Add MOBILE_DATA_PREFERRED_APPS setting

This setting is OEM upstream requirement for mobile data
preferred apps feature.

Bug: 171872461
Test: atest FrameworksNetTests
Merged-In: Ic5e0515b2b948de3d333c8d8e073d0b15514562a
Change-Id: Iba17bf68cffbe39d1c08ad94364b41bbf851bf57
diff --git a/framework/src/android/net/ConnectivitySettingsManager.java b/framework/src/android/net/ConnectivitySettingsManager.java
index e133d5e..9a00055 100644
--- a/framework/src/android/net/ConnectivitySettingsManager.java
+++ b/framework/src/android/net/ConnectivitySettingsManager.java
@@ -333,6 +333,14 @@
             "network_metered_multipath_preference";
 
     /**
+     * A list of apps that should go on cellular networks in preference even when higher-priority
+     * networks are connected.
+     *
+     * @hide
+     */
+    public static final String MOBILE_DATA_PREFERRED_APPS = "mobile_data_preferred_apps";
+
+    /**
      * Get mobile data activity timeout from {@link Settings}.
      *
      * @param context The {@link Context} to query the setting.
@@ -893,4 +901,29 @@
         Settings.Global.putString(
                 context.getContentResolver(), NETWORK_METERED_MULTIPATH_PREFERENCE, preference);
     }
+
+    /**
+     * Get the list of apps(from {@link Settings}) that should go on cellular networks in preference
+     * even when higher-priority networks are connected.
+     *
+     * @param context The {@link Context} to query the setting.
+     * @return A list of apps that should go on cellular networks in preference even when
+     *         higher-priority networks are connected or null if no setting value.
+     */
+    @Nullable
+    public static String getMobileDataPreferredApps(@NonNull Context context) {
+        return Settings.Secure.getString(context.getContentResolver(), MOBILE_DATA_PREFERRED_APPS);
+    }
+
+    /**
+     * Set the list of apps(to {@link Settings}) that should go on cellular networks in preference
+     * even when higher-priority networks are connected.
+     *
+     * @param context The {@link Context} to set the setting.
+     * @param list A list of apps that should go on cellular networks in preference even when
+     *             higher-priority networks are connected.
+     */
+    public static void setMobileDataPreferredApps(@NonNull Context context, @Nullable String list) {
+        Settings.Secure.putString(context.getContentResolver(), MOBILE_DATA_PREFERRED_APPS, list);
+    }
 }