Add bluetooth visible item

Show "Visible as [Device name]". Also remove the menuitem for
changing device name.

This cl creates a preference controller to handle the logic for
device name preference.

Bug: 35876447
Test: RunSettingsRoboTests

Change-Id: I9ab6c9d2df5b053d15b8ff887073ef82616243a4

src/com/android/settings/bluetooth/BluetoothDeviceNamePreferenceController.java

@@ -0,0 +1,169 @@
+/*
+ * 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 android.app.Fragment;
+import android.bluetooth.BluetoothAdapter;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.Spannable;
+import android.text.SpannableString;
+import android.text.TextUtils;
+import android.text.style.ForegroundColorSpan;
+import android.util.Log;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.R;
+import com.android.settings.core.PreferenceController;
+import com.android.settings.core.lifecycle.Lifecycle;
+import com.android.settings.core.lifecycle.LifecycleObserver;
+import com.android.settings.core.lifecycle.events.OnResume;
+import com.android.settings.core.lifecycle.events.OnStart;
+import com.android.settings.core.lifecycle.events.OnStop;
+import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
+import com.android.settingslib.bluetooth.LocalBluetoothManager;
+
+/**
+ * Controller that shows and updates the bluetooth device name
+ */
+public class BluetoothDeviceNamePreferenceController extends PreferenceController implements
+        LifecycleObserver, OnStart, OnStop {
+    private static final String TAG = "BluetoothNamePrefCtrl";
+
+    public static final String KEY_DEVICE_NAME = "device_name";
+    private int mAccentColor;
+    private Fragment mFragment;
+    private LocalBluetoothManager mLocalManager;
+    private LocalBluetoothAdapter mLocalAdapter;
+    private Preference mPreference;
+
+    public BluetoothDeviceNamePreferenceController(Context context, Fragment fragment,
+            Lifecycle lifecycle) {
+        this(context, fragment, (LocalBluetoothAdapter) null);
+
+        mLocalManager = Utils.getLocalBtManager(context);
+        if (mLocalManager == null) {
+            Log.e(TAG, "Bluetooth is not supported on this device");
+            return;
+        }
+        mLocalAdapter = mLocalManager.getBluetoothAdapter();
+        lifecycle.addObserver(this);
+    }
+
+    @VisibleForTesting
+    BluetoothDeviceNamePreferenceController(Context context, Fragment fragment,
+            LocalBluetoothAdapter localAdapter) {
+        super(context);
+        mAccentColor = com.android.settingslib.Utils.getColorAccent(context);
+        mFragment = fragment;
+        mLocalAdapter = localAdapter;
+    }
+
+    @Override
+    public void onStart() {
+        mContext.registerReceiver(mReceiver,
+                new IntentFilter(BluetoothAdapter.ACTION_LOCAL_NAME_CHANGED));
+    }
+
+    @Override
+    public void onStop() {
+        mContext.unregisterReceiver(mReceiver);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mLocalAdapter != null;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_DEVICE_NAME;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        updateDeviceName(preference, mLocalAdapter.getName());
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (KEY_DEVICE_NAME.equals(preference.getKey())) {
+            new BluetoothNameDialogFragment().show(mFragment.getFragmentManager(), "rename device");
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Create preference to show bluetooth device name
+     *
+     * @param screen to add the preference in
+     * @param order to decide position of the preference
+     * @return bluetooth preference that created in this method
+     */
+    public Preference createBluetoothDeviceNamePreference(PreferenceScreen screen, int order) {
+        mPreference = new Preference(screen.getContext());
+        mPreference.setOrder(order);
+        mPreference.setKey(KEY_DEVICE_NAME);
+        screen.addPreference(mPreference);
+
+        return mPreference;
+    }
+
+    /**
+     * Update device summary with {@code deviceName}, where {@code deviceName} has accent color
+     *
+     * @param preference to set the summary for
+     * @param deviceName bluetooth device name to show in the summary
+     */
+    public void updateDeviceName(final Preference preference, final String deviceName) {
+        if (deviceName == null) {
+            // TODO: show error message in preference subtitle
+            return;
+        }
+        final Spannable spannableName = new SpannableString(deviceName);
+        spannableName.setSpan(new ForegroundColorSpan(mAccentColor), 0,
+                spannableName.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        final CharSequence summary = TextUtils.expandTemplate(
+                mContext.getText(R.string.bluetooth_device_name_summary), spannableName);
+
+        preference.setSummary(summary);
+    }
+
+    /**
+     * Receiver that listens to {@link BluetoothAdapter#ACTION_LOCAL_NAME_CHANGED} and updates the
+     * device name if possible
+     */
+    @VisibleForTesting
+    final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            final String action = intent.getAction();
+
+            if (TextUtils.equals(action, BluetoothAdapter.ACTION_LOCAL_NAME_CHANGED)) {
+                if (mPreference != null && mLocalAdapter != null && mLocalAdapter.isEnabled()) {
+                    updateDeviceName(mPreference, mLocalAdapter.getName());
+                }
+            }
+        }
+    };
+}