Fix updates of the enable/disable button

Make the entire ApplicationsState resume and do way too much work
so that we can get a little bit of state.

ApplicationsState could use some refactoring.

Bug: 21518528
Change-Id: Ibb6a2c15948f9bc69490426d4004dc83582087b4

src/com/android/settings/applications/AppInfoBase.java

@@ -54,6 +54,7 @@ public abstract class AppInfoBase extends SettingsPreferenceFragment
     protected boolean mAppControlRestricted = false;
 
     protected ApplicationsState mState;
+    protected ApplicationsState.Session mSession;
     protected ApplicationsState.AppEntry mAppEntry;
     protected PackageInfo mPackageInfo;
     protected int mUserId;
@@ -75,6 +76,7 @@ public abstract class AppInfoBase extends SettingsPreferenceFragment
         mFinishing = false;
 
         mState = ApplicationsState.getInstance(getActivity().getApplication());
+        mSession = mState.newSession(this);
         Context context = getActivity();
         mDpm = (DevicePolicyManager) context.getSystemService(Context.DEVICE_POLICY_SERVICE);
         mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
@@ -88,6 +90,7 @@ public abstract class AppInfoBase extends SettingsPreferenceFragment
     @Override
     public void onResume() {
         super.onResume();
+        mSession.resume();
         mAppControlRestricted = mUserManager.hasUserRestriction(UserManager.DISALLOW_APPS_CONTROL);
 
         if (!refreshUi()) {
@@ -95,6 +98,12 @@ public abstract class AppInfoBase extends SettingsPreferenceFragment
         }
     }
 
+    @Override
+    public void onPause() {
+        mSession.pause();
+        super.onPause();
+    }
+
     protected String retrieveAppEntry() {
         final Bundle args = getArguments();
         mPackageName = (args != null) ? args.getString(ARG_PACKAGE_NAME) : null;