Respect user restrictions about adding/removing accounts, sideloading

Hide or disable options in the settings app when the user is restricted from
making changes.

Remove "Add account" button from Settings menu, and "remove account" option from menu in AccountSyncSettings.
Remove sideloading checkbox in SecuritySettings.

Also handle replacement of UserManager.isShareLocationToggleAllowed() with hasUserRestriction, which takes a restriction key string.

Change-Id: I34c74fd5aed8956ba00f92e3d3c657b608454dfe

src/com/android/settings/Settings.java

@@ -178,6 +178,7 @@ public class Settings extends PreferenceActivity
 
         if (mParentHeader != null) {
             setParentTitle(mParentHeader.title, null, new OnClickListener() {
+                @Override
                 public void onClick(View v) {
                     switchToParent(mParentHeader.fragment);
                 }
@@ -405,7 +406,6 @@ public class Settings extends PreferenceActivity
     @Override
     public void onBuildHeaders(List<Header> headers) {
         loadHeadersFromResource(R.xml.settings_headers, headers);
-
         updateHeaderList(headers);
     }
 
@@ -414,6 +414,8 @@ public class Settings extends PreferenceActivity
                 DevelopmentSettings.PREF_SHOW,
                 android.os.Build.TYPE.equals("eng"));
         int i = 0;
+
+        final UserManager um = (UserManager) getSystemService(Context.USER_SERVICE);
         mHeaderIndexMap.clear();
         while (i < target.size()) {
             Header header = target.get(i);
@@ -464,6 +466,10 @@ public class Settings extends PreferenceActivity
                         }
                     }
                 }
+            } else if (id == R.id.account_add) {
+                if (um.hasUserRestriction(UserManager.DISALLOW_MODIFY_ACCOUNTS)) {
+                    target.remove(i);
+                }
             }
 
             if (i < target.size() && target.get(i) == header
@@ -778,6 +784,7 @@ public class Settings extends PreferenceActivity
         return true;
     }
 
+    @Override
     public boolean shouldUpRecreateTask(Intent targetIntent) {
         return super.shouldUpRecreateTask(new Intent(this, Settings.class));
     }