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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings.connecteddevice;
     18 
     19 import android.bluetooth.BluetoothAdapter;
     20 import android.content.BroadcastReceiver;
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.content.IntentFilter;
     24 import android.content.pm.PackageManager;
     25 import android.support.v7.preference.PreferenceScreen;
     26 import android.text.BidiFormatter;
     27 import android.text.TextUtils;
     28 
     29 import com.android.internal.annotations.VisibleForTesting;
     30 import com.android.settings.bluetooth.AlwaysDiscoverable;
     31 import com.android.settings.bluetooth.Utils;
     32 import com.android.settings.core.BasePreferenceController;
     33 import com.android.settings.dashboard.DashboardFragment;
     34 import com.android.settings.R;
     35 import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
     36 import com.android.settingslib.bluetooth.LocalBluetoothManager;
     37 import com.android.settingslib.core.lifecycle.events.OnPause;
     38 import com.android.settingslib.core.lifecycle.events.OnResume;
     39 import com.android.settingslib.core.lifecycle.LifecycleObserver;
     40 import com.android.settingslib.widget.FooterPreference;
     41 import com.android.settingslib.widget.FooterPreferenceMixin;
     42 
     43 /**
     44  * Controller that shows and updates the bluetooth device name
     45  */
     46 public class DiscoverableFooterPreferenceController extends BasePreferenceController
     47         implements LifecycleObserver, OnResume, OnPause {
     48     private static final String KEY = "discoverable_footer_preference";
     49 
     50     @VisibleForTesting
     51     BroadcastReceiver mBluetoothChangedReceiver;
     52     private FooterPreferenceMixin mFooterPreferenceMixin;
     53     private FooterPreference mPreference;
     54     private LocalBluetoothManager mLocalManager;
     55     private LocalBluetoothAdapter mLocalAdapter;
     56     private AlwaysDiscoverable mAlwaysDiscoverable;
     57 
     58     public DiscoverableFooterPreferenceController(Context context) {
     59         super(context, KEY);
     60         mLocalManager = Utils.getLocalBtManager(context);
     61         if (mLocalManager == null) {
     62             return;
     63         }
     64         mLocalAdapter = mLocalManager.getBluetoothAdapter();
     65         mAlwaysDiscoverable = new AlwaysDiscoverable(context, mLocalAdapter);
     66         initReceiver();
     67     }
     68 
     69     private void initReceiver() {
     70         mBluetoothChangedReceiver = new BroadcastReceiver() {
     71             @Override
     72             public void onReceive(Context context, Intent intent) {
     73                 if (intent.getAction().equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
     74                     final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
     75                             BluetoothAdapter.ERROR);
     76                     updateFooterPreferenceTitle(state);
     77                 }
     78             }
     79         };
     80     }
     81 
     82     public void init(DashboardFragment fragment) {
     83         mFooterPreferenceMixin = new FooterPreferenceMixin(fragment, fragment.getLifecycle());
     84     }
     85 
     86     @VisibleForTesting
     87     void init(FooterPreferenceMixin footerPreferenceMixin, FooterPreference preference,
     88             AlwaysDiscoverable alwaysDiscoverable) {
     89         mFooterPreferenceMixin = footerPreferenceMixin;
     90         mPreference = preference;
     91         mAlwaysDiscoverable = alwaysDiscoverable;
     92     }
     93 
     94     @Override
     95     public void displayPreference(PreferenceScreen screen) {
     96         super.displayPreference(screen);
     97         addFooterPreference(screen);
     98     }
     99 
    100     @Override
    101     public int getAvailabilityStatus() {
    102         return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)
    103                 ? AVAILABLE
    104                 : UNSUPPORTED_ON_DEVICE;
    105     }
    106 
    107     private void addFooterPreference(PreferenceScreen screen) {
    108         mPreference = mFooterPreferenceMixin.createFooterPreference();
    109         mPreference.setKey(KEY);
    110         screen.addPreference(mPreference);
    111     }
    112 
    113     @Override
    114     public void onResume() {
    115         mContext.registerReceiver(mBluetoothChangedReceiver,
    116                 new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
    117         mAlwaysDiscoverable.start();
    118         updateFooterPreferenceTitle(mLocalAdapter.getState());
    119     }
    120 
    121     @Override
    122     public void onPause() {
    123         mContext.unregisterReceiver(mBluetoothChangedReceiver);
    124         mAlwaysDiscoverable.stop();
    125     }
    126 
    127     private void updateFooterPreferenceTitle (int bluetoothState) {
    128         if (bluetoothState == BluetoothAdapter.STATE_ON) {
    129             mPreference.setTitle(getPreferenceTitle());
    130         } else {
    131             mPreference.setTitle(R.string.bluetooth_off_footer);
    132         }
    133     }
    134 
    135     private CharSequence getPreferenceTitle() {
    136         final String deviceName = mLocalAdapter.getName();
    137         if (TextUtils.isEmpty(deviceName)) {
    138             return null;
    139         }
    140 
    141         return TextUtils.expandTemplate(
    142                 mContext.getText(R.string.bluetooth_device_name_summary),
    143                 BidiFormatter.getInstance().unicodeWrap(deviceName));
    144     }
    145 }