Add infrastructure for connected device group.

The core thing is to find out a way to update group when devices
(bt device and usb device)are updated.

The infrastructure contains three parts:
1. ConnectedDeviceController
Normal PreferenceController. Get info from sub controller and update
the preferenceGroup.

2. BluetoothDeviceUpdater
Listen to bluetooth callback, decide whether to add/remove devices

3. DevicePreferenceCallback
Interface to add/remove preference. This interface will be used in
ConntectedDeviceController and future SavedDeviceController

Bug: 69333961
Test: RunsettingsRoboTests
Change-Id: I85a9ef216a801d5f0dd1cf0130d53850a68be4bd

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

@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2017 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.Matchers.any;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+
+import android.bluetooth.BluetoothDevice;
+import android.content.Context;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.R;
+import com.android.settings.SettingsActivity;
+import com.android.settings.TestConfig;
+import com.android.settings.connecteddevice.DevicePreferenceCallback;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settingslib.bluetooth.CachedBluetoothDevice;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION_O)
+public class BluetoothDeviceUpdaterTest {
+    @Mock
+    private DashboardFragment mDashboardFragment;
+    @Mock
+    private DevicePreferenceCallback mDevicePreferenceCallback;
+    @Mock
+    private CachedBluetoothDevice mCachedBluetoothDevice;
+    @Mock
+    private BluetoothDevice mBluetoothDevice;
+    @Mock
+    private SettingsActivity mSettingsActivity;
+
+    private Context mContext;
+    private BluetoothDeviceUpdater mBluetoothDeviceUpdater;
+    private BluetoothDevicePreference mPreference;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = RuntimeEnvironment.application;
+        doReturn(mContext).when(mDashboardFragment).getContext();
+        doReturn(mBluetoothDevice).when(mCachedBluetoothDevice).getDevice();
+
+        mPreference = new BluetoothDevicePreference(mContext, mCachedBluetoothDevice, false);
+        mBluetoothDeviceUpdater = new BluetoothDeviceUpdater(mDashboardFragment,
+                mDevicePreferenceCallback, null) {
+            @Override
+            public void update(CachedBluetoothDevice cachedBluetoothDevice) {
+                // do nothing
+            }
+        };
+        mBluetoothDeviceUpdater.setPrefContext(mContext);
+    }
+
+    @Test
+    public void testAddPreference_deviceExist_doNothing() {
+        mBluetoothDeviceUpdater.mPreferenceMap.put(mBluetoothDevice, mPreference);
+
+        mBluetoothDeviceUpdater.addPreference(mCachedBluetoothDevice);
+
+        verify(mDevicePreferenceCallback, never()).onDeviceAdded(any(Preference.class));
+    }
+
+    @Test
+    public void testAddPreference_deviceNotExist_addPreference() {
+        mBluetoothDeviceUpdater.addPreference(mCachedBluetoothDevice);
+
+        verify(mDevicePreferenceCallback).onDeviceAdded(any(Preference.class));
+        assertThat(mBluetoothDeviceUpdater.mPreferenceMap.containsKey(mBluetoothDevice)).isTrue();
+    }
+
+    @Test
+    public void testRemovePreference_deviceExist_removePreference() {
+        mBluetoothDeviceUpdater.mPreferenceMap.put(mBluetoothDevice, mPreference);
+
+        mBluetoothDeviceUpdater.removePreference(mCachedBluetoothDevice);
+
+        verify(mDevicePreferenceCallback).onDeviceRemoved(mPreference);
+        assertThat(mBluetoothDeviceUpdater.mPreferenceMap.containsKey(mBluetoothDevice)).isFalse();
+    }
+
+    @Test
+    public void testRemovePreference_deviceNotExist_doNothing() {
+        mBluetoothDeviceUpdater.removePreference(mCachedBluetoothDevice);
+
+        verify(mDevicePreferenceCallback, never()).onDeviceRemoved(any(Preference.class));
+    }
+
+    @Test
+    public void testDeviceProfilesListener_click_startBluetoothDeviceDetailPage() {
+        doReturn(mSettingsActivity).when(mDashboardFragment).getActivity();
+
+        mBluetoothDeviceUpdater.mDeviceProfilesListener.onGearClick(mPreference);
+
+        verify(mSettingsActivity).startPreferencePanel(eq(mDashboardFragment),
+                eq(BluetoothDeviceDetailsFragment.class.getName()), any(),
+                eq(R.string.device_details_title), eq(null), eq(null), eq(0));
+    }
+}