Add device name to About Phone page.

The device name is reflected in three places: A Settings.Global flag
which can be read by third party apps, the Bluetooth device name, and
the Wi-Fi tethering hotspot name.

The Bluetooth and Wi-Fi names can be changed independently of the device
name, but if the user sets the device name, they are all changed in
parallel.

Due to the naming restrictions of Bluetooth devices and SSIDs, the SSID
naming restrictions apply to the device name.

Bug: 63819909
Test: Robotest
Change-Id: I3a81535fc07d183557a6fa5d54baef3c7868499c

tests/robotests/src/com/android/settings/deviceinfo/DeviceNamePreferenceControllerTest.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 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.deviceinfo;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiManager;
+import android.os.Build;
+import android.provider.Settings;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settings.widget.ValidatedEditTextPreference;
+import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
+import com.android.settingslib.bluetooth.LocalBluetoothManager;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Answers;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowApplication;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class DeviceNamePreferenceControllerTest {
+    private static final String TESTING_STRING = "Testing";
+
+    @Mock
+    private LocalBluetoothAdapter mBluetoothAdapter;
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+    private LocalBluetoothManager mBluetoothManager;
+    @Mock
+    private WifiManager mWifiManager;
+    @Mock
+    private PreferenceScreen mScreen;
+    private ValidatedEditTextPreference mPreference;
+    private DeviceNamePreferenceController mController;
+    private Context mContext;
+
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        ShadowApplication shadowApplication = ShadowApplication.getInstance();
+        shadowApplication.setSystemService(Context.WIFI_SERVICE, mWifiManager);
+        mContext = shadowApplication.getApplicationContext();
+        mPreference = new ValidatedEditTextPreference(mContext);
+        when(mBluetoothManager.getBluetoothAdapter()).thenReturn(mBluetoothAdapter);
+        when(mScreen.findPreference(anyString())).thenReturn(mPreference);
+        final WifiConfiguration configuration = new WifiConfiguration();
+        configuration.SSID = "test-ap";
+        when(mWifiManager.getWifiApConfiguration()).thenReturn(configuration);
+
+        mController = new DeviceNamePreferenceController(mContext);
+        mController.setLocalBluetoothManager(mBluetoothManager);
+    }
+
+    @Test
+    public void constructor_defaultDeviceNameIsModelName() {
+        assertThat(mController.getSummary()).isEqualTo(Build.MODEL);
+    }
+
+    @Test
+    public void constructor_deviceNameLoadedIfSet() {
+        Settings.Global.putString(mContext.getContentResolver(), Settings.Global.DEVICE_NAME,
+                "Test");
+        mController = new DeviceNamePreferenceController(mContext);
+        mController.setLocalBluetoothManager(mBluetoothManager);
+        assertThat(mController.getSummary()).isEqualTo("Test");
+    }
+
+    @Test
+    public void isTextValid_nameUnder33CharactersIsValid() {
+        assertThat(mController.isTextValid("12345678901234567890123456789012")).isTrue();
+    }
+
+    @Test
+    public void isTextValid_nameTooLongIsInvalid() {
+        assertThat(mController.isTextValid("123456789012345678901234567890123")).isFalse();
+    }
+
+    @Test
+    public void setDeviceName_preferenceUpdatedWhenDeviceNameUpdated() {
+        mController.onPreferenceChange(mPreference, TESTING_STRING);
+
+        assertThat(mPreference.getSummary()).isEqualTo(TESTING_STRING);
+    }
+
+    @Test
+    public void setDeviceName_bluetoothNameUpdatedWhenDeviceNameUpdated() {
+        mController.onPreferenceChange(mPreference, TESTING_STRING);
+
+        verify(mBluetoothAdapter).setName(eq(TESTING_STRING));
+    }
+
+    @Test
+    public void setDeviceName_wifiTetherNameUpdatedWhenDeviceNameUpdated() {
+        mController.onPreferenceChange(mPreference, TESTING_STRING);
+
+        ArgumentCaptor<WifiConfiguration> captor = ArgumentCaptor.forClass(WifiConfiguration.class);
+        verify(mWifiManager).setWifiApConfiguration(captor.capture());
+        assertThat(captor.getValue().SSID).isEqualTo(TESTING_STRING);
+    }
+}