Fix the flashing list on Opening link page

The bottom list flashes because it takes some time to create a
DomainAppPreference, where each perference takes around 6ms to load an
icon. When there are, that say, 30 apps installed, then it will take
around 180ms to be ready, which introduces the flashing issue.

In order to tackle icon loading, this CL applies the icon cache
mechanism to speed up the loading time.

Fixes: 222981986
Test: robotest
Change-Id: Ia8f7cbf5af5ea9f694c352ea40ccca47bedb175c

src/com/android/settings/applications/managedomainurls/DomainAppPreference.java

@@ -19,27 +19,30 @@ package com.android.settings.applications.managedomainurls;
 import android.content.Context;
 import android.content.pm.verify.domain.DomainVerificationManager;
 import android.content.pm.verify.domain.DomainVerificationUserState;
-import android.util.IconDrawableFactory;
+import android.graphics.drawable.Drawable;
+
+import androidx.preference.PreferenceViewHolder;
 
 import com.android.settings.R;
 import com.android.settings.applications.intentpicker.IntentPickerUtils;
+import com.android.settingslib.applications.AppUtils;
 import com.android.settingslib.applications.ApplicationsState.AppEntry;
+import com.android.settingslib.utils.ThreadUtils;
 import com.android.settingslib.widget.AppPreference;
 
 public class DomainAppPreference extends AppPreference {
 
+    private Drawable mCacheIcon;
+
     private final AppEntry mEntry;
     private final DomainVerificationManager mDomainVerificationManager;
-    private final IconDrawableFactory mIconDrawableFactory;
 
-    public DomainAppPreference(final Context context, IconDrawableFactory iconFactory,
-            AppEntry entry) {
+    public DomainAppPreference(final Context context, AppEntry entry) {
         super(context);
-        mIconDrawableFactory = iconFactory;
         mDomainVerificationManager = context.getSystemService(DomainVerificationManager.class);
         mEntry = entry;
         mEntry.ensureLabel(getContext());
-
+        mCacheIcon = AppUtils.getIconFromCache(mEntry);
         setState();
     }
 
@@ -54,7 +57,12 @@ public class DomainAppPreference extends AppPreference {
 
     private void setState() {
         setTitle(mEntry.label);
-        setIcon(mIconDrawableFactory.getBadgedIcon(mEntry.info));
+
+        if (mCacheIcon != null) {
+            setIcon(mCacheIcon);
+        } else {
+            setIcon(R.drawable.empty_icon);
+        }
         setSummary(getDomainsSummary(mEntry.info.packageName));
     }
 
@@ -69,4 +77,18 @@ public class DomainAppPreference extends AppPreference {
                         packageName);
         return userState == null ? false : userState.isLinkHandlingAllowed();
     }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder view) {
+        if (mCacheIcon == null) {
+            ThreadUtils.postOnBackgroundThread(() -> {
+                final Drawable icon = AppUtils.getIcon(getContext(), mEntry);
+                ThreadUtils.postOnMainThread(() -> {
+                    setIcon(icon);
+                    mCacheIcon = icon;
+                });
+            });
+        }
+        super.onBindViewHolder(view);
+    }
 }

src/com/android/settings/applications/managedomainurls/DomainAppPreferenceController.java

@@ -20,7 +20,6 @@ import android.app.Application;
 import android.content.Context;
 import android.text.TextUtils;
 import android.util.ArrayMap;
-import android.util.IconDrawableFactory;
 
 import androidx.preference.Preference;
 import androidx.preference.PreferenceGroup;
@@ -30,6 +29,7 @@ import com.android.settings.R;
 import com.android.settings.applications.AppInfoBase;
 import com.android.settings.applications.intentpicker.AppLaunchSettings;
 import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.applications.AppUtils;
 import com.android.settingslib.applications.ApplicationsState;
 import com.android.settingslib.applications.ApplicationsState.AppEntry;
 
@@ -98,6 +98,10 @@ public class DomainAppPreferenceController extends BasePreferenceController impl
         if (mContext == null) {
             return;
         }
+        // Preload top visible icons of app list.
+        AppUtils.preloadTopIcons(mContext, apps,
+                mContext.getResources().getInteger(R.integer.config_num_visible_app_icons));
+
         rebuildAppList(mDomainAppList, apps);
     }
 
@@ -157,13 +161,12 @@ public class DomainAppPreferenceController extends BasePreferenceController impl
         cacheAllPrefs(group);
         final int size = apps.size();
         final Context context = group.getContext();
-        final IconDrawableFactory iconDrawableFactory = IconDrawableFactory.newInstance(context);
         for (int i = 0; i < size; i++) {
             final AppEntry entry = apps.get(i);
             final String key = entry.info.packageName + "|" + entry.info.uid;
             DomainAppPreference preference = (DomainAppPreference) getCachedPreference(key);
             if (preference == null) {
-                preference = new DomainAppPreference(context, iconDrawableFactory, entry);
+                preference = new DomainAppPreference(context, entry);
                 preference.setKey(key);
                 group.addPreference(preference);
             } else {

src/com/android/settings/applications/managedomainurls/ManageDomainUrls.java

@@ -24,6 +24,7 @@ import android.content.Context;
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.applications.AppIconCacheManager;
 import com.android.settingslib.search.SearchIndexable;
 
 /**
@@ -58,4 +59,10 @@ public class ManageDomainUrls extends DashboardFragment {
 
     public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider(R.xml.manage_domain_url_settings);
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        AppIconCacheManager.getInstance().release();
+    }
 }

tests/robotests/src/com/android/settings/applications/managedomainurls/DomainAppPreferenceControllerTest.java

@@ -29,7 +29,6 @@ import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.verify.domain.DomainVerificationManager;
 import android.content.pm.verify.domain.DomainVerificationUserState;
-import android.util.IconDrawableFactory;
 
 import com.android.settings.R;
 import com.android.settingslib.applications.ApplicationsState;
@@ -49,18 +48,14 @@ public class DomainAppPreferenceControllerTest {
 
     private ApplicationsState.AppEntry mAppEntry;
     private Context mContext;
-    private IconDrawableFactory mIconDrawableFactory;
 
     @Mock
     private DomainVerificationManager mDomainVerificationManager;
-    @Mock
-    private DomainVerificationUserState mDomainVerificationUserState;
 
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
         mContext = spy(RuntimeEnvironment.application);
-        mIconDrawableFactory = IconDrawableFactory.newInstance(mContext);
         mAppEntry = new ApplicationsState.AppEntry(
                 mContext, createApplicationInfo(mContext.getPackageName()), 0);
         when(mContext.getSystemService(DomainVerificationManager.class)).thenReturn(
@@ -75,8 +70,7 @@ public class DomainAppPreferenceControllerTest {
         doReturn(domainVerificationUserState).when(
                 mDomainVerificationManager).getDomainVerificationUserState(anyString());
         doReturn(true).when(domainVerificationUserState).isLinkHandlingAllowed();
-        final DomainAppPreference pref = new DomainAppPreference(
-                mContext, mIconDrawableFactory, mAppEntry);
+        final DomainAppPreference pref = new DomainAppPreference(mContext, mAppEntry);
 
         assertThat(pref.getLayoutResource()).isEqualTo(R.layout.preference_app);
     }