Fix Storage Settings progress bar summary jank problem

Only updates progress bar summary for a selected StorageEntry.
(Ignore updateState callback from DashboardFragment)

Bug: 187145219
Test: manual visual
Change-Id: I4a760ae6a0921c99348c0fce54251b2667bf29ae

src/com/android/settings/deviceinfo/storage/StorageUsageProgressBarPreferenceController.java

@@ -47,6 +47,7 @@ public class StorageUsageProgressBarPreferenceController extends BasePreferenceC
     long mTotalBytes;
     private UsageProgressBarPreference mUsageProgressBarPreference;
     private StorageEntry mStorageEntry;
+    boolean mIsUpdateStateFromSelectedStorageEntry;
 
     public StorageUsageProgressBarPreferenceController(Context context, String key) {
         super(context, key);
@@ -68,7 +69,6 @@ public class StorageUsageProgressBarPreferenceController extends BasePreferenceC
     @Override
     public void displayPreference(PreferenceScreen screen) {
         mUsageProgressBarPreference = screen.findPreference(getPreferenceKey());
-        getStorageStatsAndUpdateUi();
     }
 
     private void getStorageStatsAndUpdateUi() {
@@ -101,12 +101,18 @@ public class StorageUsageProgressBarPreferenceController extends BasePreferenceC
             if (mUsageProgressBarPreference == null) {
                 return;
             }
+            mIsUpdateStateFromSelectedStorageEntry = true;
             ThreadUtils.postOnMainThread(() -> updateState(mUsageProgressBarPreference));
         });
     }
 
     @Override
     public void updateState(Preference preference) {
+        if (!mIsUpdateStateFromSelectedStorageEntry) {
+            // Returns here to avoid jank by unnecessary UI update.
+            return;
+        }
+        mIsUpdateStateFromSelectedStorageEntry = false;
         mUsageProgressBarPreference.setUsageSummary(
                 getStorageSummary(R.string.storage_usage_summary, mUsedBytes));
         mUsageProgressBarPreference.setTotalSummary(