Improve launch time for app & notification screen

- We won't query recent apps in getAvailabilityStatus().
And then we do that in background thread.
So, we can launch app & notificatins screen as soon as possible.

- Create a RecentAppStatsMixin class which is responsible
for maintaining the recent apps data.

- Controllers and fragment update their UI after they got
onReloadDataCompleted callback from RecentAppStatsMixin.

Test: manual, robotest
Fixes: 128849426
Fixes: 126453868
Change-Id: I636d5878cb5d53496978fe613c625382d8d382bc

tests/robotests/src/com/android/settings/applications/AllAppsInfoPreferenceControllerTest.java

@@ -17,16 +17,25 @@
 package com.android.settings.applications;
 
 import static com.android.settings.core.BasePreferenceController.AVAILABLE;
-import static com.android.settings.core.BasePreferenceController.CONDITIONALLY_UNAVAILABLE;
 
 import static com.google.common.truth.Truth.assertThat;
 
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
+
 import android.app.usage.UsageStats;
 import android.content.Context;
+import android.os.UserManager;
+
+import androidx.preference.Preference;
 
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
 
@@ -36,29 +45,45 @@ import java.util.List;
 @RunWith(RobolectricTestRunner.class)
 public class AllAppsInfoPreferenceControllerTest {
 
+    @Mock
+    private UserManager mUserManager;
     private AllAppsInfoPreferenceController mController;
 
     @Before
     public void setUp() {
-        final Context context = RuntimeEnvironment.application;
+        MockitoAnnotations.initMocks(this);
+        final Context context = spy(RuntimeEnvironment.application);
+        final Preference preference = new Preference(context);
+        doReturn(mUserManager).when(context).getSystemService(Context.USER_SERVICE);
+        when(mUserManager.getProfileIdsWithDisabled(anyInt())).thenReturn(new int[]{});
         mController = new AllAppsInfoPreferenceController(context, "test_key");
+        mController.mPreference = preference;
     }
 
     @Test
-    public void getAvailabilityStatus_hasRecentApps_shouldReturnConditionallyUnavailable() {
+    public void getAvailabilityStatus_shouldReturnAVAILABLE() {
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(AVAILABLE);
+    }
+
+    @Test
+    public void onReloadDataCompleted_recentAppsSet_hidePreference() {
         final List<UsageStats> stats = new ArrayList<>();
         final UsageStats stat1 = new UsageStats();
         stat1.mLastTimeUsed = System.currentTimeMillis();
         stat1.mPackageName = "pkg.class";
         stats.add(stat1);
-        mController.setRecentApps(stats);
 
-        assertThat(mController.getAvailabilityStatus()).isEqualTo(CONDITIONALLY_UNAVAILABLE);
+        mController.onReloadDataCompleted(stats);
+
+        assertThat(mController.mPreference.isVisible()).isFalse();
     }
 
     @Test
-    public void getAvailabilityStatus_noRecentApps_shouldReturnAvailable() {
-        // No data
-        assertThat(mController.getAvailabilityStatus()).isEqualTo(AVAILABLE);
+    public void onReloadDataCompleted_noRecentAppSet_showPreference() {
+        final List<UsageStats> stats = new ArrayList<>();
+
+        mController.onReloadDataCompleted(stats);
+
+        assertThat(mController.mPreference.isVisible()).isTrue();
     }
 }