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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 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(LocalBluetoothAdapter adapter,
     96             Preference discoveryPreference) {
     97         mUiHandler = new Handler();
     98         mLocalAdapter = adapter;
     99         mDiscoveryPreference = discoveryPreference;
    100         mSharedPreferences = discoveryPreference.getSharedPreferences();
    101         discoveryPreference.setPersistent(false);
    102     }
    103 
    104     public void resume(Context context) {
    105         if (mLocalAdapter == null) {
    106             return;
    107         }
    108 
    109         if (mContext != context) {
    110             mContext = context;
    111         }
    112 
    113         IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
    114         mContext.registerReceiver(mReceiver, filter);
    115         mDiscoveryPreference.setOnPreferenceClickListener(this);
    116         handleModeChanged(mLocalAdapter.getScanMode());
    117     }
    118 
    119     public void pause() {
    120         if (mLocalAdapter == null) {
    121             return;
    122         }
    123 
    124         mUiHandler.removeCallbacks(mUpdateCountdownSummaryRunnable);
    125         mContext.unregisterReceiver(mReceiver);
    126         mDiscoveryPreference.setOnPreferenceClickListener(null);
    127     }
    128 
    129     public boolean onPreferenceClick(Preference preference) {
    130         // toggle discoverability
    131         mDiscoverable = !mDiscoverable;
    132         setEnabled(mDiscoverable);
    133         return true;
    134     }
    135 
    136     private void setEnabled(boolean enable) {
    137         if (enable) {
    138             int timeout = getDiscoverableTimeout();
    139             long endTimestamp = System.currentTimeMillis() + timeout * 1000L;
    140             LocalBluetoothPreferences.persistDiscoverableEndTimestamp(mContext, endTimestamp);
    141 
    142             mLocalAdapter.setScanMode(BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE, timeout);
    143             updateCountdownSummary();
    144 
    145             Log.d(TAG, "setEnabled(): enabled = " + enable + "timeout = " + timeout);
    146 
    147             if (timeout > 0) {
    148                 BluetoothDiscoverableTimeoutReceiver.setDiscoverableAlarm(mContext, endTimestamp);
    149             } else {
    150                 BluetoothDiscoverableTimeoutReceiver.cancelDiscoverableAlarm(mContext);
    151             }
    152 
    153         } else {
    154             mLocalAdapter.setScanMode(BluetoothAdapter.SCAN_MODE_CONNECTABLE);
    155             BluetoothDiscoverableTimeoutReceiver.cancelDiscoverableAlarm(mContext);
    156         }
    157     }
    158 
    159     private void updateTimerDisplay(int timeout) {
    160         if (getDiscoverableTimeout() == DISCOVERABLE_TIMEOUT_NEVER) {
    161             mDiscoveryPreference.setSummary(R.string.bluetooth_is_discoverable_always);
    162         } else {
    163             String textTimeout = formatTimeRemaining(timeout);
    164             mDiscoveryPreference.setSummary(mContext.getString(R.string.bluetooth_is_discoverable,
    165                     textTimeout));
    166         }
    167     }
    168 
    169     private static String formatTimeRemaining(int timeout) {
    170         StringBuilder sb = new StringBuilder(6);    // "mmm:ss"
    171         int min = timeout / 60;
    172         sb.append(min).append(':');
    173         int sec = timeout - (min * 60);
    174         if (sec < 10) {
    175             sb.append('0');
    176         }
    177         sb.append(sec);
    178         return sb.toString();
    179     }
    180 
    181     void setDiscoverableTimeout(int index) {
    182         String timeoutValue;
    183         switch (index) {
    184             case 0:
    185             default:
    186                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_TWO_MINUTES;
    187                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_TWO_MINUTES;
    188                 break;
    189 
    190             case 1:
    191                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_FIVE_MINUTES;
    192                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_FIVE_MINUTES;
    193                 break;
    194 
    195             case 2:
    196                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_ONE_HOUR;
    197                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_ONE_HOUR;
    198                 break;
    199 
    200             case 3:
    201                 mTimeoutSecs = DISCOVERABLE_TIMEOUT_NEVER;
    202                 timeoutValue = VALUE_DISCOVERABLE_TIMEOUT_NEVER;
    203                 break;
    204         }
    205         mSharedPreferences.edit().putString(KEY_DISCOVERABLE_TIMEOUT, timeoutValue).apply();
    206         setEnabled(true);   // enable discovery and reset timer
    207     }
    208 
    209     private int getDiscoverableTimeout() {
    210         if (mTimeoutSecs != -1) {
    211             return mTimeoutSecs;
    212         }
    213 
    214         int timeout = SystemProperties.getInt(SYSTEM_PROPERTY_DISCOVERABLE_TIMEOUT, -1);
    215         if (timeout < 0) {
    216             String timeoutValue = mSharedPreferences.getString(KEY_DISCOVERABLE_TIMEOUT,
    217                     VALUE_DISCOVERABLE_TIMEOUT_TWO_MINUTES);
    218 
    219             if (timeoutValue.equals(VALUE_DISCOVERABLE_TIMEOUT_NEVER)) {
    220                 timeout = DISCOVERABLE_TIMEOUT_NEVER;
    221             } else if (timeoutValue.equals(VALUE_DISCOVERABLE_TIMEOUT_ONE_HOUR)) {
    222                 timeout = DISCOVERABLE_TIMEOUT_ONE_HOUR;
    223             } else if (timeoutValue.equals(VALUE_DISCOVERABLE_TIMEOUT_FIVE_MINUTES)) {
    224                 timeout = DISCOVERABLE_TIMEOUT_FIVE_MINUTES;
    225             } else {
    226                 timeout = DISCOVERABLE_TIMEOUT_TWO_MINUTES;
    227             }
    228         }
    229         mTimeoutSecs = timeout;
    230         return timeout;
    231     }
    232 
    233     int getDiscoverableTimeoutIndex() {
    234         int timeout = getDiscoverableTimeout();
    235         switch (timeout) {
    236             case DISCOVERABLE_TIMEOUT_TWO_MINUTES:
    237             default:
    238                 return 0;
    239 
    240             case DISCOVERABLE_TIMEOUT_FIVE_MINUTES:
    241                 return 1;
    242 
    243             case DISCOVERABLE_TIMEOUT_ONE_HOUR:
    244                 return 2;
    245 
    246             case DISCOVERABLE_TIMEOUT_NEVER:
    247                 return 3;
    248         }
    249     }
    250 
    251     void setNumberOfPairedDevices(int pairedDevices) {
    252         mNumberOfPairedDevices = pairedDevices;
    253         handleModeChanged(mLocalAdapter.getScanMode());
    254     }
    255 
    256     void handleModeChanged(int mode) {
    257         Log.d(TAG, "handleModeChanged(): mode = " + mode);
    258         if (mode == BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
    259             mDiscoverable = true;
    260             updateCountdownSummary();
    261         } else {
    262             mDiscoverable = false;
    263             setSummaryNotDiscoverable();
    264         }
    265     }
    266 
    267     private void setSummaryNotDiscoverable() {
    268         if (mNumberOfPairedDevices != 0) {
    269             mDiscoveryPreference.setSummary(R.string.bluetooth_only_visible_to_paired_devices);
    270         } else {
    271             mDiscoveryPreference.setSummary(R.string.bluetooth_not_visible_to_other_devices);
    272         }
    273     }
    274 
    275     private void updateCountdownSummary() {
    276         int mode = mLocalAdapter.getScanMode();
    277         if (mode != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
    278             return;
    279         }
    280 
    281         long currentTimestamp = System.currentTimeMillis();
    282         long endTimestamp = LocalBluetoothPreferences.getDiscoverableEndTimestamp(mContext);
    283 
    284         if (currentTimestamp > endTimestamp) {
    285             // We're still in discoverable mode, but maybe there isn't a timeout.
    286             updateTimerDisplay(0);
    287             return;
    288         }
    289 
    290         int timeLeft = (int) ((endTimestamp - currentTimestamp) / 1000L);
    291         updateTimerDisplay(timeLeft);
    292 
    293         synchronized (this) {
    294             mUiHandler.removeCallbacks(mUpdateCountdownSummaryRunnable);
    295             mUiHandler.postDelayed(mUpdateCountdownSummaryRunnable, 1000);
    296         }
    297     }
    298 }
    299