Make conditional work properly when toggle it in QS

Some conditionals do not work properly when users toggle its state in
QS, the cause is that these conditionals don't have a way to monitor the
status changed. Make RecyclerView handle onWindowFocusChanged event and
make sure that conditionals can update the status when going back to
Settings from QS.

Bug: 118387886
Bug: 123171638
Bug: 123167705
Test: visual, robotests
Change-Id: Ib3bb9bf43afaa58726502eea1e98bcf602bc3677

res/layout/settings_homepage.xml

@@ -21,7 +21,7 @@
     android:layout_height="wrap_content"
     android:orientation="vertical">
 
-    <androidx.recyclerview.widget.RecyclerView
+    <com.android.settings.homepage.contextualcards.FocusRecyclerView
         android:id="@+id/card_container"
         android:layout_width="match_parent"
         android:layout_height="match_parent"

src/com/android/settings/homepage/contextualcards/ContextualCardManager.java

@@ -43,6 +43,8 @@ import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 import com.android.settingslib.core.lifecycle.Lifecycle;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
 import com.android.settingslib.core.lifecycle.events.OnSaveInstanceState;
+import com.android.settingslib.core.lifecycle.events.OnStart;
+import com.android.settingslib.core.lifecycle.events.OnStop;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -98,7 +100,6 @@ public class ContextualCardManager implements ContextualCardLoader.CardContentLo
         mLifecycleObservers = new ArrayList<>();
         mControllerRendererPool = new ControllerRendererPool();
         mLifecycle.addObserver(this);
-
         if (savedInstanceState == null) {
             mIsFirstLaunch = true;
             mSavedCards = null;
@@ -240,6 +241,21 @@ public class ContextualCardManager implements ContextualCardLoader.CardContentLo
         outState.putStringArrayList(KEY_CONTEXTUAL_CARDS, cards);
     }
 
+    public void onWindowFocusChanged(boolean hasWindowFocus) {
+        // Duplicate a list to avoid java.util.ConcurrentModificationException.
+        final List<ContextualCard> cards = new ArrayList<>(mContextualCards);
+        for (ContextualCard card : cards) {
+            final ContextualCardController controller = mControllerRendererPool
+                    .getController(mContext, card.getCardType());
+            if (hasWindowFocus && controller instanceof OnStart) {
+                ((OnStart) controller).onStart();
+            }
+            if (!hasWindowFocus && controller instanceof OnStop) {
+                ((OnStop) controller).onStop();
+            }
+        }
+    }
+
     public ControllerRendererPool getControllerRendererPool() {
         return mControllerRendererPool;
     }

src/com/android/settings/homepage/contextualcards/ContextualCardsFragment.java

@@ -27,17 +27,17 @@ import android.view.ViewGroup;
 
 import androidx.loader.app.LoaderManager;
 import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
 
 import com.android.settings.R;
 import com.android.settings.core.InstrumentedFragment;
 import com.android.settings.overlay.FeatureFactory;
 
-public class ContextualCardsFragment extends InstrumentedFragment {
+public class ContextualCardsFragment extends InstrumentedFragment implements
+        FocusRecyclerView.FocusListener {
 
     private static final String TAG = "ContextualCardsFragment";
 
-    private RecyclerView mCardsContainer;
+    private FocusRecyclerView mCardsContainer;
     private GridLayoutManager mLayoutManager;
     private ContextualCardsAdapter mContextualCardsAdapter;
     private ContextualCardManager mContextualCardManager;
@@ -72,10 +72,16 @@ public class ContextualCardsFragment extends InstrumentedFragment {
                 this /* lifecycleOwner */, mContextualCardManager);
         mCardsContainer.setAdapter(mContextualCardsAdapter);
         mContextualCardManager.setListener(mContextualCardsAdapter);
+        mCardsContainer.setListener(this);
 
         return rootView;
     }
 
+    @Override
+    public void onWindowFocusChanged(boolean hasWindowFocus) {
+        mContextualCardManager.onWindowFocusChanged(hasWindowFocus);
+    }
+
     @Override
     public int getMetricsCategory() {
         return SettingsEnums.SETTINGS_HOMEPAGE;

src/com/android/settings/homepage/contextualcards/FocusRecyclerView.java

@@ -0,0 +1,36 @@
+package com.android.settings.homepage.contextualcards;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.RecyclerView;
+
+public class FocusRecyclerView extends RecyclerView {
+
+    private FocusListener mListener;
+
+    public FocusRecyclerView(Context context) {
+        super(context);
+    }
+
+    public FocusRecyclerView(Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public void onWindowFocusChanged(boolean hasWindowFocus) {
+        super.onWindowFocusChanged(hasWindowFocus);
+        if (mListener != null) {
+            mListener.onWindowFocusChanged(hasWindowFocus);
+        }
+    }
+
+    public void setListener(FocusListener listener) {
+        mListener = listener;
+    }
+
+    public interface FocusListener {
+        void onWindowFocusChanged(boolean hasWindowFocus);
+    }
+}