Update Network & internet->Wi-Fi to use MasterSwitchPreference.

- Add a preference controller for Network & internet->Wi-Fi to control
  the preference toggling and summary update.
- Refactor WifiSettings and WifiEnabler to share code between the new
  wifi preference controller and the wifi setting.
- Refactor BluetoothSummaryHelper to have a common base class with the
  WifiSummaryHelper.
- Rename the summary helper to summary updater.

Bug: 34280769
Test: make RunSettingsRoboTests
Change-Id: I00ebfc161bcef89331bb41ba405ed8cb8232d248

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

@@ -0,0 +1,126 @@
+/*
+ * 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.widget;
+
+import android.content.Context;
+
+import com.android.settings.R;
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Answers;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class SummaryUpdaterTest {
+
+    private Context mContext;
+
+    private SummaryUpdaterTestable mSummaryUpdater;
+    @Mock
+    private SummaryListener mListener;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = RuntimeEnvironment.application.getApplicationContext();
+        mSummaryUpdater = new SummaryUpdaterTestable(mContext, mListener);
+    }
+
+    @Test
+    public void notifyChangeIfNeeded_fistTimeInit_shouldNotifyChange() {
+        final String summary = "initialized";
+        mSummaryUpdater.setTestSummary(summary);
+        mSummaryUpdater.notifyChangeIfNeeded();
+
+        verify(mListener).onSummaryChanged(summary);
+    }
+
+    @Test
+    public void notifyChangeIfNeeded_summaryUpdated_shouldNotifyChange() {
+        final String summaryInit = "initialized";
+        mSummaryUpdater.setTestSummary(summaryInit);
+        mSummaryUpdater.notifyChangeIfNeeded();
+        final String summaryUpdate = "updated";
+
+        mSummaryUpdater.setTestSummary(summaryUpdate);
+        mSummaryUpdater.notifyChangeIfNeeded();
+
+        verify(mListener).onSummaryChanged(summaryUpdate);
+    }
+
+    @Test
+    public void notifyChangeIfNeeded_summaryNotUpdated_shouldOnlyNotifyChangeOnce() {
+        final String summaryInit = "initialized";
+        mSummaryUpdater.setTestSummary(summaryInit);
+        mSummaryUpdater.notifyChangeIfNeeded();
+        final String summaryUpdate = "updated";
+        mSummaryUpdater.setTestSummary(summaryUpdate);
+
+        mSummaryUpdater.notifyChangeIfNeeded();
+        mSummaryUpdater.notifyChangeIfNeeded();
+
+        verify(mListener, times(1)).onSummaryChanged(summaryUpdate);
+    }
+
+    private class SummaryListener implements SummaryUpdater.OnSummaryChangeListener {
+        String summary;
+
+        @Override
+        public void onSummaryChanged(String summary) {
+            this.summary = summary;
+        }
+    }
+
+    public final class SummaryUpdaterTestable extends SummaryUpdater {
+        private String mTestSummary;
+
+        SummaryUpdaterTestable(Context context, SummaryUpdater.OnSummaryChangeListener listener) {
+            super(context, listener);
+        }
+
+        @Override
+        public void register(boolean register) {
+        }
+
+        @Override
+        public void notifyChangeIfNeeded() {
+            super.notifyChangeIfNeeded();
+        }
+
+        @Override
+        public String getSummary() {
+            return mTestSummary;
+        }
+
+        public void setTestSummary(String summary) {
+            mTestSummary = summary;
+        }
+    }
+}