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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.provider.Settings;
     25 import android.widget.CompoundButton;
     26 import android.widget.Switch;
     27 import android.widget.Toast;
     28 
     29 import com.android.settings.R;
     30 import com.android.settings.WirelessSettings;
     31 
     32 /**
     33  * BluetoothEnabler is a helper to manage the Bluetooth on/off checkbox
     34  * preference. It turns on/off Bluetooth and ensures the summary of the
     35  * preference reflects the current state.
     36  */
     37 public final class BluetoothEnabler implements CompoundButton.OnCheckedChangeListener {
     38     private final Context mContext;
     39     private Switch mSwitch;
     40     private boolean mValidListener;
     41     private final LocalBluetoothAdapter mLocalAdapter;
     42     private final IntentFilter mIntentFilter;
     43 
     44     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     45         @Override
     46         public void onReceive(Context context, Intent intent) {
     47             // Broadcast receiver is always running on the UI thread here,
     48             // so we don't need consider thread synchronization.
     49             int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
     50             handleStateChanged(state);
     51         }
     52     };
     53 
     54     public BluetoothEnabler(Context context, Switch switch_) {
     55         mContext = context;
     56         mSwitch = switch_;
     57         mValidListener = false;
     58 
     59         LocalBluetoothManager manager = LocalBluetoothManager.getInstance(context);
     60         if (manager == null) {
     61             // Bluetooth is not supported
     62             mLocalAdapter = null;
     63             mSwitch.setEnabled(false);
     64         } else {
     65             mLocalAdapter = manager.getBluetoothAdapter();
     66         }
     67         mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
     68     }
     69 
     70     public void resume() {
     71         if (mLocalAdapter == null) {
     72             mSwitch.setEnabled(false);
     73             return;
     74         }
     75 
     76         // Bluetooth state is not sticky, so set it manually
     77         handleStateChanged(mLocalAdapter.getBluetoothState());
     78 
     79         mContext.registerReceiver(mReceiver, mIntentFilter);
     80         mSwitch.setOnCheckedChangeListener(this);
     81         mValidListener = true;
     82     }
     83 
     84     public void pause() {
     85         if (mLocalAdapter == null) {
     86             return;
     87         }
     88 
     89         mContext.unregisterReceiver(mReceiver);
     90         mSwitch.setOnCheckedChangeListener(null);
     91         mValidListener = false;
     92     }
     93 
     94     public void setSwitch(Switch switch_) {
     95         if (mSwitch == switch_) return;
     96         mSwitch.setOnCheckedChangeListener(null);
     97         mSwitch = switch_;
     98         mSwitch.setOnCheckedChangeListener(mValidListener ? this : null);
     99 
    100         int bluetoothState = BluetoothAdapter.STATE_OFF;
    101         if (mLocalAdapter != null) bluetoothState = mLocalAdapter.getBluetoothState();
    102         boolean isOn = bluetoothState == BluetoothAdapter.STATE_ON;
    103         boolean isOff = bluetoothState == BluetoothAdapter.STATE_OFF;
    104         setChecked(isOn);
    105         mSwitch.setEnabled(isOn || isOff);
    106     }
    107 
    108     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    109         // Show toast message if Bluetooth is not allowed in airplane mode
    110         if (isChecked &&
    111                 !WirelessSettings.isRadioAllowed(mContext, Settings.Global.RADIO_BLUETOOTH)) {
    112             Toast.makeText(mContext, R.string.wifi_in_airplane_mode, Toast.LENGTH_SHORT).show();
    113             // Reset switch to off
    114             buttonView.setChecked(false);
    115         }
    116 
    117         if (mLocalAdapter != null) {
    118             mLocalAdapter.setBluetoothEnabled(isChecked);
    119         }
    120         mSwitch.setEnabled(false);
    121     }
    122 
    123     void handleStateChanged(int state) {
    124         switch (state) {
    125             case BluetoothAdapter.STATE_TURNING_ON:
    126                 mSwitch.setEnabled(false);
    127                 break;
    128             case BluetoothAdapter.STATE_ON:
    129                 setChecked(true);
    130                 mSwitch.setEnabled(true);
    131                 break;
    132             case BluetoothAdapter.STATE_TURNING_OFF:
    133                 mSwitch.setEnabled(false);
    134                 break;
    135             case BluetoothAdapter.STATE_OFF:
    136                 setChecked(false);
    137                 mSwitch.setEnabled(true);
    138                 break;
    139             default:
    140                 setChecked(false);
    141                 mSwitch.setEnabled(true);
    142         }
    143     }
    144 
    145     private void setChecked(boolean isChecked) {
    146         if (isChecked != mSwitch.isChecked()) {
    147             // set listener to null, so onCheckedChanged won't be called
    148             // if the checked status on Switch isn't changed by user click
    149             if (mValidListener) {
    150                 mSwitch.setOnCheckedChangeListener(null);
    151             }
    152             mSwitch.setChecked(isChecked);
    153             if (mValidListener) {
    154                 mSwitch.setOnCheckedChangeListener(this);
    155             }
    156         }
    157     }
    158 }
    159