Roaming and background controls under data usage.

Add action items to control mobile data roaming and background data
controls, along with dialogs to confirm.  Still need to fix telephony
to watch for Settings.Secure changes.

Hide "Change cycle" item when viewing app details.  Handle special
case where data usage doesn't want split action bar.

Bug: 4818009, 4979025, 4948767, 5010948
Change-Id: I363ff76a9daf2528d81573cf8d0687719d664bb0

src/com/android/settings/Settings.java

@@ -59,6 +59,8 @@ public class Settings extends PreferenceActivity implements ButtonBarHandler {
     private static final String META_DATA_KEY_PARENT_FRAGMENT_CLASS =
         "com.android.settings.PARENT_FRAGMENT_CLASS";
 
+    private static final String EXTRA_THEME = "settings:theme";
+
     private static final String SAVE_KEY_CURRENT_HEADER = "com.android.settings.CURRENT_HEADER";
     private static final String SAVE_KEY_PARENT_HEADER = "com.android.settings.PARENT_HEADER";
 
@@ -76,6 +78,10 @@ public class Settings extends PreferenceActivity implements ButtonBarHandler {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
+        final int theme = getIntent().getIntExtra(
+                EXTRA_THEME, android.R.style.Theme_Holo_SolidActionBar_SplitActionBarWhenNarrow);
+        setTheme(theme);
+
         getMetaData();
         mInLocalHeaderSwitch = true;
         super.onCreate(savedInstanceState);
@@ -277,6 +283,12 @@ public class Settings extends PreferenceActivity implements ButtonBarHandler {
             int titleRes, int shortTitleRes) {
         Intent intent = super.onBuildStartFragmentIntent(fragmentName, args,
                 titleRes, shortTitleRes);
+
+        // some fragments would like a custom activity theme
+        if (DataUsageSummary.class.getName().equals(fragmentName)) {
+            intent.putExtra(EXTRA_THEME, android.R.style.Theme_Holo_SolidActionBar);
+        }
+
         intent.setClass(this, SubSettings.class);
         return intent;
     }