Allow setting of LayoutInflater.Factory in RemoteViews

This allows the inflating code to provide a LayoutInflater.Factory to
the RemoteViews instance and apply performance and memory optimizations
via View replacement. Approach is similar to how androidx libraries
apply AppCompat* views when apps inflate their views.

Bug: 287960719
Test: newly written unit tests
Change-Id: I2c21aee69158ba0a49178ff5384eb3848dbeb99a

core/java/android/widget/RemoteViews.java

@@ -413,6 +413,13 @@ public class RemoteViews implements Parcelable, Filter {
     /** Class cookies of the Parcel this instance was read from. */
     private Map<Class, Object> mClassCookies;
 
+    /**
+     * {@link LayoutInflater.Factory2} which will be passed into a {@link LayoutInflater} instance
+     * used by this class.
+     */
+    @Nullable
+    private LayoutInflater.Factory2 mLayoutInflaterFactory2;
+
     private static final InteractionHandler DEFAULT_INTERACTION_HANDLER =
             (view, pendingIntent, response) ->
                     startPendingIntent(view, pendingIntent, response.getLaunchOptions(view));
@@ -431,6 +438,29 @@ public class RemoteViews implements Parcelable, Filter {
         mActions.add(new SetRemoteInputsAction(viewId, remoteInputs));
     }
 
+    /**
+     * Sets {@link LayoutInflater.Factory2} to be passed into {@link LayoutInflater} used
+     * by this class instance. It has to be set before the views are inflated to have any effect.
+     *
+     * The factory callbacks will be called on the background thread so the implementation needs
+     * to be thread safe.
+     *
+     * @hide
+     */
+    public void setLayoutInflaterFactory(@Nullable LayoutInflater.Factory2 factory) {
+        mLayoutInflaterFactory2 = factory;
+    }
+
+    /**
+     * Returns currently set {@link LayoutInflater.Factory2}.
+     *
+     * @hide
+     */
+    @Nullable
+    public LayoutInflater.Factory2 getLayoutInflaterFactory() {
+        return mLayoutInflaterFactory2;
+    }
+
     /**
      * Reduces all images and ensures that they are all below the given sizes.
      *
@@ -5659,6 +5689,9 @@ public class RemoteViews implements Parcelable, Filter {
         // we don't add a filter to the static version returned by getSystemService.
         inflater = inflater.cloneInContext(inflationContext);
         inflater.setFilter(shouldUseStaticFilter() ? INFLATER_FILTER : this);
+        if (mLayoutInflaterFactory2 != null) {
+            inflater.setFactory2(mLayoutInflaterFactory2);
+        }
         View v = inflater.inflate(rv.getLayoutId(), parent, false);
         if (mViewId != View.NO_ID) {
             v.setId(mViewId);

core/tests/coretests/src/android/widget/RemoteViewsTest.java

@@ -22,6 +22,7 @@ import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.spy;
@@ -39,11 +40,15 @@ import android.os.AsyncTask;
 import android.os.Binder;
 import android.os.Looper;
 import android.os.Parcel;
+import android.util.AttributeSet;
 import android.util.SizeF;
 import android.view.ContextThemeWrapper;
+import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.test.InstrumentationRegistry;
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
@@ -827,4 +832,71 @@ public class RemoteViewsTest {
         verify(visitor, times(1)).accept(eq(icon3S.getUri()));
         verify(visitor, times(1)).accept(eq(icon4S.getUri()));
     }
+
+    @Test
+    public void layoutInflaterFactory_nothingSet_returnsNull() {
+        final RemoteViews rv = new RemoteViews(mPackage, R.layout.remote_views_test);
+        assertNull(rv.getLayoutInflaterFactory());
+    }
+
+    @Test
+    public void layoutInflaterFactory_replacesImageView_viewReplaced() {
+        final RemoteViews rv = new RemoteViews(mPackage, R.layout.remote_views_test);
+        final View replacement = new FrameLayout(mContext);
+        replacement.setId(1337);
+
+        LayoutInflater.Factory2 factory = createLayoutInflaterFactory("ImageView", replacement);
+        rv.setLayoutInflaterFactory(factory);
+
+        // Now inflate the views.
+        View inflated = rv.apply(mContext, mContainer);
+
+        assertEquals(factory, rv.getLayoutInflaterFactory());
+        View replacedFrameLayout = inflated.findViewById(1337);
+        assertNotNull(replacedFrameLayout);
+        assertEquals(replacement, replacedFrameLayout);
+        // ImageView should be fully replaced.
+        assertNull(inflated.findViewById(R.id.image));
+    }
+
+    @Test
+    public void layoutInflaterFactory_replacesImageView_settersStillFunctional() {
+        final RemoteViews rv = new RemoteViews(mPackage, R.layout.remote_views_test);
+        final TextView replacement = new TextView(mContext);
+        replacement.setId(R.id.text);
+        final String testText = "testText";
+        rv.setLayoutInflaterFactory(createLayoutInflaterFactory("TextView", replacement));
+        rv.setTextViewText(R.id.text, testText);
+
+
+        // Now inflate the views.
+        View inflated = rv.apply(mContext, mContainer);
+
+        TextView replacedTextView = inflated.findViewById(R.id.text);
+        assertSame(replacement, replacedTextView);
+        assertEquals(testText, replacedTextView.getText());
+    }
+
+    private static LayoutInflater.Factory2 createLayoutInflaterFactory(String viewTypeToReplace,
+            View replacementView) {
+        return new LayoutInflater.Factory2() {
+            @Nullable
+            @Override
+            public View onCreateView(@Nullable View parent, @NonNull String name,
+                                     @NonNull Context context, @NonNull AttributeSet attrs) {
+                if (viewTypeToReplace.equals(name)) {
+                    return replacementView;
+                }
+
+                return null;
+            }
+
+            @Nullable
+            @Override
+            public View onCreateView(@NonNull String name, @NonNull Context context,
+                                     @NonNull AttributeSet attrs) {
+                return null;
+            }
+        };
+    }
 }

services/tests/uiservicestests/src/com/android/server/notification/NotificationVisitUrisTest.java

@@ -34,6 +34,7 @@ import android.os.Bundle;
 import android.os.IBinder;
 import android.os.Parcel;
 import android.util.Log;
+import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.RemoteViews;
 
@@ -95,7 +96,8 @@ public class NotificationVisitUrisTest extends UiServiceTestCase {
     // Types that we can't really produce. No methods receiving these parameters will be invoked.
     private static final ImmutableSet<Class<?>> UNUSABLE_TYPES =
             ImmutableSet.of(Consumer.class, IBinder.class, MediaSession.Token.class, Parcel.class,
-                    PrintWriter.class, Resources.Theme.class, View.class);
+                    PrintWriter.class, Resources.Theme.class, View.class,
+                    LayoutInflater.Factory2.class);
 
     // Maximum number of times we allow generating the same class recursively.
     // E.g. new RemoteViews.addView(new RemoteViews()) but stop there.