Implementation of "Enable 2G" for Settings.

(1) Adds KEY_HIDE_ENABLE_2G_BOOL to CarrierConfigManager, and
(2) Adds new reason ALLOWED_NETWORK_TYPES_REASON_ENABLE_2G.

Test: manual & atest -c Enable2gPreferenceControllerTest
Bug: b/163168917
Change-Id: I81052549f8dde491697c35365320145fd24c3842
Merged-In: I81052549f8dde491697c35365320145fd24c3842

2 files changed, 22 insertions, 1 deletions

diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 217570e1401c..464d37510034 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -4268,6 +4268,14 @@ public class CarrierConfigManager {
     public static final String KEY_STORE_SIM_PIN_FOR_UNATTENDED_REBOOT_BOOL =
             "store_sim_pin_for_unattended_reboot_bool";
 
+     /**
+     * Determine whether "Enable 2G" toggle can be shown.
+     *
+     * Used to trade privacy/security against potentially reduced carrier coverage for some
+     * carriers.
+     */
+    public static final String KEY_HIDE_ENABLE_2G = "hide_enable_2g_bool";
+
     /** The default value for every variable. */
     private final static PersistableBundle sDefaults;
 
@@ -4825,6 +4833,7 @@ public class CarrierConfigManager {
         sDefaults.putStringArray(KEY_ALLOWED_INITIAL_ATTACH_APN_TYPES_STRING_ARRAY,
                 new String[]{"ia", "default", "ims", "mms", "dun", "emergency"});
         sDefaults.putBoolean(KEY_STORE_SIM_PIN_FOR_UNATTENDED_REBOOT_BOOL, true);
+        sDefaults.putBoolean(KEY_HIDE_ENABLE_2G, false);
     }
 
     /**
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index e77ee365b4d3..e54877d70816 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -8224,7 +8224,8 @@ public class TelephonyManager {
     @IntDef({
             ALLOWED_NETWORK_TYPES_REASON_USER,
             ALLOWED_NETWORK_TYPES_REASON_POWER,
-            ALLOWED_NETWORK_TYPES_REASON_CARRIER
+            ALLOWED_NETWORK_TYPES_REASON_CARRIER,
+            ALLOWED_NETWORK_TYPES_REASON_ENABLE_2G
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface AllowedNetworkTypesReason {
@@ -8261,6 +8262,14 @@ public class TelephonyManager {
     public static final int ALLOWED_NETWORK_TYPES_REASON_CARRIER = 2;
 
     /**
+     * To indicate allowed network type change is requested by the user via the 2G toggle.
+     *
+     * @hide
+     */
+    @SystemApi
+    public static final int ALLOWED_NETWORK_TYPES_REASON_ENABLE_2G = 3;
+
+    /**
      * Set the allowed network types of the device and
      * provide the reason triggering the allowed network change.
      * This can be called for following reasons
@@ -8269,6 +8278,8 @@ public class TelephonyManager {
      * <li>Allowed network types control by power manager
      * {@link #ALLOWED_NETWORK_TYPES_REASON_POWER}
      * <li>Allowed network types control by carrier {@link #ALLOWED_NETWORK_TYPES_REASON_CARRIER}
+     * <li>Allowed network types control by the user-controlled "Allow 2G" toggle
+     * {@link #ALLOWED_NETWORK_TYPES_REASON_ENABLE_2G}
      * </ol>
      * This API will result in allowing an intersection of allowed network types for all reasons,
      * including the configuration done through other reasons.
@@ -8358,6 +8369,7 @@ public class TelephonyManager {
             case TelephonyManager.ALLOWED_NETWORK_TYPES_REASON_USER:
             case TelephonyManager.ALLOWED_NETWORK_TYPES_REASON_POWER:
             case TelephonyManager.ALLOWED_NETWORK_TYPES_REASON_CARRIER:
+            case TelephonyManager.ALLOWED_NETWORK_TYPES_REASON_ENABLE_2G:
                 return true;
         }
         return false;