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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.settingslib.bluetooth;
     18 
     19 import android.bluetooth.BluetoothAdapter;
     20 import android.bluetooth.BluetoothDevice;
     21 import android.bluetooth.BluetoothProfile;
     22 import android.bluetooth.le.BluetoothLeScanner;
     23 import android.content.Context;
     24 import android.os.ParcelUuid;
     25 import android.util.Log;
     26 
     27 import java.util.Set;
     28 
     29 /**
     30  * LocalBluetoothAdapter provides an interface between the Settings app
     31  * and the functionality of the local {@link BluetoothAdapter}, specifically
     32  * those related to state transitions of the adapter itself.
     33  *
     34  * <p>Connection and bonding state changes affecting specific devices
     35  * are handled by {@link CachedBluetoothDeviceManager},
     36  * {@link BluetoothEventManager}, and {@link LocalBluetoothProfileManager}.
     37  */
     38 public final class LocalBluetoothAdapter {
     39     private static final String TAG = "LocalBluetoothAdapter";
     40 
     41     /** This class does not allow direct access to the BluetoothAdapter. */
     42     private final BluetoothAdapter mAdapter;
     43 
     44     private LocalBluetoothProfileManager mProfileManager;
     45 
     46     private static LocalBluetoothAdapter sInstance;
     47 
     48     private int mState = BluetoothAdapter.ERROR;
     49 
     50     private static final int SCAN_EXPIRATION_MS = 5 * 60 * 1000; // 5 mins
     51 
     52     private long mLastScan;
     53 
     54     private LocalBluetoothAdapter(BluetoothAdapter adapter) {
     55         mAdapter = adapter;
     56     }
     57 
     58     void setProfileManager(LocalBluetoothProfileManager manager) {
     59         mProfileManager = manager;
     60     }
     61 
     62     /**
     63      * Get the singleton instance of the LocalBluetoothAdapter. If this device
     64      * doesn't support Bluetooth, then null will be returned. Callers must be
     65      * prepared to handle a null return value.
     66      * @return the LocalBluetoothAdapter object, or null if not supported
     67      */
     68     static synchronized LocalBluetoothAdapter getInstance() {
     69         if (sInstance == null) {
     70             BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
     71             if (adapter != null) {
     72                 sInstance = new LocalBluetoothAdapter(adapter);
     73             }
     74         }
     75 
     76         return sInstance;
     77     }
     78 
     79     // Pass-through BluetoothAdapter methods that we can intercept if necessary
     80 
     81     public void cancelDiscovery() {
     82         mAdapter.cancelDiscovery();
     83     }
     84 
     85     public boolean enable() {
     86         return mAdapter.enable();
     87     }
     88 
     89     public boolean disable() {
     90         return mAdapter.disable();
     91     }
     92 
     93     void getProfileProxy(Context context,
     94             BluetoothProfile.ServiceListener listener, int profile) {
     95         mAdapter.getProfileProxy(context, listener, profile);
     96     }
     97 
     98     public Set<BluetoothDevice> getBondedDevices() {
     99         return mAdapter.getBondedDevices();
    100     }
    101 
    102     public String getName() {
    103         return mAdapter.getName();
    104     }
    105 
    106     public int getScanMode() {
    107         return mAdapter.getScanMode();
    108     }
    109 
    110     public BluetoothLeScanner getBluetoothLeScanner() {
    111         return mAdapter.getBluetoothLeScanner();
    112     }
    113 
    114     public int getState() {
    115         return mAdapter.getState();
    116     }
    117 
    118     public ParcelUuid[] getUuids() {
    119         return mAdapter.getUuids();
    120     }
    121 
    122     public boolean isDiscovering() {
    123         return mAdapter.isDiscovering();
    124     }
    125 
    126     public boolean isEnabled() {
    127         return mAdapter.isEnabled();
    128     }
    129 
    130     public int getConnectionState() {
    131         return mAdapter.getConnectionState();
    132     }
    133 
    134     public void setDiscoverableTimeout(int timeout) {
    135         mAdapter.setDiscoverableTimeout(timeout);
    136     }
    137 
    138     public void setName(String name) {
    139         mAdapter.setName(name);
    140     }
    141 
    142     public void setScanMode(int mode) {
    143         mAdapter.setScanMode(mode);
    144     }
    145 
    146     public boolean setScanMode(int mode, int duration) {
    147         return mAdapter.setScanMode(mode, duration);
    148     }
    149 
    150     public void startScanning(boolean force) {
    151         // Only start if we're not already scanning
    152         if (!mAdapter.isDiscovering()) {
    153             if (!force) {
    154                 // Don't scan more than frequently than SCAN_EXPIRATION_MS,
    155                 // unless forced
    156                 if (mLastScan + SCAN_EXPIRATION_MS > System.currentTimeMillis()) {
    157                     return;
    158                 }
    159 
    160                 // If we are playing music, don't scan unless forced.
    161                 A2dpProfile a2dp = mProfileManager.getA2dpProfile();
    162                 if (a2dp != null && a2dp.isA2dpPlaying()) {
    163                     return;
    164                 }
    165                 A2dpSinkProfile a2dpSink = mProfileManager.getA2dpSinkProfile();
    166                 if ((a2dpSink != null) && (a2dpSink.isA2dpPlaying())){
    167                     return;
    168                 }
    169             }
    170 
    171             if (mAdapter.startDiscovery()) {
    172                 mLastScan = System.currentTimeMillis();
    173             }
    174         }
    175     }
    176 
    177     public void stopScanning() {
    178         if (mAdapter.isDiscovering()) {
    179             mAdapter.cancelDiscovery();
    180         }
    181     }
    182 
    183     public synchronized int getBluetoothState() {
    184         // Always sync state, in case it changed while paused
    185         syncBluetoothState();
    186         return mState;
    187     }
    188 
    189     synchronized void setBluetoothStateInt(int state) {
    190         mState = state;
    191 
    192         if (state == BluetoothAdapter.STATE_ON) {
    193             // if mProfileManager hasn't been constructed yet, it will
    194             // get the adapter UUIDs in its constructor when it is.
    195             if (mProfileManager != null) {
    196                 mProfileManager.setBluetoothStateOn();
    197             }
    198         }
    199     }
    200 
    201     // Returns true if the state changed; false otherwise.
    202     boolean syncBluetoothState() {
    203         int currentState = mAdapter.getState();
    204         if (currentState != mState) {
    205             setBluetoothStateInt(mAdapter.getState());
    206             return true;
    207         }
    208         return false;
    209     }
    210 
    211     public boolean setBluetoothEnabled(boolean enabled) {
    212         boolean success = enabled
    213                 ? mAdapter.enable()
    214                 : mAdapter.disable();
    215 
    216         if (success) {
    217             setBluetoothStateInt(enabled
    218                 ? BluetoothAdapter.STATE_TURNING_ON
    219                 : BluetoothAdapter.STATE_TURNING_OFF);
    220         } else {
    221             if (Utils.V) {
    222                 Log.v(TAG, "setBluetoothEnabled call, manager didn't return " +
    223                         "success for enabled: " + enabled);
    224             }
    225 
    226             syncBluetoothState();
    227         }
    228         return success;
    229     }
    230 
    231     public BluetoothDevice getRemoteDevice(String address) {
    232         return mAdapter.getRemoteDevice(address);
    233     }
    234 }
    235