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      1 /*
      2  * Copyright (C) 2008 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.bluetooth;
     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.SharedPreferences;
     25 import android.os.Handler;
     26 import android.os.SystemProperties;
     27 import android.preference.Preference;
     28 import android.text.format.DateUtils;
     29 
     30 import com.android.settings.R;
     31 
     32 import android.text.format.Time;
     33 import android.util.Log;
     34 
     35 /**
     36  * BluetoothDiscoverableEnabler is a helper to manage the "Discoverable"
     37  * checkbox. It sets/unsets discoverability and keeps track of how much time
     38  * until the the discoverability is automatically turned off.
     39  */
     40 final class BluetoothDiscoverableEnabler implements Preference.OnPreferenceClickListener {
     41 
     42     private static final String TAG = "BluetoothDiscoverableEnabler";
     43 
     44     private static final String SYSTEM_PROPERTY_DISCOVERABLE_TIMEOUT =
     45             "debug.bt.discoverable_time";
     46 
     47     private static final int DISCOVERABLE_TIMEOUT_TWO_MINUTES = 120;
     48     private static final int DISCOVERABLE_TIMEOUT_FIVE_MINUTES = 300;
     49     private static final int DISCOVERABLE_TIMEOUT_ONE_HOUR = 3600;
     50     static final int DISCOVERABLE_TIMEOUT_NEVER = 0;
     51 
     52     // Bluetooth advanced settings screen was replaced with action bar items.
     53     // Use the same preference key for discoverable timeout as the old ListPreference.
     54     private static final String KEY_DISCOVERABLE_TIMEOUT = "bt_discoverable_timeout";
     55 
     56     private static final String VALUE_DISCOVERABLE_TIMEOUT_TWO_MINUTES = "twomin";
     57     private static final String VALUE_DISCOVERABLE_TIMEOUT_FIVE_MINUTES = "fivemin";
     58     private static final String VALUE_DISCOVERABLE_TIMEOUT_ONE_HOUR = "onehour";
     59     private static final String VALUE_DISCOVERABLE_TIMEOUT_NEVER = "never";
     60 
     61     static final int DEFAULT_DISCOVERABLE_TIMEOUT = DISCOVERABLE_TIMEOUT_TWO_MINUTES;
     62 
     63     private final Context mContext;
     64     private final Handler mUiHandler;
     65     private final Preference mDiscoveryPreference;
     66 
     67     private final LocalBluetoothAdapter mLocalAdapter;
     68 
     69     private final SharedPreferences mSharedPreferences;
     70 
     71     private boolean mDiscoverable;
     72     private int mNumberOfPairedDevices;
     73 
     74     private int mTimeoutSecs = -1;
     75 
     76     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     77         @Override
     78         public void onReceive(Context context, Intent intent) {
     79             if (BluetoothAdapter.ACTION_SCAN_MODE_CHANGED.equals(intent.getAction())) {
     80                 int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE,
     81                         BluetoothAdapter.ERROR);
     82                 if (mode != BluetoothAdapter.ERROR) {
     83                     handleModeChanged(mode);
     84                 }
     85             }
     86         }
     87     };
     88 
     89     private final Runnable mUpdateCountdownSummaryRunnable = new Runnable() {
     90         public void run() {
     91             updateCountdownSummary();
     92         }
     93     };
     94 
     95     BluetoothDiscoverableEnabler(Context context, LocalBluetoothAdapter adapter,
     96             Preference discoveryPreference) {
     97         mContext = context;
     98         mUiHandler = new Handler();
     99         mLocalAdapter = adapter;
    100         mDiscoveryPreference = discoveryPreference;
    101         mSharedPreferences = discoveryPreference.getSharedPreferences();
    102         discoveryPreference.setPersistent(false);
    103     }
    104 
    105     public void resume() {
    106         if (mLocalAdapter == null) {
    107             return;
    108         }
    109 
    110         IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
    111         mContext.registerReceiver(mReceiver, filter);
    112         mDiscoveryPreference.setOnPreferenceClickListener(this);
    113         handleModeChanged(mLocalAdapter.getScanMode());
    114     }
    115 
    116     public void pause() {
    117         if (mLocalAdapter == null) {
    118             return;
    119         }
    120 
    121         mUiHandler.removeCallbacks(mUpdateCountdownSummaryRunnable);
    122         mContext.unregisterReceiver(mReceiver);
    123         mDiscoveryPreference.setOnPreferenceClickListener(null);
    124     }
    125 
    126     public boolean onPreferenceClick(Preference preference) {
    127         // toggle discoverability
    128         mDiscoverable = !mDiscoverable;
    129         setEnabled(mDiscoverable);
    130         return true;
    131     }
    132 
    133     private void setEnabled(boolean enable) {
    134         if (enable) {
    135             int timeout = getDiscoverableTimeout();
    136             long endTimestamp = System.currentTimeMillis() + timeout * 1000L;
    137             LocalBluetoothPreferences.persistDiscoverableEndTimestamp(mContext, endTimestamp);
    138 
    139             mLocalAdapter.setScanMode(BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE, timeout);
    140             updateCountdownSummary();
    141 
    142             Log.d(TAG, "setEnabled(): enabled = " + enable + "timeout = " + timeout);
    143 
    144             if (timeout > 0) {
    145                 BluetoothDiscoverableTimeoutReceiver.setDiscoverableAlarm(mContext, endTimestamp);
    146             }
    147         } else {
    148             mLocalAdapter.setScanMode(BluetoothAdapter.SCAN_MODE_CONNECTABLE);
    149             BluetoothDiscoverableTimeoutReceiver.cancelDiscoverableAlarm(mContext);
    150         }
    151     }
    152 
    153     private void updateTimerDisplay(int timeout) {
    154         if (getDiscoverableTimeout() == DISCOVERABLE_TIMEOUT_NEVER) {
    155             mDiscoveryPreference.setSummary(R.string.bluetooth_is_discoverable_always);
    156         } else {
    157             String textTimeout = formatTimeRemaining(timeout);
    158             mDiscoveryPreference.setSummary(mContext.getString(R.string.bluetooth_is_discoverable,
    159                     textTimeout));
    160         }
    161     }
    162 
    163     private static String formatTimeRemaining(int timeout) {
    164         StringBuilder sb = new StringBuilder(6);    // "mmm:ss"
    165         int min = timeout / 60;
    166         sb.append(min).append(':');
    167         int sec = timeout - (min * 60);
    168         if (sec < 10) {
    169             sb.append('0');
    170         }
    171         sb.append(sec);
    172         return sb.toString();
    173     }
    174 
    175     void setDiscoverableTimeout(int index) {
    176         String timeoutValue;
    177         switch (index) {
    178             case 0:
    179             default:
    180                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_TWO_MINUTES;
    181                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_TWO_MINUTES;
    182                 break;
    183 
    184             case 1:
    185                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_FIVE_MINUTES;
    186                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_FIVE_MINUTES;
    187                 break;
    188 
    189             case 2:
    190                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_ONE_HOUR;
    191                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_ONE_HOUR;
    192                 break;
    193 
    194             case 3:
    195                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_NEVER;
    196                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_NEVER;
    197                 break;
    198         }
    199         mSharedPreferences.edit().putString(KEY_DISCOVERABLE_TIMEOUT, timeoutValue).apply();
    200         setEnabled(true);   // enable discovery and reset timer
    201     }
    202 
    203     private int getDiscoverableTimeout() {
    204         if (mTimeoutSecs != -1) {
    205             return mTimeoutSecs;
    206         }
    207 
    208         int timeout = SystemProperties.getInt(SYSTEM_PROPERTY_DISCOVERABLE_TIMEOUT, -1);
    209         if (timeout < 0) {
    210             String timeoutValue = mSharedPreferences.getString(KEY_DISCOVERABLE_TIMEOUT,
    211                     VALUE_DISCOVERABLE_TIMEOUT_TWO_MINUTES);
    212 
    213             if (timeoutValue.equals(VALUE_DISCOVERABLE_TIMEOUT_NEVER)) {
    214                 timeout = DISCOVERABLE_TIMEOUT_NEVER;
    215             } else if (timeoutValue.equals(VALUE_DISCOVERABLE_TIMEOUT_ONE_HOUR)) {
    216                 timeout = DISCOVERABLE_TIMEOUT_ONE_HOUR;
    217             } else if (timeoutValue.equals(VALUE_DISCOVERABLE_TIMEOUT_FIVE_MINUTES)) {
    218                 timeout = DISCOVERABLE_TIMEOUT_FIVE_MINUTES;
    219             } else {
    220                 timeout = DISCOVERABLE_TIMEOUT_TWO_MINUTES;
    221             }
    222         }
    223         mTimeoutSecs = timeout;
    224         return timeout;
    225     }
    226 
    227     int getDiscoverableTimeoutIndex() {
    228         int timeout = getDiscoverableTimeout();
    229         switch (timeout) {
    230             case DISCOVERABLE_TIMEOUT_TWO_MINUTES:
    231             default:
    232                 return 0;
    233 
    234             case DISCOVERABLE_TIMEOUT_FIVE_MINUTES:
    235                 return 1;
    236 
    237             case DISCOVERABLE_TIMEOUT_ONE_HOUR:
    238                 return 2;
    239 
    240             case DISCOVERABLE_TIMEOUT_NEVER:
    241                 return 3;
    242         }
    243     }
    244 
    245     void setNumberOfPairedDevices(int pairedDevices) {
    246         mNumberOfPairedDevices = pairedDevices;
    247         handleModeChanged(mLocalAdapter.getScanMode());
    248     }
    249 
    250     void handleModeChanged(int mode) {
    251         Log.d(TAG, "handleModeChanged(): mode = " + mode);
    252         if (mode == BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
    253             mDiscoverable = true;
    254             updateCountdownSummary();
    255         } else {
    256             mDiscoverable = false;
    257             setSummaryNotDiscoverable();
    258         }
    259     }
    260 
    261     private void setSummaryNotDiscoverable() {
    262         if (mNumberOfPairedDevices != 0) {
    263             mDiscoveryPreference.setSummary(R.string.bluetooth_only_visible_to_paired_devices);
    264         } else {
    265             mDiscoveryPreference.setSummary(R.string.bluetooth_not_visible_to_other_devices);
    266         }
    267     }
    268 
    269     private void updateCountdownSummary() {
    270         int mode = mLocalAdapter.getScanMode();
    271         if (mode != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
    272             return;
    273         }
    274 
    275         long currentTimestamp = System.currentTimeMillis();
    276         long endTimestamp = LocalBluetoothPreferences.getDiscoverableEndTimestamp(mContext);
    277 
    278         if (currentTimestamp > endTimestamp) {
    279             // We're still in discoverable mode, but maybe there isn't a timeout.
    280             updateTimerDisplay(0);
    281             return;
    282         }
    283 
    284         int timeLeft = (int) ((endTimestamp - currentTimestamp) / 1000L);
    285         updateTimerDisplay(timeLeft);
    286 
    287         synchronized (this) {
    288             mUiHandler.removeCallbacks(mUpdateCountdownSummaryRunnable);
    289             mUiHandler.postDelayed(mUpdateCountdownSummaryRunnable, 1000);
    290         }
    291     }
    292 }
    293