Migrate to DashboardFragment in ToggleFeaturePreferenceFragment

Root Cause: ToggleFeaturePrefreferenceFragment becomes heavy when more and more features come in.

Solution: Mirgrate to DashboardFragment, a plugin-style preference controllers, can help us separate the preference and its logic into its own controller.

* This is the first step for the whole migration. Change to extend DashboardFragment and fill up the missing override functions.
* Reorder fields and functions to the recommended general approach.

Bug: 171272809
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=com.android.settings.accessibility

Change-Id: I852091700a4b3b3c7bbdbc82f0b5dc47c087d61c

src/com/android/settings/accessibility/LaunchAccessibilityActivityPreferenceFragment.java

@@ -49,9 +49,11 @@ import java.util.List;
 
 /** Fragment for providing open activity button. */
 public class LaunchAccessibilityActivityPreferenceFragment extends ToggleFeaturePreferenceFragment {
-    private static final String TAG = "LaunchA11yActivity";
+
+    private static final String TAG = "LaunchAccessibilityActivityPreferenceFragment";
     private static final String EMPTY_STRING = "";
     protected static final String KEY_LAUNCH_PREFERENCE = "launch_preference";
+
     private ComponentName mTileComponentName;
 
     @Override
@@ -70,10 +72,10 @@ public class LaunchAccessibilityActivityPreferenceFragment extends ToggleFeature
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
-        final View view = super.onCreateView(inflater, container, savedInstanceState);
-
         // Init new preference to replace the switch preference instead.
         initLaunchPreference();
+
+        final View view = super.onCreateView(inflater, container, savedInstanceState);
         removePreference(KEY_USE_SERVICE_PREFERENCE);
         return view;
     }
@@ -173,6 +175,7 @@ public class LaunchAccessibilityActivityPreferenceFragment extends ToggleFeature
     /** Customizes the order by preference key. */
     protected List<String> getPreferenceOrderList() {
         final List<String> lists = new ArrayList<>();
+        lists.add(KEY_TOP_INTRO_PREFERENCE);
         lists.add(KEY_ANIMATED_IMAGE);
         lists.add(KEY_LAUNCH_PREFERENCE);
         lists.add(KEY_GENERAL_CATEGORY);
@@ -230,4 +233,15 @@ public class LaunchAccessibilityActivityPreferenceFragment extends ToggleFeature
 
         return settingsIntent;
     }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        // TODO(b/171272809): Add back when controllers move to static type
+        return 0;
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
 }