1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.bluetooth;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Message;
import android.util.Log;
import com.android.internal.util.State;
import com.android.internal.util.StateMachine;
/**
* This state machine is used to serialize the connections
* to a particular profile. Currently, we only allow one device
* to be connected to a particular profile.
* States:
* {@link StableState} : No pending commands. Send the
* command to the appropriate remote device specific state machine.
*
* {@link PendingCommandState} : A profile connection / disconnection
* command is being executed. This will result in a profile state
* change. Defer all commands.
* @hide
*/
public class BluetoothProfileState extends StateMachine {
private static final boolean DBG = true;
private static final String TAG = "BluetoothProfileState";
public static final int HFP = 0;
public static final int A2DP = 1;
public static final int HID = 2;
static final int TRANSITION_TO_STABLE = 100;
private int mProfile;
private BluetoothDevice mPendingDevice;
private PendingCommandState mPendingCommandState = new PendingCommandState();
private StableState mStableState = new StableState();
private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device == null) {
return;
}
if (action.equals(BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED)) {
int newState = intent.getIntExtra(BluetoothProfile.EXTRA_STATE, 0);
if (mProfile == HFP && (newState == BluetoothProfile.STATE_CONNECTED ||
newState == BluetoothProfile.STATE_DISCONNECTED)) {
sendMessage(TRANSITION_TO_STABLE);
}
} else if (action.equals(BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED)) {
int newState = intent.getIntExtra(BluetoothProfile.EXTRA_STATE, 0);
if (mProfile == A2DP && (newState == BluetoothProfile.STATE_CONNECTED ||
newState == BluetoothProfile.STATE_DISCONNECTED)) {
sendMessage(TRANSITION_TO_STABLE);
}
} else if (action.equals(BluetoothInputDevice.ACTION_CONNECTION_STATE_CHANGED)) {
int newState = intent.getIntExtra(BluetoothProfile.EXTRA_STATE, 0);
if (mProfile == HID && (newState == BluetoothProfile.STATE_CONNECTED ||
newState == BluetoothProfile.STATE_DISCONNECTED)) {
sendMessage(TRANSITION_TO_STABLE);
}
} else if (action.equals(BluetoothDevice.ACTION_ACL_DISCONNECTED)) {
if (device.equals(mPendingDevice)) {
sendMessage(TRANSITION_TO_STABLE);
}
}
}
};
public BluetoothProfileState(Context context, int profile) {
super("BluetoothProfileState:" + profile);
mProfile = profile;
addState(mStableState);
addState(mPendingCommandState);
setInitialState(mStableState);
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED);
filter.addAction(BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED);
filter.addAction(BluetoothInputDevice.ACTION_CONNECTION_STATE_CHANGED);
filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
context.registerReceiver(mBroadcastReceiver, filter);
}
private class StableState extends State {
@Override
public void enter() {
log("Entering Stable State");
mPendingDevice = null;
}
@Override
public boolean processMessage(Message msg) {
if (msg.what != TRANSITION_TO_STABLE) {
transitionTo(mPendingCommandState);
}
return true;
}
}
private class PendingCommandState extends State {
@Override
public void enter() {
log("Entering PendingCommandState State");
dispatchMessage(getCurrentMessage());
}
@Override
public boolean processMessage(Message msg) {
if (msg.what == TRANSITION_TO_STABLE) {
transitionTo(mStableState);
} else {
dispatchMessage(msg);
}
return true;
}
private void dispatchMessage(Message msg) {
BluetoothDeviceProfileState deviceProfileMgr =
(BluetoothDeviceProfileState)msg.obj;
int cmd = msg.arg1;
if (mPendingDevice == null || mPendingDevice.equals(deviceProfileMgr.getDevice())) {
mPendingDevice = deviceProfileMgr.getDevice();
deviceProfileMgr.sendMessage(cmd);
} else {
Message deferMsg = new Message();
deferMsg.arg1 = cmd;
deferMsg.obj = deviceProfileMgr;
deferMessage(deferMsg);
}
}
}
private void log(String message) {
if (DBG) {
Log.i(TAG, "Message:" + message);
}
}
}
|
