Update DialogFragment UI when BT device is add/remove/rename

* Add AudioSwitchCallback() in AudioSwitchPreferenceController.
  This callback is used to notify SoudSettings to update the dialogFragment UI.
* Add UpdatableListPreferenceDialogFragment that updates the available
  options when dialog is shown
* Add test to verify the adapter count when
  onListPreferenceUpdated() is called.

Bug: 77783217
Test: make -j50 RunSettingsRoboTests
Change-Id: I8cac1b30ec50df026f4b7722dd1cd2f69e77a4cb
Merged-In: I8cac1b30ec50df026f4b7722dd1cd2f69e77a4cb

tests/robotests/src/com/android/settings/sound/HandsFreeProfileOutputPreferenceControllerTest.java

@@ -16,7 +16,6 @@
 
 package com.android.settings.sound;
 
-
 import static android.media.AudioSystem.DEVICE_OUT_BLUETOOTH_SCO;
 import static android.media.AudioSystem.DEVICE_OUT_HEARING_AID;
 import static android.media.AudioSystem.DEVICE_OUT_USB_HEADSET;
@@ -93,6 +92,8 @@ public class HandsFreeProfileOutputPreferenceControllerTest {
     private HeadsetProfile mHeadsetProfile;
     @Mock
     private HearingAidProfile mHearingAidProfile;
+    @Mock
+    private AudioSwitchPreferenceController.AudioSwitchCallback mAudioSwitchPreferenceCallback;
 
     private Context mContext;
     private PreferenceScreen mScreen;
@@ -156,6 +157,7 @@ public class HandsFreeProfileOutputPreferenceControllerTest {
         when(mScreen.findPreference(mController.getPreferenceKey())).thenReturn(mPreference);
         mScreen.addPreference(mPreference);
         mController.displayPreference(mScreen);
+        mController.setCallback(mAudioSwitchPreferenceCallback);
     }
 
     @After

tests/robotests/src/com/android/settings/sound/MediaOutputPreferenceControllerTest.java

@@ -94,6 +94,8 @@ public class MediaOutputPreferenceControllerTest {
     private A2dpProfile mA2dpProfile;
     @Mock
     private HearingAidProfile mHearingAidProfile;
+    @Mock
+    private AudioSwitchPreferenceController.AudioSwitchCallback mAudioSwitchPreferenceCallback;
 
     private Context mContext;
     private PreferenceScreen mScreen;
@@ -157,6 +159,7 @@ public class MediaOutputPreferenceControllerTest {
         when(mScreen.findPreference(mController.getPreferenceKey())).thenReturn(mPreference);
         mScreen.addPreference(mPreference);
         mController.displayPreference(mScreen);
+        mController.setCallback(mAudioSwitchPreferenceCallback);
     }
 
     @After

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

@@ -0,0 +1,90 @@
+/*
+ * Copyright 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 com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+import android.support.v7.preference.ListPreference;
+import android.widget.ArrayAdapter;
+import com.android.internal.logging.nano.MetricsProto;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settings.testutils.shadow.ShadowBluetoothUtils;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import java.util.ArrayList;
+
+import static org.mockito.Mockito.spy;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(shadows = ShadowBluetoothUtils.class)
+public class UpdatableListPreferenceDialogFragmentTest {
+
+    private Context mContext;
+    private UpdatableListPreferenceDialogFragment mUpdatableListPrefDlgFragment;
+    private static final String KEY = "Test_Key";
+    private ArrayAdapter mAdapter;
+    private ArrayList<CharSequence> mEntries;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = RuntimeEnvironment.application;
+
+        mUpdatableListPrefDlgFragment = UpdatableListPreferenceDialogFragment
+                .newInstance(KEY, MetricsProto.MetricsEvent.DIALOG_SWITCH_A2DP_DEVICES);
+        mEntries = spy(new ArrayList<>());
+        mUpdatableListPrefDlgFragment.setEntries(mEntries);
+        mUpdatableListPrefDlgFragment.
+                setMetricsCategory(mUpdatableListPrefDlgFragment.getArguments());
+        initAdapter();
+    }
+
+    private void initAdapter() {
+        mAdapter = spy(new ArrayAdapter<>(
+                mContext,
+                com.android.internal.R.layout.select_dialog_singlechoice,
+                mEntries));
+        mUpdatableListPrefDlgFragment.setAdapter(mAdapter);
+    }
+
+    @Test
+    public void getMetricsCategory() {
+        assertThat(mUpdatableListPrefDlgFragment.getMetricsCategory())
+                .isEqualTo(MetricsProto.MetricsEvent.DIALOG_SWITCH_A2DP_DEVICES);
+    }
+
+    @Test
+    public void onListPreferenceUpdated_verifyAdapterCanBeUpdate() {
+        assertThat(mUpdatableListPrefDlgFragment.getAdapter().getCount()).
+                isEqualTo(0);
+
+        ListPreference listPreference = new ListPreference(mContext);
+        final CharSequence[] charSequences = {"Test_DEVICE_1", "Test_DEVICE_2"};
+        listPreference.setEntries(charSequences);
+        mUpdatableListPrefDlgFragment.onListPreferenceUpdated(listPreference);
+
+        assertThat(mUpdatableListPrefDlgFragment.getAdapter().getCount()).
+                isEqualTo(2);
+    }
+}