Display network name in status bar

When config_showOperatorNameInStatusBar is true, "Network name" setting
is displayed in Settings app (Settings > Display).
The user can turn on/off the feature to display the network name in the
status bar from Settings app.

Fixes: 67620513
Test: manual - go to Settings > Display and turn on/off Network name.

Change-Id: I43f1d9cbea363527250639ce6146f1c5c6c8a482

src/com/android/settings/display/ShowOperatorNamePreferenceController.java

@@ -0,0 +1,57 @@
+/*
+ * 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.display;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.R;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+public class ShowOperatorNamePreferenceController extends AbstractPreferenceController
+        implements Preference.OnPreferenceChangeListener {
+
+    private static final String KEY_SHOW_OPERATOR_NAME = "show_operator_name";
+
+    public ShowOperatorNamePreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mContext.getResources().getBoolean(R.bool.config_showOperatorNameInStatusBar);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_SHOW_OPERATOR_NAME;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        boolean value = (Boolean) newValue;
+        Settings.Secure.putInt(mContext.getContentResolver(),
+                KEY_SHOW_OPERATOR_NAME, value ? 1 : 0);
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        int value = Settings.Secure.getInt(mContext.getContentResolver(),
+                KEY_SHOW_OPERATOR_NAME, 1);
+        ((SwitchPreference) preference).setChecked(value != 0);
+    }
+}