Merge changes I6d4f8ec3,Id4c1e86c into pi-dev

* changes:
  Make device discoverable in Connected Devices settings page
  Add bluetooth discoverable footer preference in connected devices page

src/com/android/settings/connecteddevice/ConnectedDeviceDashboardFragment.java

@@ -26,7 +26,10 @@ import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.dashboard.SummaryLoader;
 import com.android.settings.nfc.NfcPreferenceController;
 import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.core.AbstractPreferenceController;
+import com.android.settingslib.core.lifecycle.Lifecycle;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
@@ -59,12 +62,32 @@ public class ConnectedDeviceDashboardFragment extends DashboardFragment {
         return R.xml.connected_devices;
     }
 
+    @Override
+    protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
+        return buildPreferenceControllers(context, getLifecycle());
+    }
+
+    private static List<AbstractPreferenceController> buildPreferenceControllers(Context context,
+            Lifecycle lifecycle) {
+        final List<AbstractPreferenceController> controllers = new ArrayList<>();
+        final DiscoverableFooterPreferenceController discoverableFooterPreferenceController =
+                new DiscoverableFooterPreferenceController(context);
+        controllers.add(discoverableFooterPreferenceController);
+
+        if (lifecycle != null) {
+            lifecycle.addObserver(discoverableFooterPreferenceController);
+        }
+
+        return controllers;
+    }
+
     @Override
     public void onAttach(Context context) {
         super.onAttach(context);
         use(AvailableMediaDeviceGroupController.class).init(this);
         use(ConnectedDeviceGroupController.class).init(this);
         use(PreviouslyConnectedDevicePreferenceController.class).init(this);
+        use(DiscoverableFooterPreferenceController.class).init(this);
     }
 
     @VisibleForTesting
@@ -109,6 +132,12 @@ public class ConnectedDeviceDashboardFragment extends DashboardFragment {
                     return Arrays.asList(sir);
                 }
 
+                @Override
+                public List<AbstractPreferenceController> createPreferenceControllers(Context
+                        context) {
+                    return buildPreferenceControllers(context, null /* lifecycle */);
+                }
+
                 @Override
                 public List<String> getNonIndexableKeys(Context context) {
                     List<String> keys = super.getNonIndexableKeys(context);

src/com/android/settings/connecteddevice/DiscoverableFooterPreferenceController.java

@@ -0,0 +1,145 @@
+/*
+ * 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.connecteddevice;
+
+import android.bluetooth.BluetoothAdapter;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.BidiFormatter;
+import android.text.TextUtils;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.bluetooth.AlwaysDiscoverable;
+import com.android.settings.bluetooth.Utils;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.R;
+import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
+import com.android.settingslib.bluetooth.LocalBluetoothManager;
+import com.android.settingslib.core.lifecycle.events.OnPause;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.widget.FooterPreference;
+import com.android.settingslib.widget.FooterPreferenceMixin;
+
+/**
+ * Controller that shows and updates the bluetooth device name
+ */
+public class DiscoverableFooterPreferenceController extends BasePreferenceController
+        implements LifecycleObserver, OnResume, OnPause {
+    private static final String KEY = "discoverable_footer_preference";
+
+    @VisibleForTesting
+    BroadcastReceiver mBluetoothChangedReceiver;
+    private FooterPreferenceMixin mFooterPreferenceMixin;
+    private FooterPreference mPreference;
+    private LocalBluetoothManager mLocalManager;
+    private LocalBluetoothAdapter mLocalAdapter;
+    private AlwaysDiscoverable mAlwaysDiscoverable;
+
+    public DiscoverableFooterPreferenceController(Context context) {
+        super(context, KEY);
+        mLocalManager = Utils.getLocalBtManager(context);
+        if (mLocalManager == null) {
+            return;
+        }
+        mLocalAdapter = mLocalManager.getBluetoothAdapter();
+        mAlwaysDiscoverable = new AlwaysDiscoverable(context, mLocalAdapter);
+        initReceiver();
+    }
+
+    private void initReceiver() {
+        mBluetoothChangedReceiver = new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                if (intent.getAction().equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
+                    final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
+                            BluetoothAdapter.ERROR);
+                    updateFooterPreferenceTitle(state);
+                }
+            }
+        };
+    }
+
+    public void init(DashboardFragment fragment) {
+        mFooterPreferenceMixin = new FooterPreferenceMixin(fragment, fragment.getLifecycle());
+    }
+
+    @VisibleForTesting
+    void init(FooterPreferenceMixin footerPreferenceMixin, FooterPreference preference,
+            AlwaysDiscoverable alwaysDiscoverable) {
+        mFooterPreferenceMixin = footerPreferenceMixin;
+        mPreference = preference;
+        mAlwaysDiscoverable = alwaysDiscoverable;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        addFooterPreference(screen);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)
+                ? AVAILABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+
+    private void addFooterPreference(PreferenceScreen screen) {
+        mPreference = mFooterPreferenceMixin.createFooterPreference();
+        mPreference.setKey(KEY);
+        screen.addPreference(mPreference);
+    }
+
+    @Override
+    public void onResume() {
+        mContext.registerReceiver(mBluetoothChangedReceiver,
+                new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
+        mAlwaysDiscoverable.start();
+        updateFooterPreferenceTitle(mLocalAdapter.getState());
+    }
+
+    @Override
+    public void onPause() {
+        mContext.unregisterReceiver(mBluetoothChangedReceiver);
+        mAlwaysDiscoverable.stop();
+    }
+
+    private void updateFooterPreferenceTitle (int bluetoothState) {
+        if (bluetoothState == BluetoothAdapter.STATE_ON) {
+            mPreference.setTitle(getPreferenceTitle());
+        } else {
+            mPreference.setTitle(R.string.bluetooth_off_footer);
+        }
+    }
+
+    private CharSequence getPreferenceTitle() {
+        final String deviceName = mLocalAdapter.getName();
+        if (TextUtils.isEmpty(deviceName)) {
+            return null;
+        }
+
+        return TextUtils.expandTemplate(
+                mContext.getText(R.string.bluetooth_device_name_summary),
+                BidiFormatter.getInstance().unicodeWrap(deviceName));
+    }
+}