Show "Doesn't support work profiles" text in Settings for launchers not

supporting work profiles.

Screenshot: https://screenshot.googleplex.com/iz3xoeSvbOA.png

Test: Manually go to Settings -> Apps & notifications -> Default apps -> Home app.
Test: make ROBOTEST_FILTER=RadioButtonPreferenceTest -j40 RunSettingsRoboTests
Bug: 69297461
Change-Id: I55c721d7ad979c882bb879a974758cf08eaf0c86

src/com/android/settings/widget/RadioButtonPreference.java

@@ -20,7 +20,9 @@ import android.content.Context;
 import android.support.v4.content.res.TypedArrayUtils;
 import android.support.v7.preference.CheckBoxPreference;
 import android.support.v7.preference.PreferenceViewHolder;
+import android.text.TextUtils;
 import android.util.AttributeSet;
+import android.view.View;
 import android.widget.TextView;
 
 import com.android.settings.R;
@@ -72,6 +74,12 @@ public class RadioButtonPreference extends CheckBoxPreference {
     public void onBindViewHolder(PreferenceViewHolder view) {
         super.onBindViewHolder(view);
 
+        View summaryContainer = view.findViewById(R.id.summary_container);
+        if (summaryContainer != null) {
+            summaryContainer.setVisibility(
+                TextUtils.isEmpty(getSummary()) ? View.GONE : View.VISIBLE);
+        }
+
         TextView title = (TextView) view.findViewById(android.R.id.title);
         if (title != null) {
             title.setSingleLine(false);

tests/robotests/src/com/android/settings/widget/RadioButtonPreferenceTest.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.widget;
+
+import static junit.framework.Assert.assertEquals;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import android.app.Application;
+import android.support.v7.preference.PreferenceViewHolder;
+import android.view.View;
+
+import com.android.settings.R;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class RadioButtonPreferenceTest {
+
+    private Application mContext;
+    private RadioButtonPreference mPreference;
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+        mPreference = new RadioButtonPreference(mContext);
+    }
+
+    @Test
+    public void summary_containerShouldBeVisible() {
+        mPreference.setSummary("some summary");
+        View summaryContainer = new View(mContext);
+        View view = mock(View.class);
+        when(view.findViewById(R.id.summary_container)).thenReturn(summaryContainer);
+        PreferenceViewHolder preferenceViewHolder =
+                PreferenceViewHolder.createInstanceForTests(view);
+        mPreference.onBindViewHolder(preferenceViewHolder);
+        assertEquals(View.VISIBLE, summaryContainer.getVisibility());
+    }
+
+    @Test
+    public void emptySummary_containerShouldBeGone() {
+        mPreference.setSummary("");
+        View summaryContainer = new View(mContext);
+        View view = mock(View.class);
+        when(view.findViewById(R.id.summary_container)).thenReturn(summaryContainer);
+        PreferenceViewHolder preferenceViewHolder =
+                PreferenceViewHolder.createInstanceForTests(view);
+        mPreference.onBindViewHolder(preferenceViewHolder);
+        assertEquals(View.GONE, summaryContainer.getVisibility());
+    }
+
+    @Test
+    public void nullSummary_containerShouldBeGone() {
+        mPreference.setSummary(null);
+        View summaryContainer = new View(mContext);
+        View view = mock(View.class);
+        when(view.findViewById(R.id.summary_container)).thenReturn(summaryContainer);
+        PreferenceViewHolder preferenceViewHolder =
+                PreferenceViewHolder.createInstanceForTests(view);
+        mPreference.onBindViewHolder(preferenceViewHolder);
+        assertEquals(View.GONE, summaryContainer.getVisibility());
+    }
+}