                && transportType == TRANSPORT_WIFI) {
+            title = r.getString(R.string.network_partial_connectivity,
+                    WifiInfo.removeDoubleQuotes(nai.networkCapabilities.getSSID()));
+            details = r.getString(R.string.network_partial_connectivity_detailed);
         } else if (notifyType == NotificationType.LOST_INTERNET &&
                 transportType == TRANSPORT_WIFI) {
-            title = r.getString(R.string.wifi_no_internet, 0);
+            title = r.getString(R.string.wifi_no_internet,
+                    WifiInfo.removeDoubleQuotes(nai.networkCapabilities.getSSID()));
             details = r.getString(R.string.wifi_no_internet_detailed);
         } else if (notifyType == NotificationType.SIGN_IN) {
             switch (transportType) {
@@ -316,6 +324,8 @@
         }
         switch (t) {
             case SIGN_IN:
+                return 5;
+            case PARTIAL_CONNECTIVITY:
                 return 4;
             case NO_INTERNET:
                 return 3;
diff --git a/tests/net/java/android/net/NetworkCapabilitiesTest.java b/tests/net/java/android/net/NetworkCapabilitiesTest.java
index 4d4915b..ad76388 100644
--- a/tests/net/java/android/net/NetworkCapabilitiesTest.java
+++ b/tests/net/java/android/net/NetworkCapabilitiesTest.java
@@ -20,6 +20,7 @@
 import static android.net.NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_CBS;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_EIMS;
+import static android.net.NetworkCapabilities.NET_CAPABILITY_FOREGROUND;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_MMS;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_METERED;
@@ -27,6 +28,7 @@
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_ROAMING;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_VPN;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_OEM_PAID;
+import static android.net.NetworkCapabilities.NET_CAPABILITY_PARTIAL_CONNECTIVITY;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_WIFI_P2P;
 import static android.net.NetworkCapabilities.RESTRICTED_CAPABILITIES;
@@ -335,6 +337,24 @@
     }
 
     @Test
+    public void testConnectivityManagedCapabilities() {
+        NetworkCapabilities nc = new NetworkCapabilities();
+        assertFalse(nc.hasConnectivityManagedCapability());
+        // Check every single system managed capability.
+        nc.addCapability(NET_CAPABILITY_CAPTIVE_PORTAL);
+        assertTrue(nc.hasConnectivityManagedCapability());
+        nc.removeCapability(NET_CAPABILITY_CAPTIVE_PORTAL);
+        nc.addCapability(NET_CAPABILITY_FOREGROUND);
+        assertTrue(nc.hasConnectivityManagedCapability());
+        nc.removeCapability(NET_CAPABILITY_FOREGROUND);
+        nc.addCapability(NET_CAPABILITY_PARTIAL_CONNECTIVITY);
+        assertTrue(nc.hasConnectivityManagedCapability());
+        nc.removeCapability(NET_CAPABILITY_PARTIAL_CONNECTIVITY);
+        nc.addCapability(NET_CAPABILITY_VALIDATED);
+        assertTrue(nc.hasConnectivityManagedCapability());
+    }
+
+    @Test
     public void testEqualsNetCapabilities() {
         NetworkCapabilities nc1 = new NetworkCapabilities();
         NetworkCapabilities nc2 = new NetworkCapabilities();
diff --git a/tests/net/java/com/android/server/ConnectivityServiceTest.java b/tests/net/java/com/android/server/ConnectivityServiceTest.java
index 9453a80..70eb70b 100644
--- a/tests/net/java/com/android/server/ConnectivityServiceTest.java
+++ b/tests/net/java/com/android/server/ConnectivityServiceTest.java
@@ -28,6 +28,7 @@
 import static android.net.ConnectivityManager.TYPE_NONE;
 import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_INVALID;
+import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY;
 import static android.net.INetworkMonitor.NETWORK_TEST_RESULT_VALID;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_CBS;
@@ -43,6 +44,7 @@
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_SUSPENDED;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_VPN;
+import static android.net.NetworkCapabilities.NET_CAPABILITY_PARTIAL_CONNECTIVITY;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_RCS;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_SUPL;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_TRUSTED;
@@ -442,6 +444,11 @@
             mNmValidationRedirectUrl = redirectUrl;
         }
 
+        void setNetworkPartial() {
+            mNmValidationResult = NETWORK_TEST_RESULT_PARTIAL_CONNECTIVITY;
+            mNmValidationRedirectUrl = null;
+        }
+
         MockNetworkAgent(int transport) {
             this(transport, new LinkProperties());
         }
@@ -484,6 +491,7 @@
             try {
                 doAnswer(validateAnswer).when(mNetworkMonitor).notifyNetworkConnected();
                 doAnswer(validateAnswer).when(mNetworkMonitor).forceReevaluation(anyInt());
+                doAnswer(validateAnswer).when(mNetworkMonitor).notifyAcceptPartialConnectivity();
             } catch (RemoteException e) {
                 fail(e.getMessage());
             }
@@ -669,6 +677,11 @@
             connect(false);
         }
 
+        public void connectWithPartialConnectivity() {
+            setNetworkPartial();
+            connect(false);
+        }
+
         public void suspend() {
             mNetworkInfo.setDetailedState(DetailedState.SUSPENDED, null, null);
             mNetworkAgent.sendNetworkInfo(mNetworkInfo);
@@ -2498,6 +2511,106 @@
     }
 
     @Test
+    public void testPartialConnectivity() {
+        // Register network callback.
+        NetworkRequest request = new NetworkRequest.Builder()
+                .clearCapabilities().addCapability(NET_CAPABILITY_INTERNET)
+                .build();
+        TestNetworkCallback callback = new TestNetworkCallback();
+        mCm.registerNetworkCallback(request, callback);
+
+        // Bring up validated mobile data.
+        mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
+        mCellNetworkAgent.connect(true);
+        callback.expectAvailableThenValidatedCallbacks(mCellNetworkAgent);
+
+        // Bring up wifi with partial connectivity.
+        mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
+        mWiFiNetworkAgent.connectWithPartialConnectivity();
+        callback.expectAvailableCallbacksUnvalidated(mWiFiNetworkAgent);
+        callback.expectCapabilitiesWith(NET_CAPABILITY_PARTIAL_CONNECTIVITY, mWiFiNetworkAgent);
+
+        // Mobile data should be the default network.
+        assertEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+        callback.assertNoCallback();
+
+        // If the user chooses yes to use this partial connectivity wifi, switch the default
+        // network to wifi and check if wifi becomes valid or not.
+        mCm.setAcceptPartialConnectivity(mWiFiNetworkAgent.getNetwork(), true /* accept */,
+                false /* always */);
+        // With https probe disabled, NetworkMonitor should pass the network validation with http
+        // probe.
+        mWiFiNetworkAgent.setNetworkValid();
+        waitForIdle();
+        try {
+            verify(mWiFiNetworkAgent.mNetworkMonitor,
+                    timeout(TIMEOUT_MS).times(1)).notifyAcceptPartialConnectivity();
+        } catch (RemoteException e) {
+            fail(e.getMessage());
+        }
+        callback.expectCallback(CallbackState.LOSING, mCellNetworkAgent);
+        NetworkCapabilities nc = callback.expectCapabilitiesWith(NET_CAPABILITY_VALIDATED,
+                mWiFiNetworkAgent);
+        assertTrue(nc.hasCapability(NET_CAPABILITY_PARTIAL_CONNECTIVITY));
+        assertEquals(mWiFiNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+
+        // Disconnect and reconnect wifi with partial connectivity again.
+        mWiFiNetworkAgent.disconnect();
+        callback.expectCallback(CallbackState.LOST, mWiFiNetworkAgent);
+        mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
+        mWiFiNetworkAgent.connectWithPartialConnectivity();
+        callback.expectAvailableCallbacksUnvalidated(mWiFiNetworkAgent);
+        callback.expectCapabilitiesWith(NET_CAPABILITY_PARTIAL_CONNECTIVITY, mWiFiNetworkAgent);
+
+        // Mobile data should be the default network.
+        assertEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+
+        // If the user chooses no, disconnect wifi immediately.
+        mCm.setAcceptPartialConnectivity(mWiFiNetworkAgent.getNetwork(), false/* accept */,
+                false /* always */);
+        callback.expectCallback(CallbackState.LOST, mWiFiNetworkAgent);
+
+        // If user accepted partial connectivity before, and device reconnects to that network
+        // again, but now the network has full connectivity. The network shouldn't contain
+        // NET_CAPABILITY_PARTIAL_CONNECTIVITY.
+        mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
+        // acceptUnvalidated is also used as setting for accepting partial networks.
+        mWiFiNetworkAgent.explicitlySelected(true /* acceptUnvalidated */);
+        mWiFiNetworkAgent.connect(true);
+        callback.expectAvailableCallbacksUnvalidated(mWiFiNetworkAgent);
+        callback.expectCallback(CallbackState.LOSING, mCellNetworkAgent);
+        nc = callback.expectCapabilitiesWith(NET_CAPABILITY_VALIDATED, mWiFiNetworkAgent);
+        assertFalse(nc.hasCapability(NET_CAPABILITY_PARTIAL_CONNECTIVITY));
+        // Wifi should be the default network.
+        assertEquals(mWiFiNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+        mWiFiNetworkAgent.disconnect();
+        callback.expectCallback(CallbackState.LOST, mWiFiNetworkAgent);
+
+        // If user accepted partial connectivity before, and now the device reconnects to the
+        // partial connectivity network. The network should be valid and contain
+        // NET_CAPABILITY_PARTIAL_CONNECTIVITY.
+        mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
+        mWiFiNetworkAgent.explicitlySelected(true /* acceptUnvalidated */);
+        mWiFiNetworkAgent.connectWithPartialConnectivity();
+        callback.expectAvailableCallbacksUnvalidated(mWiFiNetworkAgent);
+        // TODO: If the user accepted partial connectivity, we shouldn't switch to wifi until
+        // NetworkMonitor detects partial connectivity
+        assertEquals(mWiFiNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+        mWiFiNetworkAgent.setNetworkValid();
+        waitForIdle();
+        try {
+            verify(mWiFiNetworkAgent.mNetworkMonitor,
+                    timeout(TIMEOUT_MS).times(1)).notifyAcceptPartialConnectivity();
+        } catch (RemoteException e) {
+            fail(e.getMessage());
+        }
+        callback.expectCallback(CallbackState.LOSING, mCellNetworkAgent);
+        callback.expectCapabilitiesWith(NET_CAPABILITY_PARTIAL_CONNECTIVITY, mWiFiNetworkAgent);
+        // Wifi should be the default network.
+        assertEquals(mWiFiNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+    }
+
+    @Test
     public void testCaptivePortal() {
         final TestNetworkCallback captivePortalCallback = new TestNetworkCallback();
         final NetworkRequest captivePortalRequest = new NetworkRequest.Builder()