Companion Device App showing in Settings

Added a feature that users are able to see/remove the apps' associations
in Settings/Connected devices.
It will display the icon of the associations app, app's name and a button
that users are able to remove the associations. Also it will pop up a
dialog alerting user before remove the associations.

Screenshot:
https://screenshot.googleplex.com/APSRhW2retYmAAK

Bug: 165951651
Test: Manually Test

Change-Id: Iccaeaf516e8a78d4ef33415c1c2d7379139ec88c

tests/robotests/src/com/android/settings/bluetooth/CompanionAppWidgetPreferenceTest.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2021 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.bluetooth;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.view.ContextThemeWrapper;
+import android.view.View;
+
+import com.android.settings.R;
+import com.android.settings.testutils.shadow.ShadowAlertDialogCompat;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(shadows = {ShadowAlertDialogCompat.class})
+public class CompanionAppWidgetPreferenceTest {
+    private static final String TITLE_ONE = "Test Title 1";
+    private static final String TITLE_TWO = "Test Title 1";
+    private static final String KEY_ONE = "Test Key 1";
+    private static final String KEY_TWO = "Test Key 1";
+
+    private Context mContext;
+    private Drawable mWidgetIconOne;
+    private Drawable mWidgetIconTwo;
+    private Drawable mAppIconOne;
+    private Drawable mAppIconTwo;
+
+    @Mock
+    private View.OnClickListener mWidgetListenerOne;
+    @Mock
+    private View.OnClickListener mWidgetListenerTwo;
+
+    private List<CompanionAppWidgetPreference> mPreferenceContainer;
+
+    @Before
+    public void setUp() {
+        mPreferenceContainer = new ArrayList<>();
+        Context context = spy(RuntimeEnvironment.application.getApplicationContext());
+        mContext = new ContextThemeWrapper(context, R.style.Theme_Settings);
+        mWidgetIconOne = mock(Drawable.class);
+        mAppIconOne = mock(Drawable.class);
+        mWidgetListenerOne = mock(View.OnClickListener.class);
+        mWidgetIconTwo = mock(Drawable.class);
+        mAppIconTwo = mock(Drawable.class);
+        mWidgetListenerTwo = mock(View.OnClickListener.class);
+    }
+
+    private void setUpPreferenceContainer(Drawable widgetIcon, Drawable appIcon,
+            View.OnClickListener listener, String title, String key) {
+        CompanionAppWidgetPreference preference = new CompanionAppWidgetPreference(
+                widgetIcon, listener, mContext);
+        preference.setIcon(appIcon);
+        preference.setTitle(title);
+        preference.setKey(key);
+        mPreferenceContainer.add(preference);
+    }
+
+    @Test
+    public void setUpPreferenceContainer_preferenceShouldBeAdded() {
+        setUpPreferenceContainer(
+                mWidgetIconOne, mAppIconOne, mWidgetListenerOne, TITLE_ONE, KEY_ONE);
+
+        assertThat(mPreferenceContainer.get(0).getIcon()).isEqualTo(mAppIconOne);
+        assertThat(mPreferenceContainer.get(0).getKey()).isEqualTo(KEY_ONE);
+        assertThat(mPreferenceContainer.get(0).getTitle()).isEqualTo(TITLE_ONE);
+
+        setUpPreferenceContainer(
+                mWidgetIconTwo, mAppIconTwo, mWidgetListenerTwo, TITLE_TWO, KEY_TWO);
+
+        assertThat(mPreferenceContainer.get(1).getIcon()).isEqualTo(mAppIconTwo);
+        assertThat(mPreferenceContainer.get(1).getKey()).isEqualTo(KEY_TWO);
+        assertThat(mPreferenceContainer.get(1).getTitle()).isEqualTo(TITLE_TWO);
+    }
+}