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