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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 com.android.settings.R;
     20 import com.android.settings.WirelessSettings;
     21 
     22 import android.bluetooth.BluetoothAdapter;
     23 import android.content.BroadcastReceiver;
     24 import android.content.Context;
     25 import android.content.Intent;
     26 import android.content.IntentFilter;
     27 import android.preference.Preference;
     28 import android.preference.CheckBoxPreference;
     29 import android.provider.Settings;
     30 import android.text.TextUtils;
     31 import android.widget.Toast;
     32 
     33 /**
     34  * BluetoothEnabler is a helper to manage the Bluetooth on/off checkbox
     35  * preference. It is turns on/off Bluetooth and ensures the summary of the
     36  * preference reflects the current state.
     37  */
     38 public class BluetoothEnabler implements Preference.OnPreferenceChangeListener {
     39     private final Context mContext;
     40     private final CheckBoxPreference mCheckBox;
     41     private final CharSequence mOriginalSummary;
     42 
     43     private final LocalBluetoothManager mLocalManager;
     44     private final IntentFilter mIntentFilter;
     45     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     46         @Override
     47         public void onReceive(Context context, Intent intent) {
     48             int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
     49             handleStateChanged(state);
     50         }
     51     };
     52 
     53     public BluetoothEnabler(Context context, CheckBoxPreference checkBox) {
     54         mContext = context;
     55         mCheckBox = checkBox;
     56         mOriginalSummary = checkBox.getSummary();
     57         checkBox.setPersistent(false);
     58 
     59         mLocalManager = LocalBluetoothManager.getInstance(context);
     60         if (mLocalManager == null) {
     61             // Bluetooth is not supported
     62             checkBox.setEnabled(false);
     63         }
     64         mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
     65     }
     66 
     67     public void resume() {
     68         if (mLocalManager == null) {
     69             return;
     70         }
     71 
     72         // Bluetooth state is not sticky, so set it manually
     73         handleStateChanged(mLocalManager.getBluetoothState());
     74 
     75         mContext.registerReceiver(mReceiver, mIntentFilter);
     76         mCheckBox.setOnPreferenceChangeListener(this);
     77     }
     78 
     79     public void pause() {
     80         if (mLocalManager == null) {
     81             return;
     82         }
     83 
     84         mContext.unregisterReceiver(mReceiver);
     85         mCheckBox.setOnPreferenceChangeListener(null);
     86     }
     87 
     88     public boolean onPreferenceChange(Preference preference, Object value) {
     89         boolean enable = (Boolean) value;
     90 
     91         // Show toast message if Bluetooth is not allowed in airplane mode
     92         if (enable && !WirelessSettings
     93                 .isRadioAllowed(mContext, Settings.System.RADIO_BLUETOOTH)) {
     94             Toast.makeText(mContext, R.string.wifi_in_airplane_mode,
     95                     Toast.LENGTH_SHORT).show();
     96             return false;
     97         }
     98 
     99         mLocalManager.setBluetoothEnabled(enable);
    100         mCheckBox.setEnabled(false);
    101 
    102         // Don't update UI to opposite state until we're sure
    103         return false;
    104     }
    105 
    106     private void handleStateChanged(int state) {
    107         switch (state) {
    108             case BluetoothAdapter.STATE_TURNING_ON:
    109                 mCheckBox.setSummary(R.string.wifi_starting);
    110                 mCheckBox.setEnabled(false);
    111                 break;
    112             case BluetoothAdapter.STATE_ON:
    113                 mCheckBox.setChecked(true);
    114                 mCheckBox.setSummary(null);
    115                 mCheckBox.setEnabled(true);
    116                 break;
    117             case BluetoothAdapter.STATE_TURNING_OFF:
    118                 mCheckBox.setSummary(R.string.wifi_stopping);
    119                 mCheckBox.setEnabled(false);
    120                 break;
    121             case BluetoothAdapter.STATE_OFF:
    122                 mCheckBox.setChecked(false);
    123                 mCheckBox.setSummary(mOriginalSummary);
    124                 mCheckBox.setEnabled(true);
    125                 break;
    126             default:
    127                 mCheckBox.setChecked(false);
    128                 mCheckBox.setSummary(R.string.wifi_error);
    129                 mCheckBox.setEnabled(true);
    130         }
    131     }
    132 }
    133