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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.util.Log;
     28 import android.widget.Switch;
     29 import android.widget.Toast;
     30 
     31 import com.android.internal.logging.MetricsLogger;
     32 import com.android.internal.logging.MetricsProto.MetricsEvent;
     33 import com.android.settings.R;
     34 import com.android.settings.search.Index;
     35 import com.android.settings.widget.SwitchBar;
     36 import com.android.settingslib.WirelessUtils;
     37 import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
     38 import com.android.settingslib.bluetooth.LocalBluetoothManager;
     39 
     40 /**
     41  * BluetoothEnabler is a helper to manage the Bluetooth on/off checkbox
     42  * preference. It turns on/off Bluetooth and ensures the summary of the
     43  * preference reflects the current state.
     44  */
     45 public final class BluetoothEnabler implements SwitchBar.OnSwitchChangeListener {
     46     private Context mContext;
     47     private Switch mSwitch;
     48     private SwitchBar mSwitchBar;
     49     private boolean mValidListener;
     50     private final LocalBluetoothAdapter mLocalAdapter;
     51     private final IntentFilter mIntentFilter;
     52 
     53     private static final String EVENT_DATA_IS_BT_ON = "is_bluetooth_on";
     54     private static final int EVENT_UPDATE_INDEX = 0;
     55 
     56     private Handler mHandler = new Handler() {
     57         @Override
     58         public void handleMessage(Message msg) {
     59             switch (msg.what) {
     60                 case EVENT_UPDATE_INDEX:
     61                     final boolean isBluetoothOn = msg.getData().getBoolean(EVENT_DATA_IS_BT_ON);
     62                     Index.getInstance(mContext).updateFromClassNameResource(
     63                             BluetoothSettings.class.getName(), true, isBluetoothOn);
     64                     break;
     65             }
     66         }
     67     };
     68 
     69     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     70         @Override
     71         public void onReceive(Context context, Intent intent) {
     72             // Broadcast receiver is always running on the UI thread here,
     73             // so we don't need consider thread synchronization.
     74             int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
     75             handleStateChanged(state);
     76         }
     77     };
     78 
     79     public BluetoothEnabler(Context context, SwitchBar switchBar) {
     80         mContext = context;
     81         mSwitchBar = switchBar;
     82         mSwitch = switchBar.getSwitch();
     83         mValidListener = false;
     84 
     85         LocalBluetoothManager manager = Utils.getLocalBtManager(context);
     86         if (manager == null) {
     87             // Bluetooth is not supported
     88             mLocalAdapter = null;
     89             mSwitch.setEnabled(false);
     90         } else {
     91             mLocalAdapter = manager.getBluetoothAdapter();
     92         }
     93         mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
     94     }
     95 
     96     public void setupSwitchBar() {
     97         mSwitchBar.show();
     98     }
     99 
    100     public void teardownSwitchBar() {
    101         mSwitchBar.hide();
    102     }
    103 
    104     public void resume(Context context) {
    105         if (mLocalAdapter == null) {
    106             mSwitch.setEnabled(false);
    107             return;
    108         }
    109 
    110         if (mContext != context) {
    111             mContext = context;
    112         }
    113 
    114         // Bluetooth state is not sticky, so set it manually
    115         handleStateChanged(mLocalAdapter.getBluetoothState());
    116 
    117         mSwitchBar.addOnSwitchChangeListener(this);
    118         mContext.registerReceiver(mReceiver, mIntentFilter);
    119         mValidListener = true;
    120     }
    121 
    122     public void pause() {
    123         if (mLocalAdapter == null) {
    124             return;
    125         }
    126 
    127         mSwitchBar.removeOnSwitchChangeListener(this);
    128         mContext.unregisterReceiver(mReceiver);
    129         mValidListener = false;
    130     }
    131 
    132     void handleStateChanged(int state) {
    133         switch (state) {
    134             case BluetoothAdapter.STATE_TURNING_ON:
    135                 mSwitch.setEnabled(false);
    136                 break;
    137             case BluetoothAdapter.STATE_ON:
    138                 setChecked(true);
    139                 mSwitch.setEnabled(true);
    140                 updateSearchIndex(true);
    141                 break;
    142             case BluetoothAdapter.STATE_TURNING_OFF:
    143                 mSwitch.setEnabled(false);
    144                 break;
    145             case BluetoothAdapter.STATE_OFF:
    146                 setChecked(false);
    147                 mSwitch.setEnabled(true);
    148                 updateSearchIndex(false);
    149                 break;
    150             default:
    151                 setChecked(false);
    152                 mSwitch.setEnabled(true);
    153                 updateSearchIndex(false);
    154         }
    155     }
    156 
    157     private void setChecked(boolean isChecked) {
    158         if (isChecked != mSwitch.isChecked()) {
    159             // set listener to null, so onCheckedChanged won't be called
    160             // if the checked status on Switch isn't changed by user click
    161             if (mValidListener) {
    162                 mSwitchBar.removeOnSwitchChangeListener(this);
    163             }
    164             mSwitch.setChecked(isChecked);
    165             if (mValidListener) {
    166                 mSwitchBar.addOnSwitchChangeListener(this);
    167             }
    168         }
    169     }
    170 
    171     private void updateSearchIndex(boolean isBluetoothOn) {
    172         mHandler.removeMessages(EVENT_UPDATE_INDEX);
    173 
    174         Message msg = new Message();
    175         msg.what = EVENT_UPDATE_INDEX;
    176         msg.getData().putBoolean(EVENT_DATA_IS_BT_ON, isBluetoothOn);
    177         mHandler.sendMessage(msg);
    178     }
    179 
    180     @Override
    181     public void onSwitchChanged(Switch switchView, boolean isChecked) {
    182         // Show toast message if Bluetooth is not allowed in airplane mode
    183         if (isChecked &&
    184                 !WirelessUtils.isRadioAllowed(mContext, Settings.Global.RADIO_BLUETOOTH)) {
    185             Toast.makeText(mContext, R.string.wifi_in_airplane_mode, Toast.LENGTH_SHORT).show();
    186             // Reset switch to off
    187             switchView.setChecked(false);
    188         }
    189 
    190         MetricsLogger.action(mContext, MetricsEvent.ACTION_BLUETOOTH_TOGGLE, isChecked);
    191 
    192         if (mLocalAdapter != null) {
    193             boolean status = mLocalAdapter.setBluetoothEnabled(isChecked);
    194             // If we cannot toggle it ON then reset the UI assets:
    195             // a) The switch should be OFF but it should still be togglable (enabled = True)
    196             // b) The switch bar should have OFF text.
    197             if (isChecked && !status) {
    198                 switchView.setChecked(false);
    199                 mSwitch.setEnabled(true);
    200                 mSwitchBar.setTextViewLabel(false);
    201                 return;
    202             }
    203         }
    204         mSwitch.setEnabled(false);
    205     }
    206 }
    207