1/*
2 * Copyright (C) 2011 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.bluetooth.BluetoothDevice;
21import android.bluetooth.BluetoothProfile;
22import android.content.Context;
23import android.os.ParcelUuid;
24import android.util.Log;
25
26import java.util.Set;
27
28/**
29 * LocalBluetoothAdapter provides an interface between the Settings app
30 * and the functionality of the local {@link BluetoothAdapter}, specifically
31 * those related to state transitions of the adapter itself.
32 *
33 * <p>Connection and bonding state changes affecting specific devices
34 * are handled by {@link CachedBluetoothDeviceManager},
35 * {@link BluetoothEventManager}, and {@link LocalBluetoothProfileManager}.
36 */
37public final class LocalBluetoothAdapter {
38    private static final String TAG = "LocalBluetoothAdapter";
39
40    /** This class does not allow direct access to the BluetoothAdapter. */
41    private final BluetoothAdapter mAdapter;
42
43    private LocalBluetoothProfileManager mProfileManager;
44
45    private static LocalBluetoothAdapter sInstance;
46
47    private int mState = BluetoothAdapter.ERROR;
48
49    private static final int SCAN_EXPIRATION_MS = 5 * 60 * 1000; // 5 mins
50
51    private long mLastScan;
52
53    private LocalBluetoothAdapter(BluetoothAdapter adapter) {
54        mAdapter = adapter;
55    }
56
57    void setProfileManager(LocalBluetoothProfileManager manager) {
58        mProfileManager = manager;
59    }
60
61    /**
62     * Get the singleton instance of the LocalBluetoothAdapter. If this device
63     * doesn't support Bluetooth, then null will be returned. Callers must be
64     * prepared to handle a null return value.
65     * @return the LocalBluetoothAdapter object, or null if not supported
66     */
67    static synchronized LocalBluetoothAdapter getInstance() {
68        if (sInstance == null) {
69            BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
70            if (adapter != null) {
71                sInstance = new LocalBluetoothAdapter(adapter);
72            }
73        }
74
75        return sInstance;
76    }
77
78    // Pass-through BluetoothAdapter methods that we can intercept if necessary
79
80    void cancelDiscovery() {
81        mAdapter.cancelDiscovery();
82    }
83
84    boolean enable() {
85        return mAdapter.enable();
86    }
87
88    boolean disable() {
89        return mAdapter.disable();
90    }
91
92    void getProfileProxy(Context context,
93            BluetoothProfile.ServiceListener listener, int profile) {
94        mAdapter.getProfileProxy(context, listener, profile);
95    }
96
97    Set<BluetoothDevice> getBondedDevices() {
98        return mAdapter.getBondedDevices();
99    }
100
101    String getName() {
102        return mAdapter.getName();
103    }
104
105    int getScanMode() {
106        return mAdapter.getScanMode();
107    }
108
109    int getState() {
110        return mAdapter.getState();
111    }
112
113    ParcelUuid[] getUuids() {
114        return mAdapter.getUuids();
115    }
116
117    boolean isDiscovering() {
118        return mAdapter.isDiscovering();
119    }
120
121    boolean isEnabled() {
122        return mAdapter.isEnabled();
123    }
124
125    void setDiscoverableTimeout(int timeout) {
126        mAdapter.setDiscoverableTimeout(timeout);
127    }
128
129    void setName(String name) {
130        mAdapter.setName(name);
131    }
132
133    void setScanMode(int mode) {
134        mAdapter.setScanMode(mode);
135    }
136
137    boolean setScanMode(int mode, int duration) {
138        return mAdapter.setScanMode(mode, duration);
139    }
140
141    void startScanning(boolean force) {
142        // Only start if we're not already scanning
143        if (!mAdapter.isDiscovering()) {
144            if (!force) {
145                // Don't scan more than frequently than SCAN_EXPIRATION_MS,
146                // unless forced
147                if (mLastScan + SCAN_EXPIRATION_MS > System.currentTimeMillis()) {
148                    return;
149                }
150
151                // If we are playing music, don't scan unless forced.
152                A2dpProfile a2dp = mProfileManager.getA2dpProfile();
153                if (a2dp != null && a2dp.isA2dpPlaying()) {
154                    return;
155                }
156            }
157
158            if (mAdapter.startDiscovery()) {
159                mLastScan = System.currentTimeMillis();
160            }
161        }
162    }
163
164    void stopScanning() {
165        if (mAdapter.isDiscovering()) {
166            mAdapter.cancelDiscovery();
167        }
168    }
169
170    public synchronized int getBluetoothState() {
171        // Always sync state, in case it changed while paused
172        syncBluetoothState();
173        return mState;
174    }
175
176    synchronized void setBluetoothStateInt(int state) {
177        mState = state;
178
179        if (state == BluetoothAdapter.STATE_ON) {
180            // if mProfileManager hasn't been constructed yet, it will
181            // get the adapter UUIDs in its constructor when it is.
182            if (mProfileManager != null) {
183                mProfileManager.setBluetoothStateOn();
184            }
185        }
186    }
187
188    // Returns true if the state changed; false otherwise.
189    boolean syncBluetoothState() {
190        int currentState = mAdapter.getState();
191        if (currentState != mState) {
192            setBluetoothStateInt(mAdapter.getState());
193            return true;
194        }
195        return false;
196    }
197
198    public void setBluetoothEnabled(boolean enabled) {
199        boolean success = enabled
200                ? mAdapter.enable()
201                : mAdapter.disable();
202
203        if (success) {
204            setBluetoothStateInt(enabled
205                ? BluetoothAdapter.STATE_TURNING_ON
206                : BluetoothAdapter.STATE_TURNING_OFF);
207        } else {
208            if (Utils.V) {
209                Log.v(TAG, "setBluetoothEnabled call, manager didn't return " +
210                        "success for enabled: " + enabled);
211            }
212
213            syncBluetoothState();
214        }
215    }
216}
217