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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.support.v7.preference.Preference;
     28 import android.util.Log;
     29 
     30 import com.android.settings.R;
     31 import com.android.settingslib.bluetooth.BluetoothDiscoverableTimeoutReceiver;
     32 import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
     33 
     34 /**
     35  * BluetoothDiscoverableEnabler is a helper to manage the "Discoverable"
     36  * checkbox. It sets/unsets discoverability and keeps track of how much time
     37  * until the the discoverability is automatically turned off.
     38  */
     39 final class BluetoothDiscoverableEnabler implements Preference.OnPreferenceClickListener {
     40 
     41     private static final String TAG = "BluetoothDiscoverableEnabler";
     42 
     43     private static final String SYSTEM_PROPERTY_DISCOVERABLE_TIMEOUT =
     44             "debug.bt.discoverable_time";
     45 
     46     private static final int DISCOVERABLE_TIMEOUT_TWO_MINUTES = 120;
     47     private static final int DISCOVERABLE_TIMEOUT_FIVE_MINUTES = 300;
     48     private static final int DISCOVERABLE_TIMEOUT_ONE_HOUR = 3600;
     49     static final int DISCOVERABLE_TIMEOUT_NEVER = 0;
     50 
     51     // Bluetooth advanced settings screen was replaced with action bar items.
     52     // Use the same preference key for discoverable timeout as the old ListPreference.
     53     private static final String KEY_DISCOVERABLE_TIMEOUT = "bt_discoverable_timeout";
     54 
     55     private static final String VALUE_DISCOVERABLE_TIMEOUT_TWO_MINUTES = "twomin";
     56     private static final String VALUE_DISCOVERABLE_TIMEOUT_FIVE_MINUTES = "fivemin";
     57     private static final String VALUE_DISCOVERABLE_TIMEOUT_ONE_HOUR = "onehour";
     58     private static final String VALUE_DISCOVERABLE_TIMEOUT_NEVER = "never";
     59 
     60     static final int DEFAULT_DISCOVERABLE_TIMEOUT = DISCOVERABLE_TIMEOUT_TWO_MINUTES;
     61 
     62     private Context mContext;
     63     private final Handler mUiHandler;
     64     private final Preference mDiscoveryPreference;
     65 
     66     private final LocalBluetoothAdapter mLocalAdapter;
     67 
     68     private final SharedPreferences mSharedPreferences;
     69 
     70     private boolean mDiscoverable;
     71     private int mNumberOfPairedDevices;
     72 
     73     private int mTimeoutSecs = -1;
     74 
     75     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     76         @Override
     77         public void onReceive(Context context, Intent intent) {
     78             if (BluetoothAdapter.ACTION_SCAN_MODE_CHANGED.equals(intent.getAction())) {
     79                 int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE,
     80                         BluetoothAdapter.ERROR);
     81                 if (mode != BluetoothAdapter.ERROR) {
     82                     handleModeChanged(mode);
     83                 }
     84             }
     85         }
     86     };
     87 
     88     private final Runnable mUpdateCountdownSummaryRunnable = new Runnable() {
     89         public void run() {
     90             updateCountdownSummary();
     91         }
     92     };
     93 
     94     BluetoothDiscoverableEnabler(LocalBluetoothAdapter adapter,
     95             Preference discoveryPreference) {
     96         mUiHandler = new Handler();
     97         mLocalAdapter = adapter;
     98         mDiscoveryPreference = discoveryPreference;
     99         mSharedPreferences = discoveryPreference.getSharedPreferences();
    100         discoveryPreference.setPersistent(false);
    101     }
    102 
    103     public void resume(Context context) {
    104         if (mLocalAdapter == null) {
    105             return;
    106         }
    107 
    108         if (mContext != context) {
    109             mContext = context;
    110         }
    111 
    112         IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
    113         mContext.registerReceiver(mReceiver, filter);
    114         mDiscoveryPreference.setOnPreferenceClickListener(this);
    115         handleModeChanged(mLocalAdapter.getScanMode());
    116     }
    117 
    118     public void pause() {
    119         if (mLocalAdapter == null) {
    120             return;
    121         }
    122 
    123         mUiHandler.removeCallbacks(mUpdateCountdownSummaryRunnable);
    124         mContext.unregisterReceiver(mReceiver);
    125         mDiscoveryPreference.setOnPreferenceClickListener(null);
    126     }
    127 
    128     public boolean onPreferenceClick(Preference preference) {
    129         // toggle discoverability
    130         mDiscoverable = !mDiscoverable;
    131         setEnabled(mDiscoverable);
    132         return true;
    133     }
    134 
    135     private void setEnabled(boolean enable) {
    136         if (enable) {
    137             int timeout = getDiscoverableTimeout();
    138             long endTimestamp = System.currentTimeMillis() + timeout * 1000L;
    139             LocalBluetoothPreferences.persistDiscoverableEndTimestamp(mContext, endTimestamp);
    140 
    141             mLocalAdapter.setScanMode(BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE, timeout);
    142             updateCountdownSummary();
    143 
    144             Log.d(TAG, "setEnabled(): enabled = " + enable + "timeout = " + timeout);
    145 
    146             if (timeout > 0) {
    147                 BluetoothDiscoverableTimeoutReceiver.setDiscoverableAlarm(mContext, endTimestamp);
    148             } else {
    149                 BluetoothDiscoverableTimeoutReceiver.cancelDiscoverableAlarm(mContext);
    150             }
    151 
    152         } else {
    153             mLocalAdapter.setScanMode(BluetoothAdapter.SCAN_MODE_CONNECTABLE);
    154             BluetoothDiscoverableTimeoutReceiver.cancelDiscoverableAlarm(mContext);
    155         }
    156     }
    157 
    158     private void updateTimerDisplay(int timeout) {
    159         if (getDiscoverableTimeout() == DISCOVERABLE_TIMEOUT_NEVER) {
    160             mDiscoveryPreference.setSummary(R.string.bluetooth_is_discoverable_always);
    161         } else {
    162             String textTimeout = formatTimeRemaining(timeout);
    163             mDiscoveryPreference.setSummary(mContext.getString(R.string.bluetooth_is_discoverable,
    164                     textTimeout));
    165         }
    166     }
    167 
    168     private static String formatTimeRemaining(int timeout) {
    169         StringBuilder sb = new StringBuilder(6);    // "mmm:ss"
    170         int min = timeout / 60;
    171         sb.append(min).append(':');
    172         int sec = timeout - (min * 60);
    173         if (sec < 10) {
    174             sb.append('0');
    175         }
    176         sb.append(sec);
    177         return sb.toString();
    178     }
    179 
    180     void setDiscoverableTimeout(int index) {
    181         String timeoutValue;
    182         switch (index) {
    183             case 0:
    184             default:
    185                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_TWO_MINUTES;
    186                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_TWO_MINUTES;
    187                 break;
    188 
    189             case 1:
    190                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_FIVE_MINUTES;
    191                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_FIVE_MINUTES;
    192                 break;
    193 
    194             case 2:
    195                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_ONE_HOUR;
    196                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_ONE_HOUR;
    197                 break;
    198 
    199             case 3:
    200                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_NEVER;
    201                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_NEVER;
    202                 break;
    203         }
    204         mSharedPreferences.edit().putString(KEY_DISCOVERABLE_TIMEOUT, timeoutValue).apply();
    205         setEnabled(true);   // enable discovery and reset timer
    206     }
    207 
    208     private int getDiscoverableTimeout() {
    209         if (mTimeoutSecs != -1) {
    210             return mTimeoutSecs;
    211         }
    212 
    213         int timeout = SystemProperties.getInt(SYSTEM_PROPERTY_DISCOVERABLE_TIMEOUT, -1);
    214         if (timeout < 0) {
    215             String timeoutValue = mSharedPreferences.getString(KEY_DISCOVERABLE_TIMEOUT,
    216                     VALUE_DISCOVERABLE_TIMEOUT_TWO_MINUTES);
    217 
    218             if (timeoutValue.equals(VALUE_DISCOVERABLE_TIMEOUT_NEVER)) {
    219                 timeout = DISCOVERABLE_TIMEOUT_NEVER;
    220             } else if (timeoutValue.equals(VALUE_DISCOVERABLE_TIMEOUT_ONE_HOUR)) {
    221                 timeout = DISCOVERABLE_TIMEOUT_ONE_HOUR;
    222             } else if (timeoutValue.equals(VALUE_DISCOVERABLE_TIMEOUT_FIVE_MINUTES)) {
    223                 timeout = DISCOVERABLE_TIMEOUT_FIVE_MINUTES;
    224             } else {
    225                 timeout = DISCOVERABLE_TIMEOUT_TWO_MINUTES;
    226             }
    227         }
    228         mTimeoutSecs = timeout;
    229         return timeout;
    230     }
    231 
    232     int getDiscoverableTimeoutIndex() {
    233         int timeout = getDiscoverableTimeout();
    234         switch (timeout) {
    235             case DISCOVERABLE_TIMEOUT_TWO_MINUTES:
    236             default:
    237                 return 0;
    238 
    239             case DISCOVERABLE_TIMEOUT_FIVE_MINUTES:
    240                 return 1;
    241 
    242             case DISCOVERABLE_TIMEOUT_ONE_HOUR:
    243                 return 2;
    244 
    245             case DISCOVERABLE_TIMEOUT_NEVER:
    246                 return 3;
    247         }
    248     }
    249 
    250     void setNumberOfPairedDevices(int pairedDevices) {
    251         mNumberOfPairedDevices = pairedDevices;
    252         handleModeChanged(mLocalAdapter.getScanMode());
    253     }
    254 
    255     void handleModeChanged(int mode) {
    256         Log.d(TAG, "handleModeChanged(): mode = " + mode);
    257         if (mode == BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
    258             mDiscoverable = true;
    259             updateCountdownSummary();
    260         } else {
    261             mDiscoverable = false;
    262             setSummaryNotDiscoverable();
    263         }
    264     }
    265 
    266     private void setSummaryNotDiscoverable() {
    267         if (mNumberOfPairedDevices != 0) {
    268             mDiscoveryPreference.setSummary(R.string.bluetooth_only_visible_to_paired_devices);
    269         } else {
    270             mDiscoveryPreference.setSummary(R.string.bluetooth_not_visible_to_other_devices);
    271         }
    272     }
    273 
    274     private void updateCountdownSummary() {
    275         int mode = mLocalAdapter.getScanMode();
    276         if (mode != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
    277             return;
    278         }
    279 
    280         long currentTimestamp = System.currentTimeMillis();
    281         long endTimestamp = LocalBluetoothPreferences.getDiscoverableEndTimestamp(mContext);
    282 
    283         if (currentTimestamp > endTimestamp) {
    284             // We're still in discoverable mode, but maybe there isn't a timeout.
    285             updateTimerDisplay(0);
    286             return;
    287         }
    288 
    289         int timeLeft = (int) ((endTimestamp - currentTimestamp) / 1000L);
    290         updateTimerDisplay(timeLeft);
    291 
    292         synchronized (this) {
    293             mUiHandler.removeCallbacks(mUpdateCountdownSummaryRunnable);
    294             mUiHandler.postDelayed(mUpdateCountdownSummaryRunnable, 1000);
    295         }
    296     }
    297 }
    298