Fix back key display issue in the split-screen

- Move the back key display module into the onResume.

Fixes: 280005953
Test: manual test
Change-Id: I289c5fab678fde8345a35d7909307f153a0d812f

src/com/android/settings/SettingsActivity.java

@@ -330,14 +330,6 @@ public class SettingsActivity extends SettingsBaseActivity
             launchSettingFragment(initialFragmentName, intent);
         }
 
-        final boolean isActionBarButtonEnabled = isActionBarButtonEnabled(intent);
-
-        final ActionBar actionBar = getActionBar();
-        if (actionBar != null) {
-            actionBar.setDisplayHomeAsUpEnabled(isActionBarButtonEnabled);
-            actionBar.setHomeButtonEnabled(isActionBarButtonEnabled);
-            actionBar.setDisplayShowTitleEnabled(true);
-        }
         mMainSwitch = findViewById(R.id.switch_bar);
         if (mMainSwitch != null) {
             mMainSwitch.setMetricsCategory(lookupMetricsCategory());
@@ -395,6 +387,17 @@ public class SettingsActivity extends SettingsBaseActivity
         }
     }
 
+    private void setActionBarStatus() {
+        final boolean isActionBarButtonEnabled = isActionBarButtonEnabled(getIntent());
+
+        final ActionBar actionBar = getActionBar();
+        if (actionBar != null) {
+            actionBar.setDisplayHomeAsUpEnabled(isActionBarButtonEnabled);
+            actionBar.setHomeButtonEnabled(isActionBarButtonEnabled);
+            actionBar.setDisplayShowTitleEnabled(true);
+        }
+    }
+
     private boolean isActionBarButtonEnabled(Intent intent) {
         if (WizardManagerHelper.isAnySetupWizard(intent)) {
             return false;
@@ -680,6 +683,7 @@ public class SettingsActivity extends SettingsBaseActivity
     @Override
     protected void onResume() {
         super.onResume();
+        setActionBarStatus();
 
         mDevelopmentSettingsListener = new BroadcastReceiver() {
             @Override