Add an empty text when there is no app view.

This widget only shows title and empty text
when there is no any app view shown.

Test: visual, robotest
Bug: 120873123
Change-Id: I2079c1e47de5b7fb2d4ea4740dfba4809375c7c1

3 files changed, 72 insertions, 4 deletions

diff --git a/packages/SettingsLib/EntityHeaderWidgets/res/layout/app_entities_header.xml b/packages/SettingsLib/EntityHeaderWidgets/res/layout/app_entities_header.xml
index 9f30eda242f6..716fc8ded734 100644
--- a/packages/SettingsLib/EntityHeaderWidgets/res/layout/app_entities_header.xml
+++ b/packages/SettingsLib/EntityHeaderWidgets/res/layout/app_entities_header.xml
@@ -33,7 +33,7 @@
         android:textAppearance="@style/AppEntitiesHeader.Text.HeaderTitle"/>
 
     <LinearLayout
-        android:id="@+id/all_apps_view"
+        android:id="@+id/app_views_container"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:paddingTop="16dp"
@@ -61,4 +61,12 @@
         android:layout_height="48dp"
         android:gravity="center"/>
 
+    <TextView
+        android:id="@+id/empty_view"
+        android:layout_width="match_parent"
+        android:layout_height="106dp"
+        android:gravity="center"
+        android:visibility="gone"
+        android:textAppearance="@style/AppEntitiesHeader.Text.Summary"/>
+
 </LinearLayout>
diff --git a/packages/SettingsLib/EntityHeaderWidgets/src/com/android/settingslib/widget/AppEntitiesHeaderController.java b/packages/SettingsLib/EntityHeaderWidgets/src/com/android/settingslib/widget/AppEntitiesHeaderController.java
index 73cb8db136b5..330049fc6673 100644
--- a/packages/SettingsLib/EntityHeaderWidgets/src/com/android/settingslib/widget/AppEntitiesHeaderController.java
+++ b/packages/SettingsLib/EntityHeaderWidgets/src/com/android/settingslib/widget/AppEntitiesHeaderController.java
@@ -77,9 +77,11 @@ public class AppEntitiesHeaderController {
 
     private final Context mContext;
     private final TextView mHeaderTitleView;
+    private final TextView mHeaderEmptyView;
     private final Button mHeaderDetailsView;
 
     private final AppEntityInfo[] mAppEntityInfos;
+    private final View mAppViewsContainer;
     private final View[] mAppEntityViews;
     private final ImageView[] mAppIconViews;
     private final TextView[] mAppTitleViews;
@@ -87,6 +89,7 @@ public class AppEntitiesHeaderController {
 
     private int mHeaderTitleRes;
     private int mHeaderDetailsRes;
+    private int mHeaderEmptyRes;
     private View.OnClickListener mDetailsOnClickListener;
 
     /**
@@ -104,6 +107,8 @@ public class AppEntitiesHeaderController {
         mContext = context;
         mHeaderTitleView = appEntitiesHeaderView.findViewById(R.id.header_title);
         mHeaderDetailsView = appEntitiesHeaderView.findViewById(R.id.header_details);
+        mHeaderEmptyView = appEntitiesHeaderView.findViewById(R.id.empty_view);
+        mAppViewsContainer = appEntitiesHeaderView.findViewById(R.id.app_views_container);
 
         mAppEntityInfos = new AppEntityInfo[MAXIMUM_APPS];
         mAppIconViews = new ImageView[MAXIMUM_APPS];
@@ -152,6 +157,14 @@ public class AppEntitiesHeaderController {
     }
 
     /**
+     * Sets the string resource id for the empty text.
+     */
+    public AppEntitiesHeaderController setHeaderEmptyRes(@StringRes int emptyRes) {
+        mHeaderEmptyRes = emptyRes;
+        return this;
+    }
+
+    /**
      * Set an app entity at a specified position view.
      *
      * @param index         the index at which the specified view is to be inserted
@@ -192,6 +205,12 @@ public class AppEntitiesHeaderController {
      */
     public void apply() {
         bindHeaderTitleView();
+
+        if (isAppEntityInfosEmpty()) {
+            setEmptyViewVisible(true);
+            return;
+        }
+        setEmptyViewVisible(false);
         bindHeaderDetailsView();
 
         // Rebind all apps view
@@ -245,4 +264,22 @@ public class AppEntitiesHeaderController {
             mAppSummaryViews[index].setText(summary);
         }
     }
+
+    private void setEmptyViewVisible(boolean visible) {
+        if (mHeaderEmptyRes != 0) {
+            mHeaderEmptyView.setText(mHeaderEmptyRes);
+        }
+        mHeaderEmptyView.setVisibility(visible ? View.VISIBLE : View.GONE);
+        mHeaderDetailsView.setVisibility(visible ? View.GONE : View.VISIBLE);
+        mAppViewsContainer.setVisibility(visible ? View.GONE : View.VISIBLE);
+    }
+
+    private boolean isAppEntityInfosEmpty() {
+        for (AppEntityInfo info : mAppEntityInfos) {
+            if (info != null) {
+                return false;
+            }
+        }
+        return true;
+    }
 }
diff --git a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/AppEntitiesHeaderControllerTest.java b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/AppEntitiesHeaderControllerTest.java
index 8c18c356159e..4c68c1476cff 100644
--- a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/AppEntitiesHeaderControllerTest.java
+++ b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/AppEntitiesHeaderControllerTest.java
@@ -60,6 +60,7 @@ public class AppEntitiesHeaderControllerTest {
                 .setOnClickListener(v -> {
                 })
                 .build();
+        mController.setAppEntity(0, mAppEntityInfo);
     }
 
     @Test
@@ -172,6 +173,8 @@ public class AppEntitiesHeaderControllerTest {
         mController.setAppEntity(0, mAppEntityInfo)
                 .setAppEntity(1, mAppEntityInfo)
                 .setAppEntity(2, mAppEntityInfo).apply();
+        final View appViewsContainer = mAppEntitiesHeaderView.findViewById(
+                R.id.app_views_container);
         final View app1View = mAppEntitiesHeaderView.findViewById(R.id.app1_view);
         final View app2View = mAppEntitiesHeaderView.findViewById(R.id.app2_view);
         final View app3View = mAppEntitiesHeaderView.findViewById(R.id.app3_view);
@@ -181,8 +184,28 @@ public class AppEntitiesHeaderControllerTest {
         assertThat(app3View.getVisibility()).isEqualTo(View.VISIBLE);
 
         mController.clearAllAppEntities().apply();
-        assertThat(app1View.getVisibility()).isEqualTo(View.GONE);
-        assertThat(app2View.getVisibility()).isEqualTo(View.GONE);
-        assertThat(app3View.getVisibility()).isEqualTo(View.GONE);
+
+        assertThat(appViewsContainer.getVisibility()).isEqualTo(View.GONE);
+    }
+
+    @Test
+    public void apply_noAppEntitySet_shouldOnlyShowTitleAndEmptyView() {
+        mController.setHeaderTitleRes(R.string.expand_button_title)
+                .setAppEntity(0, mAppEntityInfo)
+                .setAppEntity(1, mAppEntityInfo)
+                .setAppEntity(2, mAppEntityInfo).apply();
+        final View titleView = mAppEntitiesHeaderView.findViewById(R.id.header_title);
+        final View detailsView = mAppEntitiesHeaderView.findViewById(R.id.header_details);
+        final View emptyView = mAppEntitiesHeaderView.findViewById(R.id.empty_view);
+        final View appViewsContainer = mAppEntitiesHeaderView.findViewById(
+                R.id.app_views_container);
+
+        mController.clearAllAppEntities().apply();
+
+        assertThat(titleView.getVisibility()).isEqualTo(View.VISIBLE);
+        assertThat(emptyView.getVisibility()).isEqualTo(View.VISIBLE);
+
+        assertThat(detailsView.getVisibility()).isEqualTo(View.GONE);
+        assertThat(appViewsContainer.getVisibility()).isEqualTo(View.GONE);
     }
 }