Disable auto time zone on non-telephony devices

Disable auto time zone detection explicitly based on device
capabilities.

The TimeZoneDetector now enforces that the time zone cannot be set
manually when "auto_zone" is 1 (on). On devices without a telephony
network (the only devices that support auto time zone currently),
nothing explicitly sets the "auto_zone" value to 0 leading to problems
when the user tries to manually set the time zone. Therefore, to retain
the check, the code needs to ignore the auto_zone setting for devices
that inherently cannot support auto time zone detection.

Bug: 150583524
Bug: 150156441
Test: treehugger
Change-Id: Iea9c9e04c5617ccf0ba20511344884d3d88f2a9b

services/core/java/com/android/server/timezonedetector/TimeZoneDetectorCallbackImpl.java

@@ -20,6 +20,7 @@ import android.annotation.Nullable;
 import android.app.AlarmManager;
 import android.content.ContentResolver;
 import android.content.Context;
+import android.net.ConnectivityManager;
 import android.os.SystemProperties;
 import android.provider.Settings;
 
@@ -40,7 +41,20 @@ public final class TimeZoneDetectorCallbackImpl implements TimeZoneDetectorStrat
 
     @Override
     public boolean isAutoTimeZoneDetectionEnabled() {
-        return Settings.Global.getInt(mCr, Settings.Global.AUTO_TIME_ZONE, 1 /* default */) > 0;
+        if (isAutoTimeZoneDetectionSupported()) {
+            return Settings.Global.getInt(mCr, Settings.Global.AUTO_TIME_ZONE, 1 /* default */) > 0;
+        }
+        return false;
+    }
+
+    private boolean isAutoTimeZoneDetectionSupported() {
+        return deviceHasTelephonyNetwork();
+    }
+
+    private boolean deviceHasTelephonyNetwork() {
+        // TODO b/150583524 Avoid the use of a deprecated API.
+        return mContext.getSystemService(ConnectivityManager.class)
+                .isNetworkSupported(ConnectivityManager.TYPE_MOBILE);
     }
 
     @Override