SystemUI: Provide correct resource type

- The value stored for when the network
class is unknown is 0. We attempt to get
the resource for this value, which doesn't exist,
resulting in a crash
- Store an empty string for when the
network class is unknown, which is also the
default value.

Change-Id: I1c10dfe18b7dd78e798c2b5a89ca2974136b7e84
CRs-Fixed: 953821

core/res/res/values/config.xml

@@ -2427,6 +2427,7 @@
     <bool name="config_display_rat">false</bool>
 
     <!-- config 2G/3G/4G RAT strings for carriers -->
+    <string name="config_rat_unknown" translatable="false">""</string>
     <string name="config_rat_2g" translatable="false">2G</string>
     <string name="config_rat_3g" translatable="false">3G</string>
     <string name="config_rat_4g" translatable="false">4G</string>

core/res/res/values/symbols.xml

@@ -2407,6 +2407,7 @@
   <java-symbol type="string" name="def_wifi_direct_name" />
   <java-symbol type="string" name="def_custom_bt_defname" />
   <!-- config 2G/3G/4G RAT strings for carriers -->
+  <java-symbol type="string" name="config_rat_unknown" />
   <java-symbol type="string" name="config_rat_2g" />
   <java-symbol type="string" name="config_rat_3g" />
   <java-symbol type="string" name="config_rat_4g" />

packages/Keyguard/src/com/android/keyguard/CarrierText.java

@@ -450,7 +450,8 @@ public CharSequence getTransformation(CharSequence source, View view) {
     }
 
     private String networkClassToString (int networkClass) {
-        final int[] classIds = { 0, // TelephonyManager.NETWORK_CLASS_UNKNOWN
+        final int[] classIds =
+            {com.android.internal.R.string.config_rat_unknown, // TelephonyManager.NETWORK_CLASS_UNKNOWN
             com.android.internal.R.string.config_rat_2g,
             com.android.internal.R.string.config_rat_3g,
             com.android.internal.R.string.config_rat_4g };

packages/SystemUI/src/com/android/systemui/statusbar/policy/MobileSignalController.java

@@ -388,7 +388,8 @@ private String getNetworkClassString(ServiceState state) {
     }
 
     private String networkClassToString (int networkClass) {
-        final int[] classIds = { 0, // TelephonyManager.NETWORK_CLASS_UNKNOWN
+        final int[] classIds =
+            {com.android.internal.R.string.config_rat_unknown, // TelephonyManager.NETWORK_CLASS_UNKNOWN
             com.android.internal.R.string.config_rat_2g,
             com.android.internal.R.string.config_rat_3g,
             com.android.internal.R.string.config_rat_4g };