Settings: enable SIM card ringtone only if slot not empty [1/2]

same as in SIM card settings page

Change-Id: I3d0478080fdb838e0b730fdf7900dfa2f2e2ffe0
Signed-off-by: Hưng Phan <phandinhhungvp2001@gmail.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

src/com/android/settings/notification/PhoneRingtonePreferenceController.java

@@ -31,6 +31,7 @@ import com.android.settings.Utils;
 
 public class PhoneRingtonePreferenceController extends RingtonePreferenceControllerBase {
 
+    private static final int SLOT_ID = 0;
     private static final String KEY_PHONE_RINGTONE = "phone_ringtone";
 
     public PhoneRingtonePreferenceController(Context context) {
@@ -48,6 +49,7 @@ public class PhoneRingtonePreferenceController extends RingtonePreferenceControl
             DefaultRingtonePreference ringtonePreference =
                     (DefaultRingtonePreference) screen.findPreference(KEY_PHONE_RINGTONE);
             ringtonePreference.setTitle(mContext.getString(R.string.ringtone1_title));
+            ringtonePreference.setEnabled(hasCard());
         }
     }
 
@@ -73,4 +75,10 @@ public class PhoneRingtonePreferenceController extends RingtonePreferenceControl
         return Flags.enableRingtoneHapticsCustomization() && mContext.getResources().getBoolean(
                 com.android.internal.R.bool.config_ringtoneVibrationSettingsSupported);
     }
+
+    private boolean hasCard() {
+        TelephonyManager telephonyManager =
+                (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
+        return telephonyManager.hasIccCard(SLOT_ID);
+    }
 }