BluetoothEnabler.java revision 9d1bfd1e8de6e46137a9571507c03526880d6a46 
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
17package com.android.settings.bluetooth;
18
19import android.bluetooth.BluetoothAdapter;
20import android.content.BroadcastReceiver;
21import android.content.Context;
22import android.content.Intent;
23import android.content.IntentFilter;
24import android.os.Handler;
25import android.os.Message;
26import android.provider.Settings;
27import android.widget.Switch;
28import android.widget.Toast;
29
30import com.android.internal.logging.MetricsLogger;
31import com.android.internal.logging.MetricsProto.MetricsEvent;
32import com.android.settings.R;
33import com.android.settings.search.Index;
34import com.android.settings.widget.SwitchBar;
35import com.android.settingslib.WirelessUtils;
36import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
37import com.android.settingslib.bluetooth.LocalBluetoothManager;
38
39/**
40 * BluetoothEnabler is a helper to manage the Bluetooth on/off checkbox
41 * preference. It turns on/off Bluetooth and ensures the summary of the
42 * preference reflects the current state.
43 */
44public final class BluetoothEnabler implements SwitchBar.OnSwitchChangeListener {
45    private Context mContext;
46    private Switch mSwitch;
47    private SwitchBar mSwitchBar;
48    private boolean mValidListener;
49    private final LocalBluetoothAdapter mLocalAdapter;
50    private final IntentFilter mIntentFilter;
51
52    private static final String EVENT_DATA_IS_BT_ON = "is_bluetooth_on";
53    private static final int EVENT_UPDATE_INDEX = 0;
54
55    private Handler mHandler = new Handler() {
56        @Override
57        public void handleMessage(Message msg) {
58            switch (msg.what) {
59                case EVENT_UPDATE_INDEX:
60                    final boolean isBluetoothOn = msg.getData().getBoolean(EVENT_DATA_IS_BT_ON);
61                    Index.getInstance(mContext).updateFromClassNameResource(
62                            BluetoothSettings.class.getName(), true, isBluetoothOn);
63                    break;
64            }
65        }
66    };
67
68    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
69        @Override
70        public void onReceive(Context context, Intent intent) {
71            // Broadcast receiver is always running on the UI thread here,
72            // so we don't need consider thread synchronization.
73            int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
74            handleStateChanged(state);
75        }
76    };
77
78    public BluetoothEnabler(Context context, SwitchBar switchBar) {
79        mContext = context;
80        mSwitchBar = switchBar;
81        mSwitch = switchBar.getSwitch();
82        mValidListener = false;
83
84        LocalBluetoothManager manager = Utils.getLocalBtManager(context);
85        if (manager == null) {
86            // Bluetooth is not supported
87            mLocalAdapter = null;
88            mSwitch.setEnabled(false);
89        } else {
90            mLocalAdapter = manager.getBluetoothAdapter();
91        }
92        mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
93    }
94
95    public void setupSwitchBar() {
96        mSwitchBar.show();
97    }
98
99    public void teardownSwitchBar() {
100        mSwitchBar.hide();
101    }
102
103    public void resume(Context context) {
104        if (mLocalAdapter == null) {
105            mSwitch.setEnabled(false);
106            return;
107        }
108
109        if (mContext != context) {
110            mContext = context;
111        }
112
113        // Bluetooth state is not sticky, so set it manually
114        handleStateChanged(mLocalAdapter.getBluetoothState());
115
116        mSwitchBar.addOnSwitchChangeListener(this);
117        mContext.registerReceiver(mReceiver, mIntentFilter);
118        mValidListener = true;
119    }
120
121    public void pause() {
122        if (mLocalAdapter == null) {
123            return;
124        }
125
126        mSwitchBar.removeOnSwitchChangeListener(this);
127        mContext.unregisterReceiver(mReceiver);
128        mValidListener = false;
129    }
130
131    void handleStateChanged(int state) {
132        switch (state) {
133            case BluetoothAdapter.STATE_TURNING_ON:
134                mSwitch.setEnabled(false);
135                break;
136            case BluetoothAdapter.STATE_ON:
137                setChecked(true);
138                mSwitch.setEnabled(true);
139                updateSearchIndex(true);
140                break;
141            case BluetoothAdapter.STATE_TURNING_OFF:
142                mSwitch.setEnabled(false);
143                break;
144            case BluetoothAdapter.STATE_OFF:
145                setChecked(false);
146                mSwitch.setEnabled(true);
147                updateSearchIndex(false);
148                break;
149            default:
150                setChecked(false);
151                mSwitch.setEnabled(true);
152                updateSearchIndex(false);
153        }
154    }
155
156    private void setChecked(boolean isChecked) {
157        if (isChecked != mSwitch.isChecked()) {
158            // set listener to null, so onCheckedChanged won't be called
159            // if the checked status on Switch isn't changed by user click
160            if (mValidListener) {
161                mSwitchBar.removeOnSwitchChangeListener(this);
162            }
163            mSwitch.setChecked(isChecked);
164            if (mValidListener) {
165                mSwitchBar.addOnSwitchChangeListener(this);
166            }
167        }
168    }
169
170    private void updateSearchIndex(boolean isBluetoothOn) {
171        mHandler.removeMessages(EVENT_UPDATE_INDEX);
172
173        Message msg = new Message();
174        msg.what = EVENT_UPDATE_INDEX;
175        msg.getData().putBoolean(EVENT_DATA_IS_BT_ON, isBluetoothOn);
176        mHandler.sendMessage(msg);
177    }
178
179    @Override
180    public void onSwitchChanged(Switch switchView, boolean isChecked) {
181        // Show toast message if Bluetooth is not allowed in airplane mode
182        if (isChecked &&
183                !WirelessUtils.isRadioAllowed(mContext, Settings.Global.RADIO_BLUETOOTH)) {
184            Toast.makeText(mContext, R.string.wifi_in_airplane_mode, Toast.LENGTH_SHORT).show();
185            // Reset switch to off
186            switchView.setChecked(false);
187        }
188
189        MetricsLogger.action(mContext, MetricsEvent.ACTION_BLUETOOTH_TOGGLE, isChecked);
190
191        if (mLocalAdapter != null) {
192            mLocalAdapter.setBluetoothEnabled(isChecked);
193        }
194        mSwitch.setEnabled(false);
195    }
196}
197