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      1 /*
      2  * Copyright (C) 2010 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.os.Handler;
     25 import android.os.Message;
     26 import android.provider.Settings;
     27 import android.widget.CompoundButton;
     28 import android.widget.Switch;
     29 import android.widget.Toast;
     30 
     31 import com.android.settings.R;
     32 import com.android.settings.WirelessSettings;
     33 import com.android.settings.search.Index;
     34 import com.android.settings.widget.SwitchBar;
     35 
     36 /**
     37  * BluetoothEnabler is a helper to manage the Bluetooth on/off checkbox
     38  * preference. It turns on/off Bluetooth and ensures the summary of the
     39  * preference reflects the current state.
     40  */
     41 public final class BluetoothEnabler implements SwitchBar.OnSwitchChangeListener {
     42     private Context mContext;
     43     private Switch mSwitch;
     44     private SwitchBar mSwitchBar;
     45     private boolean mValidListener;
     46     private final LocalBluetoothAdapter mLocalAdapter;
     47     private final IntentFilter mIntentFilter;
     48 
     49     private static final String EVENT_DATA_IS_BT_ON = "is_bluetooth_on";
     50     private static final int EVENT_UPDATE_INDEX = 0;
     51 
     52     private Handler mHandler = new Handler() {
     53         @Override
     54         public void handleMessage(Message msg) {
     55             switch (msg.what) {
     56                 case EVENT_UPDATE_INDEX:
     57                     final boolean isBluetoothOn = msg.getData().getBoolean(EVENT_DATA_IS_BT_ON);
     58                     Index.getInstance(mContext).updateFromClassNameResource(
     59                             BluetoothSettings.class.getName(), true, isBluetoothOn);
     60                     break;
     61             }
     62         }
     63     };
     64 
     65     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     66         @Override
     67         public void onReceive(Context context, Intent intent) {
     68             // Broadcast receiver is always running on the UI thread here,
     69             // so we don't need consider thread synchronization.
     70             int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
     71             handleStateChanged(state);
     72         }
     73     };
     74 
     75     public BluetoothEnabler(Context context, SwitchBar switchBar) {
     76         mContext = context;
     77         mSwitchBar = switchBar;
     78         mSwitch = switchBar.getSwitch();
     79         mValidListener = false;
     80 
     81         LocalBluetoothManager manager = LocalBluetoothManager.getInstance(context);
     82         if (manager == null) {
     83             // Bluetooth is not supported
     84             mLocalAdapter = null;
     85             mSwitch.setEnabled(false);
     86         } else {
     87             mLocalAdapter = manager.getBluetoothAdapter();
     88         }
     89         mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
     90     }
     91 
     92     public void setupSwitchBar() {
     93         mSwitchBar.show();
     94     }
     95 
     96     public void teardownSwitchBar() {
     97         mSwitchBar.hide();
     98     }
     99 
    100     public void resume(Context context) {
    101         if (mLocalAdapter == null) {
    102             mSwitch.setEnabled(false);
    103             return;
    104         }
    105 
    106         if (mContext != context) {
    107             mContext = context;
    108         }
    109 
    110         // Bluetooth state is not sticky, so set it manually
    111         handleStateChanged(mLocalAdapter.getBluetoothState());
    112 
    113         mSwitchBar.addOnSwitchChangeListener(this);
    114         mContext.registerReceiver(mReceiver, mIntentFilter);
    115         mValidListener = true;
    116     }
    117 
    118     public void pause() {
    119         if (mLocalAdapter == null) {
    120             return;
    121         }
    122 
    123         mSwitchBar.removeOnSwitchChangeListener(this);
    124         mContext.unregisterReceiver(mReceiver);
    125         mValidListener = false;
    126     }
    127 
    128     void handleStateChanged(int state) {
    129         switch (state) {
    130             case BluetoothAdapter.STATE_TURNING_ON:
    131                 mSwitch.setEnabled(false);
    132                 break;
    133             case BluetoothAdapter.STATE_ON:
    134                 setChecked(true);
    135                 mSwitch.setEnabled(true);
    136                 updateSearchIndex(true);
    137                 break;
    138             case BluetoothAdapter.STATE_TURNING_OFF:
    139                 mSwitch.setEnabled(false);
    140                 break;
    141             case BluetoothAdapter.STATE_OFF:
    142                 setChecked(false);
    143                 mSwitch.setEnabled(true);
    144                 updateSearchIndex(false);
    145                 break;
    146             default:
    147                 setChecked(false);
    148                 mSwitch.setEnabled(true);
    149                 updateSearchIndex(false);
    150         }
    151     }
    152 
    153     private void setChecked(boolean isChecked) {
    154         if (isChecked != mSwitch.isChecked()) {
    155             // set listener to null, so onCheckedChanged won't be called
    156             // if the checked status on Switch isn't changed by user click
    157             if (mValidListener) {
    158                 mSwitchBar.removeOnSwitchChangeListener(this);
    159             }
    160             mSwitch.setChecked(isChecked);
    161             if (mValidListener) {
    162                 mSwitchBar.addOnSwitchChangeListener(this);
    163             }
    164         }
    165     }
    166 
    167     private void updateSearchIndex(boolean isBluetoothOn) {
    168         mHandler.removeMessages(EVENT_UPDATE_INDEX);
    169 
    170         Message msg = new Message();
    171         msg.what = EVENT_UPDATE_INDEX;
    172         msg.getData().putBoolean(EVENT_DATA_IS_BT_ON, isBluetoothOn);
    173         mHandler.sendMessage(msg);
    174     }
    175 
    176     @Override
    177     public void onSwitchChanged(Switch switchView, boolean isChecked) {
    178         // Show toast message if Bluetooth is not allowed in airplane mode
    179         if (isChecked &&
    180                 !WirelessSettings.isRadioAllowed(mContext, Settings.Global.RADIO_BLUETOOTH)) {
    181             Toast.makeText(mContext, R.string.wifi_in_airplane_mode, Toast.LENGTH_SHORT).show();
    182             // Reset switch to off
    183             switchView.setChecked(false);
    184         }
    185 
    186         if (mLocalAdapter != null) {
    187             mLocalAdapter.setBluetoothEnabled(isChecked);
    188         }
    189         mSwitch.setEnabled(false);
    190     }
    191 }
    192