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      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 
     17 package com.android.settings.bluetooth;
     18 
     19 import android.bluetooth.BluetoothAdapter;
     20 import android.bluetooth.BluetoothDevice;
     21 import android.bluetooth.BluetoothProfile;
     22 import android.content.Context;
     23 import android.os.ParcelUuid;
     24 import android.util.Log;
     25 
     26 import 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  */
     37 public 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