Removing unnecessary system RPC for checking flags on every touch event

Change-Id: I8116bef952dbd49d1bad6c8844149538a6d0fa6b

src/com/android/launcher3/config/BaseFlags.java

@@ -21,6 +21,9 @@ import static androidx.core.util.Preconditions.checkNotNull;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.database.ContentObserver;
+import android.os.Handler;
+import android.os.Looper;
 import android.provider.Settings;
 
 import androidx.annotation.GuardedBy;
@@ -256,6 +259,16 @@ abstract class BaseFlags {
         @Override
         public void initialize(Context context) {
             contentResolver = context.getContentResolver();
+            contentResolver.registerContentObserver(Settings.Global.getUriFor(getKey()), true,
+                    new ContentObserver(new Handler(Looper.getMainLooper())) {
+                        @Override
+                        public void onChange(boolean selfChange) {
+                            superInitialize(context);
+                    }});
+            superInitialize(context);
+        }
+
+        private void superInitialize(Context context) {
             super.initialize(context);
         }
 
@@ -274,10 +287,5 @@ abstract class BaseFlags {
             }
             return Settings.Global.getInt(contentResolver, getKey(), defaultValue ? 1 : 0) == 1;
         }
-
-        @Override
-        public boolean get() {
-            return getFromStorage(null, getDefaultValue());
-        }
     }
 }