Use new API Build.getSerial() to get serial number.

Bug: 32935486
Test: RunSettingsRoboTests
Change-Id: I28b8d27d034b4a6c4ae5f29e8311e84e5c423967

src/com/android/settings/deviceinfo/SerialNumberPreferenceController.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2016 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.deviceinfo;
+
+import android.content.Context;
+import android.os.Build;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.TextUtils;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.core.PreferenceController;
+
+public class SerialNumberPreferenceController extends PreferenceController {
+
+    private static final String KEY_SERIAL_NUMBER = "serial_number";
+
+    private final String mSerialNumber;
+
+    public SerialNumberPreferenceController(Context context) {
+        this(context, Build.getSerial());
+    }
+
+    @VisibleForTesting
+    SerialNumberPreferenceController(Context context, String serialNumber) {
+        super(context);
+        mSerialNumber = serialNumber;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return !TextUtils.isEmpty(mSerialNumber);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        final Preference pref = screen.findPreference(KEY_SERIAL_NUMBER);
+        if (pref != null) {
+            pref.setSummary(mSerialNumber);
+        }
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        return false;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_SERIAL_NUMBER;
+    }
+}